KbFilter_ServiceCallback

The KbFilter_ServiceCallback routine is a template for a filter service callback routine that supplements the operation of KeyboardClassServiceCallback.

VOID
  KbFilter_ServiceCallback(
    IN PDEVICE_OBJECT  DeviceObject,
    IN PKEYBOARD_INPUT_DATA  InputDataStart,
    IN PKEYBOARD_INPUT_DATA  InputDataEnd,
    IN OUT PULONG  InputDataConsumed
    );

Parameters

DeviceObject

Pointer to the class device object.

InputDataStart

Pointer to the first keyboard input data packet in the input data buffer of the port device.

InputDataEnd

Pointer to the keyboard input data packet that immediately follows the last data packet in the input data buffer of the port device.

InputDataConsumed

Pointer to the number of keyboard input data packets that are transferred by the routine.

Return Value

None

Headers

Declared in kbfiltr.h. Include kbfiltr.h.

Comments

The ISR dispatch completion routine of the function driver calls KbFilter_ServiceCallback, which then calls KeyboardClassServiceCallback. A vendor can implement a filter service callback to modify the input data that is transferred from the device's input buffer to the class data queue. For example, the callback can delete, transform, or insert data.

For more information about customizing the keyboard class service callback, see Connect a Class Service Callback and a Filter Service Callback to a Device.

KbFilter_ServiceCallback runs in kernel mode at IRQL DISPATCH_LEVEL.

See Also

KeyboardClassServiceCallback, KEYBOARD_INPUT_DATA