Re: [Boost-users] [Boost.Serialization] St8bad_cast during serialization

From: Robert Ramey (ramey_at_[hidden])
Date: 2007-01-07 00:08:36

A couple of observations:

a) you might try using xml_?archives for debugging.  The consume more space 
are
are easier to interpret.

b) Could it be that you are doing something like:

ar << lm ;  // pointer to LogMessage
...
ar >> m; // pointer to Message

If so - this would be a problem.  If you want to load(de-serialize) through
a base class pointer, you have to save(serialize) also through a base class
pointer.

If this doesn't help, make a small test which just serializes and 
de-serializes
and we can take a look at it.

Robert Ramey

sadrok wrote:

> My application saves message classes derived from a Message base class
> (it has a virtual deconstructor) and sends this serialized data over a
> UNIX socket for IPC between interconnected processes.
> The sending side seems to work fine as can be seen from the debugging
> output below:
>
> In base/module.cpp line 111 function SendMessage :
> [
> 22 serialization::archive 3 4 core 10 LogMessage -1209954316 1 18
> Sadrok::LogMessage 1 0
> 0 0 1168098092 55 Loaded module log from file modules/liblog.so pid
> 14250 ]
>
> However on the receiving side I have this:
> ia & BOOST_SERIALIZATION_NVP(msginfo.msg);
> which ends up throwing an bad_cast exception
> Unhandled exception: St8bad_cast
>
> msginfo.msg is Message*
> I even tried loading into a LogMessage * with the same error.
>
> I have (in the logmessage header) BOOST_CLASS_EXPORT for the
> LogMessage (otherwise Boost would've thrown unregistered_class while
> saving).