Open Folder Dialog in Delphi

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For as you know, Delphi does not really have a standard dialog for choosing a particular folder, like OpenFolderDialog. The function below uses ShellAPI and implements exactly the desired behaviour.

function GetFolderDialog(const ACaption: string; 
                      out ADirectory: string): boolean;
const
  BIF_NEWDIALOGSTYLE = $0040;
  BIF_NONEWFOLDERBUTTON = $0200;
 BIF_USENEWUI = BIF_NEWDIALOGSTYLE or BIF_EDITBOX;
var
  pWindowList: Pointer;
  tbsBrowseInfo: TBrowseInfo;
  pBuffer: PChar;
  iOldErrorMode: cardinal;
  pIemIDList: PItemIDList;
  pShellMalloc: IMalloc;
begin
  CoInitialize(nil);
  try
    Result := false;
    ADirectory := '''';
    FillChar(tbsBrowseInfo, sizeof(tbsBrowseInfo), 0);
    if (ShGetMalloc(pShellMalloc) = S_OK) 
                   and Assigned(pShellMalloc) then begin
      pBuffer := pShellMalloc.Alloc(MAX_PATH);
      try
        with tbsBrowseInfo do begin
          hwndOwner := Application.Handle;
          pidlRoot := nil;
         pszDisplayName := pBuffer;
          lpszTitle := PChar(ACaption);
          ulFlags := BIF_USENEWUI or 
                         BIF_RETURNONLYFSDIRS or 
                         BIF_NONEWFOLDERBUTTON;
          lParam := 0;
        end;
       pWindowList := DisableTaskWindows(0);
        iOldErrorMode := SetErrorMode(SEM_FAILCRITICALERRORS);
        try
          pIemIDList := ShBrowseForFolder(tbsBrowseInfo);
        finally
          SetErrorMode(iOldErrorMode);
          EnableTaskWindows(pWindowList);
        end;
        Result := Assigned(pIemIDList);
        if Result then begin
          ShGetPathFromIDList(pIemIDList, pBuffer);
          pShellMalloc.Free(pIemIDList);
          ADirectory := pBuffer;
        end;
      finally
        pShellMalloc.Free(pBuffer);
     end;
    end;
  finally
    CoUninitialize;
  end;
end;