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)); } /// <summary> /// 生成随机字符码 /// </summary> /// <param name="codeLen">字符串长度</param> /// <param name="zhCharsCount">中文字符数</param> /// <returns></returns> 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] == ' ') { chs[index] = CreateZhChar(); } else { --i; } } for (int i = 0; i < codeLen; i++) { if (chs[i] == ' ') { chs[i] = CreateEnOrNumChar(); } } return new string(chs, 0, chs.Length); } /// <summary> /// 生成随机字符码 默认6位 /// </summary> /// <returns></returns> public string CreateVerifyCode() { return CreateVerifyCode(4, 0); } /// <summary> /// 生成校验码图片 /// </summary> /// <param name="verifyCode"></param> /// <returns></returns> 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; } /// <summary> /// 生成英文或数字字符 /// </summary> /// <returns></returns> public char CreateEnOrNumChar() { return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)]; } /// <summary> /// 生成汉字字符 /// </summary> /// <returns></returns> 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]; } } /// <summary> /// 正弦曲线Wave扭曲图片（Edit By 51aspx.com） /// </summary> /// <param name="srcBmp">图片路径</param> /// <param name="bXDir">如果扭曲则选择为True</param> /// <param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param> /// <param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param> /// <returns></returns> 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 /// <summary> /// 产生6位数字手机验证码 /// </summary> /// <returns></returns> 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 } }