the unique bus name for the destination for the signal or null to emit to all listeners
path of remote object
D-Bus interface to emit a signal on
the name of the signal to emit
a #GVariant tuple with parameters for the signal or null if not passing parameters
true unless error is set
Emits a signal.
If the parameters GVariant is floating, it is consumed.
This can only fail if parameters is not compatible with the D-Bus protocol (gio.types.IOErrorEnum.InvalidArgument), or if connection has been closed (gio.types.IOErrorEnum.Closed).