EnArBgDeElEsFaFiFrHiHuItJaKnKoMsNlPlPtRuSqThTrUkZhQt Connect To Slot In Base ClassQt Connect Slot Base ClassicConnecting in Qt 5. There are several ways to connect a signal in Qt 5. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget). QObject::connect: No such slot QCcmStatusPanel:..