get_resolution

["sundaresh venugopal" <sundaresh mail com>]

For the below program I get the error get_resolution is not a member of Gdk::Screen.
What is the error ?

int main(int argc, char *argv[]) {
        Gtk::Main kit(argc, argv);
        mywindow window;
        Glib::RefPtr<Gdk::Screen> ptr;
        Gdk::Screen *screen;
        double resolution;

        window.set_decorated(true);
        ptr = window.get_screen();
      resolution = ptr->get_resolution();
        window.fullscreen(); 
        Gtk::Main::run(window);

        return 0;
}

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