Button in einer anderen anwendung enablen

[toms]

Delphi-Quellcode:

function EnumChildProc(Wnd: hWnd; SL: TStrings): BOOL; stdcall;
var
  szFull: array[0..MAX_PATH] of Char; //Buffer for window caption
begin
  Result := Wnd <> 0; 
  if Result then
  begin
    GetWindowText(Wnd, szFull, SizeOf(szFull)); // put window text in buffer
    if (Pos(SL[0], StrPas(szFull)) > 0) // Test for text 
      and (SL.IndexOfObject(TObject(Wnd)) < 0) // Test for duplicate handles
      then SL.AddObject(StrPas(szFull), TObject(Wnd)); // Add item to list 
    EnumChildWindows(Wnd, @EnumChildProc, Longint(SL)); //Recurse into child windows
  end;
end;

function EnableButton(ParentWindow: Hwnd; ButtonCaption: string; Enabled: Boolean): Boolean;
var
  SL: TStringList;
  H:  hWnd;
begin
  SL := TStringList.Create;
  try
    SL.AddObject(ButtonCaption, nil); // First item in list is text to find
    EnumChildWindows(ParentWindow, @EnumChildProc, Longint(SL));
    H := 0;
    case SL.Count of
      1: ShowMessage('Window text not found.');
      2: H := hWnd(SL.Objects[1]);
      else
        ShowMessage('Ambiguous text detected.');
    end;
  finally
    SL.Free;
  end;
  Result := H <> 0;
  if Result then
    EnableWindow(H, Enabled);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  EnableButton(HANDLE_DES_FENSTERS {z.B FindWindow Suchen},'OK', True);
end;