g-action-parameter-type (object)

object -- a g-action object
vtype -- the g-variant-type parameter type

Accessor of the parameter-type slot of the g-action class.

Queries the type of the parameter that must be given when activating the action. When activating the action using the g-action-activate function, the g-variant parameter given to that function must be of the type returned by this function.

In the case that this function returns a nil value, you must not give any g-variant parameter, but a null-pointer instead.