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ÔΣ¬delphi 7 ÓÐÁ½¸ö°æ±¾µÄ SelectDirectory

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unit QDialogs;
{$IFDEF LINUX}
function SelectDirectory(const Caption, Root: WideString;
  var Directory: WideString; ShowHidden: Boolean = False): Boolean;
{$ENDIF}
{$IFDEF MSWINDOWS}
function SelectDirectory(const Caption: string; const Root: WideString;
  out Directory: WideString): Boolean;
{$ENDIF}
{$IFDEF LINUX}
function SelectDirectory(const Caption, Root: WideString;
  var Directory: WideString; ShowHidden: Boolean = False): Boolean;
var
  Dlg: TDirSelDlg;
  SaveDir: string;
begin
  Dlg := TDirSelDlg.Create(Application);
  try
    SaveDir := Directory;
    Result := Dlg.GetDirectory(Caption, Root, Directory, ShowHidden);
  finally
    Dlg.Free;
  end;
end;
{$ENDIF}
function SelectDirectory(const Caption: string; const Root: WideString;
  out Directory: WideString): Boolean;
var
  WindowList: Pointer;
  BrowseInfo: TBrowseInfo;
  Buffer: PChar;
  RootItemIDList, ItemIDList: PItemIDList;
  ShellMalloc: IMalloc;
  IDesktopFolder: IShellFolder;
  Eaten, Flags: LongWord;
  ActiveWindow: HWND;
begin
  Result := False;
  Directory := '';
  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(0, nil,
          POleStr(Root), Eaten, RootItemIDList, Flags);
 


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