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Cannot receive response from DBus

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  • C Offline
    C Offline
    Crindu
    wrote on last edited by
    #1

    I'm creating a custom service and object using QDbus and I'm using D-feet for testing purposes. I noticed that if I put all code in the main class, all works fine, otherwise it crashes.
    This works, I can see the service and the object correctly created with d-feet:

    int main(int argc, char *argv[])
    {
        QCoreApplication a(argc, argv);
        QDBusConnection session = QDBusConnection::sessionBus();
        QString myService = QString("test.example");
        QDBusObjectPath agentPath = QDBusObjectPath("/testagent");
        OrgBluezAgent1Interface* agent = new OrgBluezAgent1Interface(myService,agentPath.path(),session);
        Agent1Adaptor adaptor(agent);
        cout << "register service "<<boolalpha<<session.registerService(myService)<<endl;
        cout << "register object " <<boolalpha<<session.registerObject(agentPath.path(),agent)<<endl;
    
    
        //busTest b;
        return a.exec();
    }
    

    This is the not working version, in particular, D-feet crashes when I try to click on the service created with the following error: org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying.

    busTest::busTest(QObject *parent)
        :   QObject(parent),bus(QDBusConnection::systemBus())
    {
        QDBusConnection session = QDBusConnection::sessionBus();
        QString myService = QString("test.example");
        QDBusObjectPath agentPath = QDBusObjectPath("/testagent");
        OrgBluezAgent1Interface* agent = new OrgBluezAgent1Interface(myService,agentPath.path(),session);
        Agent1Adaptor adaptor(agent);
        cout << "register service "<<boolalpha<<session.registerService(myService)<<endl;
        cout << "register object " <<boolalpha<<session.registerObject(agentPath.path(),agent)<<endl;
    }
    

    I'm also monitoring the dbus messages with dbus-monitor --session
    but I cannot find a suitable solution, it seems that something is destroyed in the busTest class and so I cannot receive the dbus response. Thanks

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      Why are you getting both the system and session bus ?

      Your Agent1Adaptor object will be destroyed at the end of the constructor.

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

      C 1 Reply Last reply
      1
      • SGaistS SGaist

        Hi,

        Why are you getting both the system and session bus ?

        Your Agent1Adaptor object will be destroyed at the end of the constructor.

        C Offline
        C Offline
        Crindu
        wrote on last edited by
        #3

        @SGaist You're right,I did not think about it! I have to remove the systemBus, I'm not using it in reality, it's part of the project that I found on Github. Ok then I can try to make it an instance variable of the class or similer. Thank you!

        1 Reply Last reply
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