1         public Stream ReuestImage()
2         {
3             HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create("http://passport.csdn.net/ShowExPwd.aspx?DateTime=2007-1-24");
4             hwr.ContentType = "application/x-www-form-urlencoded";
5             hwr.Method = "GET";
6             HttpWebResponse hw = (HttpWebResponse)hwr.GetResponse();
7             return hw.GetResponseStream();
8         }
1         /// <summary>
 2         /// 加载图形,象素转换为数组
 3         /// </summary>
 4         private void Load()
5         {
6             MyNet mn = new MyNet();
7             bt = (Bitmap)Bitmap.FromStream(mn.ReuestImage());
8             //bt = (Bitmap)Bitmap.FromFile("c:/tt.bmp");
 9             int x = bt.Width;
10             int y = bt.Height;
11             pixColor = new Color[x , y];
12
13             for (int i = 0; i < x; i++)
14             {
15                 for (int k = 0; k < y; k++)
16                 {
17                     pixColor[i,k] = bt.GetPixel(i, k);
18                 }
19             }
20         }

1             for (int i = 0; i < pixColor.GetLength(0); i++)
2             {
3                 for (int j = 0; j < pixColor.GetLength(1); j++)
4                 {
5                     string s = ColorTranslator.ToHtml(pixColor[i, j]).Remove(0,1);
6                     string s1 = s.Remove(2);
7                     string s2 = s.Remove(0, 2).Remove(2);
8                     string s3 = s.Remove(0, 4);
9
10                     if (Convert.ToInt32(s1, 16) + Convert.ToInt32(s2, 16) + Convert.ToInt32(s3, 16) < 408)
11                         bt.SetPixel(i, j, Color.White);
12                     else
13                         bt.SetPixel(i,j,Color.Black);
14                 }
15             }