using System;using System.Drawing;using System.Text;namespace Wisdom.JPClient.WeiXin.Utility{    public class VerifyCode    {        // 供验证码生成汉字时选取的汉字集,若为空则按照《GB2312简体中文编码表》编码规则构造汉字        private const string ChineseChars = "";        // 英文与数字串        private const string EnglishOrNumChars = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";        private const double PI = 3.1415926535897932384626433832795;        private const double PI2 = 6.283185307179586476925286766559;        // 全局随机数生成器        private Random rnd;        public VerifyCode()        {            rnd = new Random(unchecked((int)DateTime.Now.Ticks));        }        /// 
        /// 生成随机字符码        /// 
        /// 字符串长度        /// 中文字符数        /// 
             public string CreateVerifyCode(int codeLen, int zhCharsCount)        {            char[] chs = new char[codeLen];            int index = 0;            for (int i = 0; i < zhCharsCount; i++)            {                index = rnd.Next(0, codeLen);                if (chs[index] == '\0')                {                    chs[index] = CreateZhChar();                }                else                {                    --i;                }            }            for (int i = 0; i < codeLen; i++)            {                if (chs[i] == '\0')                {                    chs[i] = CreateEnOrNumChar();                }            }            return new string(chs, 0, chs.Length);        }        /// 
        /// 生成随机字符码 默认6位        /// 
        /// 
             public string CreateVerifyCode()        {            return CreateVerifyCode(4, 0);        }        /// 
        /// 生成校验码图片        /// 
        ///         /// 
             public Bitmap CreateImage(string verifyCode, int width, int height, int fontSize)        {            if (string.IsNullOrEmpty(verifyCode))            {                return null;            }            System.Drawing.Bitmap image = new System.Drawing.Bitmap(width, height);            Graphics g = Graphics.FromImage(image);            try            {                //生成随机生成器                Random random = new Random();                //清空图片背景色                g.Clear(Color.White);                //画图片的背景噪音线                for (int i = 0; i < 25; i++)                {                    int x1 = random.Next(image.Width);                    int x2 = random.Next(image.Width);                    int y1 = random.Next(image.Height);                    int y2 = random.Next(image.Height);                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);                }                Font font = new System.Drawing.Font("Verdana", fontSize, (System.Drawing.FontStyle.Italic));                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);                g.DrawString(verifyCode, font, brush, 5, 5);                //画图片的前景噪音点                for (int i = 0; i < 100; i++)                {                    int x = random.Next(image.Width);                    int y = random.Next(image.Height);                    image.SetPixel(x, y, Color.FromArgb(random.Next()));                }                //画图片的边框线                g.DrawRectangle(new Pen(Color.White), 0, 0, image.Width - 1, image.Height - 1);            }            catch            {                return null;            }            return image;        }        /// 
        /// 生成英文或数字字符        /// 
        /// 
             public char CreateEnOrNumChar()        {            return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)];        }        /// 
        /// 生成汉字字符        /// 
        /// 
             public char CreateZhChar()        {            //若提供了汉字集，查询汉字集选取汉字            if (ChineseChars.Length > 0)            {                return ChineseChars[rnd.Next(0, ChineseChars.Length)];            }            //若没有提供汉字集，则根据《GB2312简体中文编码表》编码规则构造汉字            else            {                byte[] bytes = new byte[2];                //第一个字节值在0xb0, 0xf7之间                bytes[0] = (byte)rnd.Next(0xb0, 0xf8);                //第二个字节值在0xa1, 0xfe之间                bytes[1] = (byte)rnd.Next(0xa1, 0xff);                //根据汉字编码的字节数组解码出中文汉字                string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);                return str1[0];            }        }        /// 
        /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）        /// 
        /// 图片路径        /// 如果扭曲则选择为True        /// 波形的幅度倍数，越大扭曲的程度越高，一般为3        /// 波形的起始相位，取值区间[0-2*PI)        /// 
             public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)        {            System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);            // 将位图背景填充为白色            System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);            graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);            graph.Dispose();            double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;            for (int i = 0; i < destBmp.Width; i++)            {                for (int j = 0; j < destBmp.Height; j++)                {                    double dx = 0;                    dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;                    dx += dPhase;                    double dy = Math.Sin(dx);                    // 取得当前点的颜色                    int nOldX = 0, nOldY = 0;                    nOldX = bXDir ? i + (int)(dy * dMultValue) : i;                    nOldY = bXDir ? j : j + (int)(dy * dMultValue);                    System.Drawing.Color color = srcBmp.GetPixel(i, j);                    if (nOldX >= 0 && nOldX < destBmp.Width                        && nOldY >= 0 && nOldY < destBmp.Height)                    {                        destBmp.SetPixel(nOldX, nOldY, color);                    }                }            }            return destBmp;        }        #region 生成验证码图片        /*        protected void GenerateVerifyImage()        {            VerifyCode vc = new VerifyCode();            string verifyCode = vc.CreateVerifyCode(4, 0);            Response.Clear();            System.Drawing.Bitmap img = vc.CreateImage(verifyCode);            if (img != null)            {                System.IO.MemoryStream ms = new System.IO.MemoryStream();                img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);                Response.ContentType = "image/jpeg";                Response.BinaryWrite(ms.GetBuffer());                img.Dispose();                ms.Close();                Response.End();            }        }*/        #endregion        #region 产生6位手机验证码        /// 
        /// 产生6位数字手机验证码        /// 
        /// 
             public string GeneratePhoneVerifyCode()        {            const int CodeLen = 6;            int[] array = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };            string Code = string.Empty;            int randomNum;            Random random = new Random();            for (int i = 0; i < CodeLen; i++)            {                randomNum = random.Next(array.Length);                Code += array[randomNum];            }           // return "111111";           return Code;        }        #endregion    }}