listButton = new QList<QPushButton*>;

        //some code here

        QPushButton *button = new QPushButton(QString::number(1),ui->widget);
        button->setGeometry(50, 50, 30, 30);
        button->setStyleSheet("background-color:red;");
        QObject::connect(button, SIGNAL(clicked()), this, SLOT(selectP()));
        listeButton->append(button);

        //some code here

        void selectP()
        {
              //I'd like to print here, coordinates of the button which has called "selectP()"
        }