c#高性能在WEB端产生验证图片

using System;

using System.Web;

using System.Drawing ;

/// <summary>

/// Png 的摘要说明。

public sealed class LocalPng:IHttpHandler

{

#region IHttpHandler 成员

public void ProcessRequest(HttpContext context)

{

if(context.Request["key"]!=null&&context.Request["key"].Length ==4)//还有ACSSI码是1-9的数字和a-z的字母

{

string machine_key=context.Request["key"];

context.Response.Clear();

try

{ //原图

Bitmap sImage = new Bitmap(context.Server.MapPath("key.png.bmp")); //图片路径

//验证码图

Graphics wg = Graphics.FromImage(sImage);

wg.DrawString(machine_key,new Font("Comic Sans MS",14),new SolidBrush(Color.RoyalBlue),3,0);

wg.Save();

context.Response.ContentType = "image/Jpeg";

sImage.Save(context.Response.OutputStream,System.Drawing.Imaging.ImageFormat.Jpeg);

wg.Dispose();

sImage.Dispose();

}

catch(Exception e)

{context.Response.Write(e.Message);

}

context.Response.End();

}

}

public bool IsReusable

{

get

{

// TODO: 添加 CodeKey.IsReusable getter 实现

return false;

}

}

#endregion

}