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@@ -1,5 +1,7 @@
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using System;
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using System.Collections.Generic;
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+using System.Drawing;
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+using System.Drawing.Imaging;
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using System.Linq;
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using System.Web;
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@@ -7,6 +9,273 @@ namespace PersonalBlog.App_Code
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{
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public class ValidateCode
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{
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+ #region 使用实例
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+ //ValidateCode v = new ValidateCode();
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+ //string code = v.CreateVerifyCode(); //取随机码
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+ //v.CreateImageOnPage(code, this.Context); // 输出图片
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+ //Session ["CheckCode"] = code;
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+ #endregion
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+ #region 验证码长度(默认6个验证码的长度)
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+ int length = 4;
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+ public int Length
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+ {
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+ get { return length; }
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+ set { length = value; }
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+ }
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+ #endregion
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+
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+ #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)
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+ int fontSize = 40;
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+ public int FontSize
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+ {
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+ get { return fontSize; }
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+ set { fontSize = value; }
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+ }
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+ #endregion
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+
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+ #region 边框补(默认1像素)
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+ int padding = 2;
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+ public int Padding
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+ {
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+ get { return padding; }
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+ set { padding = value; }
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+ }
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+ #endregion
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+
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+ #region 是否输出燥点(默认不输出)
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+ bool chaos = true;
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+ public bool Chaos
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+ {
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+ get { return chaos; }
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+ set { chaos = value; }
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+ }
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+ #endregion
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+
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+ #region 输出燥点的颜色(默认灰色)
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+ Color chaosColor = Color.LightGray;
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+ public Color ChaosColor
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+ {
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+ get { return chaosColor; }
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+ set { chaosColor = value; }
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+ }
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+ #endregion
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+
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+ #region 自定义背景色(默认白色)
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+ Color backgroundColor = Color.White;
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+ public Color BackgroundColor
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+ {
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+ get { return backgroundColor; }
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+ set { backgroundColor = value; }
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+ }
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+ #endregion
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+
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+ #region 自定义随机颜色数组
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+ Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
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+ public Color[] Colors
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+ {
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+ get { return colors; }
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+ set { colors = value; }
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+ }
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+ #endregion
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+
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+ #region 自定义字体数组
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+ string[] fonts = { "Arial", "Georgia" };
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+ public string[] Fonts
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+ {
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+ get { return fonts; }
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+ set { fonts = value; }
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+ }
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+ #endregion
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+
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+ #region 自定义随机码字符串序列(使用逗号分隔)
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+ 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";
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+ public string CodeSerial
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+ {
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+ get { return codeSerial; }
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+ set { codeSerial = value; }
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+ }
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+ #endregion
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+
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+ #region 产生波形滤镜效果
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+
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+ private const double PI = 3.1415926535897932384626433832795;
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+ private const double PI2 = 6.283185307179586476925286766559;
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+
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+ /// <summary>
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+ /// 正弦曲线Wave扭曲图片(Edit By 51aspx.com)
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+ /// </summary>
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+ /// <param name="srcBmp">图片路径</param>
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+ /// <param name="bXDir">如果扭曲则选择为True</param>
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+ /// <param name="nMultValue">波形的幅度倍数,越大扭曲的程度越高,一般为3</param>
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+ /// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>
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+ /// <returns></returns>
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+ public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
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+ {
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+ System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
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+ // 将位图背景填充为白色
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+ System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
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+ graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
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+ graph.Dispose();
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+
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+ double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
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+
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+ for (int i = 0; i < destBmp.Width; i++)
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+ {
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+ for (int j = 0; j < destBmp.Height; j++)
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+ {
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+ double dx = 0;
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+ dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
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+ dx += dPhase;
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+ double dy = Math.Sin(dx);
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+
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+ // 取得当前点的颜色
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+ int nOldX = 0, nOldY = 0;
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+ nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
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+ nOldY = bXDir ? j : j + (int)(dy * dMultValue);
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+
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+ System.Drawing.Color color = srcBmp.GetPixel(i, j);
