Verwendung von IronBarcode zur Erstellung einer C#-Scanner-API

Die Herausforderung des Unternehmens-Barcodes

Stellen Sie sich vor, Sie wären Enterprise Architect bei einem Fortune-500-Logistikunternehmen. Ihre Lagerteams haben mit beschädigten Versandetiketten zu kämpfen, Ihre Finanzabteilung muss Tausende von Rechnungs-PDFs mit eingebetteten Barcodes verarbeiten, und Ihr IT-Sicherheitsteam verlangt eine Lösung, die die SOC2-Konformität erfüllt, ohne Hardwareabhängigkeiten in Ihrer globalen Infrastruktur einzuführen.

Dieses Szenario führte dazu, dass einer unserer Unternehmenskunden die REST-API-Funktionen von IronBarcode entdeckte. Was als einfache Anforderung zum Lesen von Barcodes begann, entwickelte sich zu einer kompletten Scanlösung, die mittlerweile monatlich über 2 Millionen Barcodes im gesamten Unternehmen verarbeitet.

Traditionell hätte dies teure Hardware-Scanner an jedem Standort, ein komplexes Treibermanagement und umfangreiche Sicherheitsüberprüfungen erfordert. Stattdessen entwickelten sie eine zentrale RESTful-API, auf die jede Abteilung sicher zugreifen konnte, sei es zum Scannen beschädigter Lageretiketten oder zum Extrahieren von Rechnungsdaten aus Lieferanten-PDFs.

Dieses Tutorial führt Sie durch den Prozess des Erstellens einer solchen professionellen Barcode-Scanner-API. Sie lernen, wie Sie sichere Endpunkte erstellen, die Herausforderungen aus der Praxis wie zerrissene Etiketten, verzerrte Bilder und mehrseitige Dokumente bewältigen. Noch wichtiger ist jedoch, dass Sie sehen werden, wie Sie dies mit der Sicherheit, Skalierbarkeit und Herstellerstabilität umsetzen können, die Unternehmensumgebungen erfordern.

Entwicklung einer zuverlässigen C#-Scanner-API

Die Entwicklung einer API für Barcode-Scanner in Unternehmen erfordert die frühzeitige Klärung mehrerer kritischer Punkte. Sicherheitsteams benötigen Gewissheit über den Umgang mit Daten. Compliance-Beauftragte benötigen Prüfprotokolle. Betriebsteams benötigen Zuverlässigkeit über verschiedene Plattformen hinweg. Die vollständige Dokumentation von IronBarcode geht systematisch auf jedes dieser Probleme ein.

Die Schönheit des RESTful-Ansatzes liegt in seiner Einfachheit und Sicherheit. Durch die Zentralisierung der Barcode-Verarbeitung hinter sicheren API-Endpunkten behalten Sie die vollständige Kontrolle über den Datenfluss. Kein Clientgerät benötigt direkten Zugriff auf Ihre Barcode-Verarbeitungslogik. Diese Architektur unterstützt auf natürliche Weise Ihr Zero-Trust-Sicherheitsmodell und ermöglicht gleichzeitig eine reibungslose Integration in bestehende Unternehmenssysteme.

Beginnen wir mit den Grundlagen. Die Lesefunktionen von IronBarcode unterstützen alle gängigen Barcode-Formate, die in Ihrem Unternehmen vorkommen können. Von traditionellen Code-39-Barcodes , die in der Fertigung verwendet werden, bis hin zu modernen QR-Codes in Marketingkampagnen – die Bibliothek kann sie alle verarbeiten. Der Leitfaden zu den unterstützten Barcode-Formaten bietet eine vollständige Referenz für die Planung Ihrer Implementierung.

Besonders wertvoll für Unternehmensszenarien sind die Fehlertoleranzfähigkeiten der Bibliothek. Barcodes in der realen Welt sind nicht perfekt. Sie werden beschädigt, schlecht gedruckt oder schief eingescannt. Die fortschrittliche Bildverarbeitung von IronBarcode bewältigt diese Herausforderungen automatisch, wodurch Supportanfragen reduziert und die betriebliche Effizienz verbessert werden.

Installation und Einrichtung von IronBarcode

Bei der Implementierung in Unternehmen ist eine sorgfältige Berücksichtigung von Abhängigkeiten und Lizenzbestimmungen erforderlich. IronBarcode vereinfacht dies durch eine unkomplizierte NuGet-Installation und transparente Lizenzierung. So starten Sie Ihr ASP.NET Core-Projekt:

Install-Package IronBarCode

Install-Package IronBarCode

Für Unternehmensumgebungen mit spezifischen Plattformanforderungen konsultieren Sie bitte den erweiterten NuGet-Installationsleitfaden . Dies umfasst Szenarien wie die Ausrichtung auf bestimmte .NET-Versionen oder die Optimierung für bestimmte Plattformen.

Nach der Installation sollten Sie Ihre Einrichtung mit einem einfachen Test überprüfen. Dieser Code demonstriert die Fähigkeit der Bibliothek, Barcodes mit minimaler Konfiguration zu lesen:

using IronBarCode;

// Verify installation with a basic barcode read
public class InstallationTest
{
    public static void VerifySetup()
    {
        try
        {
            // Test with a sample barcode image
            var result = BarcodeReader.Read("test-barcode.png");

            if (result.Any())
            {
                Console.WriteLine($"Success! Detected: {result.First().Value}");
                Console.WriteLine($"Format: {result.First().BarcodeType}");
                Console.WriteLine($"Confidence: {result.First().Confidence}%");
            }
            else
            {
                Console.WriteLine("No barcode detected in test image");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Setup issue: {ex.Message}");
        }
    }
}

using IronBarCode;

// Verify installation with a basic barcode read
public class InstallationTest
{
    public static void VerifySetup()
    {
        try
        {
            // Test with a sample barcode image
            var result = BarcodeReader.Read("test-barcode.png");

            if (result.Any())
            {
                Console.WriteLine($"Success! Detected: {result.First().Value}");
                Console.WriteLine($"Format: {result.First().BarcodeType}");
                Console.WriteLine($"Confidence: {result.First().Confidence}%");
            }
            else
            {
                Console.WriteLine("No barcode detected in test image");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Setup issue: {ex.Message}");
        }
    }
}

Dieser Verifizierungsschritt ist für Unternehmensimplementierungen von entscheidender Bedeutung. Es bestätigt, dass die Bibliothek ordnungsgemäß installiert und lizenziert ist und auf die notwendigen Systemressourcen zugreifen kann. Die Auswertung des Konfidenzwertes hilft dabei, Basiserwartungen für Ihre spezifischen Barcode-Typen festzulegen.

Bei Produktionsumgebungen sollten Sie die Lizenzdokumentation sorgfältig prüfen. Enterprise-Lizenzen unterstützen unbegrenzte Bereitstellungen innerhalb Ihrer Organisation, was für die Skalierung über mehrere Rechenzentren hinweg von entscheidender Bedeutung ist. Der Leitfaden zur Lizenzschlüsselkonfiguration erläutert verschiedene Aktivierungsmethoden, einschließlich Umgebungsvariablen und Konfigurationsdateien, die auf Ihre DevOps Praktiken abgestimmt sind.

Erstellung eines vollständigen Scanner-API-Controllers

Lasst uns eine produktionsreife Scanner-API entwickeln, die auf die realen Bedürfnisse von Unternehmen eingeht. Diese Implementierung umfasst eine angemessene Fehlerbehandlung, Sicherheitsaspekte und Leistungsoptimierungen:

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using IronBarCode;
using System.Drawing;
using System.ComponentModel.DataAnnotations;

namespace BarcodeScannerAPI.Controllers
{
    [ApiController]
    [Route("api/v1/[controller]")]
    [Authorize] // Require authentication for all endpoints
    public class ScannerController : ControllerBase
    {
        private readonly ILogger<ScannerController> _logger;
        private readonly IConfiguration _configuration;

        public ScannerController(ILogger<ScannerController> logger, IConfiguration configuration)
        {
            _logger = logger;
            _configuration = configuration;
        }

        // Enhanced result model with audit fields
        public class ScanResult
        {
            public bool Success { get; set; }
            public List<BarcodeData> Barcodes { get; set; } = new List<BarcodeData>();
            public string RequestId { get; set; } = Guid.NewGuid().ToString();
            public DateTime ProcessedAt { get; set; } = DateTime.UtcNow;
            public long ProcessingTimeMs { get; set; }
            public string ErrorMessage { get; set; }
            public Dictionary<string, object> Metadata { get; set; } = new Dictionary<string, object>();
        }

        public class BarcodeData
        {
            public string Value { get; set; }
            public string Format { get; set; }
            public double Confidence { get; set; }
            public Rectangle Location { get; set; }
            public int PageNumber { get; set; } // For PDF processing
        }

        // Input validation model
        public class ScanRequest
        {
            [Required]
            public IFormFile File { get; set; }

            [Range(1, 10)]
            public int MaxBarcodes { get; set; } = 5;

            public string[] ExpectedFormats { get; set; }

            public bool EnableImageCorrection { get; set; } = true;
        }

        [HttpPost("scan")]
        [RequestSizeLimit(52428800)] // 50MB limit
        public async Task<ActionResult<ScanResult>> ScanDocument([FromForm] ScanRequest request)
        {
            var stopwatch = System.Diagnostics.Stopwatch.StartNew();
            var result = new ScanResult();

            try
            {
                // Validate file type for security
                var allowedExtensions = new[] { ".pdf", ".png", ".jpg", ".jpeg", ".gif", ".tiff", ".bmp" };
                var fileExtension = Path.GetExtension(request.File.FileName).ToLowerInvariant();

                if (!allowedExtensions.Contains(fileExtension))
                {
                    _logger.LogWarning($"Rejected file type: {fileExtension}");
                    return BadRequest(new ScanResult
                    {
                        Success = false,
                        ErrorMessage = "Unsupported file type. Allowed: PDF, PNG, JPG, GIF, TIFF, BMP"
                    });
                }

                // Process the file
                using var stream = new MemoryStream();
                await request.File.CopyToAsync(stream);
                var fileBytes = stream.ToArray();

                // Log for audit trail
                _logger.LogInformation($"Processing {request.File.FileName} ({fileBytes.Length} bytes) - RequestId: {result.RequestId}");

                // Configure scanner based on requirements
                var options = ConfigureOptions(request);

                // Handle different file types
                BarcodeResults scanResults;
                if (fileExtension == ".pdf")
                {
                    var pdfOptions = new PdfBarcodeReaderOptions
                    {
                        Scale = 3,
                        DPI = 300,
                        MaxThreads = 4
                    };
                    scanResults = BarcodeReader.ReadPdf(fileBytes, pdfOptions);
                }
                else
                {
                    scanResults = BarcodeReader.Read(fileBytes, options);
                }

