// ZXing.Net: a new reader instance is created per iteration
Parallel.ForEach(imagePaths, path =>
{
    var reader = new BarcodeReader();
    reader.Options.PossibleFormats = new List<BarcodeFormat>
    {
        BarcodeFormat.QR_CODE,
        BarcodeFormat.CODE_128,
        BarcodeFormat.EAN_13
    };

    using var bitmap = new Bitmap(path);
    var result = reader.Decode(bitmap);

    if (result != null)
        results[path] = result.Text;
});

Imports System.Collections.Concurrent
Imports System.Drawing
Imports ZXing

Parallel.ForEach(imagePaths, Sub(path)
    Dim reader = New BarcodeReader()
    reader.Options.PossibleFormats = New List(Of BarcodeFormat) From {
        BarcodeFormat.QR_CODE,
        BarcodeFormat.CODE_128,
        BarcodeFormat.EAN_13
    }

    Using bitmap As New Bitmap(path)
        Dim result = reader.Decode(bitmap)

        If result IsNot Nothing Then
            results(path) = result.Text
        End If
    End Using
End Sub)

// ZXing.Net: one reader instance per parallel operation
Parallel.ForEach(imagePaths, path =>
{
    var reader = new BarcodeReader();
    reader.Options.PossibleFormats = new List<BarcodeFormat>
    {
        BarcodeFormat.QR_CODE,
        BarcodeFormat.CODE_128,
        BarcodeFormat.EAN_13
    };

    using var bitmap = new Bitmap(path);
    var result = reader.Decode(bitmap);

    if (result != null)
        results[path] = result.Text;
});

Imports System.Collections.Concurrent
Imports System.Drawing
Imports ZXing

Parallel.ForEach(imagePaths, Sub(path)
    Dim reader As New BarcodeReader()
    reader.Options.PossibleFormats = New List(Of BarcodeFormat) From {
        BarcodeFormat.QR_CODE,
        BarcodeFormat.CODE_128,
        BarcodeFormat.EAN_13
    }

    Using bitmap As New Bitmap(path)
        Dim result = reader.Decode(bitmap)

        If result IsNot Nothing Then
            results(path) = result.Text
        End If
    End Using
End Sub)

// IronBarcode: static method — no instance management
var options = new BarcodeReaderOptions
{
    Speed = ReadingSpeed.Balanced,
    ExpectMultipleBarcodes = true,
    MaxParallelThreads = 4
};

Parallel.ForEach(imagePaths, path =>
{
    var result = BarcodeReader.Read(path, options).FirstOrDefault();
    if (result != null)
        results[path] = result.Value;
});

Imports IronBarcode

Dim options As New BarcodeReaderOptions With {
    .Speed = ReadingSpeed.Balanced,
    .ExpectMultipleBarcodes = True,
    .MaxParallelThreads = 4
}

Parallel.ForEach(imagePaths, Sub(path)
    Dim result = BarcodeReader.Read(path, options).FirstOrDefault()
    If result IsNot Nothing Then
        results(path) = result.Value
    End If
End Sub)

// ZXing.Net: PossibleFormats list controls which symbologies are decoded
var reader = new BarcodeReader();
reader.Options.PossibleFormats = new List<BarcodeFormat>
{
    BarcodeFormat.QR_CODE,
    BarcodeFormat.CODE_128,
    BarcodeFormat.CODE_39,
    BarcodeFormat.EAN_13,
    BarcodeFormat.EAN_8,
    BarcodeFormat.UPC_A,
    BarcodeFormat.DATA_MATRIX,
    BarcodeFormat.PDF_417
};
reader.Options.TryHarder = true;

using var bitmap = new Bitmap(imagePath);
var results = reader.DecodeMultiple(bitmap);

Imports ZXing
Imports ZXing.Common

' ZXing.Net: PossibleFormats list controls which symbologies are decoded
Dim reader As New BarcodeReader()
reader.Options.PossibleFormats = New List(Of BarcodeFormat) From {
    BarcodeFormat.QR_CODE,
    BarcodeFormat.CODE_128,
    BarcodeFormat.CODE_39,
    BarcodeFormat.EAN_13,
    BarcodeFormat.EAN_8,
    BarcodeFormat.UPC_A,
    BarcodeFormat.DATA_MATRIX,
    BarcodeFormat.PDF_417
}
reader.Options.TryHarder = True

Using bitmap As New Bitmap(imagePath)
    Dim results = reader.DecodeMultiple(bitmap)
End Using

// IronBarcode: automatic detection across all supported formats
var results = BarcodeReader.Read(imagePath);
foreach (var barcode in results)
{
    Console.WriteLine($"{barcode.Value} ({barcode.Format})");
}

Imports IronBarcode

' IronBarcode: automatic detection across all supported formats
Dim results = BarcodeReader.Read(imagePath)
For Each barcode In results
    Console.WriteLine($"{barcode.Value} ({barcode.Format})")
Next

