1 /**

     2  * cppdatabase.cc

     3  * Copyright (C) 2009 Markus Broeker

     4  *

     5  * stores data in a file and retrieves it back

     6  */

     7 

     8 #include <cstdlib>

     9 #include <iostream>

    10 #include <fstream>

    11 

    12 #define DB_FILE "/tmp/test.dat"

    13 

    14 struct Person {

    15     char lastname[80];

    16     char firstname[80];

    17     char position[80];

    18 };

    19 

    20 void make_db_entry (std::ofstream& out, struct Person& p)

    21 {

    22     out.write ((char *)&p, sizeof (Person));

    23 }

    24 

    25 void read_db_entry (std::ifstream& in)

    26 {

    27     std::cout << "clear eof" << std::endl;

    28     in.clear ();

    29     std::cout << "seek status: " << in.seekg (0, std::ios::beg) <<

    30         std::endl << std::endl;

    31 

    32     struct Person p;

    33 

    34     while ((in.read ((char *)&p, sizeof (Person))) != NULL) {

    35         std::cout << p.lastname << ", " << p.firstname << ", " <<

    36             p.position << std::endl;

    37     }

    38 }

    39 

    40 using namespace std;

    41 

    42 int main ()

    43 {

    44     struct Person p[] = {

    45         {"Ribery", "Franck", "Midfielder"},

    46         {"Lahm", "Phillip", "Defender"},

    47         {"Toni", "Luca", "Striker"},

    48         {"Klose", "Miroslav", "Striker"},

    49     };

    50 

    51     ifstream in;

    52     ofstream out;

    53 

    54     out.open (DB_FILE, ios::binary);

    55     if (!out) {

    56         cout << "Outputfile Error " << DB_FILE << endl;

    57         return EXIT_FAILURE;

    58     }

    59 

    60     for (unsigned int i = 0; i < sizeof (p) / sizeof (Person); i++) {

    61         make_db_entry (out, p[i]);

    62     }

    63     out.close ();

    64 

    65     in.open (DB_FILE);

    66     if (!in) {

    67         cout << "Inputfile Error " << DB_FILE << endl;

    68         return EXIT_FAILURE;

    69     }

    70 

    71     read_db_entry (in);

    72     read_db_entry (in);

    73 

    74     in.close ();

    75 

    76     return EXIT_SUCCESS;

    77 }