16.1.2 信号连接回调函数
#define gtk_signal_connect(object, name, func,
func_data) \
gtk_signal_connect_full((object), (name), (func), 0,
(func_data), 0, 0, 0)
gulonggtk_signal_connect_full(GtkObject*object,
const gchar *name, GtkSignalFuncfunc, \
GtkCallbackMarshalunsupported, gpointer data,
GtkDestroyNotifydestroy_func, \
gint object_signal, gint after);
void callback_func(GtkWidget*widget, gpointer
callback_data);
