GioActionget_parameter_type

const GVariantType*
g_action_get_parameter_type (
  GAction* action
)

Queries the type of the parameter that must be given when activating action.

When activating the action using g_action_activate(), the 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 GVariant, but NULL instead.

Available since:

2.28

Gets property Gio.Action:parameter-type

Returns:	`GVariantType`
	The parameter type.
	The data is owned by the instance.
	The return value can be `NULL`.