Use QrCodeNet in MVC to generate a QR code and mvcqrcodenet to generate a QR code.

Use QrCodeNet in MVC to generate a QR code and mvcqrcodenet to generate a QR code.

QrCodeNet: http://qrcodenet.codeplex.com/

1 using System. drawing; 2 using System. drawing. imaging; 3 using System. IO; 4 using Gma. qrCodeNet. encoding; 5 using Gma. qrCodeNet. encoding. windows. render; 6 7 namespace QRCodeTest 8 {9 public class QRCodeHelper10 {11 /// <summary> 12 // generate QR code 13 /// </summary> 14 /// <param name = "content"> content </param> 15 /// <param name = "moduleSize"> QR code size </param> 16 /// <returns> output stream </returns> 17 public static MemoryStream GetQRCode (string content, int moduleSize = 9) 18 {19 // ErrorCorrectionLevel Error Correction level 20 // QuietZoneModules blank area 21 22 var encoder = new QrEncoder (ErrorCorrectionLevel. m); 23 QrCode qrCode = encoder. encode (content); 24 GraphicsRenderer render = new GraphicsRenderer (new FixedModuleSize (moduleSize, QuietZoneModules. two), Brushes. black, Brushes. white); 25 26 MemoryStream memoryStream = new MemoryStream (); 27 render. writeToStream (qrCode. matrix, ImageFormat. jpeg, memoryStream); 28 29 return memoryStream; 30 31 // code for generating images 32 // DrawingSize dSize = render. sizeCalculator. getSize (qrCode. matrix. width); 33 // Bitmap map = new Bitmap (dSize. codeWidth, dSize. codeWidth); 34 // Graphics g = Graphics. fromImage (map); 35 // render. draw (g, qrCode. matrix); 36 // map. save (fileName, ImageFormat. jpeg ); // fileName is the path of the stored image 37} 38 39 // <summary> 40 // generate a QR code 41 /// </summary> 42 // <param name = "content"> content </param> 43 // <param name = "iconPath"> logo path </param> 44 // <param name = "moduleSize"> QR code size </param> 45 // <returns> output stream </returns> 46 public static MemoryStream GetQRCode (string content, string iconPath, int moduleSize = 9) 47 {48 QrEncoder qrEncoder = new QrEncoder (ErrorCorrectionLevel. m); 49 QrCode qrCode = qrEncoder. encode (content); 50 51 GraphicsRenderer render = new GraphicsRenderer (new FixedModuleSize (moduleSize, QuietZoneModules. two), Brushes. black, Brushes. white); 52 53 DrawingSize dSize = render. sizeCalculator. getSize (qrCode. matrix. width); 54 Bitmap map = new Bitmap (dSize. codeWidth, dSize. codeWidth); 55 Graphics g = Graphics. fromImage (map); 56 render. draw (g, qrCode. matrix); 57 58 // append the Logo image. Pay attention to controlling the ratio of the Logo image size to the QR code. 59 // PS: If the append image is too large, the information will be lost if the ratio of the two-dimensional code exceeds the limit, cannot be recognized 60 Image img = Image. fromFile (iconPath); 61 62 Point imgPoint = new Point (map. width-img. width)/2, (map. height-img. height)/2); 63g. drawImage (img, imgPoint. x, imgPoint. y, img. width, img. height); 64 65 MemoryStream memoryStream = new MemoryStream (); 66 map. save (memoryStream, ImageFormat. jpeg); 67 68 return memoryStream; 69 70 // The code for generating the image: map. save (fileName, ImageFormat. jpeg); // fileName indicates the path of the stored image 71} 72} 73}

 

Controller:

 1 public ActionResult CreateQrCode() 2  { 3        string str = "http://cn.bing.com/search?q=C%23"; 4        using (var memoryStream = QRCodeHelper.GetQRCode(str, Server.MapPath(@"~/images/logo.jpg"))) 5        { 6              Response.ContentType = "image/jpeg"; 7              Response.OutputStream.Write(memoryStream.GetBuffer(), 0, (int)ms.Length); 8              Response.End(); 9        }10        return null;11 }

View:

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The effect is as follows: