1 /// <summary>
2 /// 生成缩略图返回byte[]
3 /// </summary>
4 /// <param name="fileName"></param>
5 /// <returns></returns>
6 private byte[] GetByteByPic(string fileName)
7 {
8 MemoryStream ms = new MemoryStream();
9
10 Bitmap bitmap = new Bitmap(fileName);
11
12 //获取原图片的宽和高
13 int width = bitmap.Width;
14 int height = bitmap.Height;
15 Rectangle newPic = new Rectangle(0, 0, width, height);
16
17 //创建原图片的副本
18 System.Drawing.Image newImg = bitmap.Clone(newPic,
19 System.Drawing.Imaging.PixelFormat.DontCare);
20 System.Drawing.Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(CallBack);
21
22 //设置生成后的缩略图,其中200,200表示你需要得到的宽和高
23 System.Drawing.Image myThumbnail = bitmap.GetThumbnailImage(200, 200, CallBack, IntPtr.Zero);
24
25 //保存到内存里
26 myThumbnail.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
27
28 myThumbnail.Dispose(); //释放图片资源
29 newImg.Dispose();
30 bitmap.Dispose();
31
32 return ms.ToArray(); //内在里解出来返回byte[]
33 }
34
35 private static bool CallBack() //这个委托方法需要是static的
36 {
37 return false;
38 }
39
