main.cpp

C++ Source code from a tutorial

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

using namespace std;

void WriteFile() {
    ofstream MyFile("/seek.dat");
    
    // First batch
    MyFile.put(5);
    MyFile.write("abcde", 5);
    
    // Second batch
    MyFile.put(8);
    MyFile.write("qwertyui", 8);
    
    MyFile.close();    
}

void ReadFile() {
    ifstream MyFile("/seek.dat");
    
    // Read first byte and skip past
    // the first batch.
    int x = (int)(MyFile.get());
    MyFile.seekg(x, ios_base::cur);
    
    // Read the second batch
    x = (int)(MyFile.get());
    char *ptr = new char[x + 1];
    ptr[x] = '\0';
    MyFile.read(ptr, x);
    cout << ptr << endl;
    
    // Return to previous batch
    MyFile.seekg(0, ios_base::beg);
    x = (int)(MyFile.get());
    ptr = new char[x + 1];
    ptr[x] = '\0';
    MyFile.read(ptr, x);
    cout << ptr << endl;
    
    // Try travling from the end, just for grins.
    MyFile.seekg(-5, ios_base::end);
    char ch = MyFile.get();
    cout << ch << endl;
    
    MyFile.close();
}

int main(int argc, char *argv[])
{
    WriteFile();
    ReadFile();
    system("PAUSE");
    return 0;
}