gtk+ 环境下，遇到assertion 'GTK_IS_NOTEBOOK (notebook)' failed，怎么破？

Gtk-CRITICAL **: IA__gtk_notebook_remove_page: assertion 'GTK_IS_NOTEBOOK (notebook)' failed

#include
2  #include

3 GtkWidget*entry;

4 void notebook_remove(GtkWidget*button,gpointer notebook)

5 {

6 gint page;

7 gchar buffer[20];

8 page=gtk_notebook_get_current_page(GTK_NOTEBOOK(notebook));

9 snprintf(buffer,20,"It is the %dth page",page);

10 gtk_entry_set_text(GTK_ENTRY(entry),buffer);

11 gtk_notebook_remove_page(GTK_NOTEBOOK(notebook),page);

12 }

13 int main(int argc,char**argv)

14 {

15 GtkWidget*window;

16 GtkWidget*tabel;

17 GtkWidget*notebook;

18 GtkWidget*button;

19 GtkWidget*label;

20 gchar bufferl[40];

21 gint i;

22 gtk_init(&argc,&argv);

23 window=gtk_dialog_new();

24 gtk_window_set_default_size(GTK_WINDOW(window),600,200);

25 notebook=gtk_notebook_new();

26 for(i=0;ivbox),notebook,FALSE,FALSE,0);

33 entry=gtk_entry_new();

34 gtk_box_pack_start(GTK_BOX(GTK_DIALOG(window)->vbox),entry,FALSE,FALSE,0);

35 gtk_entry_set_text(GTK_ENTRY(entry),"Nothing happens");

36 button=gtk_button_new_with_mnemonic("remove");

37 gtk_box_pack_start(GTK_BOX(GTK_DIALOG(window)->action_area),button,FALSE,FALSE,0);

38 g_signal_connect_swapped(GTK_OBJECT(button),"clicked",G_CALLBACK(notebook_remove),notebook);

39 button=gtk_button_new_with_label("close app");

40 gtk_box_pack_start(GTK_BOX(GTK_DIALOG(window)->action_area),button,FALSE,FALSE,0);

41 g_signal_connect(GTK_OBJECT(button),"clicked",G_CALLBACK(gtk_main_quit),NULL);

42 gtk_widget_show_all(window);

43 gtk_main();

44 return 0;

45 }

46