qt signal slot connection type - Why Does Qt Use Moc for Signals and Slots? | Qt 6.9 - doc.qt.io 888 slot 35

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Qt::DirectConnection : A direct connection is established between the signal and slot, and the slot is invoked immediately when the signal is emitted, even if the sender and receiver are in different threads.

In this section, as a continuous series of QTcpSocket, we used the signal/slot mechanism of Qt.

bool connect ( const QObject * sender, const char * signal, const char * method, Qt::ConnectionType type = Qt::AutoCompatConnection ) const.