asp 中處理文件上傳以及刪除時常用的自定義函數(shù)： 

<%
'建立文件夾函數(shù)
Function CreateFolder(strFolder)'參數(shù)為相對路徑
'首選判斷要建立的文件夾是否已經(jīng)存在
Dim strTestFolder,objFSO
strTestFolder = Server.Mappath(strFolder)
Set objFSO = CreateObject("Scripting.FileSystemObject")
'檢查文件夾是否存在
If not objFSO.FolderExists(strTestFolder) Then
'如果不存在則建立文件夾
objFSO.CreateFolder(strTestFolder)
End If
Set objFSO = Nothing
End function

'刪除文件夾
Function DelFolder(strFolder)'參數(shù)為相對路徑
strTestFolder = Server.Mappath(strFolder)
Set objFSO = CreateObject("Scripting.FileSystemObject")
'檢查文件夾是否存在
If objFSO.FolderExists(strTestFolder) Then
objFSO.DeleteFolder(strTestFolder)
end if
Set objFSO = Nothing
End function

'創(chuàng)建文本文件
Function Createtextfile(fileurl,filecontent)'參數(shù)為相對路徑和要寫入文件的內(nèi)容
Set objFSO = Server.CreateObject("Scripting.FileSystemObject")
Set fout = objFSO.CreateTextFile(Server.MapPath(fileurl))
fout.WriteLine filecontent
fout.close
Set objFSO = Nothing
End Function

'刪除文件（適合所有文件）
Function Deltextfile(fileurl)'參數(shù)為相對路徑
Set objFSO = CreateObject("Scripting.FileSystemObject")
fileurl = Server.MapPath(fileurl)
if objFSO.FileExists(fileurl) then '檢查文件是否存在
objFSO.DeleteFile(Server.mappath(fileurl))
end if
Set objFSO = nothing
End Function

'建立圖片文件并保存圖片數(shù)據(jù)流
Function Createimage(fileurl,imagecontent)'參數(shù)為相對路徑和文件內(nèi)容
Set objStream = Server.CreateObject("ADODB.Stream") '建立ADODB.Stream對象，必須要ADO 2.5以上版本
objStream.Type =1 '以二進制模式打開
objStream.Open
objstream.write imagecontent '將字符串內(nèi)容寫入緩沖
objstream.SaveToFile server.mappath(fileurl),2 '-將緩沖的內(nèi)容寫入文件
objstream.Close()'關(guān)閉對象
set objstream=nothing
End Function

'遠程獲取文件數(shù)據(jù)
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 = "服務(wù)器獲取文件內(nèi)容出錯"
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

'獲取圖片數(shù)據(jù)流
Function getpic(url)
on error resume next
dim http
set http=server.createobject("MSXML2.XMLHTTP")'使用xmlhttp的方法來獲得圖片的內(nèi)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 = "服務(wù)器獲取文件內(nèi)容出錯"
err.Clear
End if
End Function

'打開文件（文本形式）
Function OpenFile(fileurl)'文件相對路徑
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 = "文件讀取錯誤"
End If
Set hndFile = Nothing
Set objfso = Nothing
End Function

'獲得文件的后綴名
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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