#include void on_file1_activate (GtkMenuItem *menuitem, gpointer user_data); void on_open1_activate (GtkMenuItem *menuitem, gpointer user_data); void on_close1_activate (GtkMenuItem *menuitem, gpointer user_data); void on_media1_activate (GtkMenuItem *menuitem, gpointer user_data); void on_play2_activate (GtkMenuItem *menuitem, gpointer user_data); void on_pause1_activate (GtkMenuItem *menuitem, gpointer user_data); void on_stop1_activate (GtkMenuItem *menuitem, gpointer user_data); void on_about1_activate (GtkMenuItem *menuitem, gpointer user_data); void on_hscale1_value_changed (GtkAdjustment *adj, gpointer user_data); void on_drawingarea1_configure_event (GtkWidget *widget, GdkEventConfigure *event, gpointer user_data);