面试题整理-C++ 序列化对象

题目：在C++里面，两台机器之间的函数相互调用，需要传递对象。采用什么样的方法可以把C++对象序列化之后，在两台机器之间，像字符串一样传输。解法：想到boost库中是有一个序列化类的。在这里，我们直接利用这个类来进行处理。

#include <fstream>
#include <sstream>
#include <iostream>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>

using namespace std;

class gps_position
{
private:
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & degrees;
ar & minutes;
ar & seconds;
}
int degrees;
int minutes;
float seconds;
public:
gps_position()
{
degrees = 0;
minutes = 0;
seconds = 0.0;
};

gps_position(int d, int m, float s) :
degrees(d), minutes(m), seconds(s)
{}

};

class bus_stop
{
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & latitude;
ar & longitude;
}
gps_position latitude;
gps_position longitude;

public:
bus_stop(){ }
bus_stop(const gps_position & lat_, const gps_position & long_) :
latitude(lat_), longitude(long_){ }
virtual ~bus_stop(){ }
};

class bus_stop_corner : public bus_stop
{
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & boost::serialization::base_object<bus_stop>(*this);
ar & street1;
ar & street2;
}
std::string street1;
std::string street2;
public:
bus_stop_corner(){}
bus_stop_corner(const gps_position & lat_, const gps_position & long_,
const std::string & s1_, const std::string & s2_
) :
bus_stop(lat_, long_), street1(s1_), street2(s2_)
{}
virtual std::string description() const
{
return street1 + " and " + street2;
}

};

int main() {
const gps_position latitude(1, 2, 3.3f);
const gps_position longitude(4, 5, 6.6f);
bus_stop_corner stop_corner(latitude, longitude, "corn1", "corn2");

ostringstream ostr;
{
boost::archive::text_oarchive oa(ostr);
oa << stop_corner;
}

string comment = ostr.str();
cout << comment << endl;
istringstream iis(comment);

bus_stop_corner new_stop_corner;
{
istringstream istr;
boost::archive::text_iarchive ia(iis);
ia >> new_stop_corner;
}
return 0;
}

这里使用的是boost的序列化操作。

首先安装boost库。

apt-get install libboost1.48-all-dev

编译

g++ test.cpp -o test -lboost_serialization