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

3 Aug 2005

      ok that's cool ;)

Now it works, thanks a lot .

  ----- Original Message ----- 
  From: Robert Ramey 
  To: boost-users@lists.boost.org 
  Sent: Wednesday, August 03, 2005 6:25 AM
  Subject: Re: [Boost-users] problem with float or double serializationwithbinary archive VC 7.1 boost1.32 and 1.33

  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"  wrote in message news:002b01c5973f$ec8fad60$234c8189@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 
    #include 
    #include 
    #include 
    #include 
    #include 

    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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