// ZXing.Net: PDF input is handled by PdfiumViewer with a per-page render loop
using var pdfDocument = PdfDocument.Load(pdfPath);

var reader = new BarcodeReader();
reader.Options.PossibleFormats = new List<BarcodeFormat>
{
    BarcodeFormat.QR_CODE,
    BarcodeFormat.CODE_128,
    BarcodeFormat.PDF_417
};

for (int i = 0; i < pdfDocument.PageCount; i++)
{
    string tempPath = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}.png");
    try
    {
        using var pageImage = pdfDocument.Render(i, 200, 200, PdfRenderFlags.CorrectFromDpi);
        pageImage.Save(tempPath, ImageFormat.Png);

        using var bitmap = new Bitmap(tempPath);
        var decoded = reader.DecodeMultiple(bitmap);
        if (decoded != null)
            results.AddRange(decoded.Select(d => d.Text));
    }
    finally
    {
        File.Delete(tempPath);
    }
}

Imports System.IO
Imports System.Drawing
Imports PdfiumViewer
Imports ZXing
Imports ZXing.Common

' ZXing.Net: PDF input is handled by PdfiumViewer with a per-page render loop
Using pdfDocument As PdfDocument = PdfDocument.Load(pdfPath)

    Dim reader As New BarcodeReader()
    reader.Options.PossibleFormats = New List(Of BarcodeFormat) From {
        BarcodeFormat.QR_CODE,
        BarcodeFormat.CODE_128,
        BarcodeFormat.PDF_417
    }

    For i As Integer = 0 To pdfDocument.PageCount - 1
        Dim tempPath As String = Path.Combine(Path.GetTempPath(), $"{Guid.NewGuid()}.png")
        Try
            Using pageImage As Image = pdfDocument.Render(i, 200, 200, PdfRenderFlags.CorrectFromDpi)
                pageImage.Save(tempPath, Imaging.ImageFormat.Png)

                Using bitmap As New Bitmap(tempPath)
                    Dim decoded = reader.DecodeMultiple(bitmap)
                    If decoded IsNot Nothing Then
                        results.AddRange(decoded.Select(Function(d) d.Text))
                    End If
                End Using
            End Using
        Finally
            File.Delete(tempPath)
        End Try
    Next
End Using

// IronBarcode: one call processes every page of the PDF
var results = BarcodeReader.Read("invoice.pdf");
foreach (var barcode in results)
    Console.WriteLine($"Page {barcode.PageNumber}: {barcode.Value}");

Imports IronBarcode

' IronBarcode: one call processes every page of the PDF
Dim results = BarcodeReader.Read("invoice.pdf")
For Each barcode In results
    Console.WriteLine($"Page {barcode.PageNumber}: {barcode.Value}")
Next

// Windows binding path — uses System.Drawing
using ZXing.Windows.Compatibility;
using System.Drawing;

var reader = new BarcodeReader();
using var bitmap = new Bitmap(imagePath);
var result = reader.Decode(bitmap);

Imports ZXing.Windows.Compatibility
Imports System.Drawing

Dim reader As New BarcodeReader()
Using bitmap As New Bitmap(imagePath)
    Dim result = reader.Decode(bitmap)
End Using

// Cross-platform path — different package, different API
using ZXing.ImageSharp;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;

var reader = new BarcodeReader<Rgba32>();
using var image = Image.Load<Rgba32>(imagePath);
var result = reader.Decode(image);

Imports ZXing.ImageSharp
Imports SixLabors.ImageSharp
Imports SixLabors.ImageSharp.PixelFormats

Dim reader As New BarcodeReader(Of Rgba32)()
Using image As Image(Of Rgba32) = Image.Load(Of Rgba32)(imagePath)
    Dim result = reader.Decode(image)
End Using

// ZXing.Net: create writer, set options, call Write, save Bitmap
using ZXing;
using ZXing.Common;
using ZXing.Windows.Compatibility;
using System.Drawing.Imaging;

var writer = new BarcodeWriter
{
    Format = BarcodeFormat.CODE_128,
    Options = new EncodingOptions
    {
        Width = 300,
        Height = 100,
        Margin = 10
    }
};

using var bitmap = writer.Write("PRODUCT-001");
bitmap.Save("output.png", ImageFormat.Png);

Imports ZXing
Imports ZXing.Common
Imports ZXing.Windows.Compatibility
Imports System.Drawing.Imaging

Dim writer As New BarcodeWriter With {
    .Format = BarcodeFormat.CODE_128,
    .Options = New EncodingOptions With {
        .Width = 300,
        .Height = 100,
        .Margin = 10
    }
}

Using bitmap = writer.Write("PRODUCT-001")
    bitmap.Save("output.png", ImageFormat.Png)
End Using

// IronBarcode: create and save in one fluent chain
BarcodeWriter.CreateBarcode("PRODUCT-001", BarcodeEncoding.Code128)
    .ResizeTo(300, 100)
    .SaveAsPng("output.png");

Imports IronBarCode

' IronBarcode: create and save in one fluent chain
BarcodeWriter.CreateBarcode("PRODUCT-001", BarcodeEncoding.Code128) _
    .ResizeTo(300, 100) _
    .SaveAsPng("output.png")