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Cannot receive response from DBus



  • 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


  • Lifetime Qt Champion

    Hi,

    Why are you getting both the system and session bus ?

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



  • @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!


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