On Mon, Jul 25, 2005 at 09:18:57AM -0700, Colossus wrote: > g_signal_connect ((gpointer) AddFile_button, "clicked", > G_CALLBACK (on_add_files_activate), > "dummy"); > > I have noticed that if the function "on_add_files_activate" is > declared with only one parameter, gpointer data , I never receive the > word dummy. Instead if the same function is declared with two parameters: > > void on_add_files_activate ( GtkWidget *useless , gpointer data); > I can successfull print the value "dummy" pointed by data. > > Could gtk developers explain this strange behaviour please ?
There's nothing strange about this behaviour. The first argument of signal handlers is alwasy the object that emitted the signal, user_data is the last. If you want user_data as the first argument, use g_signal_connect_swapped(). Please read the Gtk+ tutorial. The fact C functions may be called with more arguments than declared (though it's still error in ANSI C if you do that without typecast) is just a side-effect of C calling convention. Yeti -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
