Creates a new #GDBusMessage for a method call.
A valid D-Bus name or %NULL.
A valid object path.
A valid D-Bus interface name or %NULL.
A valid method name.
Return: A #GDBusMessage. Free with g_object_unref().
ConstructionException GTK+ fails to create the object.
2.26
See Implementation
Creates a new #GDBusMessage for a method call.