WINBIO_PRESENCE_CHANGE Constants

Describes the types of changes that can occur when the Windows Biometric Framework monitors the presence of individuals.

Constant/value	Description
WINBIO_PRESENCE_CHANGE_TYPE_UNKNOWN 0	The type of event is unknown. This value is used for the uninitialized structure.
WINBIO_PRESENCE_CHANGE_TYPE_UPDATE_ALL 1	Provides information about all of the faces current in the camera frame.
WINBIO_PRESENCE_CHANGE_TYPE_ARRIVE 2	A new face entered the camera frame.
WINBIO_PRESENCE_CHANGE_TYPE_RECOGNIZE 3	A face was matched to an enrolled user.
WINBIO_PRESENCE_CHANGE_TYPE_DEPART 4	A previously detected face has been out of the camera frame for a period of time.
WINBIO_PRESENCE_CHANGE_TYPE_TRACK 5	Provides updates information about the bounding box and reject detail values for a subset of the faces that are currently in the camera frame.

Requirements

Requirement	Value
Minimum supported client	Windows 10 [desktop apps only]
Minimum supported server	Windows Server 2016 [desktop apps only]
Header	Winbio_types.h (include Winbio.h for client applications or Winbio_adapters.h for adapters)