<%@ Page Language="vb" Debug="True" %>
 <%@ import namespace="system.drawing" %>
 <%@ import namespace="system.drawing.imaging" %>
 <%@ import namespace="system.drawing.drawing2d" %>
 <% ''''''''''''''''''''''''''''
    '让Asp.Net输出图形.
    '欧阳东杰(oydj)原创.
    'QQ:2596812
    'E-mail:loved@vip.sina.com
    'MSN:xzskyweb@hotmail.com
    '欢迎大家联系我交流技术
    '''''''''''''''''''''''''''''

 dim strFilename as string '声明变量,用于图片路径
 dim i as System.Drawing.Image '创建.net框架图像处理对象实例
dim imgg1  as Integer =CInt(Int((6 * Rnd()) + 1)) '生成1-6的随机数
dim oydj as string=imgg1

 strFilename ="d:\o123\"+oydj+".jpg" '载入的图片路径,这里的oydj代表随机生成的变量,用于生成随机图片
 
 i = System.Drawing.Image.FromFile(strFilename)
 
 dim b as New system.drawing.bitmap(i.width, i.height, pixelformat.format24bpprgb)
 dim g as graphics = graphics.fromimage(b)
 
 g.clear(color.blue) '背景色为蓝色
 

dim sss=Request.ServerVariables("REMOTE_ADDR")
 g.drawimage(i,New point(0,0))
 '这里表示生成一个字符,9号宋体加粗白色,pointF(160,50)为在屏幕的坐标
g.drawString(sss, New font("宋体",9,fontstyle.bold),new SolidBrush(Color.White),New pointF(160,50))
g.drawString(sss, New font("宋体",9,fontstyle.bold),new SolidBrush(Color.White),New pointF(161,51))
 

 
 response.contenttype="image/jpeg" '指定输出格式为图形
 
 b.save(response.outputstream, imageformat.jpeg)
 
 b.dispose()
 
 %>

代码演示

http://www.ift99.com/pic3.aspx