Binary file read class records into a vector!

heskyttberg,

You could try a few things like declare fs as ifstream object.

Dhyanesh

Hi!

After first record is read from file, I get segmentation fault when trying to push it into the vector.

I haven't got a clue as to what I'm doing wrong.
ofstream and ifstream won't help.

The following code works:
// --- START ---
#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
#include <vector>
#include "mp3.h"

using namespace std;

main(int argc, char *argv[]) {

   typedef vector<mp3> myMp3Array;
   myMp3Array mp3Vec;
   fstream fs;

   fs.open("test.dat", ios::in | ios::out | ios::binary);

   mp3 tmp1 ("Jump","Jump","/opt/data/hardrock/VanHalen/Jump.mp3","Van Halen",268);
   mp3 tmp2 ("Erotica","Erotica","/opt/data/mp3/pop/Madonna/Erotica/Erotica.mp3","Madonna",268);
   mp3 tmp3 ("Crusader","Crusader","/opt/data/mp3/hardrock/Saxxon/Crusader.mp3","Saxxon",268);
   mp3 tmp4 ("Jump","Jump","/opt/data/mp3/hardrock/VanHalen/Jump.mp3","Van Halen",268);
   mp3 tmp5 ("Erotica","Erotica","/opt/data/mp3/pop/Madonna/Erotica/Erotica.mp3","Madonna",268);

   mp3 tmp6;
   mp3 tmp7;
   mp3 tmp8;
   mp3 tmp9;
   mp3 tmp10;

   fs.seekg (0, ios::beg);
   fs.write((char*)  &tmp1, sizeof(mp3));
   fs.write((char*)  &tmp2, sizeof(mp3));
   fs.write((char*)  &tmp3, sizeof(mp3));
   fs.write((char*)  &tmp4, sizeof(mp3));
   fs.write((char*)  &tmp5, sizeof(mp3));
   fs.close();

   fs.open("test.dat", ios::in | ios::out | ios::binary);
   fs.read((char*)  &tmp6, sizeof(mp3));
   fs.read((char*)  &tmp7, sizeof(mp3));
   fs.read((char*)  &tmp8, sizeof(mp3));
   fs.read((char*)  &tmp9, sizeof(mp3));
   fs.read((char*) &tmp10, sizeof(mp3));
   fs.close();



   mp3Vec.push_back(tmp1);
   mp3Vec.push_back(tmp2);
   mp3Vec.push_back(tmp3);
   mp3Vec.push_back(tmp4);
   mp3Vec.push_back(tmp5);
   mp3Vec.push_back(tmp6);
   mp3Vec.push_back(tmp7);
   mp3Vec.push_back(tmp8);
   mp3Vec.push_back(tmp9);
   mp3Vec.push_back(tmp10);

   for (myMp3Array::iterator it = mp3Vec.begin(); it!=mp3Vec.end(); it++) {
      tmp1 = *it;
      cout << tmp1.getArtist() << " ";
   }

  cout << endl;
}
// --- END ---

So why dosen't the code where I'm reading from file in a loop work ?
I really don't understand this, hoping for some expert help here.

Regards
/Hasse

'mp3' type you defined may be variable, defining a vector 'typedef vector<mp3*> myMp3Array' instead.

your data is stored in heap, remember to deallocate when exiting.