const GVariantType* get_action_parameter_type ( GActionGroup* action_group, const gchar* action_name )
Queries the type of the parameter that must be given when activating
the named action within
When activating the action using g_action_group_activate_action(),
GVariant given to that function must be of the type returned
by this function.
In the case that this function returns
NULL, you must not give any
The parameter type of a particular action will never change but it is possible for an action to be removed and for a new action to be added with the same name but a different parameter type.
The name of the action to query.
|The data is owned by the caller of the function.|
|The value is a NUL terminated UTF-8 string.|
The parameter type.
|The data is owned by the called function.|
|The return value can be |