Re: [Boost-users] [serialization] empty xml output

27 Mar 2011

      Hi,

2011/3/27 François Mauger 
...
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 
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 
#include  // archive is included here
#include 
#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>

<p class_id="0" tracking_level="0" version="0">
  <feeds class_id="1" tracking_level="0" version="0">
      <all>1</all>
  </feeds>
</p>

}}}
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 
#include 
#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
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