                // Process results
                if (scanResults.Any())
                {
                    result.Success = true;
                    foreach (var barcode in scanResults.Take(request.MaxBarcodes))
                    {
                        result.Barcodes.Add(new BarcodeData
                        {
                            Value = barcode.Value,
                            Format = barcode.BarcodeType.ToString(),
                            Confidence = barcode.Confidence,
                            Location = barcode.Bounds,
                            PageNumber = barcode.PageNumber
                        });
                    }

                    result.Metadata["TotalFound"] = scanResults.Count();
                    result.Metadata["FileSize"] = fileBytes.Length;
                    result.Metadata["FileName"] = request.File.FileName;

                    _logger.LogInformation($"Successfully scanned {scanResults.Count()} barcodes - RequestId: {result.RequestId}");
                }
                else
                {
                    result.Success = false;
                    result.ErrorMessage = "No barcodes detected in the document";
                    _logger.LogWarning($"No barcodes found - RequestId: {result.RequestId}");
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Scanning error - RequestId: {result.RequestId}");
                result.Success = false;
                result.ErrorMessage = "An error occurred during processing";

                // Don't expose internal errors to clients
                if (_configuration.GetValue<bool>("DetailedErrors"))
                {
                    result.Metadata["Exception"] = ex.Message;
                }
            }
            finally
            {
                stopwatch.Stop();
                result.ProcessingTimeMs = stopwatch.ElapsedMilliseconds;
            }

            return result;
        }

        private BarcodeReaderOptions ConfigureOptions(ScanRequest request)
        {
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                ExpectMultipleBarcodes = request.MaxBarcodes > 1,
                RemoveFalsePositive = true,
                Multithreaded = true,
                MaxParallelThreads = Environment.ProcessorCount
            };

            // Apply format filtering if specified
            if (request.ExpectedFormats?.Any() == true)
            {
                var formats = BarcodeEncoding.None;
                foreach (var format in request.ExpectedFormats)
                {
                    if (Enum.TryParse<BarcodeEncoding>(format, true, out var encoding))
                    {
                        formats |= encoding;
                    }
                }
                options.ExpectBarcodeTypes = formats;
            }

            // Enable image correction for damaged barcodes
            if (request.EnableImageCorrection)
            {
                options.ImageFilters = new ImageFilterCollection
                {
                    new SharpenFilter(2),
                    new ContrastFilter(1.5f),
                    new BrightnessFilter(1.1f)
                };
                options.AutoRotate = true;
            }

            return options;
        }

        // Batch processing endpoint for high-volume scenarios
        [HttpPost("scan-batch")]
        [RequestSizeLimit(524288000)] // 500MB for batch operations
        public async Task<ActionResult<List<ScanResult>>> ScanBatch(List<IFormFile> files)
        {
            if (files == null || !files.Any())
            {
                return BadRequest("No files provided");
            }

            if (files.Count > 50)
            {
                return BadRequest("Maximum 50 files per batch");
            }

            var tasks = files.Select(file => ProcessFileAsync(file));
            var results = await Task.WhenAll(tasks);

            _logger.LogInformation($"Batch processed {files.Count} files, {results.Count(r => r.Success)} successful");

            return Ok(results);
        }

        private async Task<ScanResult> ProcessFileAsync(IFormFile file)
        {
            // Reuse the scanning logic
            var request = new ScanRequest 
            { 
                File = file,
                EnableImageCorrection = true 
            };
            var actionResult = await ScanDocument(request);

            if (actionResult.Result is OkObjectResult okResult)
            {
                return okResult.Value as ScanResult;
            }
            else if (actionResult.Result is BadRequestObjectResult badResult)
            {
                return badResult.Value as ScanResult;
            }

            return new ScanResult 
            { 
                Success = false, 
                ErrorMessage = "Processing failed" 
            };
        }
    }
}

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using IronBarCode;
using System.Drawing;
using System.ComponentModel.DataAnnotations;

namespace BarcodeScannerAPI.Controllers
{
    [ApiController]
    [Route("api/v1/[controller]")]
    [Authorize] // Require authentication for all endpoints
    public class ScannerController : ControllerBase
    {
        private readonly ILogger<ScannerController> _logger;
        private readonly IConfiguration _configuration;

        public ScannerController(ILogger<ScannerController> logger, IConfiguration configuration)
        {
            _logger = logger;
            _configuration = configuration;
        }

        // Enhanced result model with audit fields
        public class ScanResult
        {
            public bool Success { get; set; }
            public List<BarcodeData> Barcodes { get; set; } = new List<BarcodeData>();
            public string RequestId { get; set; } = Guid.NewGuid().ToString();
            public DateTime ProcessedAt { get; set; } = DateTime.UtcNow;
            public long ProcessingTimeMs { get; set; }
            public string ErrorMessage { get; set; }
            public Dictionary<string, object> Metadata { get; set; } = new Dictionary<string, object>();
        }

        public class BarcodeData
        {
            public string Value { get; set; }
            public string Format { get; set; }
            public double Confidence { get; set; }
            public Rectangle Location { get; set; }
            public int PageNumber { get; set; } // For PDF processing
        }

        // Input validation model
        public class ScanRequest
        {
            [Required]
            public IFormFile File { get; set; }

            [Range(1, 10)]
            public int MaxBarcodes { get; set; } = 5;

            public string[] ExpectedFormats { get; set; }

            public bool EnableImageCorrection { get; set; } = true;
        }

        [HttpPost("scan")]
        [RequestSizeLimit(52428800)] // 50MB limit
        public async Task<ActionResult<ScanResult>> ScanDocument([FromForm] ScanRequest request)
        {
            var stopwatch = System.Diagnostics.Stopwatch.StartNew();
            var result = new ScanResult();

            try
            {
                // Validate file type for security
                var allowedExtensions = new[] { ".pdf", ".png", ".jpg", ".jpeg", ".gif", ".tiff", ".bmp" };
                var fileExtension = Path.GetExtension(request.File.FileName).ToLowerInvariant();

                if (!allowedExtensions.Contains(fileExtension))
                {
                    _logger.LogWarning($"Rejected file type: {fileExtension}");
                    return BadRequest(new ScanResult
                    {
                        Success = false,
                        ErrorMessage = "Unsupported file type. Allowed: PDF, PNG, JPG, GIF, TIFF, BMP"
                    });
                }

                // Process the file
                using var stream = new MemoryStream();
                await request.File.CopyToAsync(stream);
                var fileBytes = stream.ToArray();

                // Log for audit trail
                _logger.LogInformation($"Processing {request.File.FileName} ({fileBytes.Length} bytes) - RequestId: {result.RequestId}");

                // Configure scanner based on requirements
                var options = ConfigureOptions(request);

                // Handle different file types
                BarcodeResults scanResults;
                if (fileExtension == ".pdf")
                {
                    var pdfOptions = new PdfBarcodeReaderOptions
                    {
                        Scale = 3,
                        DPI = 300,
                        MaxThreads = 4
                    };
                    scanResults = BarcodeReader.ReadPdf(fileBytes, pdfOptions);
                }
                else
                {
                    scanResults = BarcodeReader.Read(fileBytes, options);
                }

                // Process results
                if (scanResults.Any())
                {
                    result.Success = true;
                    foreach (var barcode in scanResults.Take(request.MaxBarcodes))
                    {
                        result.Barcodes.Add(new BarcodeData
                        {
                            Value = barcode.Value,
                            Format = barcode.BarcodeType.ToString(),
                            Confidence = barcode.Confidence,
                            Location = barcode.Bounds,
                            PageNumber = barcode.PageNumber
                        });
                    }

                    result.Metadata["TotalFound"] = scanResults.Count();
                    result.Metadata["FileSize"] = fileBytes.Length;
                    result.Metadata["FileName"] = request.File.FileName;

                    _logger.LogInformation($"Successfully scanned {scanResults.Count()} barcodes - RequestId: {result.RequestId}");
                }
                else
                {
                    result.Success = false;
                    result.ErrorMessage = "No barcodes detected in the document";
                    _logger.LogWarning($"No barcodes found - RequestId: {result.RequestId}");
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Scanning error - RequestId: {result.RequestId}");
                result.Success = false;
                result.ErrorMessage = "An error occurred during processing";

                // Don't expose internal errors to clients
                if (_configuration.GetValue<bool>("DetailedErrors"))
                {
                    result.Metadata["Exception"] = ex.Message;
                }
            }
            finally
            {
                stopwatch.Stop();
                result.ProcessingTimeMs = stopwatch.ElapsedMilliseconds;
            }

            return result;
        }

        private BarcodeReaderOptions ConfigureOptions(ScanRequest request)
        {
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                ExpectMultipleBarcodes = request.MaxBarcodes > 1,
                RemoveFalsePositive = true,
                Multithreaded = true,
                MaxParallelThreads = Environment.ProcessorCount
            };

            // Apply format filtering if specified
            if (request.ExpectedFormats?.Any() == true)
            {
                var formats = BarcodeEncoding.None;
                foreach (var format in request.ExpectedFormats)
                {
                    if (Enum.TryParse<BarcodeEncoding>(format, true, out var encoding))
                    {
                        formats |= encoding;
                    }
                }
                options.ExpectBarcodeTypes = formats;
            }

            // Enable image correction for damaged barcodes
            if (request.EnableImageCorrection)
            {
                options.ImageFilters = new ImageFilterCollection
                {
                    new SharpenFilter(2),
                    new ContrastFilter(1.5f),
                    new BrightnessFilter(1.1f)
                };
                options.AutoRotate = true;
            }

            return options;
        }

        // Batch processing endpoint for high-volume scenarios
        [HttpPost("scan-batch")]
        [RequestSizeLimit(524288000)] // 500MB for batch operations
        public async Task<ActionResult<List<ScanResult>>> ScanBatch(List<IFormFile> files)
        {
            if (files == null || !files.Any())
            {
                return BadRequest("No files provided");
            }

            if (files.Count > 50)
            {
                return BadRequest("Maximum 50 files per batch");
            }

            var tasks = files.Select(file => ProcessFileAsync(file));
            var results = await Task.WhenAll(tasks);

            _logger.LogInformation($"Batch processed {files.Count} files, {results.Count(r => r.Success)} successful");

            return Ok(results);
        }

        private async Task<ScanResult> ProcessFileAsync(IFormFile file)
        {
            // Reuse the scanning logic
            var request = new ScanRequest 
            { 
                File = file,
                EnableImageCorrection = true 
            };
            var actionResult = await ScanDocument(request);

            if (actionResult.Result is OkObjectResult okResult)
            {
                return okResult.Value as ScanResult;
            }
            else if (actionResult.Result is BadRequestObjectResult badResult)
            {
                return badResult.Value as ScanResult;
            }

            return new ScanResult 
            { 
                Success = false, 
                ErrorMessage = "Processing failed" 
            };
        }
    }
}

Diese professionelle Implementierung umfasst mehrere kritische Funktionen, die für den Produktiveinsatz erforderlich sind. Die Authentifizierung stellt sicher, dass nur autorisierte Benutzer auf den Scan-Dienst zugreifen können. Beschränkungen der Anfragegröße verhindern Denial-of-Service-Angriffe. Eine vollständige Protokollierung liefert den von Compliance-Teams benötigten Prüfpfad.

