Re: [Boost-users] Serialization XML on windows and linux

8 Jul 2010

      -----Message d'origine-----
De : Robert Ramey

QUILLET Jean-Charles wrote:
...
...
Hi,
I've been using the boost serialization for quite a few projects and
it works realy well in many different situations. But today I'm
facing a problem, I find very difficult to solve. I serialize objects
in a XML archive for a project working on linux and windows using
boost 1.38. And oddly my files are not compatible between the two
plateforms. When I try to deserialize an object saved on a different
plateform, the application crashes despite the fact that I catch
possible exceptions. When I compare the two files, it seems that I
have a difference of class_id
Here is a sample of what I have on linux:

                <pNode class_id="6" class_name="Group"
tracking_level="1" version="0" object_id="_1">
                                <Node class_id="5" tracking_level="1"
version="0" object_id="_2"></Node>
                                <noeuds class_id="7"
tracking_level="0" version="0">
                                               <count>0</count>
0
                               </noeuds>
                </pNode>
.

And the same object on windows:

                <pNode class_id="6" class_name="Group"
tracking_level="1" version="0" object_id="_1">
                               <Node class_id="7" tracking_level="1"
version="0" object_id="_2"></Node>
                               <noeuds class_id="8"
tracking_level="0" version="0">
                                               <count>0</count>
0
                               </noeuds>
                </pNode>
.

In my file on windows, I don't have any object of a class_id="5",
weird.
Does any one know any reason for this behaviour ?
Any idea greatly appreciated.
...
This is a new one.  They should be absolutely compatible.  Let us know when 
you find the source of this.
...
Robert Ramey
After a few investigations, it seems that my problem is related to the fact that I'm serializing polymorphic objects through a plugin system. I think the linux version should be the good one as no class_id is missing. It seems that there is something that might solve my problem in boost 1.4* reading this:

http://www.boost.org/doc/libs/1_43_0/libs/serialization/doc/special.html#dll...

I understand that I might have redundant serialization code in my application and in the shared librairies: one version might be called on windows and another one from linux (pure speculation) producing two versions of a serialized object.

Does anyone have any experience with this ? Do I have a way out using boost 1.38 or should I upgrade to a newer version to take advantage of the BOOST_EXPORT_CLASS_IMPLEMENT macro ?

Any idea most welcome,

Jean-Charles