General Constants (Winbio_types.h)

The following constants are used throughout the Windows Biometric Framework.

Constant/value	Description
SECURITY_MAX_SID_SIZE	The maximum length of a security identifier (SID) value. Currently this is 68.
WINBIO_UNIT_ID	ID number of a biometric unit.
WINBIO_SESSION_HANDLE	An unsigned long integer that contains the handle for an open biometric session.
WINBIO_FRAMEWORK_HANDLE	An unsigned long integer that contains the handle for an open framework session.
WINBIO_UUID	A GUID.
WINBIO_STRING	A byte array that contains a null-terminated Unicode string.
WINBIO_MAX_STRING_LEN	The maximum length of a WINBIO_STRING value. Currently this is 256.
WINBIO_MAX_SAMPLE_BUFFER_SIZE 0x7FFFFFFF	The maximum number of bytes in a single biometric data capture.

Requirements

Requirement	Value
Minimum supported client	Windows 7 [desktop apps only]
Minimum supported server	Windows Server 2008 R2 [desktop apps only]
Header	Winbio_types.h (include Winbio.h)