Savoir si l'écran de veille est activé

function ScreenSaverEnabled : Boolean;
var
status: Bool;
begin
SystemParametersInfo( SPI_GETSCREENSAVEACTIVE, 0, @status, 0);
Result := status = true;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
If ScreenSaverEnabled then
Caption := 'Screensaver is enabled'
Else
Caption := 'Screensaver is disabled'
end;