判断gif图像尺寸的方法

March 25,2004

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 )

%>