c# .net 生成图片验证码 By shawl.qiu

最新推荐文章于 2025-08-06 16:22:52 发布

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文章标签：

#.net #c# #string #import #random #gdi+

本文介绍了一个使用C#和.NET Framework生成图片验证码的方法。通过GDI+库，该方法能够创建包含随机字符的验证码图片，并将其输出为PNG格式。

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c# .net 生成图片验证码 By shawl.qiu

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.youkuaiyun.com/btbtd

class checkcode:

<%@ 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.youkuaiyun.com/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>