Hello
And I am sorry for bothering again
The last couple of weeks I am trying to implement saving projects future in my program with boost serialization.
However it seems that it is more hard that I think :)
Now I am getting unregistered_class exception all over the place
First some info about what I am trying to do :
I am developing a plugin dll , which is loaded in third party main program.
My plugin , say MyPlugin.dll , contains serialization code ( non intrusive save/load pair ) for classes which are defined in third party dll , say A.dll. A.dll is suppiled with my third party main program. Both A.dll and MyPlugin.dll are laoded at runtime in my main program.
Only MyPlugin.dll ( and not A.dll and main program ) links with boost 1.41.0 staticly, if this is relevant at all. And I am using Visual Studio 2005.
I think that I am getting this unregistered_class exception because somehow I am getting weird behavior from typeid operator ( maybe some bug), for particular class form A.dll.
Note that the class have virtual methods. That is if I say :
std::string s1=typeid(ON_Brep).raw_name();
ON_Brep someBrepObj;
std:string s2=typeid(someTypeObj).raw_name();
s1 and s2 are not the same string.
I am doing the following :
/////////////////////MyPlugin.cpp
//all archive classes are included here
namespace boost
{
namespace serialization
{
template<class Archive>
inline void save(Archive & ar,const ON_Brep& t,const unsigned int version)
{
boost::serialization::void_cast_register<ON_Brep, ON_Geometry>(
static_cast<ON_Brep*>(NULL),
static_cast<ON_Geometry *>(NULL));
//save ON_Brep here
}
template<class Archive>
inline void load(Archive & ar,ON_Brep& t,const unsigned int version)
{
boost::serialization::void_cast_register<ON_Brep, ON_Geometry>(
static_cast<ON_Brep*>(NULL),
static_cast<ON_Geometry *>(NULL));
//load ON_Brep here
}
}
}
BOOST_SERIALIZATION_SPLIT_FREE(ON_Brep)
BOOST_CLASS_EXPORT_GUID(ON_Brep, "ON_Brep")
void CommandFunction()
{
ON_Brep* brep=GetBrepObject();
boost::archive::xml_oarchive oa(ofs);
oa & BOOST_SERIALIZATION_NVP(brep); // fails to save with uregistered_class exception
}
The unregistered_exception is thrown before control gets to my nonintrusive save function for my ON_Brep
Actually the exception is thrown in oserializer.hpp in line 376 :
const boost::serialization::extended_type_info * true_type =
i.get_derived_extended_type_info(t);
// here throws
if(NULL == true_type){
boost::serialization::throw_exception(
archive_exception(
archive_exception::unregistered_class,
true_type->get_debug_info()
)
);
}
get_derived_extended_type_info is trying to get the eti record for ON_Brep, but I think that that it gets it wrong, because of the weird typeid behavior.
get_derived_extended_type_info(const T & t) const {
// note: this implementation - based on usage of typeid (rtti)
// only does something if the class has at least one virtual function.
BOOST_STATIC_WARNING(boost::is_polymorphic<T>::value);
return
typeid_system::extended_type_info_typeid_0::get_extended_type_info(
typeid(t) ); /////// Here the typeid(t) differs from typeid(ON_Brep) <------------------1
}
The thing is when I export ON_Brep with BOOST_CLASS_EXPORT_GUID(ON_Brep,"ON_Brep") extended_type_info entry is inserted in the global map, just typeid(ON_Brep) is inserted in the global map
But when control gets to <-----1 the typeid(t) is different than the typeid that is entered in the global map,and just looking in the global map fails, becuase I have different behavior when I apply
typeid(ON_Brep).raw_name();//this gives me ".?AVON_Brep@@"
ON_Brep someBrepObj;
typeid(someBrepObj).raw_name();// this gives me ".?.?AVTL_Brep@@"
Anyone have seen such a thing ?
Thanks for any help