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这里是我根据gif图像格式想出来的判断gif图像尺寸的方法，请大家给点意见
up.htm
<html>
<body>
<form action="up.asp" enctype="multipart/form-data" method="post">
<table border=0 width=100% cellspacing="0">
<tr>
<td width="30%">请选择您要上传的gif图片:</td>
<td width="70%"><input type="file" name="pic" style="font-size:10pt;"></td>
</tr>
</table>
<p align="center"><input type="submit" value="提交" style="font-size:9pt;background-color:#54b060;color:white;">
</form>
</body>
</html>
up.asp
<%
formsize = request.totalbytes
formdata = request.binaryread( formsize )
bncrlf=chrb(13) & chrb(10)
divider=leftb(formdata,instrb(formdata,bncrlf)-1)
datastart=instrb(formdata,bncrlf & bncrlf)+4
dataend=instrb(datastart+1,formdata,divider)-datastart
image=midb(formdata,datastart,dataend)
head_version = ascb( midb( image,1,3 ) )
head_subversion = ascb( midb( image,4,3 ) )
head_width_l = ascb( midb( image,7,1 ) )
head_width_h = ascb( midb( image,8,1 ) )
head_height_l = ascb( midb( image,9,1 ) )
head_height_h = ascb( midb( image,10,1 ) )
head_colors = ascb( midb( image, 11, 1 ) )
head_width_h = head_width_h * 256
head_height_h = head_height_h * 256
head_colors = head_colors and &h07
response.write "图像大小为" & head_width_h + head_width_l & "x" & head_height_h + head_height_l _
& "x" & 2^( head_colors + 1 )
%>
