I think I'm missing something fundamental here. My understanding is that I can pass one pointer to a callback and that's it. And that works.
When I look at the example provided for "How do I validate/limit/filter the input to a GtkEntry?" in the Gtk+ FAQ (version 2.18.9 in my case) I see that the callback header looks like this: void insert_text_handler (GtkEntry *entry, const gchar *text, gint length, gint *position, gpointer data) The g_signal connect line looks like this: g_signal_connect(G_OBJECT(entry), "insert_text", G_CALLBACK (insert_text_handler), NULL); So we're passing NULL data to the callback function, but somehow that function is receiving const gchar *text, gint length, gint *position, gpointer data. This obviously doesn't square with the idea that you can pass one single pointer to a callback. What have I missed? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com www.creekfm.com - FIFTY THOUSAND WATTS of POW WOW POWER! _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list