... void schreibe_nachricht() { var window = new Gtk.Window (Gtk.WindowType.TOPLEVEL); window.set_default_size (400, 50); window.destroy.connect (Gtk.main_quit); window.add(new Gtk.Label(nachricht)); window.show_all(); } ... Gtk.init(ref args); bsp.schreibe_nachricht(); Gtk.main(); return 0; } ...