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Qt MQTT and while loop

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  • G Offline
    G Offline
    Guigiidre
    wrote on 16 Jan 2019, 10:31 last edited by
    #1

    Hello!

    I' m using Qt Mqtt on Windows and I have troubles to publish a message in a while loop.

    For example:

        int n=0;
        while (n<5){
            qDebug()<<Q_FUNC_INFO<<endl;
            mClient->publish(QMqttTopicName(topic.toString()),data.toByteArray());
            Sleep(20000);
            n++;
        }
    

    with this code, publishments are all made at the same time and after exiting the while loop. But this is not what I want, I would like a publishement every 2 seconds during the execution of the while loop.

    Thank you in advance for telling me how to achieve this.

    guigiidre

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    • S Offline
      S Offline
      SGaist
      Lifetime Qt Champion
      wrote on 16 Jan 2019, 10:33 last edited by
      #2

      Hi and welcome to devnet,

      You are blocking the event loop which explains what is going on.

      A QTimer would likely be a cleaner approach. Let it timeout 5 times and then stop it.

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

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      • G Offline
        G Offline
        Guigiidre
        wrote on 16 Jan 2019, 13:50 last edited by
        #3

        Great, it works, Qtimer was the solution.
        Thank you!

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        0

        1/3

        16 Jan 2019, 10:31

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