用流(stream)技术做下载

function dl(f,n)

on error resume next

Set S=CreateObject("Adodb.Stream")

S.Mode=3

S.Type=1

S.Open

S.LoadFromFile(f)

if Err.Number>0 then

Response.Status="404"

else

Response.ContentType="application/octet-stream"

Response.AddHeader "Content-Disposition:","attachment; filename=" & n

Range=Mid(Request.ServerVariables("HTTP_RANGE"),7)

if Range="" then

Response.BinaryWrite(S.Read)

else

S.position=Clng(Split(Range,"-")(0))

Response.BinaryWrite(S.Read)

End if

end if

Response.End

end function

函数使用示例：

call dl(Server.MapPath("../download/07.zip"),"07.zip")