Das strukturierte Antwortmodell liefert nicht nur Barcode-Werte, sondern auch Konfidenzwerte und Standortdaten. Diese Metadaten erweisen sich für die Qualitätssicherungsprozesse als unschätzbar wertvoll. Wenn beim Scannen eines Barcodes eines Lieferanten die Zuverlässigkeit gering ist, kann Ihr System diesen zur manuellen Überprüfung kennzeichnen.

Umgang mit verschiedenen Eingabequellen

Unternehmenssysteme standardisieren sich selten auf ein einziges Format. Ihre Scanner-API muss alles verarbeiten können, von hochauflösenden Lagerkameras bis hin zu minderwertigen PDF-Scans von jahrzehntealten Faxgeräten. So erreichen Sie diese Flexibilität:

// Extended controller with multiple input handlers
[ApiController]
[Route("api/v1/[controller]")]
[Authorize]
public class AdvancedScannerController : ControllerBase
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly ILogger<AdvancedScannerController> _logger;

    public AdvancedScannerController(
        IHttpClientFactory httpClientFactory, 
        ILogger<AdvancedScannerController> logger)
    {
        _httpClientFactory = httpClientFactory;
        _logger = logger;
    }

    // Handle Base64 input (common in web applications)
    [HttpPost("scan-base64")]
    public ActionResult<ScanResult> ScanBase64([FromBody] Base64Request request)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        try
        {
            // Validate Base64 format
            var base64Data = request.ImageData;
            if (base64Data.Contains(","))
            {
                // Handle data URL format: "data:image/png;base64,..."
                base64Data = base64Data.Substring(base64Data.IndexOf(",") + 1);
            }

            var imageBytes = Convert.FromBase64String(base64Data);

            // Implement size validation
            if (imageBytes.Length > 10 * 1024 * 1024) // 10MB limit
            {
                return BadRequest(new ScanResult
                {
                    Success = false,
                    ErrorMessage = "Image size exceeds 10MB limit"
                });
            }

            // Configure for web-uploaded images (often lower quality)
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Detailed,
                ImageFilters = new ImageFilterCollection
                {
                    new SharpenFilter(3),
                    new ContrastFilter(2),
                    new DeNoise()
                },
                TryInvertColor = true, // Handle inverted barcodes
                AutoRotate = true
            };

            var results = BarcodeReader.Read(imageBytes, options);
            return ProcessResults(results, "base64", request.FileName);
        }
        catch (FormatException)
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Invalid Base64 format"
            });
        }
    }

    // Handle URL input (for cloud storage integration)
    [HttpPost("scan-url")]
    public async Task<ActionResult<ScanResult>> ScanFromUrl([FromBody] UrlScanRequest request)
    {
        if (!Uri.TryCreate(request.Url, UriKind.Absolute, out var uri))
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Invalid URL format"
            });
        }

        // Validate URL domain (security measure)
        var allowedDomains = _configuration.GetSection("AllowedDomains").Get<string[]>() 
            ?? new[] { "blob.core.windows.net", "s3.amazonaws.com" };

        if (!allowedDomains.Any(domain => uri.Host.EndsWith(domain)))
        {
            _logger.LogWarning($"Rejected URL from unauthorized domain: {uri.Host}");
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "URL domain not authorized"
            });
        }

        try
        {
            using var httpClient = _httpClientFactory.CreateClient("BarcodeScanner");
            httpClient.Timeout = TimeSpan.FromSeconds(30);

            // Add headers to avoid being blocked
            httpClient.DefaultRequestHeaders.Add("User-Agent", "BarcodeScannerAPI/2.0");

            var response = await httpClient.GetAsync(uri);
            response.EnsureSuccessStatusCode();

            // Check content type
            var contentType = response.Content.Headers.ContentType?.MediaType;
            if (!IsValidContentType(contentType))
            {
                return BadRequest(new ScanResult
                {
                    Success = false,
                    ErrorMessage = $"Unsupported content type: {contentType}"
                });
            }

            var imageBytes = await response.Content.ReadAsByteArrayAsync();

            // Use async processing for better scalability
            var results = await BarcodeReader.ReadAsync(imageBytes);
            return ProcessResults(results, "url", uri.ToString());
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, $"Failed to download from URL: {uri}");
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Failed to download image from URL"
            });
        }
        catch (TaskCanceledException)
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Download timeout - file too large or slow connection"
            });
        }
    }

    // Handle multi-page PDFs with page-specific processing
    [HttpPost("scan-pdf-advanced")]
    public async Task<ActionResult<PdfScanResult>> ScanPdfAdvanced([FromForm] PdfScanRequest request)
    {
        using var stream = new MemoryStream();
        await request.File.CopyToAsync(stream);

        var pdfOptions = new PdfBarcodeReaderOptions
        {
            Scale = request.Scale ?? 3,
            DPI = request.DPI ?? 300,
            PageNumbers = request.PageNumbers,
            Password = request.Password,
            MaxThreads = Math.Min(request.MaxThreads ?? 4, Environment.ProcessorCount)
        };

        // For large PDFs, process in chunks
        if (stream.Length > 50 * 1024 * 1024) // 50MB
        {
            _logger.LogInformation($"Large PDF detected ({stream.Length / 1024 / 1024}MB), using chunked processing");
            pdfOptions.MaxThreads = 2; // Reduce memory pressure
        }

        var results = BarcodeReader.ReadPdf(stream.ToArray(), pdfOptions);

        // Group results by page
        var pageResults = results.GroupBy(r => r.PageNumber)
            .OrderBy(g => g.Key)
            .Select(g => new PageBarcodeResult
            {
                PageNumber = g.Key,
                BarcodeCount = g.Count(),
                Barcodes = g.Select(b => new BarcodeData
                {
                    Value = b.Value,
                    Format = b.BarcodeType.ToString(),
                    Confidence = b.Confidence,
                    Location = b.Bounds
                }).ToList()
            }).ToList();

        return Ok(new PdfScanResult
        {
            Success = true,
            TotalPages = pageResults.Count,
            TotalBarcodes = results.Count(),
            PageResults = pageResults,
            RequestId = Guid.NewGuid().ToString()
        });
    }

    // Handle damaged or low-quality barcodes
    [HttpPost("scan-damaged")]
    public async Task<ActionResult<ScanResult>> ScanDamagedBarcode([FromForm] IFormFile file)
    {
        using var stream = new MemoryStream();
        await file.CopyToAsync(stream);

        // Aggressive image correction for damaged barcodes
        var options = new BarcodeReaderOptions
        {
            Speed = ReadingSpeed.ExtremeDetail,
            ImageFilters = new ImageFilterCollection
            {
                new SharpenFilter(4),
                new ContrastFilter(3),
                new BrightnessFilter(1.5f),
                new BinaryThresholdFilter(128),
                new DeNoise(3)
            },
            TryInvertColor = true,
            AutoRotate = true,
            UseCode39ExtendedMode = true,
            RemoveFalsePositive = false, // Accept lower confidence
            Confidence = ConfidenceLevel.Low
        };

        var results = BarcodeReader.Read(stream.ToArray(), options);

        // If still no results, try with different threshold
        if (!results.Any())
        {
            options.ImageFilters = new ImageFilterCollection
            {
                new AdaptiveThresholdFilter(9),
                new MedianFilter(3),
                new Dilate(1)
            };

            results = BarcodeReader.Read(stream.ToArray(), options);
        }

        return ProcessResults(results, "damaged", file.FileName);
    }

    private bool IsValidContentType(string contentType)
    {
        var validTypes = new[]
        {
            "image/jpeg", "image/jpg", "image/png", "image/gif",
            "image/tiff", "image/bmp", "application/pdf"
        };
        return validTypes.Contains(contentType?.ToLower());
    }

    private ActionResult<ScanResult> ProcessResults(BarcodeResults results, string source, string identifier)
    {
        var scanResult = new ScanResult
        {
            Metadata = new Dictionary<string, object>
            {
                ["Source"] = source,
                ["Identifier"] = identifier,
                ["ProcessedAt"] = DateTime.UtcNow
            }
        };

        if (results.Any())
        {
            scanResult.Success = true;
            scanResult.Barcodes = results.Select(r => new BarcodeData
            {
                Value = r.Value,
                Format = r.BarcodeType.ToString(),
                Confidence = r.Confidence,
                Location = r.Bounds
            }).ToList();

            // Log low confidence results for quality monitoring
            var lowConfidence = results.Where(r => r.Confidence < 70).ToList();
            if (lowConfidence.Any())
            {
                _logger.LogWarning($"Low confidence barcodes detected: {lowConfidence.Count} of {results.Count()} from {identifier}");
            }
        }
        else
        {
            scanResult.Success = false;
            scanResult.ErrorMessage = "No barcodes detected";
        }

        return Ok(scanResult);
    }
}

// Request models
public class Base64Request
{
    [Required]
    public string ImageData { get; set; }
    public string FileName { get; set; }
}

public class UrlScanRequest
{
    [Required]
    [Url]
    public string Url { get; set; }
}

public class PdfScanRequest
{
    [Required]
    public IFormFile File { get; set; }
    public int? Scale { get; set; }
    public int? DPI { get; set; }
    public int[] PageNumbers { get; set; }
    public string Password { get; set; }
    public int? MaxThreads { get; set; }
}

// Response models
public class PdfScanResult : ScanResult
{
    public int TotalPages { get; set; }
    public int TotalBarcodes { get; set; }
    public List<PageBarcodeResult> PageResults { get; set; }
}

public class PageBarcodeResult
{
    public int PageNumber { get; set; }
    public int BarcodeCount { get; set; }
    public List<BarcodeData> Barcodes { get; set; }
}

// Extended controller with multiple input handlers
[ApiController]
[Route("api/v1/[controller]")]
[Authorize]
public class AdvancedScannerController : ControllerBase
{
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly ILogger<AdvancedScannerController> _logger;

    public AdvancedScannerController(
        IHttpClientFactory httpClientFactory, 
        ILogger<AdvancedScannerController> logger)
    {
        _httpClientFactory = httpClientFactory;
        _logger = logger;
    }

    // Handle Base64 input (common in web applications)
    [HttpPost("scan-base64")]
    public ActionResult<ScanResult> ScanBase64([FromBody] Base64Request request)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        try
        {
            // Validate Base64 format
            var base64Data = request.ImageData;
            if (base64Data.Contains(","))
            {
                // Handle data URL format: "data:image/png;base64,..."
                base64Data = base64Data.Substring(base64Data.IndexOf(",") + 1);
            }

            var imageBytes = Convert.FromBase64String(base64Data);

            // Implement size validation
            if (imageBytes.Length > 10 * 1024 * 1024) // 10MB limit
            {
                return BadRequest(new ScanResult
                {
                    Success = false,
                    ErrorMessage = "Image size exceeds 10MB limit"
                });
            }

            // Configure for web-uploaded images (often lower quality)
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Detailed,
                ImageFilters = new ImageFilterCollection
                {
                    new SharpenFilter(3),
                    new ContrastFilter(2),
                    new DeNoise()
                },
                TryInvertColor = true, // Handle inverted barcodes
                AutoRotate = true
            };

            var results = BarcodeReader.Read(imageBytes, options);
            return ProcessResults(results, "base64", request.FileName);
        }
        catch (FormatException)
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Invalid Base64 format"
            });
        }
    }

    // Handle URL input (for cloud storage integration)
    [HttpPost("scan-url")]
    public async Task<ActionResult<ScanResult>> ScanFromUrl([FromBody] UrlScanRequest request)
    {
        if (!Uri.TryCreate(request.Url, UriKind.Absolute, out var uri))
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Invalid URL format"
            });
        }

        // Validate URL domain (security measure)
        var allowedDomains = _configuration.GetSection("AllowedDomains").Get<string[]>() 
            ?? new[] { "blob.core.windows.net", "s3.amazonaws.com" };

        if (!allowedDomains.Any(domain => uri.Host.EndsWith(domain)))
        {
            _logger.LogWarning($"Rejected URL from unauthorized domain: {uri.Host}");
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "URL domain not authorized"
            });
        }

        try
        {
            using var httpClient = _httpClientFactory.CreateClient("BarcodeScanner");
            httpClient.Timeout = TimeSpan.FromSeconds(30);

            // Add headers to avoid being blocked
            httpClient.DefaultRequestHeaders.Add("User-Agent", "BarcodeScannerAPI/2.0");

            var response = await httpClient.GetAsync(uri);
            response.EnsureSuccessStatusCode();

            // Check content type
            var contentType = response.Content.Headers.ContentType?.MediaType;
            if (!IsValidContentType(contentType))
            {
                return BadRequest(new ScanResult
                {
                    Success = false,
                    ErrorMessage = $"Unsupported content type: {contentType}"
                });
            }

            var imageBytes = await response.Content.ReadAsByteArrayAsync();

            // Use async processing for better scalability
            var results = await BarcodeReader.ReadAsync(imageBytes);
            return ProcessResults(results, "url", uri.ToString());
        }
        catch (HttpRequestException ex)
        {
            _logger.LogError(ex, $"Failed to download from URL: {uri}");
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Failed to download image from URL"
            });
        }
        catch (TaskCanceledException)
        {
            return BadRequest(new ScanResult
            {
                Success = false,
                ErrorMessage = "Download timeout - file too large or slow connection"
            });
        }
    }

    // Handle multi-page PDFs with page-specific processing
    [HttpPost("scan-pdf-advanced")]
    public async Task<ActionResult<PdfScanResult>> ScanPdfAdvanced([FromForm] PdfScanRequest request)
    {
        using var stream = new MemoryStream();
        await request.File.CopyToAsync(stream);

        var pdfOptions = new PdfBarcodeReaderOptions
        {
            Scale = request.Scale ?? 3,
            DPI = request.DPI ?? 300,
            PageNumbers = request.PageNumbers,
            Password = request.Password,
            MaxThreads = Math.Min(request.MaxThreads ?? 4, Environment.ProcessorCount)
        };

        // For large PDFs, process in chunks
        if (stream.Length > 50 * 1024 * 1024) // 50MB
        {
            _logger.LogInformation($"Large PDF detected ({stream.Length / 1024 / 1024}MB), using chunked processing");
            pdfOptions.MaxThreads = 2; // Reduce memory pressure
        }

        var results = BarcodeReader.ReadPdf(stream.ToArray(), pdfOptions);

        // Group results by page
        var pageResults = results.GroupBy(r => r.PageNumber)
            .OrderBy(g => g.Key)
            .Select(g => new PageBarcodeResult
            {
                PageNumber = g.Key,
                BarcodeCount = g.Count(),
                Barcodes = g.Select(b => new BarcodeData
                {
                    Value = b.Value,
                    Format = b.BarcodeType.ToString(),
                    Confidence = b.Confidence,
                    Location = b.Bounds
                }).ToList()
            }).ToList();

        return Ok(new PdfScanResult
        {
            Success = true,
            TotalPages = pageResults.Count,
            TotalBarcodes = results.Count(),
            PageResults = pageResults,
            RequestId = Guid.NewGuid().ToString()
        });
    }

    // Handle damaged or low-quality barcodes
    [HttpPost("scan-damaged")]
    public async Task<ActionResult<ScanResult>> ScanDamagedBarcode([FromForm] IFormFile file)
    {
        using var stream = new MemoryStream();
        await file.CopyToAsync(stream);

        // Aggressive image correction for damaged barcodes
        var options = new BarcodeReaderOptions
        {
            Speed = ReadingSpeed.ExtremeDetail,
            ImageFilters = new ImageFilterCollection
            {
                new SharpenFilter(4),
                new ContrastFilter(3),
                new BrightnessFilter(1.5f),
                new BinaryThresholdFilter(128),
                new DeNoise(3)
            },
            TryInvertColor = true,
            AutoRotate = true,
            UseCode39ExtendedMode = true,
            RemoveFalsePositive = false, // Accept lower confidence
            Confidence = ConfidenceLevel.Low
        };

        var results = BarcodeReader.Read(stream.ToArray(), options);

        // If still no results, try with different threshold
        if (!results.Any())
        {
            options.ImageFilters = new ImageFilterCollection
            {
                new AdaptiveThresholdFilter(9),
                new MedianFilter(3),
                new Dilate(1)
            };

            results = BarcodeReader.Read(stream.ToArray(), options);
        }

        return ProcessResults(results, "damaged", file.FileName);
    }

    private bool IsValidContentType(string contentType)
    {
        var validTypes = new[]
        {
            "image/jpeg", "image/jpg", "image/png", "image/gif",
            "image/tiff", "image/bmp", "application/pdf"
        };
        return validTypes.Contains(contentType?.ToLower());
    }

    private ActionResult<ScanResult> ProcessResults(BarcodeResults results, string source, string identifier)
    {
        var scanResult = new ScanResult
        {
            Metadata = new Dictionary<string, object>
            {
                ["Source"] = source,
                ["Identifier"] = identifier,
                ["ProcessedAt"] = DateTime.UtcNow
            }
        };

        if (results.Any())
        {
            scanResult.Success = true;
            scanResult.Barcodes = results.Select(r => new BarcodeData
            {
                Value = r.Value,
                Format = r.BarcodeType.ToString(),
                Confidence = r.Confidence,
                Location = r.Bounds
            }).ToList();

            // Log low confidence results for quality monitoring
            var lowConfidence = results.Where(r => r.Confidence < 70).ToList();
            if (lowConfidence.Any())
            {
                _logger.LogWarning($"Low confidence barcodes detected: {lowConfidence.Count} of {results.Count()} from {identifier}");
            }
        }
        else
        {
            scanResult.Success = false;
            scanResult.ErrorMessage = "No barcodes detected";
        }

        return Ok(scanResult);
    }
}

// Request models
public class Base64Request
{
    [Required]
    public string ImageData { get; set; }
    public string FileName { get; set; }
}

public class UrlScanRequest
{
    [Required]
    [Url]
    public string Url { get; set; }
}

public class PdfScanRequest
{
    [Required]
    public IFormFile File { get; set; }
    public int? Scale { get; set; }
    public int? DPI { get; set; }
    public int[] PageNumbers { get; set; }
    public string Password { get; set; }
    public int? MaxThreads { get; set; }
}

// Response models
public class PdfScanResult : ScanResult
{
    public int TotalPages { get; set; }
    public int TotalBarcodes { get; set; }
    public List<PageBarcodeResult> PageResults { get; set; }
}

public class PageBarcodeResult
{
    public int PageNumber { get; set; }
    public int BarcodeCount { get; set; }
    public List<BarcodeData> Barcodes { get; set; }
}

Diese vollständige Implementierung deckt reale Unternehmensszenarien ab. Der URL-Scanning-Endpunkt beinhaltet eine Domänenvalidierung, um Server-Side Request Forgery (SSRF)-Angriffe zu verhindern. Der Base64-Handler entfernt die Daten-URL-Präfixe, die beim Empfang von Bildern von Webanwendungen häufig vorkommen.

Der beschädigte Barcode-Endpunkt demonstriert die Bildkorrekturfähigkeiten von IronBarcode. Durch die Anwendung mehrerer Filter und das Ausprobieren verschiedener Ansätze können Daten aus stark beschädigten Bildern wiederhergestellt werden. Dies erweist sich als unschätzbar wertvoll beim Umgang mit alten Inventaretiketten oder wettergeschädigten Versanddokumenten.

Verbesserung von Leistung und Genauigkeit

Bei der Leistungsoptimierung beim Barcode-Scannen in Unternehmen geht es nicht nur um Geschwindigkeit – es geht darum, das richtige Gleichgewicht für Ihren spezifischen Anwendungsfall zu finden. Lassen Sie uns fortgeschrittene Optimierungstechniken erkunden, die Ihre Scanleistung verändern können:

public class OptimizedScannerService
{
    private readonly ILogger<OptimizedScannerService> _logger;
    private readonly IMemoryCache _cache;

    public OptimizedScannerService(ILogger<OptimizedScannerService> logger, IMemoryCache cache)
    {
        _logger = logger;
        _cache = cache;
    }

    // Performance-optimized scanning with caching
    public async Task<ScanResult> ScanWithOptimizationsAsync(byte[] imageData, string cacheKey = null)
    {
        // Check cache for repeat scans
        if (!string.IsNullOrEmpty(cacheKey))
        {
            if (_cache.TryGetValue(cacheKey, out ScanResult cachedResult))
            {
                _logger.LogInformation($"Cache hit for {cacheKey}");
                cachedResult.Metadata["CacheHit"] = true;
                return cachedResult;
            }
        }

        // Determine optimal settings based on image characteristics
        var settings = await DetermineOptimalSettingsAsync(imageData);

        // Apply region-specific scanning if applicable
        if (settings.UseRegionScanning)
        {
            return await ScanWithRegionsAsync(imageData, settings);
        }

        // Standard optimized scanning
        var results = await BarcodeReader.ReadAsync(imageData, settings.Options);
        var scanResult = BuildScanResult(results);

        // Cache successful results
        if (!string.IsNullOrEmpty(cacheKey) && scanResult.Success)
        {
            _cache.Set(cacheKey, scanResult, TimeSpan.FromMinutes(5));
        }

        return scanResult;
    }

    // Intelligent settings determination
    private async Task<ScanSettings> DetermineOptimalSettingsAsync(byte[] imageData)
    {
        var settings = new ScanSettings();

        // Quick analysis of image properties
        using var ms = new MemoryStream(imageData);
        using var image = Image.FromStream(ms);

        var width = image.Width;
        var height = image.Height;
        var aspectRatio = (double)width / height;

        _logger.LogInformation($"Image analysis: {width}x{height}, ratio: {aspectRatio:F2}");

