Methods returning non-trivial types fail

[nburkitt]

I'm using Python 3.4. I don't know the version of pydbus as I was unable to find a documented method for discovering it. Methods that return simple types (e.g. "i", "s", "d") work as expected, but methods that return structs (e.g. "(ddd)") fail.

As an example, my (Linux) service publishes an object.method Imu.GetOrientation that returns three doubles.

Introspection via qdbus returns:

method QDBusRawType::(ddd) com.xxx.yyy.v1.GetOrientation()

pydbus reports the same signature:

import pydbus BusAddress = "xxx" BusName = "yyy" bus = pydbus.connect( BusAddress ) Imu = bus.get( BusName, '/IMU' ) help(Imu.GetOrientation)

Help on method GetOrientation in module pydbus.proxy_method: GetOrientation() -> (ddd) method of DBUS. instance

Attempting to call the method returns:

Imu.GetOrientation()

Traceback (most recent call last): File "", line 1, in File "/root/hb/lib/python3.4/site-packages/pydbus/proxy_method.py", line 75, in call 0, timeout_to_glib(timeout), None).unpack() gi._glib.GError: Method 'GetOrientation' returned type '(ddd)', but expected '((ddd))'

Calling the same method via qdbus returns the three doubles and no complaints.

[nburkitt]

Oh, never mind. The problem was actually that my application was NOT returning an object, but a sequence of basic types.