Как использовать Shell API SHBrowseForFolder 2

Автор: Анатолий

threadvar
  myDir: string;

function BrowseCallbackProc(hwnd: HWND; uMsg: UINT; lParam: LPARAM; lpData:
  LPARAM): integer; stdcall;
begin
  Result := 0;
  if uMsg = BFFM_INITIALIZED then
    SendMessage(hwnd, BFFM_SETSELECTION, 1, LongInt(PChar(myDir)))
end;

function SelectDirectory(const Caption: string; const Root: WideString;
  var Directory: string): Boolean;
var
  WindowList: Pointer;
  BrowseInf!
  o: TBrowseInfo;
  Buffer: PChar;
  RootItemIDList, ItemIDList: PItemIDList;
  ShellMalloc: IMalloc;
  IDesktopFolder: IShellFolder;
  Eaten, Flags: LongWord;
begin
  myDir := Directory;
  Result := False;
  FillChar(BrowseInfo, SizeOf(BrowseInfo), 0);
  if (ShGetMalloc(ShellMalloc) = S_OK) and (ShellMalloc <> nil) then
  begin
    Buffer := ShellMalloc.Alloc(MAX_PATH);
    try
      RootItemIDList := nil;
      if Root <> '' then
      begin
        SHGetDesktopFolder(IDesktopFolder);
        IDesktopFolder.ParseDisplayName(Application.Handle, nil,
          POleStr(Root), Eaten, RootItemIDList, Flags);
      end;
      with BrowseInfo do
      begin
        hwndOwner := Application.Handle;
        pidlRoot := RootItemIDList;
        pszDisplayName := Buffer;
        lpfn := @BrowseCallbackProc;
        lParam := Integer(PChar(Directory));
        lpszTitle := PChar(Caption);
        ulFlags := BIF_RETURNONLYFSDIRS or $0040 or BIF_EDITBOX or
        BIF_STATUSTEXT;
      end;
      WindowList := DisableTaskWindows(0);
      try
        ItemIDList := ShBrowseForFolder(BrowseInfo);
      finally
        EnableTaskWindows(WindowList);
      end;
      Result := ItemIDList <> nil;
      if Result then
      begin
        ShGetPathFromIDList(ItemIDList!
          , Buffer);
        ShellMalloc.Free(ItemIDList);
        Directory := Buffer;
      end;
    finally
      ShellMalloc.Free(Buffer);
    end;
  end;
end;