C#.Net2.0 完美随机验证码 0.10版本

 花了两晚上的时间，昨天花2小时搞定生成普通的验证码

 

今天晚上花4个小时左右的时间来旋转字体和显示正确上了。

打算下一版加上随机噪点。好了，要睡了！哈哈哈哈~~~

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;


namespace  Test
...{
        /**////  <summary>
        ///  完美随机验证码  0.10  
        ///  Author                          :              zhouyu   http://max.cszi.com
        ///  Verion                          :              0.10
        ///  Update                        :              2007-10-9
        ///  Description            :              随机生成设定验证码，并随机旋转一定角度
        ///  </summary>
        public  partial  class  ValidateCode  :  System.Web.UI.Page
        ...{

                protected  void  Page_Load(object  sender,  EventArgs  e)
                ...{
                        string  randomcode  =  this.CreateRandomCode(4);
                        Session["ValidateCode"]  =  randomcode;
                        //ViewState["ValidateCode"]  =  randomcode;
                        this.CreateImage(randomcode);
                }

                /**////  <summary>
                ///  生成随机码
                ///  </summary>
                ///  <param  name="length">随机码个数</param>
                ///  <returns></returns>
                private  string  CreateRandomCode(int  length)
                ...{
                        int  rand;
                        char  code;
                        string  randomcode  =  String.Empty;

                        //生成一定长度的验证码
                        System.Random  random  =  new  Random();
                        for  (int  i  =  0;  i  <  length;  i++)
                        ...{
                                rand  =  random.Next();

                                if  (rand  %  3  ==  0)
                                ...{  code  =  (char)('A'  +  (char)(rand  %  26));  }
                                else
                                ...{  code  =  (char)('0'  +  (char)(rand  %  10));  }

                                randomcode  +=  code.ToString();
                        }
                        return  randomcode;
                }


                /**////  <summary>
                ///  创建随机码图片
                ///  </summary>
                ///  <param  name="randomcode">随机码</param>
                private  void  CreateImage(string  randomcode)
                ...{
                        int  randAngle  =  45;            //随机转动角度
                        int  mapwidth  =  (int)(randomcode.Length  *  22);
                        Bitmap  map  =  new  Bitmap(mapwidth,  28);                            //创建图片背景
                        Graphics  graph  =  Graphics.FromImage(map);
                        //Font  fontstyle  =  new  Font("Arial",  20,  FontStyle.Bold);            //字体样式
                        //graph.FillRectangle(new  SolidBrush(Color.Black),  0,  0,  map.Width+1,  map.Height+1);          //填充一个有背景的矩形
                        graph.Clear(Color.AliceBlue);              //清除画面，填充背景
                        //graph.DrawRectangle(new  Pen(Color.Black,  0),  0,  0,  map.Width  -  1,  map.Height  -  1);              //画一个边框
                        //graph.SmoothingMode  =  System.Drawing.Drawing2D.SmoothingMode.AntiAlias;        //模式
                        

                        Random  rand  =  new  Random();

                        //背景噪点生成
                        //Pen  blackPen  =  new  Pen(Color.Black,  0);
                        //for  (int  i  =  0;  i  <  2000;  i++)
                        //{
                        //        int  x  =  rand.Next(0,  map.Width);
                        //        int  y  =  rand.Next(0,  map.Height);
                        //        graph.DrawRectangle(blackPen,  x,  y,    1,  1);

                        //}

                        //验证码旋转，防止机器识别
                        char[]  chars  =  randomcode.ToCharArray();            //拆散字符串成单字符数组

                        //文字距中
                        StringFormat  format  =  new  StringFormat(StringFormatFlags.NoClip);
                        format.Alignment  =  StringAlignment.Center;
                        format.LineAlignment  =  StringAlignment.Center;

                        for  (int  i  =  0;  i  <  chars.Length;  i++)
                        ...{
                                Font  fontstyle  =  new  Font("Arial",  rand.Next(20,22),  FontStyle.Regular);            //字体样式
                                Point  dot  =  new  Point(16,  16);
                                //graph.DrawString(dot.X.ToString(),  fontstyle,  new  SolidBrush(Color.Black),  10,  150);                //测试X坐标显示间距的
                                float  angle  =  rand.Next(-randAngle,  randAngle);            //转动的度数

                                graph.TranslateTransform(dot.X,  dot.Y);          //移动光标到指定位置
                                graph.RotateTransform(angle);                              
                                graph.DrawString(chars[i].ToString(),  fontstyle,  new  SolidBrush(Color.Blue),    1  ,  1  ,  format  );
                                graph.RotateTransform(-angle);                    //转回去
                                graph.TranslateTransform(2,  -dot.Y);          //移动光标到指定位置
                        }
                        //graph.DrawString(randomcode,  fontstyle,  new  SolidBrush(Color.Blue),  2,  2);                    //标准随机码
                        
                        //生成图片
                        System.IO.MemoryStream  ms  =  new  System.IO.MemoryStream();
                        map.Save(ms,  System.Drawing.Imaging.ImageFormat.Gif);
                        Response.ClearContent();
                        Response.ContentType  =  "image/gif";
                        Response.BinaryWrite(ms.ToArray());
                        graph.Dispose();
                        map.Dispose();
                }



        }

}