C++ Socket recv() order error

Question

I want to create a RCON-sender in C++ for Jedi Academy Multiplayer Game. Everything works fine, only problem is that, when I read recv() from server, the order is not corrent sometimes!

std::vector<std::string> ReceiveLine() {
    std::vector<std::string> ret;
    char* r = new char[1024];

    int i = 0;

    while (i < 40) {
        for(unsigned int j=0; j<1024; ++j) r[j]=0;
        if (recv(s_, r, 1024, 0) <= 12) {
            break;
        }
        ret.push_back(r+10);
        ++i;
    }
    return ret;
}

It prints like this:

map: mp/ffa3
num score ping name            lastmsg address               qport rate
  4     0    0 Alora                33                   bot  6145 16384
  5     0    0 Alora                33                   bot 22058 16384
  6     0    0 Alora                33                   bot 60636 16384
  7     0    0 Alora                33                   bot 18312 16384
  8     0    0 Alora                33                   bot 11812 16384
--- ----- ---- --------------- ------- --------------------- ----- -----
  0     0   22 test                  0   XX.XX.XXX.XXX:29070 65099 25000
  1     0    0 Alora                33                   bot  9234 16384
  9     0    0 Alora                33                   bot 27681 16384
 10     0    0 Alora                33                   bot 19116 16384
 11     0    0 Alora                33                   bot  3514 16384
  2     1    0 Alora                33                   bot 65099 16384
 12     0    0 Alora                33                   bot  5972 16384
  3     0    0 Alora                33                   bot 41129 16384
 13     0    0 Alora                33                   bot 30716 16384

It should be in order by num (Works in PHP)

Answer 1

UDP does not guarantee ordered delivery. There are lots of reasons why a datagram might arrive out of order.