C# 生成二維碼

在C#中直接引用ThoughtWorks.QRCode.dll 類,
 android

      ThoughtWorks.QRCode.Codec.QRCodeEncoder encoder = new QRCodeEncoder();         encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//編碼方式(注意:BYTE能支持中文,ALPHA_NUMERIC掃描出來的都是數字)         encoder.QRCodeScale = 4;//大小(值越大生成的二維碼圖片像素越高)          encoder.QRCodeVersion = 0;//版本(注意:設置爲0主要是防止編碼的字符串太長時發生錯誤)          encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//錯誤效驗、錯誤更正(有4個等級)   String qrdata = "二維碼信息"; System.Drawing.Bitmap bp = encoder.Encode(qrdata.ToString(), Encoding.GetEncoding("GB2312"));             Image image = bp;             pictureBox1.Image = bp; 保存二維碼圖片: SaveFileDialog sf = new SaveFileDialog();             sf.Title = "選擇保存文件位置";             sf.Filter = "保存圖片(*.jpg) |*.jpg|全部文件(*.*) |*.*";             //設置默認文件類型顯示順序             sf.FilterIndex = 1;             //保存對話框是否記憶上次打開的目錄             sf.RestoreDirectory = true;             if (sf.ShowDialog() == DialogResult.OK)             {                 Image im = this.pictureBox1.Image;                 //得到文件路徑                 string localFilePath = sf.FileName.ToString();                 if (sf.FileName != "")                 {                    string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1);//獲取文件名,不帶路徑                    // newFileName = fileNameExt+DateTime.Now.ToString("yyyyMMdd")  ;//給文件名後加上時間                    string FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf("."));  //獲取文件路徑,帶文件名,不帶後綴                     string fn = sf.FileName;                     pictureBox1.Image.Save(FilePath +"-"+ DateTime.Now.ToString("yyyyMMdd") + ".jpg");                                     } }  //解析二維碼信息   // QRCodeDecoder decoder = new QRCodeDecoder();   //  String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(pictureBox1.Image)));    //this.label3.Text = decodedString;  二、另外一種方法,引用ZXing類庫。   ZXing是一個開源Java類庫用於解析多種格式的1D/2D條形碼。目標是可以對QR編碼、Data Matrix、UPC的1D條形碼進行解碼。於此同時,它一樣提供 cpp,ActionScript,android,iPhone,rim,j2me,j2se,jruby,C#等方式的類庫。zxing類庫的做用主 要是解碼,是目前開源類庫中解碼能力比較強的(商業的另說,不過對於動輒成千上萬的類庫受權費用,的確很值)。 到谷歌code下載相應的代碼 1.下載zxing最新的包 到zxing的主頁: http://code.google.com/p/zxing/ 找到其中的CSharp文件夾,在vs中打開並編譯,將obj下debug中的zxing.dll複製並粘帖到你的項目中的bin文件目錄下, 右擊添加項目引用。將zxing.dll引用到項目中,就能夠在須要的地方使用了。 源代碼中有兩處UTF-8的問題,會致使中文出現亂碼(編譯.dll以前修改) 其一:com.google.zxing.qrcode.encoder.encoder類中的 internal const System.String DEFAULT_BYTE_MODE_ENCODING = "ISO-8859-1"; 此處,將ISO-8859-1改成UTF-8 其二:com.google.zxing.qrcode.decoder.DecodedBitStreamParser類的成員 private const System.String UTF8 = "UTF8"; 應將UTF8改成UTF-8 生成代碼: //引用  using com.google.zxing.qrcode;  using com.google.zxing;  using com.google.zxing.common;  using ByteMatrix = com.google.zxing.common.ByteMatrix;  using EAN13Writer = com.google.zxing.oned.EAN13Writer;  using EAN8Writer = com.google.zxing.oned.EAN8Writer;  using MultiFormatWriter = com.google.zxing.MultiFormatWriter;         方法:         string content = "二維碼信息";         ByteMatrix byteMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300, 300);         Bitmap bitmap = toBitmap(byteMatrix);         pictureBox1.Image = bitmap;         SaveFileDialog sFD = new SaveFileDialog();         sFD.Filter = "保存圖片(*.png) |*.png|全部文件(*.*) |*.*";         sFD.DefaultExt = "*.png|*.png";         sFD.AddExtension = true;         if (sFD.ShowDialog() == DialogResult.OK)         {             if (sFD.FileName != "")             {                 writeToFile(byteMatrix, System.Drawing.Imaging.ImageFormat.Png, sFD.FileName);             }         } 解析:     if (this.openFileDialog1.ShowDialog() != DialogResult.OK)         {             return;         }         Image img = Image.FromFile(this.openFileDialog1.FileName);         Bitmap bmap;         try         {             bmap = new Bitmap(img);         }         catch (System.IO.IOException ioe)         {             MessageBox.Show(ioe.ToString());             return;         }         if (bmap == null)         {             MessageBox.Show("Could not decode image");             return;         }         LuminanceSource source = new RGBLuminanceSource(bmap, bmap.Width, bmap.Height);         com.google.zxing.BinaryBitmap bitmap1 = new com.google.zxing.BinaryBitmap(new HybridBinarizer(source));         Result result;         try         {             result = new MultiFormatReader().decode(bitmap1);         }         catch (ReaderException re)         {             MessageBox.Show(re.ToString());             return;         }         MessageBox.Show(result.Text);   public static void writeToFile(ByteMatrix matrix, System.Drawing.Imaging.ImageFormat format, string file)     {         Bitmap bmap = toBitmap(matrix);         bmap.Save(file, format);     }     public static Bitmap toBitmap(ByteMatrix matrix)     {         int width = matrix.Width;         int height = matrix.Height;         Bitmap bmap = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);         for (int x = 0; x < width; x++)         {             for (int y = 0; y < height; y++)             {                 bmap.SetPixel(x, y, matrix.get_Renamed(x, y) != -1 ? ColorTranslator.FromHtml("0xFF000000") : ColorTranslator.FromHtml("0xFFFFFFFF"));             }         }         return bmap;     }
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