        // High-resolution images can use faster scanning
        if (width > 2000 && height > 2000)
        {
            settings.Options.Speed = ReadingSpeed.Faster;
            settings.Options.ExpectBarcodeTypes = BarcodeEncoding.QRCode | BarcodeEncoding.Code128;
        }
        // Low-resolution needs more processing
        else if (width < 800 || height < 800)
        {
            settings.Options.Speed = ReadingSpeed.ExtremeDetail;
            settings.Options.ImageFilters = new ImageFilterCollection
            {
                new SharpenFilter(3),
                new ContrastFilter(2)
            };
        }
        else
        {
            settings.Options.Speed = ReadingSpeed.Balanced;
        }

        // Detect if image might contain multiple barcodes based on aspect ratio
        if (aspectRatio > 2 || aspectRatio < 0.5)
        {
            settings.Options.ExpectMultipleBarcodes = true;
            settings.UseRegionScanning = true;
        }

        // Enable rotation correction for potentially skewed images
        settings.Options.AutoRotate = true;

        return settings;
    }

    // Region-based scanning for large images
    private async Task<ScanResult> ScanWithRegionsAsync(byte[] imageData, ScanSettings settings)
    {
        var allResults = new List<BarcodeResult>();
        using var ms = new MemoryStream(imageData);
        using var image = Image.FromStream(ms);

        // Define scanning regions for common document layouts
        var regions = new[]
        {
            new Rectangle(0, 0, image.Width / 2, image.Height / 2), // Top-left
            new Rectangle(image.Width / 2, 0, image.Width / 2, image.Height / 2), // Top-right
            new Rectangle(0, image.Height / 2, image.Width / 2, image.Height / 2), // Bottom-left
            new Rectangle(image.Width / 2, image.Height / 2, image.Width / 2, image.Height / 2), // Bottom-right
            new Rectangle(image.Width / 4, image.Height / 4, image.Width / 2, image.Height / 2) // Center
        };

        var tasks = regions.Select(async region =>
        {
            var regionOptions = new BarcodeReaderOptions
            {
                CropArea = region,
                Speed = ReadingSpeed.Faster,
                ExpectMultipleBarcodes = false
            };

            try
            {
                return await BarcodeReader.ReadAsync(imageData, regionOptions);
            }
            catch (Exception ex)
            {
                _logger.LogWarning($"Region scan failed: {ex.Message}");
                return new BarcodeResult[0];
            }
        });

        var regionResults = await Task.WhenAll(tasks);

        // Combine and deduplicate results
        var uniqueResults = regionResults
            .SelectMany(r => r)
            .GroupBy(r => r.Value)
            .Select(g => g.OrderByDescending(r => r.Confidence).First())
            .ToList();

        return BuildScanResult(uniqueResults);
    }

    // Adaptive quality enhancement
    public async Task<ScanResult> ScanWithAdaptiveEnhancementAsync(byte[] imageData)
    {
        var attempts = new List<Func<Task<BarcodeResults>>>
        {
            // Attempt 1: Fast scan
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Faster,
                RemoveFalsePositive = true
            }),

            // Attempt 2: Standard scan with basic filters
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                ImageFilters = new ImageFilterCollection
                {
                    new ContrastFilter(1.5f),
                    new SharpenFilter(1)
                },
                TryInvertColor = true
            }),

            // Attempt 3: Detailed scan with aggressive filtering
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Detailed,
                ImageFilters = new ImageFilterCollection
                {
                    new AdaptiveThresholdFilter(11),
                    new DeNoise(2),
                    new MedianFilter(3)
                },
                AutoRotate = true,
                Confidence = ConfidenceLevel.Low
            }),

            // Attempt 4: Extreme processing for damaged barcodes
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.ExtremeDetail,
                ImageFilters = new ImageFilterCollection
                {
                    new BinaryThresholdFilter(100),
                    new Erode(1),
                    new Dilate(2),
                    new SharpenFilter(4)
                },
                RemoveFalsePositive = false,
                UseCode39ExtendedMode = true,
                TryInvertColor = true
            })
        };

        foreach (var (attempt, index) in attempts.Select((a, i) => (a, i)))
        {
            var stopwatch = Stopwatch.StartNew();
            var results = await attempt();
            stopwatch.Stop();

            _logger.LogInformation($"Attempt {index + 1} took {stopwatch.ElapsedMilliseconds}ms, found {results.Count()} barcodes");

            if (results.Any())
            {
                var scanResult = BuildScanResult(results);
                scanResult.Metadata["AttemptNumber"] = index + 1;
                scanResult.Metadata["ProcessingStrategy"] = GetStrategyName(index);
                return scanResult;
            }
        }

        return new ScanResult
        {
            Success = false,
            ErrorMessage = "No barcodes found after all enhancement attempts"
        };
    }

    // Machine learning confidence optimization
    public class MLOptimizedScanner
    {
        private readonly Dictionary<string, double> _formatConfidenceThresholds = new()
        {
            { "QRCode", 85.0 },
            { "Code128", 90.0 },
            { "Code39", 88.0 },
            { "DataMatrix", 87.0 },
            { "EAN13", 92.0 },
            { "PDF417", 86.0 }
        };

        public async Task<ScanResult> ScanWithMLConfidenceAsync(byte[] imageData, string expectedFormat = null)
        {
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                Confidence = ConfidenceLevel.Optional
            };

            // If we know the expected format, improve for it
            if (!string.IsNullOrEmpty(expectedFormat) && 
                Enum.TryParse<BarcodeEncoding>(expectedFormat, out var encoding))
            {
                options.ExpectBarcodeTypes = encoding;
            }

            var results = await BarcodeReader.ReadAsync(imageData, options);

            // Apply ML confidence filtering
            var confidenceThreshold = expectedFormat != null && 
                _formatConfidenceThresholds.ContainsKey(expectedFormat)
                ? _formatConfidenceThresholds[expectedFormat]
                : 80.0;

            var highConfidenceResults = results
                .Where(r => r.Confidence >= confidenceThreshold)
                .ToList();

            if (highConfidenceResults.Any())
            {
                return BuildScanResult(highConfidenceResults);
            }

            // If no high-confidence results, include lower confidence with warnings
            var lowConfidenceResults = results
                .Where(r => r.Confidence < confidenceThreshold)
                .ToList();

            if (lowConfidenceResults.Any())
            {
                var result = BuildScanResult(lowConfidenceResults);
                result.Metadata["Warning"] = "Low confidence results - manual verification recommended";
                result.Metadata["MinConfidence"] = lowConfidenceResults.Min(r => r.Confidence);
                return result;
            }

            return new ScanResult
            {
                Success = false,
                ErrorMessage = "No barcodes met confidence threshold"
            };
        }
    }

    private ScanResult BuildScanResult(IEnumerable<BarcodeResult> results)
    {
        var resultList = results.ToList();
        return new ScanResult
        {
            Success = true,
            Barcodes = resultList.Select(r => new BarcodeData
            {
                Value = r.Value,
                Format = r.BarcodeType.ToString(),
                Confidence = r.Confidence,
                Location = r.Bounds
            }).ToList(),
            Metadata = new Dictionary<string, object>
            {
                ["TotalFound"] = resultList.Count,
                ["AverageConfidence"] = resultList.Average(r => r.Confidence),
                ["Formats"] = resultList.Select(r => r.BarcodeType.ToString()).Distinct().ToArray()
            }
        };
    }

    private string GetStrategyName(int attemptIndex)
    {
        return attemptIndex switch
        {
            0 => "FastScan",
            1 => "StandardEnhanced",
            2 => "DetailedFiltering",
            3 => "ExtremeDamageRecovery",
            _ => "Unknown"
        };
    }
}

// Supporting classes
public class ScanSettings
{
    public BarcodeReaderOptions Options { get; set; } = new BarcodeReaderOptions();
    public bool UseRegionScanning { get; set; }
    public List<Rectangle> CustomRegions { get; set; }
}

// Benchmark service for performance testing
public class BenchmarkService
{
    private readonly ILogger<BenchmarkService> _logger;

    public async Task<BenchmarkResult> BenchmarkSettingsAsync(byte[] testImage, int iterations = 10)
    {
        var results = new Dictionary<string, BenchmarkData>();

        var testConfigurations = new Dictionary<string, BarcodeReaderOptions>
        {
            ["Fastest"] = new() { Speed = ReadingSpeed.Faster },
            ["Balanced"] = new() { Speed = ReadingSpeed.Balanced },
            ["Detailed"] = new() { Speed = ReadingSpeed.Detailed },
            ["Parallel"] = new() { Speed = ReadingSpeed.Balanced, Multithreaded = true, MaxParallelThreads = 4 },
            ["Filtered"] = new() 
            { 
                Speed = ReadingSpeed.Balanced, 
                ImageFilters = new ImageFilterCollection { new SharpenFilter(2), new ContrastFilter(1.5f) } 
            }
        };

        foreach (var config in testConfigurations)
        {
            var times = new List<long>();
            var successCount = 0;

            for (int i = 0; i < iterations; i++)
            {
                var sw = Stopwatch.StartNew();
                var scanResults = await BarcodeReader.ReadAsync(testImage, config.Value);
                sw.Stop();

                times.Add(sw.ElapsedMilliseconds);
                if (scanResults.Any()) successCount++;

                // Small delay between tests
                await Task.Delay(100);
            }

            results[config.Key] = new BenchmarkData
            {
                AverageMs = times.Average(),
                MinMs = times.Min(),
                MaxMs = times.Max(),
                SuccessRate = (double)successCount / iterations * 100
            };
        }

        return new BenchmarkResult { Results = results };
    }
}

public class BenchmarkData
{
    public double AverageMs { get; set; }
    public long MinMs { get; set; }
    public long MaxMs { get; set; }
    public double SuccessRate { get; set; }
}

public class BenchmarkResult
{
    public Dictionary<string, BenchmarkData> Results { get; set; }
}

public class OptimizedScannerService
{
    private readonly ILogger<OptimizedScannerService> _logger;
    private readonly IMemoryCache _cache;

    public OptimizedScannerService(ILogger<OptimizedScannerService> logger, IMemoryCache cache)
    {
        _logger = logger;
        _cache = cache;
    }

    // Performance-optimized scanning with caching
    public async Task<ScanResult> ScanWithOptimizationsAsync(byte[] imageData, string cacheKey = null)
    {
        // Check cache for repeat scans
        if (!string.IsNullOrEmpty(cacheKey))
        {
            if (_cache.TryGetValue(cacheKey, out ScanResult cachedResult))
            {
                _logger.LogInformation($"Cache hit for {cacheKey}");
                cachedResult.Metadata["CacheHit"] = true;
                return cachedResult;
            }
        }

        // Determine optimal settings based on image characteristics
        var settings = await DetermineOptimalSettingsAsync(imageData);

        // Apply region-specific scanning if applicable
        if (settings.UseRegionScanning)
        {
            return await ScanWithRegionsAsync(imageData, settings);
        }

