I am now trying the following: passing sender()->objectName().toInt() of a QPushButton in the systembutton_clicked(..., ..., ...) function. However, the program crashes on click of btnTest. So how can I let the program know which btnTest is clicked so a button can be added to the right groupBox? How to get it right so it not crashes?


Qt Code: 
  1. void MyWidget::systembutton_clicked(int j, QGroupBox *groupBox, QVBoxLayout *vbox)
  2. {
  3.  
  4.         systemcounter[j] += 1;
  5.     QLayoutItem *child;
  6.     while ((child = vbox->takeAt(0)) != 0){
  7.         delete child;
  8.     }
  9.     for(int i = 0; i<systemcounter[j]; i++){
  10.         QPushButton *btnGtr = new QPushButton();
  11.         btnGtr->setText(QString("Guitar: %1").arg(i+1));
  12.         vbox->addWidget(btnGtr);
  13.         QObject::connect(btnGtr, SIGNAL (clicked()), this, SLOT (handleButton()));
  14.     }
  15.  
  16.     mainLayout->addWidget(groupBox);
  17.  
  18. }
  19.  
  20. void MyWidget::onaddbutton_clicked()
  21. {
  22.     pagecounter += 1;
  23.     systemcounter = new int[pagecounter];
  24.     systemcounter[pagecounter-1] = 0;
  26.  
  27.     QGroupBox *groupBox = new QGroupBox(tr("&Page %1").arg(pagecounter));
  28.     QPushButton *btnTest = new QPushButton("G", this);
  29.     btnTest->setObjectName(QString::number(pagecounter-1));
  30.  
  31.     top->addWidget(groupBox);
  32.     top->addWidget(btnTest);
  33.     top->maximumSize();
  34.  
  35.     mainLayout->addLayout(top);
  36.  
  37.     QVBoxLayout *vbox = new QVBoxLayout;
  38.     groupBox->setLayout(vbox);
  39.     connect(btnTest, &QPushButton::clicked, [=] {
  40.         emit systembutton_clicked(sender()->objectName().toInt(), groupBox, vbox);
  41.     });
  42. }
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