How to get the row number of the QComboBox in QTableWidget

Question

Here is the code, but it dos not work. Who can create the code. Thanks very much!

void add() {

QComboBox *ziduan = new QComboBox;

ziduan->addItem("年度","nd");

int row =0;

int col =1;

QSignalMapper* signalMapper = new QSignalMapper(this); 

connect(ziduan, SIGNAL(currentIndexChanged(int)), signalMapper, SLOT(map())); 

signalMapper->setMapping(ziduan, QString("%1-%2").arg(row).arg(col)); 

connect(signalMapper, SIGNAL(mapped(const QString &)),this, SIGNAL(changeZiduan(const QString &))); 

}

void sqlGenerator::changeZiduan(const QString &position) {

 QStringList coordinates = position.split("-"); 

 int row = coordinates[0].toInt(); 

 int col = coordinates[1].toInt(); 

}