C++ (Qt)
 
    stationInstall lastInstall = station->loadSettings();
 
    nameComPort = lastInstall.name;
    QString str = lastInstall.name;
    str.remove(0,3);//delete "COM" of name comport;
    bool ok = true;
    int num = str.toInt(&ok,10);
    qDebug()<<"num = "<<num;
    if(num >= 1)
    {
      w485->cbCPortName->setCurrentIndex(num-1);//??????????
    }
 

C++ (Qt)
 
//В конструкторе
 w485  = new widget485;
 
 

C++ (Qt)
widget485::widget485(QWidget *parent):
    QWidget(parent)
{
    cbCPortName = new QComboBox(this);
    for(int i = 0; i<12; i++)
    {
        cbCPortName->addItem("COM"+QVariant(i+1).toString());
    }
}