// ntdd8042.h

typedef enum _KEYBOARD_SCAN_STATE {
  Normal,
  GotE0,
  GotE1
} KEYBOARD_SCAN_STATE, *PKEYBOARD_SCAN_STATE;
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Windows Driver Kit DDI reference (ne-ntdd8042-_keyboard_scan_state)

_KEYBOARD_SCAN_STATE enumeration

Description

The KEYBOARD_SCAN_STATE enumeration type indicates the scan state of an input byte from a keyboard.

Constants

`Normal`

Indicates that the current byte is a Normal scan code (a nonextended code).

`GotE0`

Indicates that the current byte is an E0 extended scan code.

`GotE1`

Indicates that the current byte is an E1 extended scan code.

Remarks

This enumeration type is used as input to an optional KbFilter_IsrHook routine, which can be supplied by a vendor-supplied keyboard filter driver.

KEYBOARD_SCAN_STATE - NtDoc