解决 error: no matching member function for call to ‘connect‘

When connecting the signal slot, an error is reported error: no matching member function for call to 'connect'.

connect(comboBox_com, &QComboBox::highlighted, this, &testOptionUSBRemote::refreshComList);

The reason is that the signal has been overloaded and has the same name, but the parameters are different, and this error will be reported.

Q_SIGNALS:
    void highlighted(int index);
    void highlighted(const QString &);

In this case, the legacy syntax needs to be used.

connect(comboBox_com, SIGNAL(highlighted(int)), this, SLOT(refreshComList(int)));