Object Serialization C++

[AMCerasoli]

Hi there!

I'm trying to serialize some of my objects, but when they're pointers I don't know how to do it... I have being studying this code that I found in internet and I can understand it (I think), but I don't know why when I'm using pointers to objects I can't make it work.

#include <fstream>
#include <iostream>
using namespace std;

class person{
   protected:
      char name[80];
      int age;
   public:
      void getData(){
         cout << "\n   Enter name: "; cin >> name;
         cout << "   Enter age: "; cin >> age;
      }
      void showData(){
         cout << "\n   Name: " << name;
         cout << "\n   Age: " << age;
      }
};
int main(){
   char ch;
   //preson  pers;
   person *pers = new person; // pers now is a pointer

   fstream file;

   file.open("GROUP.DAT", ios::app | ios::out |  ios::in );
   do {
      cout << "\nEnter person's data:";
      pers->getData();

    //file.write( reinterpret_cast<char*>(&pers), sizeof(pers) ); //No pointer
      file.write( reinterpret_cast<char*>(pers), sizeof(pers) );  //Pointer
      cout << "Enter another person (y/n)? ";
      cin >> ch;
   }while(ch=='y');
   file.seekg(0);

 //file.read( reinterpret_cast<char*>(&pers), sizeof(pers) ); //No pointer
   file.read( reinterpret_cast<char*>(pers), sizeof(pers) );  //Pointer
   
   while( !file.eof() ){
      cout << "\nPerson:";
      pers->showData();
  //file.read( reinterpret_cast<char*>(&pers), sizeof(pers) ); //No pointer
    file.read( reinterpret_cast<char*>(pers), sizeof(pers) );  //Pointer
   }
   
   cout << endl;
   return 0;
}

The problem is that at the end always give me the last name with the last age that I have introduced, but when I'm not using a pointer that doesn't happen... Why could be this happening?

[Turbine]

I've made a simple example, it loads/saves one person and an array of people.

#include <string>
#include <iostream>
#include <cstring>
#include <stdlib.h>
#include <fstream>

using namespace std;

class Person {
public:
   char name[80];
   int age;

   Person(){}
   Person(const char* n, int age): age(age)
   {
      strcpy(name, n);
   }
};

int main ()
{
   const char* FILENAME = "Z:\\Temp\\file.txt";
   const int NUM = 10;
   ofstream outfile;
   ifstream infile;

   //Save person
   Person* person1 = new Person("Joe", 10);
   outfile.open(FILENAME, ofstream::trunc);
   outfile.write((char*)person1, sizeof(Person));
   outfile.close();

   //Load person
   Person* person2 = new Person();
   infile.open(FILENAME);
   infile.read((char*)person2, sizeof(Person));
   infile.close();

   cout << person2->name << endl;

   //Save array
   Person* persons = new Person[NUM];

   for(int i = 0; i < NUM; i++)
      itoa(i, &persons[i].name[0], 10);  //Just assign number as each person's name

   outfile.open(FILENAME, ofstream::trunc);
   outfile.write((char*)persons, sizeof(Person) * NUM);
   outfile.close();

   //Load array
   Person* persons2 = new Person[NUM];
   infile.open(FILENAME);
   infile.read((char*)persons2, sizeof(Person) * NUM);
   infile.close();

   cout << persons2[5].name << endl;

   return 0;
}