Save object to file with customized operator : Object Serialization « File « C++

1. C++
2. File
3. Object Serialization

Save object to file with customized operator

  
#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
   
class phonebook {
  char name[80];
  char areacode[4];
  char prefix[4];
  char num[5];
public:
  phonebook() { };
  phonebook(char *n, char *a, char *p, char *nm)
  {
    strcpy(name, n);
    strcpy(areacode, a);
    strcpy(prefix, p);
    strcpy(num, nm);
  }
  friend ostream &operator<<(ostream &stream, phonebook o);
  friend istream &operator>>(istream &stream, phonebook &o);
};
   
ostream &operator<<(ostream &stream, phonebook o)
{
  stream << o.name << " ";
  stream << "(" << o.areacode << ") ";
  stream << o.prefix << "-";
  stream << o.num << "\n";
  return stream; // must return stream
}
   
istream &operator>>(istream &stream, phonebook &o)
{
  cout << "Enter name: ";
  stream >> o.name;
  cout << "Enter area code: ";
  stream >> o.areacode;
  cout << "Enter prefix: ";
  stream >> o.prefix;
  cout << "Enter number: ";
  stream >> o.num;
  cout << "\n";
  return stream;
}
   
int main()
{
  phonebook a;
  char c;
   
  fstream pb("phone", ios::in | ios::out | ios::app);
   
  if(!pb) {
    cout << "Cannot open phone book file.\n";
    return 1;
  }
   
  cin >> a;
  cout << "Entry is: ";
  cout << a;  // show on screen
  pb << a;  // write to disk

  char ch;
  pb.seekg(0, ios::beg);
  while(!pb.eof()) {
     pb.get(ch);
     if(!pb.eof()) cout << ch;
  }
  pb.clear();  // reset eof
  cout << endl;
  
  pb.close();
  
}
  
    
  

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