| 正文： |
- <%@ Page Language="C#" AutoEventWireup="True" %>
- <%@ import Namespace="System.Drawing"%>
- <%@ import Namespace="System.Drawing.Drawing2D"%>
- <%@ import Namespace="System.Text"%>
- <%@ import Namespace="System.Web"%>
- <script runat="server">
- private void Page_Load(object sender, System.EventArgs e)
- {
- String sRndStr=checkcode.rndStr(4);
- Session["GalleryCheckCode"]=sRndStr;
- checkcode.general(Session["GalleryCheckCode"]+"");
- }
- /*-----------------------------------------------------------------------------------*\
- * shawl.qiu c# .net checkcode class v1.1
- \*-----------------------------------------------------------------------------------*/
- //---------------------------------------------------------------------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="v1.1";
- 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="2007-2-7";
- //-----------------------end about
- //-----------------------------------end public constant
-
- //-----------------------------------begin public static method
- public static void general(String sCc)
- {
- Int32 ccLen=sCc.Length;
-
- String ccFtFm="Arial";
- Int32 ccFtSz=14;
-
- Int32 ccWidth=ccLen*ccFtSz+1;
- Int32 ccHeight=21;//ccFtSz+5;
-
- using(Bitmap oImg = new Bitmap(ccWidth, ccHeight))
- {
- using(Graphics oGpc=Graphics.FromImage(oImg))
- {
- using(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
- using(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,ccHeight); // 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;
-
- StringBuilder sb=new StringBuilder();
- for(Int32 i=0; i<len; i++)
- {
- sb.Append(aRnd[oRnd.Next(0,iArLen)]);
- }
-
- return sb.ToString();
- } // 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>
-
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