Qrcode生成二维码支持中文,带图片,带文字

1.下载Qrcode库源码, 下载地址：http://www.codeproject.com/Articles/20574/Open-Source-QRCode-Library
2.打开源码时, 部分类库可能会加载失败, 不用理会, 只需正常加载 QRCodeLib, QRCodeSampleApp 即可.
3.生成时, 会提示编译出错, Error‘ThoughtWorks.QRCode.Properties.Resources‘ does not contain a definition for ‘GetResource‘.
需修改错误提示的代码行为：

MemoryStream memoryStream = new MemoryStream((byte[])Resources.ResourceManager.GetObject(fileName));

修改支持中文

修改库QRCodeLib中的类QRCodeEncoder.cs

public virtual Bitmap Encode(String content)
    {
      if (QRCodeUtility.IsUniCode(content))
      {
         return Encode(content, Encoding.Unicode);
      }
      else
      {
         return Encode(content, Encoding.ASCII);
      }
    }

为

public virtual Bitmap Encode(String content)
    {
        if (QRCodeUtility.IsUniCode(content))
{
return Encode(content, Encoding.GetEncoding("gb2312"));
}
else
{
return Encode(content, Encoding.ASCII);
}
    }

对应的，QRCodeDecoder.cs类中的相应代码也要改。这样就中英文支持了。（改为UTF8也可以）

扩展
1、修改 QRCodeEncoder.cs 跟 QRCodeDecoder.cs. 搜索一下, 將 Encoding.Unicode 替換成 Encoding.UTF8
2、修改 QRCodeUtility.cs.  將 UnicodeEncoding encoding = new UnicodeEncoding(); 改成 UTF8Encoding encoding = new UTF8Encoding();

使用

QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            String encoding = cboEncoding.Text ;
            if (encoding == "Byte") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            } else if (encoding == "AlphaNumeric") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;
            } else if (encoding == "Numeric") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;
            }
            try {
                int scale = Convert.ToInt16(txtSize.Text);
                qrCodeEncoder.QRCodeScale = scale;
            } catch (Exception ex) {
                MessageBox.Show("Invalid size!");
                return;
            }
            try {
                int version = Convert.ToInt16(cboVersion.Text) ;
                qrCodeEncoder.QRCodeVersion = version;
            } catch (Exception ex) {
                MessageBox.Show("Invalid version !");
            }
            string errorCorrect = cboCorrectionLevel.Text;
            if (errorCorrect == "L")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
            else if (errorCorrect == "M")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            else if (errorCorrect == "Q")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
            else if (errorCorrect == "H")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
            Image image;
            String data = txtEncodeData.Text;
            image = qrCodeEncoder.Encode(data);
            picEncode.Image = image;

带图片

/// <summary>
      /// 生成二维码.
      /// </summary>
      /// <param name="data">需要添加进去的文本</param>
      /// <returns></returns>
      public System.Drawing.Image GCode(String data)
      {
          QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
          qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
          qrCodeEncoder.QRCodeScale = 5;
          qrCodeEncoder.QRCodeVersion = 7;  

          qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
          var pbImg = qrCodeEncoder.Encode(data, System.Text.Encoding.UTF8);
         var width = pbImg.Width / 10;
        var dwidth = width * 2;
          Bitmap bmp = new Bitmap(pbImg.Width + dwidth, pbImg.Height + dwidth);
          Graphics g = Graphics.FromImage(bmp);
          var c = System.Drawing.Color.White;
          g.FillRectangle(new SolidBrush(c), 0, 0, pbImg.Width + dwidth, pbImg.Height + dwidth);
          g.DrawImage(pbImg, width, width);
          g.Dispose();
         return bmp;
      }  

     /// <summary>
      /// 调用此函数后使此两种图片合并，类似相册，有个
    /// 背景图，中间贴自己的目标图片
     /// </summary>
      /// <param name="sourceImg">粘贴的源图片</param>
      /// <param name="destImg">粘贴的目标图片</param>
      public static System.Drawing.Image CombinImage(System.Drawing.Image imgBack, string destImg)
      {  

          System.Drawing.Image img = System.Drawing.Image.FromFile(destImg);        //照片图片
          if (img.Height != 50 || img.Width != 50) {
              img = KiResizeImage(img, 50, 50, 0);
          }
          Graphics g = Graphics.FromImage(imgBack);  

          g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);      //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);   

          //g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);//相片四周刷一层黑色边框  

          //g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);  

         g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2 , img.Width, img.Height);
          GC.Collect();
          return imgBack;
      }  

      /// <summary>
      /// Resize图片
      /// </summary>
      /// <param name="bmp">原始Bitmap</param>
      /// <param name="newW">新的宽度</param>
      /// <param name="newH">新的高度</param>
      /// <param name="Mode">保留着，暂时未用</param>
      /// <returns>处理以后的图片</returns>
      public static System.Drawing.Image KiResizeImage(System.Drawing.Image bmp, int newW, int newH, int Mode)
      {
          try
          {
              System.Drawing.Image b = new Bitmap(newW, newH);
              Graphics g = Graphics.FromImage(b);  

              // 插值算法的质量
              g.InterpolationMode = InterpolationMode.HighQualityBicubic;  

             g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
             g.Dispose();  

              return b;
          }
         catch
          {
              return null;
      }
}

原文地址：http://blog.csdn.net/a497785609/article/details/43019951

完整Demo下载：http://download.csdn.net/detail/a497785609/8387311