Re: [boost] [serialization] "stream error" when port fromboost_1.33 toboost_1.36

26 Sep 2008

      Thank you for reminding, the before xml file auto adding cr/lf while
transfering  from linux in text mode.
I used the origin xml file to debug in it, and found the prolbem.

in file <basic_xml_iarchive.ipp>
boost_1.33 implimentation is :

template<class Archive>
BOOST_ARCHIVE_OR_WARCHIVE_DECL(void)
basic_xml_iarchive<Archive>::load_end(const char *name){
    .....

    if(0 != (this->get_flags() & no_xml_tag_checking)){
        // double check that the tag matches what is expected - useful for debug
        if(0 != name[this->This()->gimpl->rv.object_name.size()]
        || ! std::equal(
                this->This()->gimpl->rv.object_name.begin(),
                this->This()->gimpl->rv.object_name.end(),
                name
            )
        ){
            boost::throw_exception(
                archive_exception(archive_exception::stream_error)
            );
        }
    }
}

But in Boost 1.36

template<class Archive>
BOOST_ARCHIVE_OR_WARCHIVE_DECL(void)
basic_xml_iarchive<Archive>::load_end(const char *name){
    .....

    if(0 == (this->get_flags() & no_xml_tag_checking)){
        // double check that the tag matches what is expected - useful for debug
        if(0 != name[this->This()->gimpl->rv.object_name.size()]
        || ! std::equal(
                this->This()->gimpl->rv.object_name.begin(),
                this->This()->gimpl->rv.object_name.end(),
                name
            )
        ){
            boost::throw_exception(
                archive_exception(archive_exception::stream_error)
            );
        }
    }
}

And in my case, this->get_flags() is 0, no_xml_tag_checking is 4,
so (this->get_flags() & no_xml_tag_checking) is false in boost 1.33
and true in boost 1.36,
then the "name" is "t.id", but rv.object_name is "id",
so "0 != name[this->This()->gimpl->rv.object_name.size()" is true,
boost 1.33 no archive_exception but 1.36 throws.

This is the problem. Why boost 1.36 do the check? and why the "name"
and rv.object_name dont match?
And how do id fix it?  Modify the boost_1.36 basic_xml_iarchive.ipp
same to boost_1.33?

Here is a xml example text(attach file):
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE boost_serialization>
<boost_serialization signature="serialization::archive" version="3">
<lst_ class_id="0" tracking_level="0" version="0">
        <count>2</count>
        <item class_id="1" tracking_level="0" version="0">
                <id>2</id>
                <host>192.168.21.41</host>
                <port>7100</port>
        </item>
        <item>
                <id>4</id>
                <host>192.168.21.52</host>
                <port>7100</port>
        </item>
</lst_>
</boost_serialization>

2008/9/26 Robert Ramey <ramey@rrsd.com>:
...
One odd thing to me is the usage of std::ios::binary which will handle cr/lf
as two
characters rather than one.
ipangth wrote:
...
...
What are the anomolies?
I debug the xml file with VC8, and  the ifstream test retturn
"failbit".
See the xml file attached behind, i dont know how to find the
"failbit".
And some one can see the attach xml to help me?
template<class CharType>
bool basic_xml_grammar<CharType>::my_parse(
   BOOST_DEDUCED_TYPENAME basic_xml_grammar<CharType>::IStream & is,
   const rule_t & rule_,
   CharType delimiter
){
   if(is.fail()){ ////here return false, the stream state is
       "failbit" boost::throw_exception(
           archive_exception(archive_exception::stream_error)
       );
   }
2008/9/26 Robert Ramey <ramey@rrsd.com>:
...
Take a look at the xml archive and see if there are any anomolies
in it.
Robert Ramey
ipangth wrote:
...
...
I just port a project using boost_1.33_1 to use boost_1.36.
The project has a Server class using a std::set<Server>
serialization,
the serialization save and load functions code see behind.
I use gcc 4.1 and run on FC6.
The porting problem is, when the old boost_1.33 generates(save) a
xml file, then use  boost_1.36 load the xml throws an exception
"stream error"!
the exception error code line : boost::archive::xml_iarchive
ia(ifs);
How can i sovle it?
class Server
{
public:
  int id;
  std::string ip;
  int port;
private:
  static std::set<Server> lst_;
static int dirty_;
};
#endif
#ifdef USE_SERVER_SERIALIZATION
#ifndef _SERVER_SERIALIZATION_
#define _SERVER_SERIALIZATION_
BOOST_CLASS_VERSION(Server, 1)
namespace boost {
  namespace serialization {
template <class archive>
      void serialize(archive & ar, Server & t, const unsigned int
      ver) {
          ar & BOOST_SERIALIZATION_NVP(t.id);
          ar & BOOST_SERIALIZATION_NVP(t.ip);
          ar & BOOST_SERIALIZATION_NVP(t.port);
      }
}
}
#endif
#endif
int Server::save(    const std::string & file)
{
  try {
      std::ofstream ofs(file.c_str(), std::ios::binary);
      {
      boost::archive::xml_oarchive oa(ofs);
      oa << BOOST_SERIALIZATION_NVP(lst_);
      }
  } catch(...) {
      return ERROR_ERROR;
  }
return ERROR_SUCCEED;
}
int  Server::load(const std::string & file)
{
      std::set<Server> Server::lst_;
      try
      {
        std::ifstream ifs(file.c_str(), std::ios::binary);
{
          boost::archive::xml_iarchive ia(ifs);
          ia >> BOOST_SERIALIZATION_NVP(lst_);
        }
      }
      catch(std::exception & e)
      {
                      std::cout  << e.what() << std::endl;
      }
return 0;
}
--
Best regards,
PangYongQiang
...
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Best regards,
PangYongQiang
...
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Best regards,
PangYongQiang