有没有好用的验证码识别的类？

Question

    适合。NET的， 全数字型图片的，渐进式的，源代码或者封装好的DLL都行

Answer 1

    /// <summary>
    /// 验证码
    /// </summary>
    public class CheckCode
    {
        /// <summary>
        /// 创建验证码,返回验证码字符串
        /// </summary>
        /// <param name="CodeLen">int CodeLe:验证码长度</param>
        /// <param name="CodeType">int CodeType:0纯数字;1纯字母;2数字与字母混合;3纯汉字</param>
        /// <returns></returns>
        public static string CreateCheckCode(int CodeLen, int CodeType)
        {
            /**参数说明：CodeLen(验证码长度）;CodeType(0纯数字，1纯字母,2,数字与字母混合，3,纯汉字)**/            if (CodeType > 3)
            {
                CodeType = 3;
            }            string codestring = "";            //定义验证图片的长度与宽度            int Clen = 30 * CodeLen, Cheight = 40;            //定义验证图片的背景颜色            Color CBcolor = Color.FromArgb(200, 200, 200);            string[] font = { "Bell MT", "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体", "幼圆", "楷体_GB2312", "仿宋_GB2312" };            Font Cfont = new Font("Arial", 20, FontStyle.Bold);            //产生随机验证码---------------------------------------------------------------------------------------------------            switch (CodeType)
            {
                //纯数字                case 0:                    Random random1 = new Random();                    codestring = random1.Next((int)System.Math.Pow(10, CodeLen - 1), (int)System.Math.Pow(10, CodeLen) - 1).ToString();                    break;                //纯数字                //纯字母                case 1:                    string Vchar1 = "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";                    String[] VcArray1 = Vchar1.Split(',');                    int vclen1 = VcArray1.Length;                    int vcindex1;                    Random random2 = new Random();                    for (int i = 0; i < CodeLen; i++)
                    {
                        vcindex1 = random2.Next(vclen1);                        codestring = codestring + VcArray1[vcindex1];
                    }                    break;                case 2:                    string Vchar2 = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z,0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";                    String[] VcArray2 = Vchar2.Split(',');                    int vclen2 = VcArray2.Length;                    int vcindex2;                    Random random3 = new Random();                    for (int i = 0; i < CodeLen; i++)
                    {
                        vcindex2 = random3.Next(vclen2);                        codestring = codestring + VcArray2[vcindex2];
                    }                    break;                //纯字母                //纯汉字                case 3:                    //定义一个字符串数组储存汉字编码的组成元素                     string[] rBase = new String[16] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };                    Random rnd = new Random();                    int strlength = CodeLen * 2;                    //定义一个object数组用来                     object[] bytes = new object[strlength];                    /**/                    /*每循环一次产生一个含两个元素的十六进制字节数组，并将其放入bject数组中          每个汉字有四个区位码组成          区位码第1位和区位码第2位作为字节数组第一个元素          区位码第3位和区位码第4位作为字节数组第二个元素          */                    for (int i = 0; i < strlength; i++)
                    {
                        //区位码第1位                         int r1 = rnd.Next(11, 14);                        string str_r1 = rBase[r1].Trim();                        //区位码第2位                         rnd = new Random(r1 * unchecked((int)DateTime.Now.Ticks) + i);//更换随机数发生器的种子避免产生重复值                         int r2;                        if (r1 == 13)
                        {                            r2 = rnd.Next(0, 7);                        }                        else
                        {                            r2 = rnd.Next(0, 16);                        }                        string str_r2 = rBase[r2].Trim();                        //区位码第3位                         rnd = new Random(r2 * unchecked((int)DateTime.Now.Ticks) + i);                        int r3 = rnd.Next(10, 16);                        string str_r3 = rBase[r3].Trim();                        //区位码第4位                         rnd = new Random(r3 * unchecked((int)DateTime.Now.Ticks) + i);                        int r4;                        if (r3 == 10)
