int line_counter=1;
if(file.open (QIODevice::ReadOnly | QIODevice::Text))
{
    while(!stream.atEnd())
    {
        line = stream.readLine ();
        if(!line.isNull ())
        {
            if((line_counter%5)==1)
                ui->comboBox->addItem (line);
            line_counter++;
        }
     }
 }
    stream.flush ();
    file.close ();
void Servers::on_pushButton_clicked()

if(file.open (QIODevice::ReadOnly | QIODevice::Text))
    ui->textBrowser->setText(stream.readAll());
stream.flush ();
file.close ();