How to pass variables to slot methods in QT?

Question

I\'m making a little chat messenger program, which needs a list of chat channels the user has joined. To represent this list graphically, I have made a list of QPushButton

Answer 1

Use QSignalMapper to pass variables;

        QSignalMapper* signalMapper = new QSignalMapper (this) ;
        QPushButton *button = new QPushButton();


         signalMapper -> setMapping (button, ) ;
         connect (signalMapper, SIGNAL(mapped(QString)), this,   
                   SLOT(buttonClicked(QString))) ;

in slot i.e

void class::buttonClicked(QString data){

    //use data
    // to get sender 
    QSignalMapper *temp = (QSignalMapper *)this->sender();
    QPushButton *btn = (QPushButton *)temp->mapping(data);
    // use btn

}

Hope my ans may help you