2011/3/27 François Mauger <mauger@lpccaen.in2p3.fr>

Hi Olivier,

Your code looks ok.
On my system (Linux Ubuntu 9.10,gcc 4.4.1, Boost 1.44) I can check
that the following files 'parameters.hpp' and 'p1.cpp' compile, link and execute properly:
{{{
#ifndef PARAMETERS_HPP
#define PARAMETERS_HPP

//no need to include archives here:
#include <boost/serialization/nvp.hpp>

class rss_feeds_to_parse
{
public:

bool all;
template<class Archive> void serialize(Archive & ar, const unsigned int file_version)
{
ar & BOOST_SERIALIZATION_NVP(all);
}
};

class parameters
{
public:
rss_feeds_to_parse feeds; template<class Archive> void serialize(Archive & ar, const unsigned int file_version)
{
ar & BOOST_SERIALIZATION_NVP(feeds);
}
};

#endif // PARAMETERS_HPP
}}}
and
{{{
#include <fstream>
#include <assert.h>
#include <boost/archive/xml_oarchive.hpp> // archive is included here
#include <boost/serialization/nvp.hpp>

#include "parameters.hpp"

int main (void)

{
parameters p;
p.feeds.all = true;
std::ofstream ofs ("test_parameters.xml");
assert (ofs.good ());
boost::archive::xml_oarchive oa (ofs);
oa << BOOST_SERIALIZATION_NVP (p);
return 0;
}
}}}

the output is:
{{{
shell> cat test_parameters.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE boost_serialization>
<boost_serialization signature="serialization::archive" version="7">
<p class_id="0" tracking_level="0" version="0">
<feeds class_id="1" tracking_level="0" version="0">
<all>1</all>
</feeds>
</p>
</boost_serialization>
}}}
which is correct.

I suspect you have some other bits in your main that blanks the test_parameters.xml file...

Yes, probably. I tried my code removing all the other code in the main, and it works. What can cause this?

Regards,

Olivier

regards
frc
--

>>> Olivier Tournaire a écrit :

Hi all,

I am trying to introduce XML serialization in my project, but even with the simplest test, I cannot get something to work. Here is what I did:

#define PARAMETERS_HPP
#include <boost/archive/xml_iarchive.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <iostream>
class rss_feeds_to_parse
{
public:
bool all;
template<class Archive> void serialize(Archive & ar, const unsigned int file_version)
{
ar & BOOST_SERIALIZATION_NVP(all);
}
};
class parameters
{
public:
rss_feeds_to_parse feeds;
template<class Archive> void serialize(Archive & ar, const unsigned int file_version)
{
ar & BOOST_SERIALIZATION_NVP(feeds);
}
};
#endif // PARAMETERS_HPP

Later, in my main, I have:

parameters p;
p.feeds.all = true;
std::ofstream ofs("test_parameters.xml");
assert(ofs.good());
boost::archive::xml_oarchive oa(ofs);
oa << BOOST_SERIALIZATION_NVP(p);

It compiles, links and executes well, the file test_parameters.xml is created ... but empty !

What am I doing wrong?

Hope you could help.

Best regards,

Olivier
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--
François Mauger Groupe "Interactions Fondamentales et Nature du Neutrino"
NEMO-3/SuperNEMO Collaboration
LPC Caen-CNRS/IN2P3-UCBN-ENSICAEN
Département de Physique -- Université de Caen Basse-Normandie
Adresse/address:
Laboratoire de Physique Corpusculaire de Caen (UMR 6534)
ENSICAEN 6, Boulevard du Marechal Juin
14050 CAEN Cedex
FRANCE
Courriel/e-mail: mauger@lpccaen.in2p3.fr Tél./phone: 02 31 45 25 12 / (+33) 2 31 45 25 12
Fax: 02 31 45 25 49 / (+33) 2 31 45 25 49

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