QPushButton clicked signal not received by main window

signal operating circuit between the slot coil and the motor When the signal lever is in the normal position , the indication wire is connected to the

In Qt, we have an alternative to the callback technique: We use signals and slots A signal is emitted when a particular event occurs Qt's

signal slot qt The signal-slot mechanism is a way to implement the observer pattern Roughly, the idea is to allow subscription of callback functions to an

signal and slot Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal Qt's signals and slots mechanism