I need to use getline() every time the function is called. How to avoid repeating reading the same lines in txt? c++

Question

I need to make a function that every time I click the button, the program read and act according to a line in the log_p.txt file.

However, if I put the read t process inside the function, every time it will read the first line.

void ai_fight::getfile()
{
    std::ifstream t("log_p.txt");

    ui->pushButton->setEnabled(false);

    getline(t, rule);

    print_rule(rule);

    if(getline(t, p1hand)) print_p1hand(p1hand);

    if(getline(t, p1p)) print_p1p(p1p);

    if(getline(t, p2hand)) print_p2hand(p2hand);

    if(getline(t, p2p)) print_p2p(p2p);

    getline(t, announce);
    if(announce=="1 eliminated"||announce=="0 eliminated")
    {
        getline(t, buf);
        getline(t, buf);
        getline(t, buf);
        getline(t, buf);
        getline(t, win);
        print_win(win);
        ui->pushButton->setEnabled(true);
     }
     else if(announce=="0 winning"||announce=="1 winning")
     {
        ui->pushButton->setEnabled(true);
     }
     else qDebug()<<"----------announcement error"<<endl;
    ui->pushButton->setEnabled(true);
}

Answer 1

The simplest way is probably to store the ifstream as a class member.

void ai_fight::getfile()
{
    if (!m_t.is_open())
         m_t.open("log_p.txt");
    ...

You probably want to close the file when you reach EOF so that you can loop round.