        // Standard optimized scanning
        var results = await BarcodeReader.ReadAsync(imageData, settings.Options);
        var scanResult = BuildScanResult(results);

        // Cache successful results
        if (!string.IsNullOrEmpty(cacheKey) && scanResult.Success)
        {
            _cache.Set(cacheKey, scanResult, TimeSpan.FromMinutes(5));
        }

        return scanResult;
    }

    // Intelligent settings determination
    private async Task<ScanSettings> DetermineOptimalSettingsAsync(byte[] imageData)
    {
        var settings = new ScanSettings();

        // Quick analysis of image properties
        using var ms = new MemoryStream(imageData);
        using var image = Image.FromStream(ms);

        var width = image.Width;
        var height = image.Height;
        var aspectRatio = (double)width / height;

        _logger.LogInformation($"Image analysis: {width}x{height}, ratio: {aspectRatio:F2}");

        // High-resolution images can use faster scanning
        if (width > 2000 && height > 2000)
        {
            settings.Options.Speed = ReadingSpeed.Faster;
            settings.Options.ExpectBarcodeTypes = BarcodeEncoding.QRCode | BarcodeEncoding.Code128;
        }
        // Low-resolution needs more processing
        else if (width < 800 || height < 800)
        {
            settings.Options.Speed = ReadingSpeed.ExtremeDetail;
            settings.Options.ImageFilters = new ImageFilterCollection
            {
                new SharpenFilter(3),
                new ContrastFilter(2)
            };
        }
        else
        {
            settings.Options.Speed = ReadingSpeed.Balanced;
        }

        // Detect if image might contain multiple barcodes based on aspect ratio
        if (aspectRatio > 2 || aspectRatio < 0.5)
        {
            settings.Options.ExpectMultipleBarcodes = true;
            settings.UseRegionScanning = true;
        }

        // Enable rotation correction for potentially skewed images
        settings.Options.AutoRotate = true;

        return settings;
    }

    // Region-based scanning for large images
    private async Task<ScanResult> ScanWithRegionsAsync(byte[] imageData, ScanSettings settings)
    {
        var allResults = new List<BarcodeResult>();
        using var ms = new MemoryStream(imageData);
        using var image = Image.FromStream(ms);

        // Define scanning regions for common document layouts
        var regions = new[]
        {
            new Rectangle(0, 0, image.Width / 2, image.Height / 2), // Top-left
            new Rectangle(image.Width / 2, 0, image.Width / 2, image.Height / 2), // Top-right
            new Rectangle(0, image.Height / 2, image.Width / 2, image.Height / 2), // Bottom-left
            new Rectangle(image.Width / 2, image.Height / 2, image.Width / 2, image.Height / 2), // Bottom-right
            new Rectangle(image.Width / 4, image.Height / 4, image.Width / 2, image.Height / 2) // Center
        };

        var tasks = regions.Select(async region =>
        {
            var regionOptions = new BarcodeReaderOptions
            {
                CropArea = region,
                Speed = ReadingSpeed.Faster,
                ExpectMultipleBarcodes = false
            };

            try
            {
                return await BarcodeReader.ReadAsync(imageData, regionOptions);
            }
            catch (Exception ex)
            {
                _logger.LogWarning($"Region scan failed: {ex.Message}");
                return new BarcodeResult[0];
            }
        });

        var regionResults = await Task.WhenAll(tasks);

        // Combine and deduplicate results
        var uniqueResults = regionResults
            .SelectMany(r => r)
            .GroupBy(r => r.Value)
            .Select(g => g.OrderByDescending(r => r.Confidence).First())
            .ToList();

        return BuildScanResult(uniqueResults);
    }

    // Adaptive quality enhancement
    public async Task<ScanResult> ScanWithAdaptiveEnhancementAsync(byte[] imageData)
    {
        var attempts = new List<Func<Task<BarcodeResults>>>
        {
            // Attempt 1: Fast scan
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Faster,
                RemoveFalsePositive = true
            }),

            // Attempt 2: Standard scan with basic filters
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                ImageFilters = new ImageFilterCollection
                {
                    new ContrastFilter(1.5f),
                    new SharpenFilter(1)
                },
                TryInvertColor = true
            }),

            // Attempt 3: Detailed scan with aggressive filtering
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Detailed,
                ImageFilters = new ImageFilterCollection
                {
                    new AdaptiveThresholdFilter(11),
                    new DeNoise(2),
                    new MedianFilter(3)
                },
                AutoRotate = true,
                Confidence = ConfidenceLevel.Low
            }),

            // Attempt 4: Extreme processing for damaged barcodes
            async () => await BarcodeReader.ReadAsync(imageData, new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.ExtremeDetail,
                ImageFilters = new ImageFilterCollection
                {
                    new BinaryThresholdFilter(100),
                    new Erode(1),
                    new Dilate(2),
                    new SharpenFilter(4)
                },
                RemoveFalsePositive = false,
                UseCode39ExtendedMode = true,
                TryInvertColor = true
            })
        };

        foreach (var (attempt, index) in attempts.Select((a, i) => (a, i)))
        {
            var stopwatch = Stopwatch.StartNew();
            var results = await attempt();
            stopwatch.Stop();

            _logger.LogInformation($"Attempt {index + 1} took {stopwatch.ElapsedMilliseconds}ms, found {results.Count()} barcodes");

            if (results.Any())
            {
                var scanResult = BuildScanResult(results);
                scanResult.Metadata["AttemptNumber"] = index + 1;
                scanResult.Metadata["ProcessingStrategy"] = GetStrategyName(index);
                return scanResult;
            }
        }

        return new ScanResult
        {
            Success = false,
            ErrorMessage = "No barcodes found after all enhancement attempts"
        };
    }

    // Machine learning confidence optimization
    public class MLOptimizedScanner
    {
        private readonly Dictionary<string, double> _formatConfidenceThresholds = new()
        {
            { "QRCode", 85.0 },
            { "Code128", 90.0 },
            { "Code39", 88.0 },
            { "DataMatrix", 87.0 },
            { "EAN13", 92.0 },
            { "PDF417", 86.0 }
        };

        public async Task<ScanResult> ScanWithMLConfidenceAsync(byte[] imageData, string expectedFormat = null)
        {
            var options = new BarcodeReaderOptions
            {
                Speed = ReadingSpeed.Balanced,
                Confidence = ConfidenceLevel.Optional
            };

            // If we know the expected format, improve for it
            if (!string.IsNullOrEmpty(expectedFormat) && 
                Enum.TryParse<BarcodeEncoding>(expectedFormat, out var encoding))
            {
                options.ExpectBarcodeTypes = encoding;
            }

            var results = await BarcodeReader.ReadAsync(imageData, options);

            // Apply ML confidence filtering
            var confidenceThreshold = expectedFormat != null && 
                _formatConfidenceThresholds.ContainsKey(expectedFormat)
                ? _formatConfidenceThresholds[expectedFormat]
                : 80.0;

            var highConfidenceResults = results
                .Where(r => r.Confidence >= confidenceThreshold)
                .ToList();

            if (highConfidenceResults.Any())
            {
                return BuildScanResult(highConfidenceResults);
            }

            // If no high-confidence results, include lower confidence with warnings
            var lowConfidenceResults = results
                .Where(r => r.Confidence < confidenceThreshold)
                .ToList();

            if (lowConfidenceResults.Any())
            {
                var result = BuildScanResult(lowConfidenceResults);
                result.Metadata["Warning"] = "Low confidence results - manual verification recommended";
                result.Metadata["MinConfidence"] = lowConfidenceResults.Min(r => r.Confidence);
                return result;
            }

            return new ScanResult
            {
                Success = false,
                ErrorMessage = "No barcodes met confidence threshold"
            };
        }
    }

    private ScanResult BuildScanResult(IEnumerable<BarcodeResult> results)
    {
        var resultList = results.ToList();
        return new ScanResult
        {
            Success = true,
            Barcodes = resultList.Select(r => new BarcodeData
            {
                Value = r.Value,
                Format = r.BarcodeType.ToString(),
                Confidence = r.Confidence,
                Location = r.Bounds
            }).ToList(),
            Metadata = new Dictionary<string, object>
            {
                ["TotalFound"] = resultList.Count,
                ["AverageConfidence"] = resultList.Average(r => r.Confidence),
                ["Formats"] = resultList.Select(r => r.BarcodeType.ToString()).Distinct().ToArray()
            }
        };
    }

    private string GetStrategyName(int attemptIndex)
    {
        return attemptIndex switch
        {
            0 => "FastScan",
            1 => "StandardEnhanced",
            2 => "DetailedFiltering",
            3 => "ExtremeDamageRecovery",
            _ => "Unknown"
        };
    }
}

// Supporting classes
public class ScanSettings
{
    public BarcodeReaderOptions Options { get; set; } = new BarcodeReaderOptions();
    public bool UseRegionScanning { get; set; }
    public List<Rectangle> CustomRegions { get; set; }
}

// Benchmark service for performance testing
public class BenchmarkService
{
    private readonly ILogger<BenchmarkService> _logger;

    public async Task<BenchmarkResult> BenchmarkSettingsAsync(byte[] testImage, int iterations = 10)
    {
        var results = new Dictionary<string, BenchmarkData>();

        var testConfigurations = new Dictionary<string, BarcodeReaderOptions>
        {
            ["Fastest"] = new() { Speed = ReadingSpeed.Faster },
            ["Balanced"] = new() { Speed = ReadingSpeed.Balanced },
            ["Detailed"] = new() { Speed = ReadingSpeed.Detailed },
            ["Parallel"] = new() { Speed = ReadingSpeed.Balanced, Multithreaded = true, MaxParallelThreads = 4 },
            ["Filtered"] = new() 
            { 
                Speed = ReadingSpeed.Balanced, 
                ImageFilters = new ImageFilterCollection { new SharpenFilter(2), new ContrastFilter(1.5f) } 
            }
        };

        foreach (var config in testConfigurations)
        {
            var times = new List<long>();
            var successCount = 0;

            for (int i = 0; i < iterations; i++)
            {
                var sw = Stopwatch.StartNew();
                var scanResults = await BarcodeReader.ReadAsync(testImage, config.Value);
                sw.Stop();

                times.Add(sw.ElapsedMilliseconds);
                if (scanResults.Any()) successCount++;

                // Small delay between tests
                await Task.Delay(100);
            }

            results[config.Key] = new BenchmarkData
            {
                AverageMs = times.Average(),
                MinMs = times.Min(),
                MaxMs = times.Max(),
                SuccessRate = (double)successCount / iterations * 100
            };
        }

        return new BenchmarkResult { Results = results };
    }
}

public class BenchmarkData
{
    public double AverageMs { get; set; }
    public long MinMs { get; set; }
    public long MaxMs { get; set; }
    public double SuccessRate { get; set; }
}

public class BenchmarkResult
{
    public Dictionary<string, BenchmarkData> Results { get; set; }
}

Dieser fortschrittliche Optimierungsansatz demonstriert verschiedene professionelle Techniken. Die intelligente Einstellungsbestimmung analysiert Bildeigenschaften, um automatisch optimale Verarbeitungsparameter auszuwählen. Hochauflösende Bilder moderner Kameras können schneller verarbeitet werden, während Scans geringerer Qualität eine verbesserte Filterung erfahren.

