KbFilter_ServiceCallback routine

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

Syntax


VOID KbFilter_ServiceCallback(
  _In_    PDEVICE_OBJECT       DeviceObject,
  _In_    PKEYBOARD_INPUT_DATA InputDataStart,
  _In_    PKEYBOARD_INPUT_DATA InputDataEnd,
  _Inout_ PULONG               InputDataConsumed
);

Parameters

DeviceObject [in]

Pointer to the class device object.

InputDataStart [in]

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

InputDataEnd [in]

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

InputDataConsumed [in, out]

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

Return value

None

Remarks

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.

Requirements

Target platform

Desktop

Header

Kbfiltr.h (include Kbfiltr.h)

IRQL

DISPATCH_LEVEL

See also

KeyboardClassServiceCallback
KEYBOARD_INPUT_DATA

 

 

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