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  4. How to call derived class' function from connected slot
Forum Update on Monday, May 27th 2025

How to call derived class' function from connected slot

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  • M Offline
    M Offline
    maydin
    wrote on last edited by
    #1

    For example in TCP or WebSocket server when there is a connection we connect a signal to a slot like this:

    void Server::processMessage(QByteArray message)
    {
        QWebSocket *pClient = qobject_cast<QWebSocket *>(sender());
        if(pClient) {
            doSomething();
        }
    }
    

    I tried to make doSomething() virtual but it doesnt call the overridden doSomething() function in derived class. Is there anything I can do or I have to connect one more time from derived class?

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      Can you show your complete code ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
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      • M Offline
        M Offline
        maydin
        wrote on last edited by
        #3

        It works as expected. I did a mistake in client program so therefore I couldn't see if it is called or not.

        It is solved now.

        After making 1 hour research about how signal-slot system works and what C++ compiler does, I decided to write here but found my mistake :)

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        1

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