windows 图片处理

// 一般处理程序
<%@WebHandler Language="C#" Class="Tupian1" %>
using System;
using System.Web;

public class TuPian1 : IHttpHandler{
    public void RrocessRequest (HttpContext context){
       context.Response.ContentType="image/JPEG";
 
       string fullpath=HttpContext.Current.Server.MapPath("....JPG");
       using(System.Drawing.Bitmap bitmap=new System.Drawing.Bitmap(fullpath){

       using(System.Drawing.Graphics g=System.Drawing.Graphics.FromImage(bitmap){

              if(context.Request.UrlReferrer==null)

               {

                    g.Clear(System.Drawing.Color.White);

                     g.DrawString("禁止直接浏览，请在页面查看",new System.Drawing.Font("宋体",30),System.Drawing.Brushes.Red,0,0);

              }

         }

               else  if(context.Request.UrlReferrer.Host!="localhost")

               {

                    g.Clear(System.Drawing.Color.White);

                     g.DrawString("禁止直接浏览，请在页面查看",new System.Drawing.Font("宋体",30),System.Drawing.Brushes.Red,0,0);

              }

           bitmap.Save(context.Response.OutputStream,System.Drawing.Imageing.ImageFormat.Jpeg);
 }
}