getwindowtext not retrieving text

Question

I tried the following code but it does not retrieve text from foreground window!

procedure TForm1.Button1Click(Sender: TObject);
 var
  title : pansichar;
  s : string;
begin
    GetWindowText(GetForegroundWindow(), title,GetWindowTextLength(GetForegroundWindow()) + 1);
    s := title;
    showmessage(s);
end;

Answer 1

Replace this line:

  title : pansichar;

with this:

  title: array[0..255] of Char;

Answer 2

Try this code

procedure TForm1.Button1Click(Sender: TObject);
 var
  title : array[0..254] of Char;
  s : string;
begin
    GetWindowText(GetForegroundWindow(), title,255);
    s := title;
    showmessage(s);
end;

Bye.

Answer 3

Use this one:

var
  hwndForeground: HWND;
  titleLength: Integer;
  title: string;
begin
  hwndForeground := GetForegroundWindow();
  titleLength := GetWindowTextLength(hwndForeground);
  SetLength(title, titleLength);
  GetWindowText(hwndForeground, PChar(title), titleLength + 1);
  title := PChar(title);

  ShowMessage(title);
end;

Answer 4

Can it be, that you have this issue?

Answer 5

procedure TForm1.Button1Click(Sender: TObject);
var
  liHwnd, liLength : Integer;
  lpChar : PChar;
begin
  liHwnd := GetForegroundWindow();
  liLength := GetWindowTextLength(liHwnd) + 1;
  lpChar := StrAlloc(liLength);
  Try
    GetWindowText(liHwnd, lpChar, liLength);

    showmessage(lpChar);
  Finally
    StrDispose(lpChar);
  End;
end;