gtk_widget_size

["duanweiguang" <weiguang_duan foxitsoftware com>]

I want to get the size of widget but it prints the Gtk-WARNING blow :

(dd:15791): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -1211745941 and height 156571040

                     please tell me how i can get the size of widget.                  

                                     thank your!