sp0205

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

#include "stdafx.h"
#include <iostream>
#include <fstream>
using namespace std;

int demo01();
int demo02();
int demo03();

int _tmain(int argc, _TCHAR* argv[])
{
    demo01();
    demo02();
    demo03();
    return 0;
}


int demo01() {
    ofstream myfile;
    myfile.open("example.txt");
    myfile << "Writing this to a file.\n";
    myfile.close();
    return 0;
}


int demo02() {
    ofstream myfile("example.txt");
    if (myfile.is_open())
    {
        myfile << "This is a line.\n";
        myfile << "This is another line.\n";
        myfile.close();
    }
    else cout << "Unable to open file";
    return 0;
}

int demo03() {
    streampos size;
    char * memblock;

    ifstream file("example.bin", ios::in | ios::binary | ios::ate);
    if (file.is_open())
    {
        size = file.tellg();
        memblock = new char[static_cast<int>(size)];
        file.seekg(0, ios::beg);
        file.read(memblock, size);
        file.close();

        cout << "the entire file content is in memory";

        delete[] memblock;
    }
    else cout << "Unable to open file";
    return 0;
}