using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Drawing; public partial class inc_ValidCode : System.Web.UI.Page {     protected void Page_Load(object sender, EventArgs e)     {         VerifyCode v = new VerifyCode();         v.Length = 4;         v.FontSize = 14;         v.Chaos = true;         v.BackgroundColor = Color.White;         v.ChaosColor = Color.LightGray;         //v.CodeSerial = "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,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";         //v.Colors = this.colors;``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````         //v.Fonts = this.fonts;         v.Padding = 2;         string code = v.CreateVerifyCode();                //取随机码         v.CreateImageOnPage(code, this.Context);        // 输出图片         //Response.Cookies.Add(new HttpCookie("fcvalidtcode", code.ToUpper()));// 使用Cookies取验证码的值         Session["bao_code"] = code.ToUpper();     }     public class VerifyCode     {         #region 验证码长度(默认6个验证码的长度)#region 验证码长度(默认6个验证码的长度)         int length = 6;         public int Length         {             get { return length; }             set { length = value; }         }         #endregion         #region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)#region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)         int fontSize = 30;         public int FontSize         {             get { return fontSize; }             set { fontSize = value; }         }         #endregion         #region 边框补(默认1像素)#region 边框补(默认1像素)         int padding = 2;         public int Padding         {             get { return padding; }             set { padding = value; }         }         #endregion         #region 是否输出燥点(默认不输出)#region 是否输出燥点(默认不输出)         bool chaos = true;         public bool Chaos         {             get { return chaos; }             set { chaos = value; }         }         #endregion         #region 输出燥点的颜色(默认灰色)#region 输出燥点的颜色(默认灰色)         Color chaosColor = Color.LightGray;         public Color ChaosColor         {             get { return chaosColor; }             set { chaosColor = value; }         }         #endregion         #region 自定义背景色(默认白色)#region 自定义背景色(默认白色)         Color backgroundColor = Color.White;         public Color BackgroundColor         {             get { return backgroundColor; }             set { backgroundColor = value; }         }         #endregion         #region 自定义随机颜色数组#region 自定义随机颜色数组         Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };         public Color[] Colors         {             get { return colors; }             set { colors = value; }         }         #endregion         #region 自定义字体数组#region 自定义字体数组         string[] fonts = { "Arial", "Georgia" };         public string[] Fonts         {             get { return fonts; }             set { fonts = value; }         }         #endregion         #region 自定义随机码字符串序列(使用逗号分隔)#region 自定义随机码字符串序列(使用逗号分隔)         string codeSerial = "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,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";         public string CodeSerial         {             get { return codeSerial; }             set { codeSerial = value; }         }         #endregion         #region 产生波形滤镜效果#region 产生波形滤镜效果         private const double PI = 3.1415926535897932384626433832795;         private const double PI2 = 6.283185307179586476925286766559;         /**/         /// <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;         }         #endregion         #region 生成校验码图片#region 生成校验码图片         public Bitmap CreateImageCode(string code)         {             int fSize = FontSize;             int fWidth = fSize + Padding;             int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;             int imageHeight = fSize * 2 + Padding;             System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);             Graphics g = Graphics.FromImage(image);             g.Clear(BackgroundColor);             Random rand = new Random();             //给背景添加随机生成的燥点             if (this.Chaos)             {                 Pen pen = new Pen(ChaosColor, 0);                 int c = Length * 10;                 for (int i = 0; i < c; i++)                 {                     int x = rand.Next(image.Width);                     int y = rand.Next(image.Height);                     g.DrawRectangle(pen, x, y, 1, 1);                 }             }             int left = 0, top = 0, top1 = 1, top2 = 1;             int n1 = (imageHeight - FontSize - Padding * 2);             int n2 = n1 / 4;             top1 = n2;             top2 = n2 * 2;             Font f;             Brush b;             int cindex, findex;             //随机字体和颜色的验证码字符             for (int i = 0; i < code.Length; i++)             {                 cindex = rand.Next(Colors.Length - 1);                 findex = rand.Next(Fonts.Length - 1);                 f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);                 b = new System.Drawing.SolidBrush(Colors[cindex]);                 if (i % 2 == 1)                 {                     top = top2;                 }                 else                 {                     top = top1;                 }                 left = i * fWidth;                 g.DrawString(code.Substring(i, 1), f, b, left, top);             }             //画一个边框 边框颜色为Color.Gainsboro             g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);             g.Dispose();             //产生波形（Add By 51aspx.com）             image = TwistImage(image, true, 0, 4);             return image;         }         #endregion         #region 将创建好的图片输出到页面#region 将创建好的图片输出到页面         public void CreateImageOnPage(string code, HttpContext context)         {             System.IO.MemoryStream ms = new System.IO.MemoryStream();             Bitmap image = this.CreateImageCode(code);             image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);             context.Response.ClearContent();             context.Response.ContentType = "image/Jpeg";             context.Response.BinaryWrite(ms.GetBuffer());             ms.Close();             ms = null;             image.Dispose();             image = null;         }         #endregion         #region 生成随机字符码#region 生成随机字符码         public string CreateVerifyCode(int codeLen)         {             if (codeLen == 0)             {                 codeLen = Length;             }             string[] arr = CodeSerial.Split(',');             string code = "";             int randValue = -1;             Random rand = new Random(unchecked((int)DateTime.Now.Ticks));             for (int i = 0; i < codeLen; i++)             {                 randValue = rand.Next(0, arr.Length - 1);                 code += arr[randValue];             }             return code;         }         public string CreateVerifyCode()         {             return CreateVerifyCode(0);         }         #endregion     } }