Help with binary I/O

Hi there,

I'm trying to save a vector data structure to a binary file, then read
it back and see if all the contents are intact. So I'm trying to
following code below :

#include "stdafx.h"
#include <stdio.h>
#include <vector>
#include <iostream>
#include <fstream>

using namespace std;

void main() {

      //
      // Create a test vector of integers and populate with test data
      //
      vector<int> int_ls;

      int_ls.push_back(100);
      int_ls.push_back(200);
      int_ls.push_back(300);
      int_ls.push_back(400);
      int_ls.push_back(500);

      //
      // Dump the contents of the integer vector to a binary file
      //
      fstream binfile("fstream.out", ios::out|ios::binary);
      binfile.seekp(0, ios::end);
      binfile.write((char*)&int_ls,sizeof(int_ls));
      binfile.close();

      //
      // Re-open the binary file and this time read the values and
store again in vector structure
      //
      vector<int> int_ls2;
      fstream binfile2("fstream.out", ios::out|ios::in|ios::binary);
      binfile2.seekg(0, ios::beg);

      while (!binfile2.eof()) {
           binfile2.read((char*)&int_ls2, sizeof(int_ls2));
      }

      binfile2.close();

      //
      // Now let's display what we just read in
      //
      int DATA_SIZE = int_ls2.size();

      for (i=0; i<DATA_SIZE; i++) {
            printf("\n int_ls2[%d] --> %d", i, int_ls2[i]);
      };

}

** The above code manages to save to a file and even retrieve all the
values, but somehow I get an assert before it terminates.

** More info: I'm compiling it using Visual C++ 2008 as a Console
Application.

Thanks in Advance,
Joseph