C # generates two-dimensional code (QR code) using Qrcode.net

Http://www.cnblogs.com/Soar1991/archive/2012/03/30/2426115.html

Many applications on the web now use QR codes to share URLs or other information. Especially in the mobile domain, the QR code is a very large application scenario. Because of the needs of the project, need to add a Web site to generate two-dimensional code analysis of the function of the URL, in the case of large cramps in Google's frustration using Baidu. Baidu N More, find some projects, but the availability is not strong. (There is a project developed with VS2005, debugging in 2010 does not open.) Finally found a "artifact" on the CodePlex, this "artifact" can be very convenient to generate two-dimensional code, speed that is quite fast, and can support Chinese, adhere to the MIT Protocol.

Qrcode.net is a class library written in C # to generate two-dimensional code images, which makes it easy to provide QR code output functionality for WinForm, WebForm, WPF, Silverlight, and Windows Phone 7 applications. You can export two-dimensional code files to EPS format.

The project address is: http://qrcodenet.codeplex.com

The qrcode.net no longer uses the http://code.google.com/p/zxing/ZXing port, and the new version will have better performance.

The test results are as follows (in microseconds):

Input string Length: 74 x

EC Performance tests~ qrcode.net:3929 zxing:5221

At the same time, Qrcode.net can parse the string and decide whether to use UTF-8 encoding. (for example, when using Chinese.) ）

QRCode How to use:

New project adds a reference to the class library and then introduces the Gma.QrCodeNet.Encoding namespace.

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usingGma.QrCodeNet.Encoding;

Output the QR code in the console:

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Console.Write(@"Type some text to QR code: ");string sampleText = Console.ReadLine();QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.M);QrCode qrCode = qrEncoder.Encode(sampleText);for (int j = 0; j < qrCode.Matrix.Width; j++){    for (int i = 0; i < qrCode.Matrix.Width; i++)    {        char charToPrint = qrCode.Matrix[i, j] ? ‘█‘ : ‘ ‘;        Console.Write(charToPrint);    }    Console.WriteLine();}Console.WriteLine(@"Press any key to quit.");Console.ReadKey();

This code produces the following output:

To draw a QR code on the graphics:

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const string helloWorld = "Hello World!";     QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);     QrCode qrCode = qrEncoder.Encode(helloWorld);     const int moduleSizeInPixels = 5;     Renderer renderer = new Renderer(moduleSizeInPixels, Brushes.Black, Brushes.White);     Panel panel = new Panel();     Point padding =  new Point(10,16);     Size qrCodeSize = renderer.Measure(qrCode.Matrix.Width);     panel.AutoSize = false;     panel.Size = qrCodeSize + new Size(2 * padding.X, 2 * padding.Y);          using (Graphics graphics = panel.CreateGraphics())     {         renderer.Draw(graphics, qrCode.Matrix, padding);     }

Draw the QR code on the WriteableBitmap:

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const string helloWorld = "Hello World!";QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);QrCode qrCode = new QrCode();qrEncoder.TryEncode(helloWorld, out qrCode);const int moduleSizeInPixels = 5;Renderer renderer = new Renderer(moduleSizeInPixels);   //Black&White is default colour for drawing QrCode //Matrix under qrCode might be null if input string is null or empty. 21 module wide is version 1 QrCode‘s width. int pixelSize = qrCode.Matrix == null ? renderer.Measure(21) : renderer.Measure(qrCode.Matrix.Width);WriteableBitmap wBitmap = new WriteableBitmap(pixelSize, pixelSize, 96, 96, PixelFormats.Gray8, null);//If wBitmap is null value. renderer will create Gray8 Bitmap as default.renderer.Draw(wBitmap, qrCode.Matrix);    //Default offset position is (0, 0);//Now you can put wBitmap to Image control‘s Source or use it to create image file.

If you need to present the QR code in a WinForm or WPF application, you can drag the class library directly into the Toolbox and then drag the control directly onto the form.

Save QR Code directly to file:

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QrEncoder qrEncoder = newQrEncoder(ErrorCorrectionLevel.H);QrCode qrCode = new QrCode();qrEncoder.TryEncode(helloWorld, out qrCode); Renderer renderer = newRenderer(5, Brushes.Black, Brushes.White);renderer.CreateImageFile(qrCode.Matrix, @"c:\temp\HelloWorld.png", ImageFormat.Png);

Write the QR code to the stream:

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QrEncoder qrEncoder = newQrEncoder(ErrorCorrectionLevel.H);QrCode qrCode = new QrCode();qrEncoder.TryEncode(helloWorld, out qrCode); Renderer renderer = new Renderer(5, Brushes.Black, Brushes.White);MemoryStream ms = newMemoryStream();renderer.WriteToStream(qrCode.Matrix, ms, ImageFormat.png);

C # generates two-dimensional code (QR code) using Qrcode.net