Regionsbasiertes Scannen erweist sich insbesondere bei großformatigen Dokumenten als sehr effektiv. Durch die Aufteilung des Bildes in Regionen und deren parallele Verarbeitung lassen sich deutliche Leistungsverbesserungen erzielen. Diese Technik eignet sich besonders gut für standardisierte Formulare, bei denen die Positionen der Barcodes vorhersehbar sind.

Erstellen von QR-Code-Bildern in C

Während das Scannen unerlässlich ist, müssen viele Unternehmensanwendungen auch Barcodes generieren. IronBarcode macht das Erstellen von Barcodes so einfach wie das Lesen. Hier erfahren Sie, wie Sie QR-Codes für verschiedene Unternehmensszenarien generieren:

public class BarcodeGenerationService
{
    private readonly ILogger<BarcodeGenerationService> _logger;

    // Generate QR codes for asset tracking
    public byte[] GenerateAssetQRCode(AssetInfo asset)
    {
        // Create JSON payload with asset information
        var assetData = JsonSerializer.Serialize(new
        {
            Id = asset.AssetId,
            Type = asset.AssetType,
            Location = asset.CurrentLocation,
            LastMaintenance = asset.LastMaintenanceDate,
            Url = "___PROTECTED_URL_45___"
        });

        // Generate QR code with high error correction for durability
        var qrCode = QRCodeWriter.CreateQrCode(assetData, 500, QRCodeWriter.QrErrorCorrectionLevel.High);

        // Add company branding
        qrCode.AddAnnotationTextAboveBarcode($"ASSET: {asset.AssetId}");
        qrCode.AddAnnotationTextBelowBarcode(asset.AssetType);
        qrCode.SetMargins(10);

        // Style for printing on asset labels
        qrCode.ChangeBarCodeColor(Color.Black);
        qrCode.ChangeBackgroundColor(Color.White);

        return qrCode.ToStream().ToArray();
    }

    // Generate visitor badges with QR codes
    public GeneratedBarcode CreateVisitorBadgeQR(VisitorInfo visitor)
    {
        // Encode visitor information with expiration
        var visitorData = new
        {
            Name = visitor.Name,
            Company = visitor.Company,
            Host = visitor.HostEmployee,
            ValidFrom = visitor.CheckInTime,
            ValidUntil = visitor.CheckInTime.AddHours(8),
            AccessLevel = visitor.AccessLevel,
            BadgeId = Guid.NewGuid().ToString()
        };

        var qrCode = QRCodeWriter.CreateQrCode(
            JsonSerializer.Serialize(visitorData), 
            400, 
            QRCodeWriter.QrErrorCorrectionLevel.Medium
        );

        // Add company logo for professional appearance
        if (File.Exists("company-logo.png"))
        {
            qrCode.AddLogo("company-logo.png");
        }

        // Style for badge printing
        qrCode.SetMargins(15);
        qrCode.ChangeBarCodeColor(Color.FromArgb(0, 48, 135)); // Company blue

        // Add visible text for security personnel
        qrCode.AddAnnotationTextAboveBarcode($"VISITOR: {visitor.Name}");
        qrCode.AddAnnotationTextBelowBarcode($"Expires: {visitor.CheckInTime.AddHours(8):HH:mm}");

        _logger.LogInformation($"Generated visitor badge for {visitor.Name}, BadgeId: {visitorData.BadgeId}");

        return qrCode;
    }

    // Generate shipping labels with multiple barcodes
    public byte[] GenerateShippingLabel(ShippingInfo shipping)
    {
        // Create a PDF with multiple barcodes
        var pdf = new IronPdf.ChromePdfRenderer();

        // Generate tracking barcode (Code 128 for USPS/UPS compatibility)
        var trackingBarcode = BarcodeWriter.CreateBarcode(
            shipping.TrackingNumber, 
            BarcodeEncoding.Code128
        );
        trackingBarcode.ResizeTo(300, 75);
        trackingBarcode.SetMargins(5);

        // Generate postal code barcode
        var postalBarcode = BarcodeWriter.CreateBarcode(
            shipping.PostalCode,
            BarcodeEncoding.Code128
        );
        postalBarcode.ResizeTo(200, 50);

        // Generate QR code with complete shipping data
        var shippingData = JsonSerializer.Serialize(shipping);
        var qrCode = QRCodeWriter.CreateQrCode(shippingData, 200);

        // Combine into shipping label HTML
        var labelHtml = $@
        <html>
        <body style='font-family: Arial, sans-serif;'>
            <div style='border: 2px solid black; padding: 20px; width: 4in; height: 6in;'>
                <h2>SHIPPING LABEL</h2>
                <hr/>
                <p><strong>From:</strong><br/>{shipping.SenderAddress}</p>
                <p><strong>To:</strong><br/>{shipping.RecipientAddress}</p>
                <hr/>
                <div style='text-align: center;'>
                    <img src='{trackingBarcode.ToDataUrl()}' alt='Tracking barcode'/>
                    <p>Tracking: {shipping.TrackingNumber}</p>
                </div>
                <div style='margin-top: 20px;'>
                    <img src='{postalBarcode.ToDataUrl()}' alt='Postal barcode' style='float: left;'/>
                    <img src='{qrCode.ToDataUrl()}' alt='Shipping QR code' style='float: right; width: 100px;'/>
                </div>
                <div style='clear: both; margin-top: 20px; font-size: 10px;'>
                    <p>Service: {shipping.ServiceType} | Weight: {shipping.Weight}lbs</p>
                </div>
            </div>
        </body>
        </html>";

        return pdf.RenderHtmlAsPdf(labelHtml).BinaryData;
    }

    // Generate secure document QR codes with encryption
    public class SecureDocumentQR
    {
        private readonly byte[] _encryptionKey;

        public SecureDocumentQR(byte[] encryptionKey)
        {
            _encryptionKey = encryptionKey;
        }

        public GeneratedBarcode GenerateSecureDocumentQR(DocumentInfo document)
        {
            // Create document reference with security features
            var documentRef = new
            {
                DocumentId = document.Id,
                Type = document.DocumentType,
                CreatedDate = document.CreatedDate,
                Hash = ComputeDocumentHash(document),
                AccessUrl = "___PROTECTED_URL_46___",
                ValidUntil = DateTime.UtcNow.AddDays(30)
            };

            // Encrypt sensitive data
            var jsonData = JsonSerializer.Serialize(documentRef);
            var encryptedData = EncryptData(jsonData);

            // Generate QR with encrypted payload
            var qrCode = QRCodeWriter.CreateQrCode(
                Convert.ToBase64String(encryptedData),
                500,
                QRCodeWriter.QrErrorCorrectionLevel.High
            );

            // Add visual security indicators
            qrCode.ChangeBarCodeColor(Color.DarkGreen);
            qrCode.AddAnnotationTextAboveBarcode("SECURE DOCUMENT");
            qrCode.AddAnnotationTextBelowBarcode($"Expires: {documentRef.ValidUntil:yyyy-MM-dd}");

            return qrCode;
        }

        private string ComputeDocumentHash(DocumentInfo document)
        {
            using var sha256 = SHA256.Create();
            var hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(document.Content ?? document.Id));
            return BitConverter.ToString(hash).Replace("-", "");
        }

        private byte[] EncryptData(string data)
        {
            // Simplified encryption - use proper encryption in production
            using var aes = Aes.Create();
            aes.Key = _encryptionKey;
            aes.GenerateIV();

            using var encryptor = aes.CreateEncryptor();
            var dataBytes = Encoding.UTF8.GetBytes(data);
            var encrypted = encryptor.TransformFinalBlock(dataBytes, 0, dataBytes.Length);

            // Prepend IV for decryption
            return aes.IV.Concat(encrypted).ToArray();
        }
    }

    // Batch generation for high-volume scenarios
    public async Task<List<GeneratedBarcode>> GenerateBatchQRCodesAsync(List<string> data, QRCodeOptions options)
    {
        var tasks = data.Select(item => Task.Run(() =>
        {
            var qr = QRCodeWriter.CreateQrCode(
                item, 
                options.Size, 
                options.ErrorCorrection
            );

            if (options.IncludeMargins)
                qr.SetMargins(options.MarginSize);

            if (options.CustomColor.HasValue)
                qr.ChangeBarCodeColor(options.CustomColor.Value);

            return qr;
        }));

        return (await Task.WhenAll(tasks)).ToList();
    }
}

// Supporting models
public class AssetInfo
{
    public string AssetId { get; set; }
    public string AssetType { get; set; }
    public string CurrentLocation { get; set; }
    public DateTime LastMaintenanceDate { get; set; }
}

public class VisitorInfo
{
    public string Name { get; set; }
    public string Company { get; set; }
    public string HostEmployee { get; set; }
    public DateTime CheckInTime { get; set; }
    public string AccessLevel { get; set; }
}

public class ShippingInfo
{
    public string TrackingNumber { get; set; }
    public string SenderAddress { get; set; }
    public string RecipientAddress { get; set; }
    public string PostalCode { get; set; }
    public string ServiceType { get; set; }
    public decimal Weight { get; set; }
}

public class DocumentInfo
{
    public string Id { get; set; }
    public string DocumentType { get; set; }
    public DateTime CreatedDate { get; set; }
    public string Content { get; set; }
}

public class QRCodeOptions
{
    public int Size { get; set; } = 400;
    public QRCodeWriter.QrErrorCorrectionLevel ErrorCorrection { get; set; } = QRCodeWriter.QrErrorCorrectionLevel.Medium;
    public bool IncludeMargins { get; set; } = true;
    public int MarginSize { get; set; } = 10;
    public Color? CustomColor { get; set; }
}

public class BarcodeGenerationService
{
    private readonly ILogger<BarcodeGenerationService> _logger;

    // Generate QR codes for asset tracking
    public byte[] GenerateAssetQRCode(AssetInfo asset)
    {
        // Create JSON payload with asset information
        var assetData = JsonSerializer.Serialize(new
        {
            Id = asset.AssetId,
            Type = asset.AssetType,
            Location = asset.CurrentLocation,
            LastMaintenance = asset.LastMaintenanceDate,
            Url = "___PROTECTED_URL_45___"
        });

        // Generate QR code with high error correction for durability
        var qrCode = QRCodeWriter.CreateQrCode(assetData, 500, QRCodeWriter.QrErrorCorrectionLevel.High);

        // Add company branding
        qrCode.AddAnnotationTextAboveBarcode($"ASSET: {asset.AssetId}");
        qrCode.AddAnnotationTextBelowBarcode(asset.AssetType);
        qrCode.SetMargins(10);

