uint argument in dbus call with python

l0drex

I want to call a dbus method that has one parameter of type uint. I couldn't figure out how to do that, since my number always gets passed as an integer.

Currently, I am calling it like this:

connection = QDBusConnection.sessionBus()
message = QDBusMessage.createMethodCall(...)
message.setArguments([0, ...])

That 0 should be of type uint

JonB

@l0drex
Hi. I do not know anything about DBus. But Python does not have any uint type.

is anything actually going wrong when you pass that 0? I would have thought it would be fine, are you sure this is a problem.

I see there is a PyPI package for uint at https://pypi.org/project/uint/. But I am not sure it is relevant. to your situation.

l0drex

@JonB I am pretty sure, since I get the following error when calling that dbus function:
ValueError: No such method 'Notify' in interface 'org.freedesktop.Notifications' at object path '/org/freedesktop/Notifications' (signature 'sisssasa{sv}i')
Using QtDbusViewer, I get the following signature: susssasa{sv}i

So as far as I understand, my 0 is being passed as an integer. Since the actual function has a uint as argument, it doesn't find it.

I already tried using ctypes.c_uint(0) instead, but that didn't work since that is seen as an object. I would like to avoid additional dependencies, since otherwise I could just use the dbus python bindings directly...

JonB

@l0drex
Then How to send unsigned values to dBus from Python ?

You can use the DBusArgument class to do this by specifying the QMetaType of the argument.

l0drex

@JonB
Thanks, but that is for PyQt5. I am using PySide6, and the API there is very different: https://doc.qt.io/qtforpython/PySide6/QtDBus/QDBusArgument.html
I currently can't figure out how to do it there.

friedemannkleint

This is currently tracked in PYSIDE-1904 . There is no good solution yet since PySide6 does not expose QVariant.