C# 生成二维码

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

      ThoughtWorks.QRCode.Codec.QRCodeEncoder encoder = new QRCodeEncoder();         encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方式(注意:BYTE能支持中文,ALPHA_NUMERIC扫描出来的都是数字)         encoder.QRCodeScale = 4;//大小(值越大生成的二维码图片像素越高)          encoder.QRCodeVersion = 0;//版本(注意:设置为0主要是防止编码的字符串太长时发生错误)          encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//错误效验、错误更正(有4个等级)   String qrdata = "二维码信息"; System.Drawing.Bitmap bp = encoder.Encode(qrdata.ToString(), Encoding.GetEncoding("GB2312"));             Image image = bp;             pictureBox1.Image = bp; 保存二维码图片: SaveFileDialog sf = new SaveFileDialog();             sf.Title = "选择保存文件位置";             sf.Filter = "保存图片(*.jpg) |*.jpg|全部文件(*.*) |*.*";             //设置默认文件类型显示顺序             sf.FilterIndex = 1;             //保存对话框是否记忆上次打开的目录             sf.RestoreDirectory = true;             if (sf.ShowDialog() == DialogResult.OK)             {                 Image im = this.pictureBox1.Image;                 //得到文件路径                 string localFilePath = sf.FileName.ToString();                 if (sf.FileName != "")                 {                    string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1);//获取文件名,不带路径                    // newFileName = fileNameExt+DateTime.Now.ToString("yyyyMMdd")  ;//给文件名后加上时间                    string FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf("."));  //获取文件路径,带文件名,不带后缀                     string fn = sf.FileName;                     pictureBox1.Image.Save(FilePath +"-"+ DateTime.Now.ToString("yyyyMMdd") + ".jpg");                                     } }  //解析二维码信息   // QRCodeDecoder decoder = new QRCodeDecoder();   //  String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(pictureBox1.Image)));    //this.label3.Text = decodedString;  二、另外一种方法,引用ZXing类库。   ZXing是一个开源Java类库用于解析多种格式的1D/2D条形码。目标是可以对QR编码、Data Matrix、UPC的1D条形码进行解码。于此同时,它一样提供 cpp,ActionScript,android,iPhone,rim,j2me,j2se,jruby,C#等方式的类库。zxing类库的做用主 要是解码,是目前开源类库中解码能力比较强的(商业的另说,不过对于动辄成千上万的类库受权费用,的确很值)。 到谷歌code下载相应的代码 1.下载zxing最新的包 到zxing的主页: http://code.google.com/p/zxing/ 找到其中的CSharp文件夹,在vs中打开并编译,将obj下debug中的zxing.dll复制并粘帖到你的项目中的bin文件目录下, 右击添加项目引用。将zxing.dll引用到项目中,就能够在须要的地方使用了。 源代码中有两处UTF-8的问题,会致使中文出现乱码(编译.dll以前修改) 其一:com.google.zxing.qrcode.encoder.encoder类中的 internal const System.String DEFAULT_BYTE_MODE_ENCODING = "ISO-8859-1"; 此处,将ISO-8859-1改成UTF-8 其二:com.google.zxing.qrcode.decoder.DecodedBitStreamParser类的成员 private const System.String UTF8 = "UTF8"; 应将UTF8改成UTF-8 生成代码: //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 = "二维码信息";         ByteMatrix byteMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300, 300);         Bitmap bitmap = toBitmap(byteMatrix);         pictureBox1.Image = bitmap;         SaveFileDialog sFD = new SaveFileDialog();         sFD.Filter = "保存图片(*.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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