Connect lambda, sender argument must be string from array

[bchinfosieeuw]

How can I send a string from an array with connect using the lambda-notation? I want to send btnTest[pagecounter-1] as the first argument of the connect, but the compiler says 'no matching function for call to ...'

btnTest = new QPushButton[pagecounter];//("G", this);
    btnTest[pagecounter-1].setMaximumSize(QSize(20,20));
 
    btnTest[pagecounter-1].setObjectName(QString::number(pagecounter-1));
 
    top->addWidget(groupBox);
    top->addWidget(btnTest, pagecounter-1);
    top->maximumSize();
 
    mainLayout->addLayout(top);
 
    QVBoxLayout *vbox = new QVBoxLayout;
    groupBox->setLayout(vbox);
 
    connect(btnTest[pagecounter-1], &QPushButton::clicked, [=] {
        emit systembutton_clicked(btnTest[pagecounter-1].objectName().toInt(), 1, vbox);
    });

btnTest = new QPushButton[pagecounter];//("G", this);
    btnTest[pagecounter-1].setMaximumSize(QSize(20,20));

    btnTest[pagecounter-1].setObjectName(QString::number(pagecounter-1));

    top->addWidget(groupBox);
    top->addWidget(btnTest, pagecounter-1);
    top->maximumSize();

    mainLayout->addLayout(top);

    QVBoxLayout *vbox = new QVBoxLayout;
    groupBox->setLayout(vbox);

    connect(btnTest[pagecounter-1], &QPushButton::clicked, [=] {
        emit systembutton_clicked(btnTest[pagecounter-1].objectName().toInt(), 1, vbox);
    });

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