Re: [boost] serialization in multiple dlls

Subject: Re: [boost] serialization in multiple dlls
From: pipalapop (pipalapop_at_[hidden])
Date: 2010-12-10 04:23:56

Thanks for your answer.

Do you think that there is a problem in the API to support this form of implementation?
If not, have you an idea to allow it?

Regards, Yohan

--- En date de : Mer 8.12.10, Robert Ramey <ramey_at_[hidden]> a écrit :

> De: Robert Ramey <ramey_at_[hidden]>
> Objet: Re: [boost] serialization in multiple dlls
> À: boost_at_[hidden]
> Date: Mercredi 8 décembre 2010, 19h04
> pipalapop wrote:
> > Hi,
> > I have a problem with the deserialization of objects
> defined in
> > multiple dlls.
> > I define the following classes in a first dll:
> polymorphic_base (pure
> > virtual) and polymorphic_derived1 (derived from
> polymorphic_base).
> > In a second dll, I define the class
> polymorphic_derived2 (derived
> > from polymorphic_derived1).
> > In an executable, I serialize an object of type
> polymorphic_derived2
> > followed and two objects of type polymorphic_derived1
> in the order
> > defined in this function:
> >
> > void save_exported (const char *testfile)
> > {
> > std::ofstream os(testfile);
> > xml_oarchive oa(os);
> >
> > polymorphic_base * pb_ptr_1 = new
> polymorphic_derived1;
> > oa << BOOST_SERIALIZATION_NVP(pb_ptr_1);
> >
> > polymorphic_base * pb_ptr_2 = new
> polymorphic_derived2;
> > oa << BOOST_SERIALIZATION_NVP(pb_ptr_2);
> >
> > polymorphic_base * pb_ptr_3 = new
> polymorphic_derived1;
> > oa << BOOST_SERIALIZATION_NVP(pb_ptr_3);
> >
> > }
> >
> > The serialization works, but when, I try to
> deserialyze with this
> > function:
> >
> > void load_exported(const char *testfile)
> > {
> > std::ifstream is(testfile);
> > xml_iarchive ia(is);
> >
> > polymorphic_base * pb_ptr_1 = NULL;
> > ia >> BOOST_SERIALIZATION_NVP(pb_ptr_1);
> >
> > polymorphic_base * pb_ptr_2 = NULL;
> > ia >> BOOST_SERIALIZATION_NVP(pb_ptr_2);
> >
> > polymorphic_base * pb_ptr_3 = NULL;
> > ia >> BOOST_SERIALIZATION_NVP(pb_ptr_3); 
> // <= exception
> >
> > }
> >
> > an exception is thrown on the deserialization of the
> second object of
> > type polymorphic_derived1 but it works for the first
> one.
> >
> > in the file basic_archive.cpp, line 466 : 
> "pending_bis = &
> > bpis_ptr->get_basic_serializer();"
> > bpis_ptr is null.
> >
> > It seems that the deserialization of the object of
> type
> > polymorphic_derived2 (derived from
> polymorphic_derived1) has broken
> > the part of table cobject_id_vector concerning
> polymorphic_derived1.
> >
> > If polymorphic_derived2 is defined in the first dll,
> there is no
> > problem.
> >
> > Is it possible to make it works with 2 dll?
> 
> probably, but would required some investigation.
> 
> Robert Ramey
> 
> >
> > Regards, Yohan
> >
> >
> >
> > _______________________________________________
> > Unsubscribe & other changes:
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> 
> 
> 
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