1 public static byte[] GetVerifyCode(string codeStr)
2 {
3 Random r = new Random();
4 Bitmap btBitmap = new Bitmap(80, 30);
5
6 Graphics g = Graphics.FromImage(btBitmap);
7 g.Clear(Color.White);
8 //画干扰线
9 for (int i = 0; i < 20; i++)
10 {
11 int x1 = r.Next(btBitmap.Width);
12 int y1 = r.Next(btBitmap.Height);
13 int x2 = r.Next(btBitmap.Width);
14 int y2 = r.Next(btBitmap.Height);
15 g.DrawLine(new Pen(Color.Black),x1,y1,x2,y2 );
16 }
17 //画干扰点
18 for (int i = 0; i < 100; i++)
19 {
20 int x1 = r.Next(btBitmap.Width);
21 int y1 = r.Next(btBitmap.Height);
22 btBitmap.SetPixel(x1,y1,Color.Aqua);
23 }
24 //画图
25 g.DrawString(codeStr, new Font("宋体", 16), new SolidBrush(Color.Red), 0, 0);
26 MemoryStream ms = new MemoryStream();
27 btBitmap.Save(ms, ImageFormat.Gif);
28 return ms.ToArray();
29 }