        // Style for printing on asset labels
        qrCode.ChangeBarCodeColor(Color.Black);
        qrCode.ChangeBackgroundColor(Color.White);

        return qrCode.ToStream().ToArray();
    }

    // Generate visitor badges with QR codes
    public GeneratedBarcode CreateVisitorBadgeQR(VisitorInfo visitor)
    {
        // Encode visitor information with expiration
        var visitorData = new
        {
            Name = visitor.Name,
            Company = visitor.Company,
            Host = visitor.HostEmployee,
            ValidFrom = visitor.CheckInTime,
            ValidUntil = visitor.CheckInTime.AddHours(8),
            AccessLevel = visitor.AccessLevel,
            BadgeId = Guid.NewGuid().ToString()
        };

        var qrCode = QRCodeWriter.CreateQrCode(
            JsonSerializer.Serialize(visitorData), 
            400, 
            QRCodeWriter.QrErrorCorrectionLevel.Medium
        );

        // Add company logo for professional appearance
        if (File.Exists("company-logo.png"))
        {
            qrCode.AddLogo("company-logo.png");
        }

        // Style for badge printing
        qrCode.SetMargins(15);
        qrCode.ChangeBarCodeColor(Color.FromArgb(0, 48, 135)); // Company blue

        // Add visible text for security personnel
        qrCode.AddAnnotationTextAboveBarcode($"VISITOR: {visitor.Name}");
        qrCode.AddAnnotationTextBelowBarcode($"Expires: {visitor.CheckInTime.AddHours(8):HH:mm}");

        _logger.LogInformation($"Generated visitor badge for {visitor.Name}, BadgeId: {visitorData.BadgeId}");

        return qrCode;
    }

    // Generate shipping labels with multiple barcodes
    public byte[] GenerateShippingLabel(ShippingInfo shipping)
    {
        // Create a PDF with multiple barcodes
        var pdf = new IronPdf.ChromePdfRenderer();

        // Generate tracking barcode (Code 128 for USPS/UPS compatibility)
        var trackingBarcode = BarcodeWriter.CreateBarcode(
            shipping.TrackingNumber, 
            BarcodeEncoding.Code128
        );
        trackingBarcode.ResizeTo(300, 75);
        trackingBarcode.SetMargins(5);

        // Generate postal code barcode
        var postalBarcode = BarcodeWriter.CreateBarcode(
            shipping.PostalCode,
            BarcodeEncoding.Code128
        );
        postalBarcode.ResizeTo(200, 50);

        // Generate QR code with complete shipping data
        var shippingData = JsonSerializer.Serialize(shipping);
        var qrCode = QRCodeWriter.CreateQrCode(shippingData, 200);

        // Combine into shipping label HTML
        var labelHtml = $@
        <html>
        <body style='font-family: Arial, sans-serif;'>
            <div style='border: 2px solid black; padding: 20px; width: 4in; height: 6in;'>
                <h2>SHIPPING LABEL</h2>
                <hr/>
                <p><strong>From:</strong><br/>{shipping.SenderAddress}</p>
                <p><strong>To:</strong><br/>{shipping.RecipientAddress}</p>
                <hr/>
                <div style='text-align: center;'>
                    <img src='{trackingBarcode.ToDataUrl()}' alt='Tracking barcode'/>
                    <p>Tracking: {shipping.TrackingNumber}</p>
                </div>
                <div style='margin-top: 20px;'>
                    <img src='{postalBarcode.ToDataUrl()}' alt='Postal barcode' style='float: left;'/>
                    <img src='{qrCode.ToDataUrl()}' alt='Shipping QR code' style='float: right; width: 100px;'/>
                </div>
                <div style='clear: both; margin-top: 20px; font-size: 10px;'>
                    <p>Service: {shipping.ServiceType} | Weight: {shipping.Weight}lbs</p>
                </div>
            </div>
        </body>
        </html>";

        return pdf.RenderHtmlAsPdf(labelHtml).BinaryData;
    }

    // Generate secure document QR codes with encryption
    public class SecureDocumentQR
    {
        private readonly byte[] _encryptionKey;

        public SecureDocumentQR(byte[] encryptionKey)
        {
            _encryptionKey = encryptionKey;
        }

        public GeneratedBarcode GenerateSecureDocumentQR(DocumentInfo document)
        {
            // Create document reference with security features
            var documentRef = new
            {
                DocumentId = document.Id,
                Type = document.DocumentType,
                CreatedDate = document.CreatedDate,
                Hash = ComputeDocumentHash(document),
                AccessUrl = "___PROTECTED_URL_46___",
                ValidUntil = DateTime.UtcNow.AddDays(30)
            };

            // Encrypt sensitive data
            var jsonData = JsonSerializer.Serialize(documentRef);
            var encryptedData = EncryptData(jsonData);

            // Generate QR with encrypted payload
            var qrCode = QRCodeWriter.CreateQrCode(
                Convert.ToBase64String(encryptedData),
                500,
                QRCodeWriter.QrErrorCorrectionLevel.High
            );

            // Add visual security indicators
            qrCode.ChangeBarCodeColor(Color.DarkGreen);
            qrCode.AddAnnotationTextAboveBarcode("SECURE DOCUMENT");
            qrCode.AddAnnotationTextBelowBarcode($"Expires: {documentRef.ValidUntil:yyyy-MM-dd}");

            return qrCode;
        }

        private string ComputeDocumentHash(DocumentInfo document)
        {
            using var sha256 = SHA256.Create();
            var hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(document.Content ?? document.Id));
            return BitConverter.ToString(hash).Replace("-", "");
        }

        private byte[] EncryptData(string data)
        {
            // Simplified encryption - use proper encryption in production
            using var aes = Aes.Create();
            aes.Key = _encryptionKey;
            aes.GenerateIV();

            using var encryptor = aes.CreateEncryptor();
            var dataBytes = Encoding.UTF8.GetBytes(data);
            var encrypted = encryptor.TransformFinalBlock(dataBytes, 0, dataBytes.Length);

            // Prepend IV for decryption
            return aes.IV.Concat(encrypted).ToArray();
        }
    }

    // Batch generation for high-volume scenarios
    public async Task<List<GeneratedBarcode>> GenerateBatchQRCodesAsync(List<string> data, QRCodeOptions options)
    {
        var tasks = data.Select(item => Task.Run(() =>
        {
            var qr = QRCodeWriter.CreateQrCode(
                item, 
                options.Size, 
                options.ErrorCorrection
            );

            if (options.IncludeMargins)
                qr.SetMargins(options.MarginSize);

            if (options.CustomColor.HasValue)
                qr.ChangeBarCodeColor(options.CustomColor.Value);

            return qr;
        }));

        return (await Task.WhenAll(tasks)).ToList();
    }
}

// Supporting models
public class AssetInfo
{
    public string AssetId { get; set; }
    public string AssetType { get; set; }
    public string CurrentLocation { get; set; }
    public DateTime LastMaintenanceDate { get; set; }
}

public class VisitorInfo
{
    public string Name { get; set; }
    public string Company { get; set; }
    public string HostEmployee { get; set; }
    public DateTime CheckInTime { get; set; }
    public string AccessLevel { get; set; }
}

public class ShippingInfo
{
    public string TrackingNumber { get; set; }
    public string SenderAddress { get; set; }
    public string RecipientAddress { get; set; }
    public string PostalCode { get; set; }
    public string ServiceType { get; set; }
    public decimal Weight { get; set; }
}

public class DocumentInfo
{
    public string Id { get; set; }
    public string DocumentType { get; set; }
    public DateTime CreatedDate { get; set; }
    public string Content { get; set; }
}

public class QRCodeOptions
{
    public int Size { get; set; } = 400;
    public QRCodeWriter.QrErrorCorrectionLevel ErrorCorrection { get; set; } = QRCodeWriter.QrErrorCorrectionLevel.Medium;
    public bool IncludeMargins { get; set; } = true;
    public int MarginSize { get; set; } = 10;
    public Color? CustomColor { get; set; }
}

Diese Generationsbeispiele veranschaulichen unternehmensspezifische Anwendungsfälle. Die QR-Codes zur Anlagenverfolgung enthalten die Wartungshistorie und direkte Links zu Anlagenverwaltungssystemen. Besucherausweise enthalten Ablaufdaten und Zugriffsebenen zur Einhaltung der Sicherheitsbestimmungen. Versandetiketten kombinieren mehrere Barcode-Formate, um den Anforderungen der Transportunternehmen gerecht zu werden.

Die Implementierung eines sicheren QR-Codes für Dokumente zeigt, wie die Verschlüsselung sensibler Daten integriert werden kann. Dieser Ansatz stellt sicher, dass selbst wenn jemand den QR-Code erfasst, er ohne die entsprechenden Entschlüsselungsschlüssel nicht auf die Informationen zugreifen kann. Dies erweist sich als unerlässlich für Compliance-Dokumente, Finanzunterlagen oder vertrauliche Mitteilungen.

Nächste Schritte für die Produktionsbereitstellung

Die Entwicklung einer Enterprise-Barcode-Scanner-API mit IronBarcode bietet eine zuverlässige Grundlage für Initiativen zur digitalen Transformation. Die Kombination aus vollständiger Formatunterstützung, fortschrittlicher Bildverarbeitung und plattformübergreifender Kompatibilität erfüllt die komplexen Anforderungen moderner Unternehmen.

Wichtigste Erkenntnisse für Ihre Umsetzung:

1. Sicherheit geht vor : Implementieren Sie von Anfang an eine ordnungsgemäße Authentifizierung, Eingabevalidierung und Protokollierung.
2. Leistungsoptimierung : Verwenden Sie für Ihren Anwendungsfall geeignete Scangeschwindigkeiten und Caching-Strategien.
3. Fehlerbehandlung : Robuste Systeme entwickeln, die Sonderfälle elegant behandeln und aussagekräftiges Feedback liefern.
4. Skalierbarkeit : Bei der Entwicklung sollte die horizontale Skalierbarkeit im Vordergrund stehen, unter Nutzung asynchroner Muster und effizienter Ressourcenverwaltung.

Für Produktionsumgebungen sollten Sie folgende zusätzliche Ressourcen in Betracht ziehen:

• Im Änderungsprotokoll finden Sie die neuesten Funktionen und Verbesserungen.
• Entdecken Sie neue Formatunterstützung, einschließlich spezialisierter Unternehmensformate
• Implementierung der MSI-Installer-Bereitstellung für Desktop-Anwendungen
• Lizenzschlüssel für Produktionsumgebungen ordnungsgemäß konfigurieren

Die Enterprise-Funktionen von IronBarcode gehen über das einfache Scannen hinaus. Die Anpassungsmöglichkeiten der Bibliothek ermöglichen die Generierung von markenspezifischen Barcodes. Die Unterstützung von Unicode-Barcodes gewährleistet globale Kompatibilität. Erweiterte Funktionen wie Barcode-Ränder und Fehlerkorrekturstufen ermöglichen eine detaillierte Kontrolle über die Ausgabequalität.