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.
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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="[email protected]"; 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>