Determining widget type

Phil Wolff via gtkmm-list <[email protected]> Fri, 27 Mar 2020 08:54:32 -0700

Newsgroups	gmane.comp.gnome.gtkmm
Message-ID	<[email protected]>

I want to modify the primary message widget so I can select and copy the 
text.

     Gtk::Box* pBox = pDialog->get_content_area ();
     std::vector<Gtk::Widget* > v = pBox->get_children ();
     Glib::ustring str = ((Gtk::Label*)v[0])->get_label ();

This fails: Gtk-CRITICAL: 08:51:12.080: gtk_label_get_label: assertion 
'GTK_IS_LABEL (label)' failed

So the primary message widget isn't a Gtk::Label. How do I determine 
what it is?

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