Boost serialization/deserialization archive "stream error" exception

Question

I've the following problem..

I have a file called A.h and a file B.h. each contains some struct like this: (the structs inside the two classes are different)

struct Base
{
    friend class access;

    template <typename Archive>
    void serialize(Archive& ar,const unsigned int version)
    {
        ar & fieldLength;
        ar & fieldMD;
        ar & fieldTime_Stamp;
    }   
   public:
        unsigned int fieldLength;
        unsigned int fieldMD;
        unsigned int fieldTime_Stamp;

       virtual void f(){} //to be polymorphic the struct
};

struct Derived:public Base
{
    ...
}

So i serialize the struct in the classic manner:

....

std::ostringstream archive_stream;

boost::archive::text_oarchive archive(archive_stream);

archive.register_type(static_cast<Derived*>(NULL))

archive <<p;   // where p is a pointer to Base

NOW THE PROBLEM... on the deserialization side, I follow the same (inverse) procedure...if I deserialize singularly the structs in A.h (without include in the project B.h) and the structs in B.h (without include in the project A.h) all works....but If I include in the project both the classes, the deserialization works for one class, but throws the "Stream error exception" in the instruction " archive >> m;" for the other...it seems a conflict in the registration class or something like this... Any ideas?thanks...

std::istringstream archive_stream(mex); //mex is the serialized data received form the socket boost::archive::text_iarchive archive(archive_stream); archive.register_type(static_cast<Derived*>(NULL)); ... Base* m; archive >> m; — marco
– marco, Commented May 19, 2011 at 7:07
I've observed that I have a conflict on registration of the class through the archive.register_type(), despite I create two (local)text_iarchive in separate processes(I use the fork call)...in fact, if I comment the registration code of the second process, all works...how is it possible? — marco
– marco, Commented May 19, 2011 at 9:43
If you use fork, you have to do the registration either before the fork (once) or after the fork (twice, one in each process). — Diego Sevilla
– Diego Sevilla, Commented May 19, 2011 at 10:19

ashleysmithgpu · Accepted Answer · 2011-05-30 20:46:28Z

2

Have you serialised the base data in the derived class serialize function?

ar & boost::serialization::make_nvp( "base", boost::serialization::base_object< Base >( *this ) );

And I dont know if this would help, but I use

BOOST_CLASS_IMPLEMENTATION(x, boost::serialization::object_serializable);
BOOST_CLASS_TRACKING(x, boost::serialization::track_never)

to register the classes as serialiseable. Hope that helps :3

answered May 30, 2011 at 20:46

ashleysmithgpu

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