Как правильно считать и записать в файл

class Base
{
public:
    Base(string s=""):name(s){}
    virtual void Print()const { cout << name; }
    virtual ~Base() = 0;
private:
    string name;
};
class Derived:public Base
{
public:
    Derived(string s1 = "", string s2 = "") :Base(s1), type(s2) {}
    void Print()const { Base::Print(); cout << type; }
private:
    string type;
};
 
int main()
{
    Base*ob = new Derived("sobaka", "pydel");
    ofstream o("file.bin");
    o.write((char*)ob, sizeof(Tovar*));
 
 
}

class Base
{
public:
    Base(string s=""):name(s){}
    virtual void Print()const { cout << name; }
    virtual ~Base() {};
private:
    string name;
};
class Derived:public Base
{
public:
    Derived(string s1 = "", string s2 = "") :Base(s1), type(s2) {}
    void Print()const { Base::Print(); cout << type; }
private:
    string type;
};
 
int main()
{
    Base*ob = new Derived("sobaka", "pydel");
    ofstream o("file.bin");
    o.write((char*)ob, sizeof(Tovar*));
    ifstream fs("file.bin");
    Base*ob1=nullptr;
    fs.read(reinterpret_cast<char*>(&ob1),sizeof(Base));
    ob->Print();
    system("pause");
}

class Base
{
public:
    Base(string s=""):name(s){}
    virtual void save(std::ostream & out) const
    {
        out << name;
    }
    virtual void load(std::istream & in)
    {
        in >> name;
    }
    virtual ~Base() {}
private:
    string name;
};
 
class Derived
    :public Base
{
public:
    Derived(string s1 = "", string s2 = "")
        :Base(s1), type(s2)
    {}
 
    void save(std::ostream & out) const
    {
        Base::save(out);
        out << type;
    }
    void load(std::istream & in)
    {
        Base::load(in);
        in >> type;
    }
private:
    string type;
};
 
 
int main()
{
    Base * ob = new Derived("sobaka", "pydel");
    ofstream o("file.bin");
    ob->save(o);
    o.close();
 
    ifstream fs("file.bin");
    Base * lb = new Derived();
    lb->load(fs);
 
    lb->save(std::cout);
}