Write class objects to file; question

// ConsoleApplication3.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <string>
#include <fstream>      // std::ifstream
using namespace std;

// product
struct Product
{
    double price_;
    double product_index_;
    wstring product_name_;
    wstring other_data_;

    friend std::wostream& operator<<(std::wostream& os, const Product& p)
    {
         return os << p.price_ << endl
                  << p.product_index_ << endl
                  << p.product_name_ << endl
                  << p.other_data_ << endl; // error 1
    }

    friend wistream& operator>>(std::wistream& is, Product& p)
    {
        is >> p.price_ >> p.product_index_;
        is.ignore(std::numeric_limits<streamsize>::max(), '\n');

        getline(is,p.product_name_);
        getline(is,p.other_data_); // error 5, also error 2

        return is;
    }
};

 int _tmain(int argc, _TCHAR* argv[])
{
    Product s1,s2;

    s1.price_ = 100;
    s1.product_index_ = 0;
    s1.product_name_= L"flex";
    s1.other_data_ = L"dat001";

    s2.price_ = 300;
    s2.product_index_ = 2;
    s2.product_name_= L"megatex";
    s2.other_data_ = L"dat003";

    // write
    wofstream binary_file("c:\\test.dat",ios::out|ios::binary|ios::app);
    binary_file << s1 << s2;
    binary_file.close();

    // read
    wifstream binary_file2("c:\\test.dat");

    Product p;
    while (binary_file2 >> p)
    {
        if(2 == p.product_index_){
            cout<<p.price_<<endl;
            cout<<p.product_index_<<endl;
            wcout<<p.product_name_<<endl;
            wcout<<p.other_data_<<endl;
        }
    }

    if (!binary_file2.eof())
         std::cerr << "error during parsing of input file\n";
    else
        std::cerr << "Ok \n";

    return 0;
}