如何使用中文验证符

 

 1 起始:
 2 public void Start_Create()
 3 {
 4   Encoding gb = Encoding.GetEncoding("gb2312");
 5   object[] bytes = CreateRegionCode(4);
 6   string str1=gb.GetString((byte[]) Convert.ChangeType(bytes[0], typeof(byte[]))); 
 7   string str2=gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[]))); 
 8   string str3=gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[]))); 
 9   string str4=gb.GetString((byte[])Convert.ChangeType(bytes[3], typeof(byte[]))); 
10   string str = str1+" "+str2+" "+str3+" "+str4;
11   CreateImage(str);
12 }
13 
14 public object[] CreateRegionCode(int strLength)
15 {
16   string[] rBase = new string[16]{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
17   Random rnd = new Random();
18   object[] bytes = new object[strLength];
19   for(int i=0;i<strLength;i++)
20   {
21     //区位码第一位
22     int r1 = rnd.Next(11,14);
23     string str_r1 = rBase[r1].Trim();
24     //区位码第二位
25     rnd = new Random(r1*unchecked((int)DateTime.Now.Ticks)+i);            
26     int r2; 
27     if (r1==13) 
28     {                     r2=rnd.Next(0,7); 
29     } 
30     else 
31     {                     r2=rnd.Next(0,16); 
32     } 
33     string str_r2=rBase[r2].Trim();
34     //区位码第三位
35      rnd=new Random(r2*unchecked((int)DateTime.Now.Ticks)+i); 
36     int r3=rnd.Next(10,16); 
37     string str_r3=rBase[r3].Trim(); 
38     //区位码第四位
39      rnd=new Random(r3*unchecked((int)DateTime.Now.Ticks)+i); 
40     int r4; 
41     if (r3==10) 
42     {                     r4=rnd.Next(1,16); 
43     } 
44     else if (r3==15) 
45     {                    r4=rnd.Next(0,15); 
46     } 
47     else 
48     {                     r4=rnd.Next(0,16); 
49     } 
50     string str_r4=rBase[r4].Trim(); 
51     //存储随机产生的汉字区位码
52     byte byte1=Convert.ToByte(str_r1 + str_r2,16); 
53     byte byte2=Convert.ToByte(str_r3 + str_r4,16); 
54     byte[] str_r=new byte[]{byte1,byte2}; 
55     bytes.SetValue(str_r,i); 
56     }
57     return bytes;
58 }
59 
60 public void CreateImage(string str1)
61         {
62             int iWidth = (int)(str1.Length*18);
63             System.Drawing.Bitmap image = new Bitmap(iWidth,30);
64             Graphics g = Graphics.FromImage(image);
65 
66             Font f = new System.Drawing.Font("楷体", 12, System.Drawing.FontStyle.Bold);
67             Brush b = new System.Drawing.SolidBrush(Color.White);
68             g.FillRectangle(new System.Drawing.SolidBrush(Color.BlueViolet),0,0,image.Width,image.Height);
69             
70             //g.Clear(Color.BlueViolet);
71             g.DrawString(str1, f, b,15, 5);
72             Random rnd = new Random();
73             for(int i=0;i<20;i++)
74             {
75                 g.FillRectangle(new System.Drawing.SolidBrush(Color.Blue),rnd.Next(image.Width),0,1,image.Height);
76             }
77 //
78 //            Pen blackPen = new Pen(Color.Black, 0);
79 //            Random rand = new Random();
80 //            for (int i=0;i<5;i++)
81 //            {
82 //                int y = rand.Next(image.Height);
83 //                g.DrawLine(blackPen,0,y,image.Width,y-5);
84 //            }
85 
86 
87             System.IO.MemoryStream ms = new System.IO.MemoryStream();
88             image.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
89             Response.ClearContent();
90             Response.ContentType = "image/Jpeg";
91             Response.BinaryWrite(ms.ToArray());
92             g.Dispose();
93             image.Dispose();
94 
95 }