C++二进制文件的读写

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//This program uses the write and read functions.
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
    //File object used to access file
    fstream file("nums.dat", ios::out | ios::binary);
    if (!file)
    {
        cout << "Error opening file.";
        return 0;
    }
    //Integer data to write to binary file
    int buffer[ ] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    int size = sizeof(buffer) / sizeof(buffer[0]);
    // Write the data and close the file
    cout << "Now writing the data to the file.\n";
    file.write(reinterpret_cast<char *>(buffer), sizeof(buffer));
    file.close ();
    // Open the file and use a binary read to read contents of the file into an array
    file.open("nums.dat", ios::in);
    if (!file)
    {
        cout << "Error opening file.";
        return 0;
    }
    cout << "Now reading the data back into memory.\n";
    file.read(reinterpret_cast<char *>(buffer), sizeof (buffer));
    // Write out the array entries
    for (int count = 0; count < size; count++)
        cout << buffer[count] << " ";
    // Close the file
    file.close ();
    return 0;
}