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Details

Type: Bug
Resolution: Unresolved
Priority: Not Evaluated
Fix Version/s: None
Affects Version/s: 6.6.1
Component/s: PySide
Labels:
None
Environment:
Ubuntu 22.04 LTS
Python 3.10.12

Platform/s:

Linux/Wayland, Linux/X11
Commits:
2c3bf4273 (dev), ead40ef99 (6.6), 8f984a8a6 (tqtc/lts-6.5), a8fcf4414 (dev)

Description

Hello,

I am trying to connect to a DBus Signal with PySide6, but don't get it to work and wonder if the signature stated in the docs is really correct.

I am trying to get a notification, when a new service name is on the system DBus...

import sysfrom PySide6 import QtDBus
from PySide6.QtCore import QLibraryInfo, qVersion
from PySide6.QtWidgets import QApplication, QMainWindow

class MainWindow(QMainWindow):
    def __init__ (self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        service = 'org.freedesktop.DBus'
        path = '/org/freedesktop/DBus'
        iface = 'org.freedesktop.DBus'
        conn = QtDBus.QDBusConnection.systemBus()
        #conn.connect(service, path, iface, "NameOwnerChanged", self.nameownerchangeslot, "nameownerchangeslot")
        #this brings up:
        #TypeError: 'PySide6.QtDBus.QDBusConnection.connect' called with wrong argument types:
        #PySide6.QtDBus.QDBusConnection.connect(str, str, str, str, method, str)
        conn.connect(service, path, iface, "NameOwnerChanged", self, "nameownerchangeslot")

    def nameownerchangeslot(self, arg:object) -> None:
        print(arg)
        pass

if __name__ == '__main__':
    print('Python {}.{}.{} {}'.format(sys.version_info[0], sys.version_info[1],
                                       sys.version_info[2], sys.platform))
    print(QLibraryInfo.build())
    app = QApplication(sys.argv)
    window = MainWindow()
    window.setWindowTitle(qVersion())
    window.resize(800, 480)
    window.show()
    sys.exit(app.exec())

This is the output:

Python 3.10.12 linux
Qt 6.6.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 10.3.1 20210422 (Red Hat 10.3.1-1)) [Python limited API 3.10.12]
qt.dbus.integration: Could not connect "org.freedesktop.DBus" to ameownerchangeslot :

The receiver is defined as QObject and the slot as a str, on a normal python signal connect, this is simply an object.

You see also if i pass the method as argument it is complaining that it is not on object, but also on a normal python signal connect, the argument is also defined as object and giving the method works...

I also tried an external package like sdbus, but this needs the asyncio package to listen for signals. I also configured PySide to use the asyncio loop, but the event class hasn't implemented the file watchers and socket connections, so this doesn't work either...

Any help and clarification is appreciated!

Best regards
Matthias Nacke

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