WINBIO_PIPELINE structure (winbio_adapter.h)

The WINBIO_PIPELINE structure contains shared context information used by the sensor, engine, and storage adapter components in a single biometric unit.

Syntax

typedef struct _WINBIO_PIPELINE {
  HANDLE                      SensorHandle;
  HANDLE                      EngineHandle;
  HANDLE                      StorageHandle;
  PWINBIO_SENSOR_INTERFACE    SensorInterface;
  PWINBIO_ENGINE_INTERFACE    EngineInterface;
  PWINBIO_STORAGE_INTERFACE   StorageInterface;
  PWINIBIO_SENSOR_CONTEXT     SensorContext;
  PWINIBIO_ENGINE_CONTEXT     EngineContext;
  PWINIBIO_STORAGE_CONTEXT    StorageContext;
  PWINBIO_FRAMEWORK_INTERFACE FrameworkInterface;
} WINBIO_PIPELINE, *PWINBIO_PIPELINE;

Members

SensorHandle

File handle to the sensor device associated with the biometric unit. Adapters should treat this as a read-only field.

EngineHandle

File handle to the dedicated hardware matching engine, if one is present. This is modified only by the engine adapter. It is read by the Windows Biometric Framework.

StorageHandle

File handle to the template storage database. This is read by the Windows Biometric Framework, but it is modified only by the storage adapter.

SensorInterface

Pointer to the WINBIO_SENSOR_INTERFACE structure for the biometric unit. Adapters should ignore this field.

EngineInterface

Pointer to the WINBIO_ENGINE_INTERFACE structure for the biometric unit. Adapters should ignore this field.

StorageInterface

Pointer to the WINBIO_STORAGE_INTERFACE structure for the biometric unit. Adapters should ignore this field.

SensorContext

Pointer to a private data structure defined by the sensor adapter. This pointer and the structure contents are managed by the sensor adapter and are never accessed by the Windows Biometric Framework.

EngineContext

Pointer to a private data structure defined by the engine adapter. This pointer and the structure contents are managed by the engine adapter and are never accessed by the Windows Biometric Framework.

StorageContext

Pointer to a private data structure defined by the storage adapter. This pointer and the structure contents are managed by the storage adapter and are never accessed by the Windows Biometric Framework.

FrameworkInterface

Remarks

Each biometric unit has its own unique WINBIO_PIPELINE structure to maintain the current processing state of operations performed by the biometric unit. The Windows Biometric Framework automatically passes the address of the pipeline structure to each adapter in the component stack. Adapters use this pipeline pointer to access their own private context data and to call functions in lower levels of the component stack.

Requirements

See also

Plug-in Functions

Plug-in Structures