C#でQRコードを生成する - .NET開発者向け完全チュートリアル

using IronBarCode;

// Generate a QR code with text content
var qrCode = QRCodeWriter.CreateQrCode("hello world", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium);
qrCode.SaveAsPng("MyQR.png");

Imports IronBarCode

' Generate a QR code with text content
Private qrCode = QRCodeWriter.CreateQrCode("hello world", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium)
qrCode.SaveAsPng("MyQR.png")

using IronBarCode;
using IronSoftware.Drawing;

// Load logo image
QRCodeLogo qrCodeLogo = new QRCodeLogo("visual-studio-logo.png");

// Create QR code with embedded logo
GeneratedBarcode myQRCodeWithLogo = QRCodeWriter.CreateQrCodeWithLogo("https://ironsoftware.com/", qrCodeLogo);

// Customize appearance
myQRCodeWithLogo.ResizeTo(500, 500).SetMargins(10).ChangeBarCodeColor(Color.DarkGreen);

// Save the branded QR code
myQRCodeWithLogo.SaveAsPng("myQRWithLogo.png");

Imports IronBarCode
Imports IronSoftware.Drawing

' Load logo image
Private qrCodeLogo As New QRCodeLogo("visual-studio-logo.png")

' Create QR code with embedded logo
Private myQRCodeWithLogo As GeneratedBarcode = QRCodeWriter.CreateQrCodeWithLogo("https://ironsoftware.com/", qrCodeLogo)

' Customize appearance
myQRCodeWithLogo.ResizeTo(500, 500).SetMargins(10).ChangeBarCodeColor(Color.DarkGreen)

' Save the branded QR code
myQRCodeWithLogo.SaveAsPng("myQRWithLogo.png")

using IronBarCode;
using System.Drawing;

// Create QR code with logo
QRCodeLogo qrCodeLogo = new QRCodeLogo("visual-studio-logo.png");
GeneratedBarcode myQRCodeWithLogo = QRCodeWriter.CreateQrCodeWithLogo("https://ironsoftware.com/", qrCodeLogo);

// Apply custom styling
myQRCodeWithLogo.ChangeBarCodeColor(Color.DarkGreen);

// Export to multiple formats
myQRCodeWithLogo.SaveAsPdf("MyQRWithLogo.pdf");      // PDF document
myQRCodeWithLogo.SaveAsHtmlFile("MyQRWithLogo.html"); // Standalone HTML
myQRCodeWithLogo.SaveAsPng("MyQRWithLogo.png");       // PNG image
myQRCodeWithLogo.SaveAsJpeg("MyQRWithLogo.jpg");      // JPEG image

Imports IronBarCode
Imports System.Drawing

' Create QR code with logo
Private qrCodeLogo As New QRCodeLogo("visual-studio-logo.png")
Private myQRCodeWithLogo As GeneratedBarcode = QRCodeWriter.CreateQrCodeWithLogo("https://ironsoftware.com/", qrCodeLogo)

' Apply custom styling
myQRCodeWithLogo.ChangeBarCodeColor(Color.DarkGreen)

' Export to multiple formats
myQRCodeWithLogo.SaveAsPdf("MyQRWithLogo.pdf") ' PDF document
myQRCodeWithLogo.SaveAsHtmlFile("MyQRWithLogo.html") ' Standalone HTML
myQRCodeWithLogo.SaveAsPng("MyQRWithLogo.png") ' PNG image
myQRCodeWithLogo.SaveAsJpeg("MyQRWithLogo.jpg") ' JPEG image

using IronBarCode;
using IronSoftware.Drawing;
using System;
using System.Drawing;

// Generate QR code with logo
QRCodeLogo qrCodeLogo = new QRCodeLogo("visual-studio-logo.png");
GeneratedBarcode myVerifiedQR = QRCodeWriter.CreateQrCodeWithLogo("https://ironsoftware.com/", qrCodeLogo);

// Apply light color (may affect readability)
myVerifiedQR.ChangeBarCodeColor(Color.LightBlue);

// Verify the QR code can still be scanned
if (!myVerifiedQR.Verify())
{
    Console.WriteLine("LightBlue is not dark enough to be read accurately. Let's try DarkBlue");
    myVerifiedQR.ChangeBarCodeColor(Color.DarkBlue);
}

// Save verified QR code
myVerifiedQR.SaveAsHtmlFile("MyVerifiedQR.html");

Imports IronBarCode
Imports IronSoftware.Drawing
Imports System
Imports System.Drawing

