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

using System;
using IronBarCode;

try
{
    // Scan all pages of a PDF for barcodes
    BarcodeResults results = BarcodeReader.ReadPdf("MultipleBarcodes.pdf");

    if (results != null && results.Count > 0)
    {
        foreach (var barcode in results)
        {
            // Access barcode data and metadata
            string value = barcode.Text;
            int pageNumber = barcode.PageNumber;
            BarcodeEncoding format = barcode.BarcodeType;
            byte[] binaryData = barcode.BinaryValue;

            // Extract barcode image if needed
            System.Drawing.Bitmap barcodeImage = barcode.BarcodeImage;

            Console.WriteLine($"Found {format} on page {pageNumber}: {value}");
        }
    }
    else
    {
        Console.WriteLine("No barcodes found in the PDF.");
    }
}
catch (Exception ex)
{
    Console.WriteLine($"Error reading PDF: {ex.Message}");
}

Imports System
Imports IronBarCode

Try
	' Scan all pages of a PDF for barcodes
	Dim results As BarcodeResults = BarcodeReader.ReadPdf("MultipleBarcodes.pdf")

	If results IsNot Nothing AndAlso results.Count > 0 Then
		For Each barcode In results
			' Access barcode data and metadata
			Dim value As String = barcode.Text
			Dim pageNumber As Integer = barcode.PageNumber
			Dim format As BarcodeEncoding = barcode.BarcodeType
			Dim binaryData() As Byte = barcode.BinaryValue

			' Extract barcode image if needed
			Dim barcodeImage As System.Drawing.Bitmap = barcode.BarcodeImage

			Console.WriteLine($"Found {format} on page {pageNumber}: {value}")
		Next barcode
	Else
		Console.WriteLine("No barcodes found in the PDF.")
	End If
Catch ex As Exception
	Console.WriteLine($"Error reading PDF: {ex.Message}")
End Try

// 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);

' Read only specific pages to improve performance
Dim pdfOptions As New BarcodeReaderOptions With {
	.PageNumbers = { 1, 2, 3, 4, 5 },
	.PdfDpi = 300,
	.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
Private 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
	If result.BarcodeImage IsNot Nothing Then
		result.BarcodeImage.Save($"barcode_frame_{frameNumber}.png")
	End If
Next result

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 Microsoft.VisualBasic
Imports IronBarCode

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

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

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

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

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