From: Kevin Smith <sent@...>
Date: 2001-01-20T15:37:31+09:00
Subject: [ruby-talk:9583] GTK problems under Windows

I'm porting my game from Ruby/GTK/Linux to 
Windows. So far, I've discovered:
- CList#set_column_auto_resize behaves quite 
differently under Win
- Pixmap#get_geometry doesn't seem to work under 
Win

I've solved both of those. Now for the hard one: 
Combo boxes. This code works great under Linux, 
but fails under Win:
	require 'gtk'
	mw = Gtk::Window.new(Gtk::WINDOW_TOPLEVEL)
	mw.signal_connect("delete_event") do p 
$c.entry.get_text; exit end
	mw.signal_connect("destroy_event") do p 
$c.entry.get_text; exit end
	$c = Gtk::Combo.new
	$c.set_popdown_strings(["a"])
	mw.add($c)
	mw.show_all
	p $c.entry.get_text
	Gtk.main

The trouble is at p $c.entry.get_text which 
generates:

Gtk-WARNING **: invalid cast from (NULL) pointer 
to `GtkObject'
Gtk-CRITICAL **: file gtkobject.c: line 1132 
(gtk_object_set_user_data): assertion `object != 
NULL' failed.
Gtk-CRITICAL **: file gtksignal.c: line 724 
(gtk_signal_connect): assertion `object != NULL' 
failed.

I'm using: Ruby 1.6.1 on Linux, 1.6.2 on Win, 
Ruby/GTK .23 on both systems, and GTK 1.3 on 
Win.

Help?

Kevin