Re: [Boost-users] problem with float or double serialization withbinary archive VC 7.1 boost1.32 and 1.33

From: Robert Ramey (ramey_at_[hidden])
Date: 2005-08-02 23:25:00

I believe that code like the following:

 std::ofstream ofs("val.bin");
 boost::archive::binary_oarchive oa(ofs,std::ios::binary);
 oa<< f ;

should be changed to:

 std::ofstream ofs("val.bin", std::ios::binary);
 boost::archive::binary_oarchive oa(ofs);
 oa<< f ;

Robert Ramey
  "Stephane Martineau" <stephane.martineau_at_[hidden]> wrote in message news:002b01c5973f$ec8fad60$234c8189_at_ICDI6...
  Hye,

  this little program fail in serialization of a float with binary archive but success with xml or text archive ??

  as i am not an expert, i have now idea why ???
   i have the save problem with double and like with float, only depending of the value ....

  it fails under windows XP, VC++7.1 but success under Linux + gcc 

  thanks for helping ,
  Stéphane.

  // problemeserialisation.cpp 
  //

  #include <iostream>
  #include <fstream>
  #include <boost/archive/text_oarchive.hpp>
  #include <boost/archive/text_iarchive.hpp>
  #include <boost/archive/binary_oarchive.hpp>
  #include <boost/archive/binary_iarchive.hpp>
  #include <boost/archive/xml_oarchive.hpp>
  #include <boost/archive/xml_iarchive.hpp>

  void test_binary (float & f)
  {
   using namespace std ;
   std::ofstream ofs("val.bin");
   boost::archive::binary_oarchive oa(ofs,std::ios::binary);
   oa<< f ;
   ofs.close();
   std::cout << "Valeur serialisee binary " << f << std::endl ;
   std::ifstream ifs("val.bin");
   boost::archive::binary_iarchive ia(ifs,std::ios::binary);
   float f1;
   ia >> f1;
   
  if (ifs.fail()) 
   {
    cout << "badbit  "  << ( ifs.rdstate( ) & ios::badbit ) << endl;
    cout << "failbit " << ( ifs.rdstate( ) & ios::failbit ) << endl;
    cout << "eofbit  "  << ( ifs.rdstate( ) & ios::eofbit ) << endl;
   }

   std::cout << "Valeur deserialisee binary "<< f1 << std::endl ;
      ifs.close();
   return ;
  }

  void test_text (float & f)
  {
   std::ofstream ofs("val.txt");
      boost::archive::text_oarchive oa(ofs);
   oa <<  f ;
   ofs.close();
   std::cout << "Valeur serialisee Texte " << f << std::endl ;
   std::ifstream ifs("val.txt");
   boost::archive::text_iarchive ia(ifs);
   float f2 ;
   ia >> f2; 
   std::cout << "Valeur deserialisee Texte "<< f2 << std::endl ;
      ifs.close();
   return ;
  }

  void test_xml (float & f)
  {
   std::ofstream ofs("val.xml");
      boost::archive::xml_oarchive oa(ofs);
   oa <<  BOOST_SERIALIZATION_NVP(f) ;
   ofs.close();
   std::cout << "Valeur serialisee Xml " << f << std::endl ;
   std::ifstream ifs("val.xml");
   boost::archive::xml_iarchive ia(ifs);
   float f2 ;
   ia >> BOOST_SERIALIZATION_NVP(f2); 
   std::cout << "Valeur deserialisee Xml "<< f2 << std::endl ;
      ifs.close();
   return ;
  }

  int main (int argc, const char * argv[])
  {
   float f1 = (float)2.411667 ;
   test_text(f1);
   test_xml(f1);
   test_binary(f1);
   return 0;
  }

  output  :

  Valeur serialisee Texte 2.41167
  Valeur deserialisee Texte 2.41167
  Valeur serialisee Xml 2.41167
  Valeur deserialisee Xml 2.41167
  Valeur serialisee binary 2.41167
  badbit  0
  failbit 2
  eofbit  1
  Valeur deserialisee binary -1.07137e+008

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