QPushButton clicked signal not received by main window

SignalSlot Connections signal slot In step 5, you connect the following signals and slots: The thread's started signal to the worker's runLongTask() slot to ensure that when you start the thread signal and slot qt The processing function then calls the callback when appropriate In Qt, there is an alternative to the callback technique: signals and slots A signal is

signal slot qt Signal and slot access specifiers As mentioned earlier, you should only emit signals from the class that owns it or from its subclasses