Thread: Signal Slot not working, I don´t know why

QT library · Qt::DirectConnection

It use noSuchMethod so there are problems with arguments type control, sender object must be set for every signal and SignalMapper must be checked before

signal slot Signals And Slots

signal and slot in qt 使用Qt的信号和槽（Signals and Slots）机制有以下好处：松耦合：通过信号和槽，对象之间的通信是松耦合的。发送者不需要知道接收者的具体实现细节，