                        {
                            r4 = rnd.Next(1, 16);
                        }                        else if (r3 == 15)
                        {
                            r4 = rnd.Next(0, 15);
                        }                        else
                        {
                            r4 = rnd.Next(0, 16);
                        }                        string str_r4 = rBase[r4].Trim();                        //定义两个字节变量存储产生的随机汉字区位码                         byte byte1 = Convert.ToByte(str_r1 + str_r2, 16);                        byte byte2 = Convert.ToByte(str_r3 + str_r4, 16);                        //将两个字节变量存储在字节数组中                         byte[] str_r = new byte[] { byte1, byte2 };                        //将产生的一个汉字的字节数组放入object数组中                         bytes.SetValue(str_r, i);
                    }                    Encoding gb = Encoding.GetEncoding("gb2312");                    //根据汉字编码的字节数组解码出中文汉字                     for (int i = 0; i < strlength / 2; i++)
                    {
                        codestring = codestring + gb.GetString((byte[])Convert.ChangeType(bytes[i], typeof(byte[])));
                    }                    break;                //纯汉字            }            //显示验证码-----------------------------------------------------------------------------------------------------            //创建一个图像            //定义画笔，用于绘制文字            Brush brush1 = new SolidBrush(Color.Black);            Bitmap bitmap1 = new System.Drawing.Bitmap(Clen, Cheight);            //从图像获取一个绘画面            Graphics graphics1 = Graphics.FromImage(bitmap1);            //清除整个绘图画面并用颜色填充            graphics1.Clear(CBcolor);            PointF Cpoint1 = new PointF(5, 5);            Random rnd1 = new Random();            int x1 = 0, y1 = 0;            //绘制边框            graphics1.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap1.Width - 1, bitmap1.Height - 1);            //绘制文字            for (int i = 0; i < codestring.Length; i++)
            {
                //随机字符位置                x1 = rnd1.Next(10) + 25 * i;                y1 = rnd1.Next(bitmap1.Height / 4);                Cpoint1 = new PointF(x1, y1);                //随机字符颜色,应根据背景作适当调整以免显示模糊不清                brush1 = new SolidBrush(Color.FromArgb(rnd1.Next(100), rnd1.Next(100), rnd1.Next(100)));                Cfont = new Font(font[rnd1.Next(font.Length - 1)], 16, FontStyle.Bold);                //随机倾斜字符                //graphics1.TranslateTransform(10, 0);                //Matrix transform = graphics1.Transform;                //transform.Shear(Convert.ToSingle(rnd1.NextDouble() - 0.5), 0.001f);                //graphics1.Transform = transform;                graphics1.DrawString(codestring.Substring(i, 1), Cfont, brush1, Cpoint1);                graphics1.ResetTransform();
            }            //绘制干扰点            //rnd1 = new Random();            //for (int i = 0; i < 50 * CodeLen; i++)
            //{
            //    //随机干扰位置            //    x1 = rnd1.Next(bitmap1.Width);            //    y1 = rnd1.Next(bitmap1.Height);            //    bitmap1.SetPixel(x1, y1, Color.FromArgb(rnd1.Next(50), rnd1.Next(50), rnd1.Next(50)));
            //}            //绘制干扰线            //rnd1 = new Random();            //for (int i = 0; i < 10; i++)
            //{
            //    //随机干扰位置            //    x1 = rnd1.Next(bitmap1.Width);            //    y1 = rnd1.Next(bitmap1.Height);            //    int x2 = rnd1.Next(bitmap1.Width);            //    int y2 = rnd1.Next(bitmap1.Height);            //    //随机干扰线颜色            //    Pen pen1 = new Pen(Color.FromArgb(rnd1.Next(100, 255), rnd1.Next(100, 255), rnd1.Next(100, 255)));            //    graphics1.DrawLine(pen1, x1, y1, x2, y2);
            //}            bitmap1.Save(HttpContext.Current.Response.OutputStream, ImageFormat.Jpeg);            bitmap1.Dispose();            graphics1.Dispose();            return codestring;
        }
    }

Answer 2

http://topic.csdn.net/u/20091211/16/6926305a-120b-4715-a481-af06b6fb743c.html