[glade--]Problems with glade_get_widget_tree() during runtime

Hi all,

Let me start by thanking this group for helping me
(through online posts, though indirectly) with the
problems I've had so far with Glade.  Thank you all
much :)

Following is what I am facing now:

I have made a simple GUI with Glade.  The code being
produced is in C++.  The GUI contains a button and a
textview.  Upon pressing the button, I am trying to
display the text "Button pressed" in the textview. 
The signal handler code looks as follows:

---------------------
void window::on_button_clicked()
{                                                     
                      
   gchar output[50] = "Button clicked\n";
   GladeXML *xml;
   GtkTextView *textview;
                                                      
                         
   xml = glade_get_widget_tree(GTK_WIDGET(button));
   textview =  (GtkTextView*)glade_xml_get_widget(xml,
"textview");
                                                      
                         
   GtkTextBuffer* buf = 
gtk_text_view_get_buffer(textview);
   gtk_text_buffer_insert_at_cursor(buf, output,
strlen(output));
}
-----------------------

The code compiles fine, but when I run it it gives me
the following errors  in the console , upon pressing
the button:

-----------------------
(AA:19940): GLib-GObject-WARNING **: invalid cast from
`(null)' to `GtkWidget'
                                                      
                         
(AA:19940): Gtk-WARNING **: invalid cast from
`(unknown)' to `(unknown)'
                                                      
                         
(AA:19940): Gtk-CRITICAL **: file gtkobject.c: line
661 (gtk_object_get_data_by_id): assertion
`GTK_IS_OBJECT (object)' failed
                                                      
                         
** (AA:19940): CRITICAL **: file glade-xml.c: line 544
(glade_xml_get_widget): assertion `self != NULL'
failed.
                                                      
                         
(AA:19940): Gtk-CRITICAL **: file gtktextview.c: line
1210 (gtk_text_view_get_buffer): assertion
`GTK_IS_TEXT_VIEW (text_view)' failed
                                                      
                         
(AA:19940): Gtk-CRITICAL **: file gtktextbuffer.c:
line 598 (gtk_text_buffer_insert_at_cursor): assertion
`GTK_IS_TEXT_BUFFER (buffer)' failed
---------------------

I then commented out all but the first line:

----------------------
void window::on_button_clicked()
{                                                     
                      
   gchar output[50] = "Button clicked\n";
   GladeXML *xml;
   GtkTextView *textview;
                                                      
                         
   xml = glade_get_widget_tree(GTK_WIDGET(button));
//   textview = 
(GtkTextView*)glade_xml_get_widget(xml, "textview");
                                                      
                         
//   GtkTextBuffer* buf = 
gtk_text_view_get_buffer(textview);
//   gtk_text_buffer_insert_at_cursor(buf, output,
strlen(output));
}
-------------------

I compiled and ran the code, and got the errors:

--------------------- 
(AA:20793): GLib-GObject-WARNING **: invalid cast from
`(null)' to `GtkWidget'
 
(AA:20793): Gtk-WARNING **: invalid cast from
`(unknown)' to `(unknown)'
 
(AA:20793): Gtk-CRITICAL **: file gtkobject.c: line
661 (gtk_object_get_data_by_id): assertion
`GTK_IS_OBJECT (object)' failed
-----------------------

So as one can see the problem is the conversion of
'button' to a widget.  

I have made the window, the button, and the textview
public.  

Has anyone experienced such a problem before?

Any help would be appreciated.

Again, the code is in C++.

Thanks in advance,
Mukund Gopalan


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