Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Draw
HAIR_CONSTRAINTS_TAG_DRAW_ANCHOR
Parameter: Set
HAIR_CONSTRAINTS_TAG_SET_ANCHOR
Parameter: Release
HAIR_CONSTRAINTS_TAG_RELEASE_ANCHOR
Parameter: Clear
HAIR_CONSTRAINTS_TAG_CLEAR_ANCHOR
Parameter: Object
HAIR_CONSTRAINTS_TAG_ANCHOR_LINK
Parameter: Influence
HAIR_CONSTRAINTS_TAG_STRENGTH
Parameter: Offset
HAIR_CONSTRAINTS_TAG_OFFSET
Parameter: Influence Map
HAIR_CONSTRAINTS_TAG_STRENGTH_LINK
Parameter: Offset Map
HAIR_CONSTRAINTS_TAG_OFFSET_LINK