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+ if (nOldX >= 0 && nOldX < destBmp.Width
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+ && nOldY >= 0 && nOldY < destBmp.Height)
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+ {
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+ destBmp.SetPixel(nOldX, nOldY, color);
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+ }
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+ }
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+ }
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+
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+ return destBmp;
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+ }
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+
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+
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+
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+ #endregion
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+
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+ #region 生成校验码图片
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+ public Bitmap CreateImageCode(string code)
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+ {
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+ int fSize = FontSize;
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+ int fWidth = fSize + Padding;
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+
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+ int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
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+ int imageHeight = fSize * 2 + Padding;
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+
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+ System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
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+
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+ Graphics g = Graphics.FromImage(image);
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+
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+ g.Clear(BackgroundColor);
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+
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+ Random rand = new Random();
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+
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+ //给背景添加随机生成的燥点
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+ if (this.Chaos)
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+ {
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+
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+ Pen pen = new Pen(ChaosColor, 0);
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+ int c = Length * 10;
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+
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+ for (int i = 0; i < c; i++)
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+ {
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+ int x = rand.Next(image.Width);
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+ int y = rand.Next(image.Height);
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+
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+ g.DrawRectangle(pen, x, y, 1, 1);
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+ }
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+ }
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+
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+ int left = 0, top = 0, top1 = 1, top2 = 1;
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+
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+ int n1 = (imageHeight - FontSize - Padding * 2);
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+ int n2 = n1 / 4;
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+ top1 = n2;
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+ top2 = n2 * 2;
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+
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+ Font f;
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+ Brush b;
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+
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+ int cindex, findex;
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+
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+ //随机字体和颜色的验证码字符
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+ for (int i = 0; i < code.Length; i++)
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+ {
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+ cindex = rand.Next(Colors.Length - 1);
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+ findex = rand.Next(Fonts.Length - 1);
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+
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+ f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
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+ b = new System.Drawing.SolidBrush(Colors[cindex]);
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+
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+ if (i % 2 == 1)
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+ {
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+ top = top2;
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+ }
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+ else
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+ {
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+ top = top1;
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+ }
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+
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+ left = i * fWidth;
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+
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+ g.DrawString(code.Substring(i, 1), f, b, left, top);
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+ }
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+
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+ //画一个边框 边框颜色为Color.Gainsboro
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+ g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
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+ g.Dispose();
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+
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+ //产生波形(Add By 51aspx.com)
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+ image = TwistImage(image, true, 8, 4);
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+
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+ return image;
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+ }
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+ #endregion
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+
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+ #region 将创建好的图片输出到页面
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+ public void CreateImageOnPage(string code, HttpContext context)
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+ {
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+ System.IO.MemoryStream ms = new System.IO.MemoryStream();
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+ Bitmap image = this.CreateImageCode(code);
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+
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+ image.Save(ms, ImageFormat.Jpeg);
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+ context.Response.ClearContent();
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+ context.Response.ContentType = "image/Jpeg";
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+ context.Response.BinaryWrite(ms.GetBuffer());
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+
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+ ms.Close();
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+ ms = null;
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+ image.Dispose();
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+ image = null;
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+ }
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+ #endregion
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+
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+ #region 生成随机字符码
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+ public string CreateVerifyCode(int codeLen)
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+ {
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+ if (codeLen == 0)
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+ {
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+ codeLen = Length;
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+ }
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+
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+ string[] arr = CodeSerial.Split(',');
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+
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+ string code = "";
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+
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+ int randValue = -1;
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+
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+ Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
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+
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+ for (int i = 0; i < codeLen; i++)
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+ {
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+ randValue = rand.Next(0, arr.Length - 1);
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+
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+ code += arr[randValue];
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+ }
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+
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+ return code;
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+ }
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+ public string CreateVerifyCode()
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+ {
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+ return CreateVerifyCode(0);
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+ }
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+ #endregion
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}
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}
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