asp.net(C#)利用QRCode生成二维码(续)-在二维码图片中心加Logo或图像

1. <%@ WebHandler Language="C#" Class="GetQRCode" %>
2. using System;
3. using System.Web;
4. using ThoughtWorks.QRCode.Codec;
5. using ThoughtWorks.QRCode.Codec.Data;
6. using ThoughtWorks.QRCode.Codec.Util;
7. using System.IO;
8. using System.Text;
9. using System.Drawing;
10. using System.Drawing.Drawing2D;
11. public class GetQRCode : IHttpHandler
12. {
13. public void ProcessRequest(HttpContext context)
14. {
15. String data = context.Request["CodeText"];
16. if (!string.IsNullOrEmpty(data))
17. {
18. QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
19. qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
20. qrCodeEncoder.QRCodeScale = 4;
21. qrCodeEncoder.QRCodeVersion = 8;
22. qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
23. System.Drawing.Image image = qrCodeEncoder.Encode(data);
24. System.IO.MemoryStream MStream = new System.IO.MemoryStream();
25. image.Save(MStream, System.Drawing.Imaging.ImageFormat.Png);
26. System.IO.MemoryStream MStream1 = new System.IO.MemoryStream();
27. CombinImage(image, context.Server.MapPath("~/images/201292891051540.jpg")).Save(MStream1, System.Drawing.Imaging.ImageFormat.Png);
28. context.Response.ClearContent();
29. context.Response.ContentType = "image/png";
30. context.Response.BinaryWrite(MStream1.ToArray());
31. //image.Dispose();
32. MStream.Dispose();
33. MStream1.Dispose();
34. }
35. context.Response.Flush();
36. context.Response.End();
37. }
38. /// <summary>
39. /// 调用此函数后使此两种图片合并，类似相册，有个
40. /// 背景图，中间贴自己的目标图片
41. /// </summary>
42. /// <param name="imgBack">粘贴的源图片</param>
43. /// <param name="destImg">粘贴的目标图片</param>
44. public static Image CombinImage(Image imgBack, string destImg)
45. {
46. Image img = Image.FromFile(destImg);        //照片图片
47. if (img.Height != 65 || img.Width != 65)
48. {
49. img = KiResizeImage(img, 65, 65, 0);
50. }
51. Graphics g = Graphics.FromImage(imgBack);
52. g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);      //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);
53. //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
54. //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);
55. g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height);
56. GC.Collect();
57. return imgBack;
58. }
59. /// <summary>
60. /// Resize图片
61. /// </summary>
62. /// <param name="bmp">原始Bitmap</param>
63. /// <param name="newW">新的宽度</param>
64. /// <param name="newH">新的高度</param>
65. /// <param name="Mode">保留着，暂时未用</param>
66. /// <returns>处理以后的图片</returns>
67. public static Image KiResizeImage(Image bmp, int newW, int newH, int Mode)
68. {
69. try
70. {
71. Image b = new Bitmap(newW, newH);
72. Graphics g = Graphics.FromImage(b);
73. // 插值算法的质量
74. g.InterpolationMode = InterpolationMode.HighQualityBicubic;
75. g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
76. g.Dispose();
77. return b;
78. }
79. catch
80. {
81. return null;
82. }
83. }
84. public bool IsReusable
85. {
86. get
87. {
88. return false;
89. }
90. }
91. }

效果如下