QrCode.Net 二维码

            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();

Tada!

Sample 2: Rendering QR code to graphics, let’s say to panel control with segment size of 5 pixel, blue on yellow and 10 pixel padding:

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using Gma.QrCodeNet.Rendering;

</span>
            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.Blue, Brushes.Yellow);

            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);
            }

Sample 3: Using out-of-the-box WinForms control. Just drag & drop it to your form an set Text and AutoSize property:

Sample 4: Saving QR code to file:

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            QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);
            QrCode qrCode = qrEncoder.Encode("Hello World!");

            Renderer renderer = new Renderer(5, Brushes.Black, Brushes.White);
            renderer.CreateImageFile(qrCode.Matrix, @"c:\temp\HelloWorld.png", ImageFormat.Png);

Project TODOs and Plans

I think this project would be a good playground for:

1. Understanding QR code form inside
2. Designing and implementing efficient and elegant data structures and algorithms. I have looked at the ZXing codebase, especially encoding. The code is good, but there are still many things ti improve. Furthermore the automated Java to c# converter produced a lot of mess.
3. Refactoring and rewriting code in a TDD manner – existing implementation can be used as an excellent refactoring initial point. In some cases I think I would prefer to rewrite and use old classes a reference implementations and run my test again both the old and the new code.