cppdatabase.cc
author Markus Bröker <mbroeker@largo.dyndns.tv>
Tue, 01 Jun 2010 23:40:56 +0200
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/**
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 * cppdatabase.cc
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 * Copyright (C) 2009 Markus Broeker
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 *
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 * stores data in a file and retrieves it back
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 */
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#include <cstdlib>
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#include <iostream>
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#include <fstream>
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#define DB_FILE "/tmp/test.dat"
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struct Person {
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    char lastname[80];
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    char firstname[80];
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    char position[80];
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};
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void make_db_entry (std::ofstream& out, struct Person& p)
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{
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    out.write ((char *)&p, sizeof (Person));
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}
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void read_db_entry (std::ifstream& in)
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{
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    std::cout << "clear eof" << std::endl;
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    in.clear ();
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    in.seekg (0, std::ios::beg);
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    struct Person p;
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    while ((in.read ((char *)&p, sizeof (Person))) != NULL) {
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        std::cout << p.lastname << ", " << p.firstname << ", " <<
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            p.position << std::endl;
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    }
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}
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using namespace std;
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int main ()
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{
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    struct Person p[] = {
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        {"Ribery", "Franck", "Midfielder"},
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        {"Lahm", "Phillip", "Defender"},
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        {"Toni", "Luca", "Striker"},
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        {"Klose", "Miroslav", "Striker"},
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    };
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    ifstream in;
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    ofstream out;
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    out.open (DB_FILE, ios::binary);
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    if (!out) {
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        cout << "Outputfile Error " << DB_FILE << endl;
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        return EXIT_FAILURE;
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    }
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    for (unsigned int i = 0; i < sizeof (p) / sizeof (Person); i++) {
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        make_db_entry (out, p[i]);
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    }
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    out.close ();
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    in.open (DB_FILE);
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    if (!in) {
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        cout << "Inputfile Error " << DB_FILE << endl;
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        return EXIT_FAILURE;
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    }
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    read_db_entry (in);
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    read_db_entry (in);
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    in.close ();
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    return EXIT_SUCCESS;
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}