gui in fonction

[Axel <axel azerty netcourrier com>]

hi
I have a problem with fonction.
basically, i d like to use fonction to build my gui, so here is the function I d like to use

void create_window(GtkWidget *window)
	{
	window=gtk_window_new (GTK_WINDOW_TOPLEVEL);
	gtk_widget_set_size_request(GTK_WIDGET(window),500,250);
	}

I call it in main() as following :

GtkWidget *window;
create_window(window);
gtk_widget_show(window);


the problem is that my program segfault.
No problem when I use gtk_window_new et set_size in the main().

So is it possible to build a gui in an external function ?  Where is my error ?

Thanks in advance