C# Barcode Scanner: Read Barcodes & QR Codes in .NET Applications

using IronBarCode;

// The Multithreaded property allows for faster barcode scanning across multiple images or PDFs. All threads are automatically managed by IronBarCode.
var ListOfDocuments = new[] { "image1.png", "image2.JPG", "image3.pdf" };

BarcodeReaderOptions options = new BarcodeReaderOptions()
{
    // Enable multithreading
    Multithreaded = true,
};

BarcodeResults batchResults = BarcodeReader.Read(ListOfDocuments, options);

Imports IronBarCode

' The Multithreaded property allows for faster barcode scanning across multiple images or PDFs. All threads are automatically managed by IronBarCode.
Private ListOfDocuments = { "image1.png", "image2.JPG", "image3.pdf" }

Private options As New BarcodeReaderOptions() With {.Multithreaded = True}

Private batchResults As BarcodeResults = BarcodeReader.Read(ListOfDocuments, options)

// Read only specific pages to improve performance
BarcodeReaderOptions pdfOptions = new BarcodeReaderOptions
{
    // Scan pages 1-5 only
    PageNumbers = new[] { 1, 2, 3, 4, 5 },
    
    // PDF-specific settings
    PdfDpi = 300, // Higher DPI for better accuracy
    ReadBehindVectorGraphics = true
};

BarcodeResults results = BarcodeReader.ReadPdf("document.pdf", pdfOptions);

Imports System

' Read only specific pages to improve performance
Dim pdfOptions As New BarcodeReaderOptions With {
    ' Scan pages 1-5 only
    .PageNumbers = New Integer() {1, 2, 3, 4, 5},
    
    ' PDF-specific settings
    .PdfDpi = 300, ' Higher DPI for better accuracy
    .ReadBehindVectorGraphics = True
}

Dim results As BarcodeResults = BarcodeReader.ReadPdf("document.pdf", pdfOptions)

using IronBarCode;

// TIFF files are processed similarly to regular images
// Each frame is scanned automatically
BarcodeResults multiFrameResults = BarcodeReader.Read("Multiframe.tiff");

foreach (var result in multiFrameResults)
{
    // Access frame-specific information
    int frameNumber = result.PageNumber; // Frame number in TIFF
    string barcodeValue = result.Text;
    
    Console.WriteLine($"Frame {frameNumber}: {barcodeValue}");
    
    // Save individual barcode images if needed
    result.BarcodeImage?.Save($"barcode_frame_{frameNumber}.png");
}

Imports IronBarCode

' TIFF files are processed similarly to regular images
' Each frame is scanned automatically
Dim multiFrameResults As BarcodeResults = BarcodeReader.Read("Multiframe.tiff")

For Each result In multiFrameResults
    ' Access frame-specific information
    Dim frameNumber As Integer = result.PageNumber ' Frame number in TIFF
    Dim barcodeValue As String = result.Text

    Console.WriteLine($"Frame {frameNumber}: {barcodeValue}")

    ' Save individual barcode images if needed
    result.BarcodeImage?.Save($"barcode_frame_{frameNumber}.png")
Next

using IronBarCode;

// List of documents to process - mix of formats supported
var documentBatch = new[] 
{ 
    "invoice1.pdf", 
    "shipping_label.png", 
    "inventory_sheet.tiff",
    "product_catalog.pdf"
};

// Configure for batch processing
BarcodeReaderOptions batchOptions = new BarcodeReaderOptions
{
    // Enable parallel processing across documents
    Multithreaded = true,
    
    // Limit threads if needed (0 = use all cores)
    MaxParallelThreads = Environment.ProcessorCount,
    
    // Apply consistent settings to all documents
    Speed = ReadingSpeed.Balanced,
    ExpectBarcodeTypes = BarcodeEncoding.All
};

// Process all documents in parallel
BarcodeResults batchResults = BarcodeReader.Read(documentBatch, batchOptions);

// Group results by source document
var resultsByDocument = batchResults.GroupBy(r => r.Filename);

foreach (var docGroup in resultsByDocument)
{
    Console.WriteLine($"\nDocument: {docGroup.Key}");
    foreach (var barcode in docGroup)
    {
        Console.WriteLine($"  - {barcode.BarcodeType}: {barcode.Text}");
    }
}

Imports IronBarCode

' List of documents to process - mix of formats supported
Dim documentBatch = New String() {
    "invoice1.pdf",
    "shipping_label.png",
    "inventory_sheet.tiff",
    "product_catalog.pdf"
}

' Configure for batch processing
Dim batchOptions As New BarcodeReaderOptions With {
    .Multithreaded = True,
    .MaxParallelThreads = Environment.ProcessorCount,
    .Speed = ReadingSpeed.Balanced,
    .ExpectBarcodeTypes = BarcodeEncoding.All
}

' Process all documents in parallel
Dim batchResults As BarcodeResults = BarcodeReader.Read(documentBatch, batchOptions)

' Group results by source document
Dim resultsByDocument = batchResults.GroupBy(Function(r) r.Filename)

For Each docGroup In resultsByDocument
    Console.WriteLine(vbCrLf & "Document: " & docGroup.Key)
    For Each barcode In docGroup
        Console.WriteLine($"  - {barcode.BarcodeType}: {barcode.Text}")
    Next
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