When a browser sends form data to the server, it uses one of two encodings method:

1. application/x-www-form-urlencoded. This encoding is default. Next VBS code is function, which lets you decode such data (reverse function for Server.URLEncode).

2. multipart/form-data - You can use Pure ASP file upload with progress to decode such forms.

Function URLDecode(ByVal What)
'URL decode Function
'2001 Antonin Foller, PSTRUH Software, http://www.motobit.com
  Dim Pos, pPos

  'replace + To Space
  What = Replace(What, "+", " ")

  on error resume Next
  Dim Stream: Set Stream = CreateObject("ADODB.Stream")
  If err = 0 Then 'URLDecode using ADODB.Stream, If possible
    on error goto 0
    Stream.Type = 2 'String
    Stream.Open

    'replace all %XX To character
    Pos = InStr(1, What, "%")
    pPos = 1
    Do While Pos > 0
      Stream.WriteText Mid(What, pPos, Pos - pPos) + _
        Chr(CLng("&H" & Mid(What, Pos + 1, 2)))
      pPos = Pos + 3
      Pos = InStr(pPos, What, "%")
    Loop
    Stream.WriteText Mid(What, pPos)

    'Read the text stream
    Stream.Position = 0
    URLDecode = Stream.ReadText

    'Free resources
    Stream.Close
  Else 'URL decode using string concentation
    on error goto 0
    'UfUf, this is a little slow method. 
    'Do Not use it For data length over 100k
    Pos = InStr(1, What, "%")
    Do While Pos>0 
      What = Left(What, Pos-1) + _
        Chr(Clng("&H" & Mid(What, Pos+1, 2))) + _
        Mid(What, Pos+3)
      Pos = InStr(Pos+1, What, "%")
    Loop
    URLDecode = What
  End If
End Function

See also for 'URLDecode function' article:

Post large form data to ASP - Request.Form and stack overflow error? This article shows a way to work with request.form fields with any size, without 'Stack overflow' error.

If you like this page, please include next link on your pages:

<A
 Href="http://www.motobit.com/tips/detpg_URLDecode/"
 Title="VBS source code to decode URL
  encoded strings (reverse to Server.URLEncode)"
>URLDecode function</A>

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