Gtk+2.0 define signal callback function,but it doesn't be called

["robbie" <sandy_21 sina com>]

code:

      char *signals[] = {
      "button_press_event",
      "button_release_event",
      "motion_notify_event",
      "key_press_event"         

   };

 

for (i = 0; i < sizeof (signals) / sizeof (signals[0]); i++) {

   gtk_signal_connect_object
         (GTK_OBJECT (GTK_SCROLLED_WINDOW(scrolled)->vscrollbar),
          signals[i],  GTK_SIGNAL_FUNC (Dw_gtk_scrolled_window_changed1),
          GTK_OBJECT (scrolled));
      gtk_signal_connect_object_after
         (GTK_OBJECT (GTK_SCROLLED_WINDOW(scrolled)->vscrollbar),
          signals[i],  GTK_SIGNAL_FUNC (Dw_gtk_scrolled_window_changed2),
          GTK_OBJECT (scrolled));

 }

 

i use gdb,set breakpoint a function Dw_gtk_scrolled_window_changed1,Dw_gtk_scrolled_window_changed2,

when i click the mouse on the gtk widget area,it only breaks at Dw_gtk_scrolled_window_changed1,but

never break at Dw_gtk_scrolled_window_changed2,i'm confused.

 

any wrong gtk_signal_connect_object_after()?  all code above is from dillo 0.6.4,it's wrote in gtk1.2,

now i want to port it to gtk 2.0.

 

Anyone can help,thanks