@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!

@Mark81 ok, I found a way:

QDBusInterface *iface = new QDBusInterface("your.service", "/your/path", "org.freedesktop.DBus.Introspectable", QDBusConnection::systemBus(), this); qDebug() << iface->call("Introspect").arguments();

@Mark81
Hi,

I'm not sure if it is returned from some DBus methods or I have to manually build it using the bluetooth address and the local device.

It is not, you have to handle it manually. From what I can discern from your link it's a path you construct out of device names. If the service is compliant you can usually list the objects it exposes.

Kind regards.

Hi and welcome to devnet,

Since it might need some knowledge of the internals of QtDBus, I'd recommend posting this question on the interest mailing list You'll find there Qt's developers/maintainers (this forum is more user oriented)

I got it working. Problem was that instead of bool I had to use QVariant of QDBusVariant type. So the two functions look like this now:

These are the defines I've used:

#define BLUEZ_DBUS_SERVICE "org.bluez" #define BLUEZ_DBUS_PATH "/org/bluez/hci0" #define BLUEZ_DBUS_IF "org.bluez.Adapter1"

And here is the first implementationÖ

QDBusConnection bus = QDBusConnection::systemBus(); if (!bus.isConnected()) { qFatal("Cannot connect to the D-Bus session bus."); return; } QDBusMessage message = QDBusMessage::createMethodCall(BLUEZ_DBUS_SERVICE, BLUEZ_DBUS_PATH, "org.freedesktop.DBus.Properties", "Set"); QList<QVariant> arguments; arguments << BLUEZ_DBUS_IF << "Powered" << QVariant::fromValue(QDBusVariant(true)); message.setArguments(arguments); QDBusPendingReply<QVariantMap> reply = bus.asyncCall(message); reply.waitForFinished();

and here is the second possibility to implement the method call:

QDBusConnection bus = QDBusConnection::systemBus(); if (!bus.isConnected()) { qFatal("Cannot connect to the D-Bus session bus."); return; } QDBusInterface dbus_iface(BLUEZ_DBUS_SERVICE, BLUEZ_DBUS_PATH, "org.freedesktop.DBus.Properties", bus); if ( dbus_iface.isValid() ) { QDBusPendingReply<QVariantMap> reply = dbus_iface.asyncCall("Set", BLUEZ_DBUS_IF, "Powered", QVariant::fromValue(QDBusVariant(true))); reply.waitForFinished(); reply.error().message(); }

In case anybody wants to do the same thing there is also the possibility to set the "Powered" property directly:

QDBusInterface ifc( BLUEZ_DBUS_SERVICE, BLUEZ_DBUS_PATH, BLUEZ_DBUS_IF, QDBusConnection::systemBus()); if ( ifc.isValid() ) { ifc.setProperty("Powered", true); }