How to get folder path from Known folder GUID in Delphi

Question

I have a KNOWNFOLDERID and I would like to know the corresponding path like C:....\folder.

KNOWNFOLDERID can be found here. http://msdn.microsoft.com/en-us/library/bb762584%28VS.85%29.aspx

I d like to use win api (I don't want to build an array with all KNOWNFOLDERID and paths).

Thanks

Answer 1

Simply call the SHGetKnownFolderPath API function.

Since this function was added in Vista, it won't be declared in the library units that shipped with Delphi 7. So you'd need to declare it yourself.

type
  KNOWNFOLDERID = TGuid;

function SHGetKnownFolderPath(
  const rfid: KNOWNFOLDERID;
  dwFlags: DWORD; 
  hToken: THandle; 
  out ppszPath: PWideChar
): HResult; stdcall; external 'Shell32.dll';

Now, since this function was added in Vista, attempts to call it on XP will lead to failures. So, I would recommend dealing with this by using CSIDL functions rather than the Vista known folder APIs.