' Generate QR code with logo
Dim qrCodeLogo As New QRCodeLogo("visual-studio-logo.png")
Dim myVerifiedQR As GeneratedBarcode = QRCodeWriter.CreateQrCodeWithLogo("https://ironsoftware.com/", qrCodeLogo)

' Apply light color (may affect readability)
myVerifiedQR.ChangeBarCodeColor(Color.LightBlue)

' Verify the QR code can still be scanned
If Not myVerifiedQR.Verify() Then
    Console.WriteLine("LightBlue is not dark enough to be read accurately. Let's try DarkBlue")
    myVerifiedQR.ChangeBarCodeColor(Color.DarkBlue)
End If

' Save verified QR code
myVerifiedQR.SaveAsHtmlFile("MyVerifiedQR.html")

using IronBarCode;
using System;
using System.Linq;

// Convert string to binary data
byte[] binaryData = System.Text.Encoding.UTF8.GetBytes("https://ironsoftware.com/csharp/barcode/");

// Create QR code from binary content
QRCodeWriter.CreateQrCode(binaryData, 500).SaveAsPng("MyBinaryQR.png");

// Read and verify binary data integrity
var myReturnedData = BarcodeReader.Read("MyBinaryQR.png").First();

// Confirm data matches original
if (binaryData.SequenceEqual(myReturnedData.BinaryValue))
{
    Console.WriteLine("Binary Data Read and Written Perfectly");
}
else
{
    throw new Exception("Data integrity check failed");
}

Imports IronBarCode
Imports System
Imports System.Linq

' Convert string to binary data
Private binaryData() As Byte = System.Text.Encoding.UTF8.GetBytes("https://ironsoftware.com/csharp/barcode/")

' Create QR code from binary content
QRCodeWriter.CreateQrCode(binaryData, 500).SaveAsPng("MyBinaryQR.png")

' Read and verify binary data integrity
Dim myReturnedData = BarcodeReader.Read("MyBinaryQR.png").First()

' Confirm data matches original
If binaryData.SequenceEqual(myReturnedData.BinaryValue) Then
	Console.WriteLine("Binary Data Read and Written Perfectly")
Else
	Throw New Exception("Data integrity check failed")
End If

using IronBarCode;
using System;
using System.Linq;

// Read QR code with optimized settings
BarcodeResults result = BarcodeReader.Read("QR.png", new BarcodeReaderOptions() { 
    ExpectBarcodeTypes = BarcodeEncoding.QRCode 
});

// Extract and display the decoded value
if (result != null && result.Any())
{
    Console.WriteLine(result.First().Value);
}
else
{
    Console.WriteLine("No QR codes found in the image.");
}

Imports IronBarCode
Imports System
Imports System.Linq

' Read QR code with optimized settings
Private result As BarcodeResults = BarcodeReader.Read("QR.png", New BarcodeReaderOptions() With {.ExpectBarcodeTypes = BarcodeEncoding.QRCode})

' Extract and display the decoded value
If result IsNot Nothing AndAlso result.Any() Then
	Console.WriteLine(result.First().Value)
Else
	Console.WriteLine("No QR codes found in the image.")
End If

using IronBarCode;
using System;
using System.Linq;

// Configure advanced reading options
BarcodeReaderOptions options = new BarcodeReaderOptions
{
    Speed = ReadingSpeed.Faster,           // Optimize for speed
    ExpectMultipleBarcodes = false,        // Single QR code expected
    ExpectBarcodeTypes = BarcodeEncoding.QRCode, // QR codes only
    Multithreaded = true,                  // Enable parallel processing
    MaxParallelThreads = 4,                // Utilize multiple CPU cores
    RemoveFalsePositive = true,            // Filter out false detections
    ImageFilters = new ImageFilterCollection() // Apply preprocessing
    {
        new AdaptiveThresholdFilter(),    // Handle varying lighting
        new ContrastFilter(),              // Enhance contrast
        new SharpenFilter()                // Improve edge definition
    }
};

// Read with advanced configuration
BarcodeResults result = BarcodeReader.Read("QR.png", options);

Imports IronBarCode
Imports System
Imports System.Linq

' Configure advanced reading options
Private options As New BarcodeReaderOptions With {
	.Speed = ReadingSpeed.Faster,
	.ExpectMultipleBarcodes = False,
	.ExpectBarcodeTypes = BarcodeEncoding.QRCode,
	.Multithreaded = True,
	.MaxParallelThreads = 4,
	.RemoveFalsePositive = True,
	.ImageFilters = New ImageFilterCollection() From {
		New AdaptiveThresholdFilter(),
		New ContrastFilter(),
		New SharpenFilter()
	}
}

' Read with advanced configuration
Private result As BarcodeResults = BarcodeReader.Read("QR.png", options)