c# .net 生成图片验证码的代码


            说明:  .net 万岁...  .net framework 的类库真是太强了, 用 GDI+ 可以干N多N多事情.   广告时间:  shawl.qiu C# CMS 系统 预计40天后开始编码, 现在逐步设计中, 免得到时求职说什么什么作品...唉.  PS: 今天求职真是惨不忍睹, 谁要招网页相关的请联系 13435580019, 邱先生.   什么地方俺都去, 工资只要能过活就行,  但是食宿问题得解决.  shawl.qiu  2007-02-01  http://blog.csdn.net/btbtd  class checkcode: 复制代码 代码如下:<%@ Page Language="C#" AutoEventWireup="True" %>   <%@ import Namespace="System.Drawing"%>   <%@ import Namespace="System.Drawing.Drawing2D"%>   <%@ import Namespace="System.Web"%>   <script runat="server">    private void Page_Load(object sender, System.EventArgs e)    {     String sRndStr=checkcode.rndStr(4);     checkcode.general(sRndStr);    }    /*-----------------------------------------------------------------------------------*\    * shawl.qiu c# .net checkcode class v1.0   \*-----------------------------------------------------------------------------------*/   //---------------------------------------------------------------------begin class checkcode   public class checkcode   {    //-----------------------------------begin event    public checkcode()    {    }    ~checkcode()    {    }    //-----------------------------------end event    //-----------------------------------begin public constant    //-----------------------begin about    public const String auSubject="shawl.qiu c# .net checkcode class";    public const String auVersion="v1.0";    public const String au="shawl.qiu";    public const String auEmail="shawl.qiu@gmail.com";    public const String auBlog="http://blog.csdn.net/btbtd";    public const String auCreateDate="2007-2-1";    //-----------------------end about    //-----------------------------------end public constant    //-----------------------------------begin public static method    public static void general(String sCc)    {     Int32 ccLen=sCc.Length;     String ccFtFm="Arial";     Int32 ccFtSz=12;     Int32 ccWidth=ccLen*ccFtSz+1;     Int32 ccHeight=ccFtSz+5;     using(Bitmap oImg = new Bitmap(ccWidth, ccHeight))     {      using(Graphics oGpc=Graphics.FromImage(oImg))      {       HatchBrush hBrush = new HatchBrush(HatchStyle.DashedVertical,         Color.Yellow, Color.Silver);        oGpc.FillRectangle(hBrush, 0, 0, ccWidth, ccWidth);       oGpc.DrawString(sCc,new System.Drawing.Font(ccFtFm,ccFtSz, FontStyle.Bold),        new System.Drawing.SolidBrush(Color.Black),0,0);        //-----------------------边框       Pen blackPen = new Pen(Color.Black, 1);       oGpc.DrawLine(blackPen, 0, ccHeight, 0, 0); // 左竖线       oGpc.DrawLine(blackPen, 0,0,ccWidth,0); // 顶横线       oGpc.DrawLine(blackPen, ccWidth-1,0,ccWidth-1,20); // 右竖线       oGpc.DrawLine(blackPen, 0, ccHeight-1, ccWidth, ccHeight-1); // 底横线       writeImg(oImg);      }     }    } // end public static void general    public static String rndStr(Int32 len)    {     String sTemp="";     String sForRnd="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";     String[] aRnd=sForRnd.Split(',');     Random oRnd=new Random();     Int32 iArLen=aRnd.Length;     for(Int32 i=0; i<len; i++)     {      sTemp+=aRnd[oRnd.Next(0,iArLen)];     }     return sTemp;    } // end public static String rndStr    //-----------------------------------end public static method    //-----------------------------------begin private static method    private static void writeImg(Bitmap oImg)    {     using(System.IO.MemoryStream ms=new System.IO.MemoryStream())     {      oImg.Save(ms,System.Drawing.Imaging.ImageFormat.Png);       HttpContext.Current.Response.ClearContent();        HttpContext.Current.Response.ContentType="image/Png";      HttpContext.Current.Response.BinaryWrite(ms.ToArray());     }    } // end private static void writeImg   }   //---------------------------------------------------------------------end class checkcode   </script>