How to Read QR Codes from Images in C

// Example: Reading QR碼s with enhanced error correction
using IronBarcode;

public class EnhancedQRReader
{
    public static void ReadPoorQualityImage()
    {
        // Configure reader with multiple attempts and error correction
        var options = new BarcodeReaderOptions
        {
            Speed = ReadingSpeed.Detailed, // More thorough scanning
            ExpectMultipleBarcodes = true,  // Check for multiple codes
            ExpectBarcodeTypes = BarcodeType.QRCode // Focus on QR碼s only
        };

        using (var inputImage = Image.FromFile("blurry_qr_code.jpg"))
        {
            var qrImageInput = new QrImageInput(inputImage);
            var results = BarcodeReader.Read(qrImageInput, options);

            foreach (var result in results.Barcodes)
            {
                Console.WriteLine($"Decoded: {result.Value}");
                Console.WriteLine($"Confidence: {result.Confidence}%");
            }
        }
    }
}

Imports IronBarcode

Public Class EnhancedQRReader
    Public Shared Sub ReadPoorQualityImage()
        ' Configure reader with multiple attempts and error correction
        Dim options As New BarcodeReaderOptions With {
            .Speed = ReadingSpeed.Detailed, ' More thorough scanning
            .ExpectMultipleBarcodes = True, ' Check for multiple codes
            .ExpectBarcodeTypes = BarcodeType.QRCode ' Focus on QR碼s only
        }

        Using inputImage = Image.FromFile("blurry_qr_code.jpg")
            Dim qrImageInput As New QrImageInput(inputImage)
            Dim results = BarcodeReader.Read(qrImageInput, options)

            For Each result In results.Barcodes
                Console.WriteLine($"Decoded: {result.Value}")
                Console.WriteLine($"Confidence: {result.Confidence}%")
            Next
        End Using
    End Sub
End Class

using IronBarcode;
using IronSoftware.Drawing;

public class MultiTypeQRReader
{
    public static void ReadVariousQRTypes()
    {
        // Configure reader to handle all QR碼 types
        var options = new BarcodeReaderOptions
        {
            ExpectBarcodeTypes = BarcodeType.QRCode | 
                                BarcodeType.MicroQRCode | 
                                BarcodeType.RectangularMicroQRCode
        };

        string[] imagePaths = {
            "standard_qr.png",
            "micro_qr.png", 
            "rectangular_qr.png"
        };

        foreach (var path in imagePaths)
        {
            using (var image = Image.FromFile(path))
            {
                var qrInput = new QrImageInput(image);
                var results = BarcodeReader.Read(qrInput, options);

                foreach (var qr in results.Barcodes)
                {
                    Console.WriteLine($"Type: {qr.BarcodeType}");
                    Console.WriteLine($"Data: {qr.Value}");
                    Console.WriteLine($"Format: {qr.Format}");
                    Console.WriteLine("---");
                }
            }
        }
    }
}

Imports IronBarcode
Imports IronSoftware.Drawing

Public Class MultiTypeQRReader
    Public Shared Sub ReadVariousQRTypes()
        ' Configure reader to handle all QR碼 types
        Dim options As New BarcodeReaderOptions With {
            .ExpectBarcodeTypes = BarcodeType.QRCode Or
                                  BarcodeType.MicroQRCode Or
                                  BarcodeType.RectangularMicroQRCode
        }

        Dim imagePaths As String() = {
            "standard_qr.png",
            "micro_qr.png",
            "rectangular_qr.png"
        }

        For Each path In imagePaths
            Using image = Image.FromFile(path)
                Dim qrInput As New QrImageInput(image)
                Dim results = BarcodeReader.Read(qrInput, options)

                For Each qr In results.Barcodes
                    Console.WriteLine($"Type: {qr.BarcodeType}")
                    Console.WriteLine($"Data: {qr.Value}")
                    Console.WriteLine($"Format: {qr.Format}")
                    Console.WriteLine("---")
                Next
            End Using
        Next
    End Sub
End Class