asp利用xmlhttp下载远程图片

<%
function getHTTPimg(url)
on error resume next
dim http
set http=server.createobject("MSXML2.XMLHTTP")
Http.open "GET",url,false
Http.send()
if Http.readystate<>4 then exit function
getHTTPimg=Http.responseBody
set http=nothing
if err.number<>0 then err.Clear
end function
function Save2Local(from,tofile)
dim geturl,objStream,imgs
geturl=trim(from)
imgs=gethttpimg(geturl)
Set objStream = Server.CreateObject("ADODB.Stream")
objStream.Type =1
objStream.Open
objstream.write imgs
objstream.SaveToFile tofile,2
objstream.Close()
set objstream=nothing
end function
%>
<%
call Save2Local(serverurl&picarray(i),picpath&"web\"&filename&".jpg")
%>