Question

So I make a serialization of a single object but I had problem with several.
Here is the code:

    #include <iostream>
    #include <fstream>
    #include <string>
    using namespace std;
    class MyTest
    {
    private:
        string test;
    public:
        MyTest():test(""){};
        void setTest(const string& test) {this->test = test;};
        string getTest() const {return this->test;};
    };
    void writeToFile(const MyTest& m)
    {
        ofstream ofs("data.mbp", ios::app|ios::binary);
        ofs.clear();
        ofs.write((char *)&m, sizeof(m));
        ofs.flush();
        ofs.close();
        return;
    };
    MyTest& readTest(MyTest& m,int num)
    {
        ifstream ifs;
        ifs.open("data.mbp", ios::in|ios::binary);
        for ( int i = 1 ; i <= num ; i++)
            ifs.read((char *)&m, sizeof(m));
        return m;
    }

    int main(int argc,char* argv[])
    {
        MyTest m,t;
        m.setTest("Hello");
        writeToFile(m);
        t.setTest("World");
        writeToFile(t);
        t = readTest(t,1);
        cout << t.getTest() << endl;

        m = readTest(m,2);
        cout << m.getTest() << endl;


        return 0;
    }

The problem is that I do not know how to write two or more objects in a binary file and after that how can I read them.
Does anybody know?

Thanks in advance.

Answer 1

I recommend you using Boost – Serialization for serializing objects in C++: http://www.boost.org/libs/serialization/