Queries the current state of
If the action is not stateful then
NULL will be returned. If the
action is stateful then the type of the return value is the type
given by g_action_get_state_type().
The return value (if non-
NULL) should be freed with
g_variant_unref() when it is no longer required.
The current state of the action.
|The caller of the method takes ownership of the data, and is responsible for freeing it.|
|The return value can be |