Couldn't received service registered signal when using QDBusServiceWatcher.

Hieu Nguyen

Hi all,
I tried bellow code:

void DbusWatcher::initDbus(QString service, QString path)
{
    QDBusConnection bus = QDBusConnection::sessionBus();
    if (bus.isConnected())
    {
        qDebug() << "Dbus connected";

        QDBusServiceWatcher watcher(service, bus, QDBusServiceWatcher::WatchForRegistration);
        connect(&watcher, SIGNAL(serviceRegistered(QString)), this, SLOT(slotServiceRegistered(QString)));

        if (!bus.registerService(service))
        {
            qDebug() << "Error register Service";
        }
        if (!bus.registerObject(path,this))
        {
            qDebug() << "Error register ObjectPath";
        }
    }
}

void DbusWatcher::slotServiceRegistered(const QString service)
{
    qDebug() << "serviceRegister: " << service;
}

My main.cpp file:

#define SERVICE_NAME        "com.abc.AppTest"
#define OBJECT_PATH         "/com/abc/AppTest"

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    DbusWatcher myTest;
    myTest.initDbus(SERVICE_NAME, OBJECT_PATH);

    return app.exec();
}

I expect that when com.abc.AppTest service is registered, Dbus will emit serviceRegistered signal. But when I ran this application, I didn't see any log text like "serviceRegister: " in slotServiceRegistered(). So what's wrong in this code? Thanks a lot :)

Hieu Nguyen

I have found solution for this, using QDbusConnectionInterface instead QDbusServiceWatcher:

connect(QDBusConnection::sessionBus().interface(), &QDBusConnectionInterface::serviceRegistered, this, [=](QString a) {
            qDebug() <<"service R: " << a;
        });