[Interest] How do i monitor DBus functions (not signals)

[Mark Gaiser]

Hi,

I'm trying to monitor "org.freedesktop.Notifications" for the notifications
(see [1] for reference) that broadcasted from there. Every notification
ends up in a "Notify" method on that dbus interface.

I'm trying to monitor that, but kinda fail at it... I can monitor the
notifications with dbus-monitor
"interface='org.freedesktop.Notifications',member='Notify',type='method_call',eavesdrop='true'",
doing the same in code is not firing the slot i'd like it to call..

The code:

...
    QDBusConnection::sessionBus().connect("",
                                          "",
                                          "org.freedesktop.Notifications",
                                          "Notify",
                                          this,
                                          SLOT(notify(QDBusMessage)));

    // This is the exact same match line as from the command.
    QString matchString =
"interface='org.freedesktop.Notifications',member='Notify',type='method_call',eavesdrop='true'";
    QDBusInterface busInterface("org.freedesktop.DBus",
"/org/freedesktop/DBus",
                                "org.freedesktop.DBus");
    busInterface.call("AddMatch", matchString);
...

In the connect line the "this" object is a simple one function class
inheriting from QObject with a "notify(QDBusMessage message)" member as
public slot.

In the app i've set the env variable: QDBUS_DEBUG=1 (for debugging purpose).

If i run my app and send a notify message like so:
notify-send -a "Chrome" "aaa"

Then i am getting console output in my app like this:
QDBusConnectionPrivate(0x623760) got message (signal):
QDBusMessage(type=MethodCall, service=":1.522",
path="/org/freedesktop/Notifications",
interface="org.freedesktop.Notifications", member="Notify",
signature="susssasa{sv}i", contents=("Chrome", 0, "", "aaa", "", {},
[Argument: a{sv} {"urgency" = [Variant(uchar): 1]}], -1) )
QDBusConnectionPrivate(0x623760) sending message (no reply):
QDBusMessage(type=Error, service="", error
name="org.freedesktop.DBus.Error.UnknownObject", error message="No such
object path '/org/freedesktop/Notifications'", signature="", contents=() )

But the slot notify(QDBusMessage) is not being called...
What am i doing wrong?

I see the error: "No such object path '/org/freedesktop/Notifications", but
if i add this to my code:
QDBusConnection::sessionBus().registerObject("/org/freedesktop/Notifications",
"org.freedesktop.Notifications", this);

I get roughly the same dbus message, but with this error:
No such interface 'org.freedesktop.Notifications' at object path
'/org/freedesktop/Notifications'

And i'm not even sure if i need to look at that error at all...

I hope someone with dbus knowledge can point me in the right direction for
this?

Thank you,
Mark


[1] http://www.galago-project.org/specs/notification/0.9/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20160113/b541b97c/attachment.html>