Hi all,

I am having following problem while reading the data out of the file using one of the sample program provided in boost serialization example online. I am trying to read the file having multiple gps_position objects but getting following exception. Can someone please let me know what might be the problem here. Let me know if you need any more information:

#include <fstream>

#include <string>

// include headers that implement a archive in simple text format

#include <boost/archive/text_oarchive.hpp>

#include <boost/archive/text_iarchive.hpp>

#include <boost/serialization/list.hpp>

#include <boost/serialization/vector.hpp>

#include <boost/serialization/base_object.hpp>

/////////////////////////////////////////////////////////////

// gps coordinate

//

// illustrates serialization for a simple type

//

class gps_position

{

private:

    friend class boost::serialization::access;

    // When the class Archive corresponds to an output archive, the

    // & operator is defined similar to <<.  Likewise, when the class Archive

    // is a type of input archive the & operator is defined similar to >>.

    template<class Archive>

    void serialize(Archive & ar, const unsigned int version)

    {

        ar & degrees;

        ar & minutes;

        ar & seconds;

        ar & day;

    }

public:

    int degrees;

    int minutes;

    float seconds;

    std::string day;

    gps_position(){};

    gps_position(int d, int m, float s, std::string inDay) :

        degrees(d), minutes(m), seconds(s), day(inDay)

    {}

};

int main() {

    // create and open a character archive for output

    std::ofstream ofs("filename");

    // create class instance

    const gps_position g(35, 59, 24.567f, "Monday_Pointer");

    const gps_position g1(45, 69, 34.567f, "Tuesday_Pointer");

    const gps_position * g2 = new gps_position(1,2,3.3, "WEDNESDAY_PTR");

    {

        boost::archive::text_oarchive oa(ofs);

        oa << g;

        oa << g1;

        oa << (*g2);

    }

    {

        /**gps_position g;

        std::vector<gps_position> vec;

        std::ifstream ifs("filename");

        boost::archive::text_iarchive ia(ifs);

        while (!ifs.eof()) {

            std::cout << " ++++++++++++++++  " << std::endl;

            ia >> g;

            std::cout << g.degrees << " : "

                 << g.minutes << " : "

                 << g.seconds << " : "

                 << g.day <<std::endl;

            std::cout << " ****************  " << std::endl;

        }*/

    }

    {

        // Using boost vector

        std::vector<gps_position> gps;

        std::ifstream ifs("filename");

        boost::archive::text_iarchive ia(ifs);

        ia >> gps;

        for (int i = 0; i < gps.size(); ++i) {

            std::cout << gps[i].degrees << " : "

                 << gps[i].minutes << " : "

                 << gps[i].seconds << " : "

                 << gps[i].day <<std::endl;

        }

    }

    return 0;

}

// File data that is being read

$ cat filename

22 serialization::archive 4 0 0 35 59 24.566999 14 Monday_Pointer 45 69 34.567001 15 Tuesday_Pointer 1 2 3.3 13 WEDNESDAY_PTR

// Output of program with while loop, don’t know why  eof is not being detected after reading three gps position objects

++++++++++++++++

35 : 59 : 24.567 : Monday_Pointer

 ****************

 ++++++++++++++++

45 : 69 : 34.567 : Tuesday_Pointer

 ****************

 ++++++++++++++++

1 : 2 : 3.3 : WEDNESDAY_PTR

 ****************

 ++++++++++++++++

terminate called after throwing an instance of 'boost::archive::archive_exception'

  what():  stream error

Aborted (core dumped)

//Output of program with using vector

terminate called after throwing an instance of 'boost::archive::archive_exception'

  what():  stream error

Aborted (core dumped)

Thanks

Priyank