Qt signal on buttongroup not connected

I have a buttongroup defined with two radiobuttons

buttonGroupFFTDimension = new QButtonGroup(this);
buttonGroupFFTDimension->addButton(ui->radioButton1D, 1);
buttonGroupFFTDimension->addButton(ui->radioButton2D, 2);
buttonGroupFFTDimension->setExclusive(true);
ui->radioButton1D->setChecked(true);

The connect also compiles

connect(this->buttonGroupFFTDimension, static_cast<void(QButtonGroup::*)(int)>(&QButtonGroup::buttonClicked),
        this, &MainWindow::on_buttonGroupFFTDimension_buttonClicked);

but it throws and error at runtime

QMetaObject::connectSlotsByName: No matching signal for on_buttonGroupFFTDimension_buttonClicked(int)

I admit that I am not familiar with the new connect syntax, but also do not see the obvious error. What is wrong?

The message shown is because you are using Qt Designer and it uses the connectSlotsByName method to connect various elements, it recognizes the format on_somesender_somesignal, and in your case matches your slot.

• First solution: It iss unnecessary to use the connect function, this will automatically do it. Also I think that the slot does not have as parameter the type int that requires.

In your case the slot should be as follows:

private  slots:
    void on_buttonGroupFFTDimension_buttonClicked (int val);

• Another possible solution is to rename the slot, after that you run make clean and qmake.