gtk+ Закрыть окно

g_signal_connect( win->exif_button, "clicked", G_CALLBACK(on_delete_event), win->exif_window );

gboolean on_delete_event( GtkWidget* widget, GdkEventAny* evt )
{
    return TRUE;
}

gboolean on_delete_event( GtkWidget* widget, GdkEventAny* evt, gpointer data )
{
    GList* window_list = gtk_window_list_toplevels();
        gtk_widget_destroy( g_list_nth_data(window_list,5));
    g_list_foreach (window_list, (GFunc)g_object_ref, NULL);
    
    return TRUE;
}

g_signal_connect( win->exif_button, "clicked", G_CALLBACK(on_delete_event), gpointer(win->exif_window));
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void on_delete_event( GtkWidget* widget, GdkEventAny* evt,  GtkWidget* window)
{
    gtk_widget_destroy(window); //либо gtk_widget_hide(window), если дочернее окно создаваться будет 
                                            //единожды, а потом gtk_widget_show()
}

gtk_signal_connect (GTK_OBJECT (exif_window), "delete_event", GTK_SIGNAL_FUNC (WindowClose), NULL);
 
static gboolean WindowClose (GtkWidget *widget, GdkEvent *event, gpointer data) {
/* Return FALSE if you want to close the window by the cross */
    return TRUE;
}