Re: Can't process Gtk::Builder::get_widget errors

[Armin Burgmeier <armin arbur net>]

Саша Иваненко wrote:
> Hi all
>
> I use Gtk::Builder to load UIs from glade-generated xml on win32(Visual Studio 9.0). 
> Problem is what if widget with a given name does not exist get_widget generates access violation system 
> exception, without any chance for me to catch it. All I can do is to check widget existence using gtk+ 
> native gtk_builder_get_object call before calling Builder::get_widget. As far as I understand the root of 
> the problem is what get_widget_checked internal call returns 0, and dynamic_cast from 0 throws AV instead 
> of casting to 0 ( or throwing bad_cast?). 

Are you sure that dynamic_cast crashes when casting from 0? This seems 
to work for me in this testcase:

#include <iostream>

class A { virtual ~A(); };
class B: public A {};

int main()
{
  std::cout << dynamic_cast<B*>((A*)NULL) << std::endl;
}

> Is it Win32 specific problem? Ho do the get_widget is intended to behave in case of non-existent widget 
> name? I would appreciate any suggestions.
>
> Thank you,
> Alexander Ivanenko.

Armin