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本文实例讲述了asp.net(C#)使用QRCode生成图片中心加Logo或图像的二维码。分享给大家供大家参考，具体如下：

<%@ WebHandler Language="C#" Class="GetQRCode" %>

using System;

using System.Web;

using ThoughtWorks.QRCode.Codec;

using ThoughtWorks.QRCode.Codec.Data;

using ThoughtWorks.QRCode.Codec.Util;

using System.IO;

using System.Text;

using System.Drawing;

using System.Drawing.Drawing2D;

public class GetQRCode : IHttpHandler

{

  public void ProcessRequest(HttpContext context)

  {

    String data = context.Request["CodeText"];

    if (!string.IsNullOrEmpty(data))

    {

      QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

      qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;

      qrCodeEncoder.QRCodeScale = 4;

      qrCodeEncoder.QRCodeVersion = 8;

      qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;

      System.Drawing.Image image = qrCodeEncoder.Encode(data);

      System.IO.MemoryStream MStream = new System.IO.MemoryStream();

      image.Save(MStream, System.Drawing.Imaging.ImageFormat.Png);

      System.IO.MemoryStream MStream1 = new System.IO.MemoryStream();

      CombinImage(image, context.Server.MapPath("~/images/201292891051540.jpg")).Save(MStream1, System.Drawing.Imaging.ImageFormat.Png);

      context.Response.ClearContent();

      context.Response.ContentType = "image/png";

      context.Response.BinaryWrite(MStream1.ToArray());

      //image.Dispose();

      MStream.Dispose();

      MStream1.Dispose();

    }

    context.Response.Flush();

    context.Response.End();

  }

  /// <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="imgBack">粘贴的源图片</param>

  /// <param name="destImg">粘贴的目标图片</param>

  public static Image CombinImage(Image imgBack, string destImg)

  {

    Image img = Image.FromFile(destImg);    //照片图片

    if (img.Height != 65 || img.Width != 65)

    {

      img = KiResizeImage(img, 65, 65, 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 Image KiResizeImage(Image bmp, int newW, int newH, int Mode)

  {

    try

    {

      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;

    }

  }

  public bool IsReusable

  {

    get

    {

      return false;

    }

  }

}

希望本文所述对大家asp.net程序设计有所帮助。