asp.net(C#)使用QRCode生成图片中心加Logo或图像的二维码实例

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;
    }
  }
}

运行效果如下图所示：

ps：本站还提供了一个功能十分强悍的在线二维码生成工具，可实现文本、电话号码、短信、邮件、网址等的二维码生成及logo图标添加功能：

在线生成二维码工具(加强版)：

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