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　asp 中处理文件上传以及删除时常用的自定义函数： 

<%
"建立文件夹函数
Function CreateFolder(strFolder)"参数为相对路径
"首选判断要建立的文件夹是否已经存在
Dim strTestFolder,objFSO
strTestFolder = Server.Mappath(strFolder)
Set objFSO = CreateObject("Scripting.FileSystemObject")
"检查文件夹是否存在
If not objFSO.FolderExists(strTestFolder) Then
"如果不存在则建立文件夹
objFSO.CreateFolder(strTestFolder)
End If
Set objFSO = Nothing
End function

"删除文件夹
Function DelFolder(strFolder)"参数为相对路径
strTestFolder = Server.Mappath(strFolder)
Set objFSO = CreateObject("Scripting.FileSystemObject")
"检查文件夹是否存在
If objFSO.FolderExists(strTestFolder) Then
objFSO.DeleteFolder(strTestFolder)
end if
Set objFSO = Nothing
End function

"创建文本文件
Function Createtextfile(fileurl,filecontent)"参数为相对路径和要写入文件的内容
Set objFSO = Server.CreateObject("Scripting.FileSystemObject")
Set fout = objFSO.CreateTextFile(Server.MapPath(fileurl))
fout.WriteLine filecontent
fout.close
Set objFSO = Nothing
End Function

"删除文件（适合所有文件）
Function Deltextfile(fileurl)"参数为相对路径
Set objFSO = CreateObject("Scripting.FileSystemObject")
fileurl = Server.MapPath(fileurl)
if objFSO.FileExists(fileurl) then "检查文件是否存在
objFSO.DeleteFile(Server.mappath(fileurl))
end if
Set objFSO = nothing
End Function

"建立图片文件并保存图片数据流
Function Createimage(fileurl,imagecontent)"参数为相对路径和文件内容
Set objStream = Server.CreateObject("ADODB.Stream") "建立ADODB.Stream对象，必须要ADO 2.5以上版本
objStream.Type =1 "以二进制模式打开
objStream.Open
objstream.write imagecontent "将字符串内容写入缓冲
objstream.SaveToFile server.mappath(fileurl),2 "-将缓冲的内容写入文件
objstream.Close()"关闭对象
set objstream=nothing
End Function

"远程获取文件数据
Function getHTTPPage(url)
"On Error Resume Next
dim http
set http=Server.createobject("Microsoft.XMLHTTP")
Http.open "GET",url,false
Http.send()
if Http.readystate<>4 then
exit function
end if
getHTTPPage=bytesToBSTR(Http.responseBody,"GB2312")
set http=nothing
If Err.number<>0 then
getHTTPPage = "服务器获取文件内容出错"
Err.Clear
End If
End function

Function BytesToBstr(body,Cset)
dim objstream
set objstream = Server.CreateObject("adodb.stream")
objstream.Type = 1
objstream.Mode =3
objstream.Open
objstream.Write body
objstream.Position = 0
objstream.Type = 2
objstream.Charset = Cset
BytesToBstr = objstream.ReadText
objstream.Close
set objstream = nothing
End Function

"获取图片数据流
Function getpic(url)
on error resume next
dim http
set http=server.createobject("MSXML2.XMLHTTP")"使用xmlhttp的方法来获得图片的内容
Http.open "GET",url,false
Http.send()
if Http.readystate<>4 then
exit function
end if
getpic=Http.responseBody
set http=nothing
if err.number<>0 then
getpic = "服务器获取文件内容出错"
err.Clear
End if
End Function

"打开文件（文本形式）
Function OpenFile(fileurl)"文件相对路径
Dim Filename,fso,hndFile
Filename = fileurl
Filename = Server.MapPath(Filename)
Set objfso = CreateObject("Scripting.FileSystemObject")
If objfso.FileExists(Filename) Then
set hndFile = objfso.OpenTextFile(Filename)
OpenFile = hndFile.ReadAll
Else
OpenFile = "文件读取错误"
End If
Set hndFile = Nothing
Set objfso = Nothing
End Function

"获得文件的后缀名
function getFileExtName(fileName)
dim pos
pos=instrrev(filename,".")
if pos>0 then
getFileExtName=mid(fileName,pos+1)
else
getFileExtName=""
end if
end function
%>

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