Re: Gtk::Action subclass with Visual C

[Yann LEYDIER <yann leydier info>]

Good news : the crash is not caused by stlport !

I recompiled all sigc, Glibmm, Cairomm, etc. and Gtkmm with regular MS 
STL and the sample code still crashes in ~Action().

When debugger displays the value of "this", it is 12 bytes farther than 
the adress of my object (on a 32bits OS). There seems to be a kind of shift.

Using a virtual inheritence seems to help with the destructor crash 
problem but makes it impossible to cast MyAction* safely to Action*.

Playing with Glib::Object_base's constructor's parameters does not help 
(at best is can move the crash to sigc::trackable::~trackable !).

What strikes me is that inheritence works perfectly with Widgets ! Did I 
miss something ? Are there some flags that I should set manually appart 
from GTKMM_DLL ?

Thanks,
yann

On 31/01/2011 11:52, Yann LEYDIER wrote:
> I tried to run the same test with Gtkmm's installer and Visual C++ 2008
> and it works. It also works with MinGW.
>
> So it seems that Gtkmm cannot be compiled with Stlport. Any idea why ?
>
>
> As Glib::ustring is based on std::string, I fear that if it is very
> risky to link the official Gtkmm DLL with an exe that uses Stlport...
> Did anyone try ?
>
> yann
>
> On 19/01/2011 16:35, Yann LEYDIER wrote:
> > Hi,
> >
> > I created two Action subclasses (one for ScaleButton and another for
> > ColorButton). It works fine on linux (Ubuntu 10.04 and Debian Sid).
> > However it crashes with Visual C++ 2008.
> >
> > My project uses stlport (to avoid DLL restrictions on the standard
> > library) so I compiled libsigc++, glibmm, cairomm, pangomm, atkmm and
> > gtkmm (2.22.0) with Stlport 5.2.1.
> >
> > I isolated the problem (or at least, one problem) in a small code sample
> > pasted at the end of the message. The program crashes (access violation)
> > at exit in Gtk::Action::~Action(), which is an empty method !
> >
> > Moreover, Visual C++'s debugger prints a wrong address for "this"
> > whereas a "cout << this" in my destructor prints the good address.
> >
> > Running the program with valgrind on linux displays no error.
> >
> > Does anyone know what can cause such a crash ? It is hard to find
> > documentation or examples on how to create custom actions, so I don't
> > know if I did something wrong.
> >
> > Many thanks,
> > Yann
> >
> >
> >
> > #include <gtkmm.h>
> >
> > class MyAction: public Gtk::Action
> > {
> > public:
> > static Glib::RefPtr<MyAction> create(const Glib::ustring &name)
> > {
> > return Glib::RefPtr<MyAction>(new MyAction(name));
> > }
> > private:
> > MyAction(const Glib::ustring &name):
> > Gtk::Action(name)
> > {
> > }
> > ~MyAction() {}
> > };
> >
> > int main(int argc, char* argv[])
> > {
> > Gtk::Main kit(argc, argv);
> > Gtk::Window w;
> > Glib::RefPtr<MyAction> act(MyAction::create("toto"));
> > kit.run(w);
> > return 0;
> > }
> >
> > _______________________________________________
> > gtkmm-list mailing list
> > gtkmm-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtkmm-list
>
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