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From: hreba <f_hreba@yahoo.com.br>
Newsgroups: comp.lang.ada
Subject: assertion 'GTK_IS_WIDGET (widget)' failed: how to debug?
Date: Sun, 8 Jan 2017 11:59:03 +0100
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Date: 2017-01-08T11:59:03+01:00
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Hi,

I have the following sequence in my program:

       obj:= last_builder.Get_Object(winname);
       if obj=null then raise findobject_Ex with
	builder_file & ": " & winname & " not found";
       end if;
       win.win := Gtk.Window.Gtk_Window (obj);
       win.win.Show_All;

When it is executed for the first time, it runs as expected. At the 
second time, the window win.win does not open and the following warning 
is printed out:

(sos:2905): Gtk-CRITICAL **: gtk_widget_show_all: assertion 
'GTK_IS_WIDGET (widget)' failed

For debugging I would like to execute the GTK macro G_OBJECT_TYPE_NAME 
but did not find anything similar in gtkada.

So how would you debug this?
-- 
Frank Hrebabetzky		+49 / 6355 / 989 5070