/tmp/snapshot-pyside-6.2-rel/pyside-setup/examples/dbus/pingpong

(You can also check this code in the repository)

ping.py

"""PySide6 port of the QtDBus pingpong example from Qt v6.x (ping client)"""

import sys
from PySide6.QtCore import QCoreApplication, QObject, Slot
from PySide6.QtDBus import QDBusConnection,  QDBusInterface, QDBusReply


SERVICE_NAME = 'org.example.QtDBus.PingExample'


if __name__ == "__main__":
    app = QCoreApplication()
    session_bus = QDBusConnection.sessionBus()
    if not session_bus.isConnected():
        print("Cannot connect to the D-Bus session bus.\n"
              "To start it, run:\n"
              "\teval `dbus-launch --auto-syntax`\n")
        sys.exit(-1)

    iface = QDBusInterface(SERVICE_NAME, '/', '', session_bus)
    if not iface.isValid():
        print(session_bus.lastError().message())
        sys.exit(-1)

    argument = sys.argv[1] if len(sys.argv) > 1 else 'Hello'
    message = iface.call('ping', argument)
    reply = QDBusReply(message)
    if not reply.isValid():
        error = reply.error().message()
        print(f'ping: Call failed: {error}')
        sys.exit(-1)

    value = reply.value()
    print(f'ping: Reply was: {value}')
    sys.exit(0)

pong.py

"""PySide6 port of the QtDBus pingpong example from Qt v6.x (pong server)"""

import sys
from PySide6.QtCore import QCoreApplication, QObject, Slot
from PySide6.QtDBus import QDBusConnection


SERVICE_NAME = "org.example.QtDBus.PingExample"


class Pong(QObject):
    def __init__(self, parent=None):
        super().__init__(parent)

    @Slot(str, result=str)
    def ping(self, arg):
        print(f'pong: Received ping({arg})')
        qApp.quit()
        return f'ping("{arg}") got called'


if __name__ == "__main__":
    app = QCoreApplication()
    session_bus = QDBusConnection.sessionBus()
    if not session_bus.isConnected():
        print("Cannot connect to the D-Bus session bus.\n"
              "To start it, run:\n"
              "\teval `dbus-launch --auto-syntax`\n")
        sys.exit(-1)

    if not session_bus.registerService(SERVICE_NAME):
        print(session_bus.lastError().message())
        sys.exit(-1)

    pong = Pong()
    session_bus.registerObject('/', pong, QDBusConnection.ExportAllSlots)

    print(f'pong: {SERVICE_NAME} running. Now start ping.py')
    exit_code = app.exec()
    print('pong: terminating')
    sys.exit(exit_code)