ASP.NET生成二維碼的方法總結

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    本文實例總結了ASP.NET生成二維碼的方法。分享給大家供大家參考,具體如下:
    分享一例c#生成二維碼的代碼,直接引用ThoughtWorks.QRCode.dll 類生成二維碼,有需要的朋友參考下。
    方法1.直接引用ThoughtWorks.QRCode.dll 類,生成二維碼。
    代碼示例:
    ThoughtWorks.QRCode.Codec.QRCodeEncoder encoder = new QRCodeEncoder();
    encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//編碼方法(注意:BYTE能支持中文,ALPHA_NUMERIC掃描出來的都是數(shù)字)
    encoder.QRCodeScale = 4;//大小
    encoder.QRCodeVersion = 0;//版本(注意:設置為0主要是防止編碼的字符串太長時發(fā)生錯誤)
    encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
    String qrdata = "二維碼信息";
    System.Drawing.Bitmap bp = encoder.Encode(qrdata.ToString(), Encoding.GetEncoding("GB2312"));
    Image image = bp;
    Object oMissing = System.Reflection.Missing.Value;
    pictureBox1.Image = bp;
    保存二維碼圖片:
    代碼示例:
    SaveFileDialog sf = new SaveFileDialog();
    sf.Title = "選擇保存文件位置";
    sf.Filter = "保存圖片(*.jpg) |*.jpg|所有文件(*.*) |*.*";
    //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;
      //獲得文件路徑
      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") ;//給文件名后加上時間
        string FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf(".")); //獲取文件路徑,帶文件名,不帶后綴
        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;
    方法2.引用ZXing類庫。
    ZXing是一個開源Java類庫用于解析多種格式的1D/2D條形碼。目標是能夠對QR編碼、Data Matrix、UPC的1D條形碼進行解碼。于此同時,它同樣提供 cpp,ActionScript,android,iPhone,rim,j2me,j2se,jruby,C#等方式的類庫。zxing類庫的作用主 要是解碼,是目前開源類庫中解碼能力比較強的(商業(yè)的另說,不過對于動輒成千上萬的類庫授權費用,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中打開并編譯,將obj下debug中的zxing.dll復制并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,就可以在需要的地方使用了。
    源代碼中有兩處UTF-8的問題,會導致中文出現(xiàn)亂碼(編譯.dll之前修改)
    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改為UTF-8
    其二:com.google.zxing.qrcode.decoder.DecodedBitStreamParser類的成員
    private const System.String UTF8 = "UTF8";
    應將UTF8改為UTF-8
    代碼示例:
    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|所有文件(*.*) |*.*";
    sFD.DefaultExt = "*.png|*.png";
    sFD.AddExtension = true;
    if (sFD.ShowDialog() == DialogResult.OK)
    {
    if (sFD.FileName != "")
    {
      writeToFile(byteMatrix, System.Drawing.Imaging.ImageFormat.Png, sFD.FileName);
    }
    }
    解析二維碼:
    代碼示例:
    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;
    }
    希望本文所述對大家asp.net程序設計有所幫助。