From: Masao Mutoh <mutoh@...>
Date: 2007-02-13T21:59:07+09:00
Subject: Re: GtkDialog with GdkWindow as parent

Hi,

On Tue, 13 Feb 2007 06:15:09 +0900
"Christian Madsen" <doktormadsen@gmail.com> wrote:

> I am trying to create a Gtk::MessageDialog with a win32 window as its
> parent (the reason comes in the end). Now, it is possible to make a
> Gdk::Window wrapper using
>   require 'gtk2'
> 
>   win = Gdk::Window.foreign_new ARGV[0].to_i
> 
> But I cannot create a Gtk::MessageDialog with the Gdk::Window as
> parent
> 
>   Gtk::MessageDialog.new(win,
>                          Gtk::MessageDialog::MODAL,
>                          Gtk::MessageDialog::INFO,
>                          Gtk::MessageDialog::BUTTONS_OK,
>                          "foreign_test")
> 
> gives me the warning
> 
>   GLib-GObject-WARNING **:invalid cast from `GdkWindow' to `GtkWindow'
> 
> which is fair enough and the failed assertion

The error message means "Use Gtk::Window instead of Gdk::Window".
You need to use Gtk::Window as the parent.