PySide6.QtDBus.QDBusInterface

class QDBusInterface

The QDBusInterface class is a proxy for interfaces on remote objects.

Details

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

QDBusInterface is a generic accessor class that is used to place calls to remote objects, connect to signals exported by remote objects and get/set the value of remote properties. This class is useful for dynamic access to remote objects: that is, when you do not have a generated code that represents the remote interface.

Calls are usually placed by using the call() function, which constructs the message, sends it over the bus, waits for the reply and decodes the reply. Signals are connected to by using the normal QObject::connect() function. Finally, properties are accessed using the QObject::property() and QObject::setProperty() functions.

The following code snippet demonstrates how to perform a mathematical operation of "2 + 2" in a remote application called com.example.Calculator, accessed via the session bus.

QDBusInterface remoteApp( "com.example.Calculator", "/Calculator/Operations",
                          "org.mathematics.RPNCalculator" )
remoteApp.call( "PushOperand", 2 )
remoteApp.call( "PushOperand", 2 )
remoteApp.call( "ExecuteOperation", "+" )
reply = remoteApp.call( "PopOperand" )
if reply.isValid():
    printf( "%d", reply.value() ) # prints 4

See also

Qt D-Bus XML compiler (qdbusxml2cpp)

Python Language Note

DBus signals can be captured with string-based connections (see Specifying Signals and Slots by Method Signature Strings).

Synopsis

Methods

• def __init__()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

__init__(service, path[, interface=""[, connection=QDBusConnection.sessionBus()[, parent=None]]])

Parameters:

• service – str

• path – str

• interface – str

• connection – QDBusConnection

• parent – QObject

Creates a dynamic QDBusInterface object associated with the interface interface on object at path path on service service, using the given connection. If interface is an empty string, the object created will refer to the merging of all interfaces found by introspecting that object. Otherwise if interface is not empty, the QDBusInterface object will be cached to speedup further creations of the same interface.

parent is passed to the base class constructor.

If the remote service service is not present or if an error occurs trying to obtain the description of the remote interface interface, the object created will not be valid (see isValid() ).