KEYBOARD_INPUT_DATA structure (ntddkbd.h)

KEYBOARD_INPUT_DATA contains one packet of keyboard input data.

Syntax

typedef struct _KEYBOARD_INPUT_DATA {
  USHORT UnitId;
  USHORT MakeCode;
  USHORT Flags;
  USHORT Reserved;
  ULONG  ExtraInformation;
} KEYBOARD_INPUT_DATA, *PKEYBOARD_INPUT_DATA;

Members

UnitId

Specifies the unit number of a keyboard device. A keyboard device name has the format \Device\KeyboardPortN, where the suffix N is the unit number of the device. For example, a device, whose name is \Device\KeyboardPort0, has a unit number of zero, and a device, whose name is \Device\KeyboardPort1, has a unit number of one.

MakeCode

Specifies the scan code associated with a key press.

Flags

Specifies a bitwise OR of one or more of the following flags that indicate whether a key was pressed or released, and other miscellaneous information.

Value	Meaning
KEY_MAKE	The key was pressed.
KEY_BREAK	The key was released.
KEY_E0	Extended scan code used to indicate special keyboard functions.
KEY_E1	Extended scan code used to indicate special keyboard functions.

Reserved

Reserved for operating system use.

ExtraInformation

Specifies device-specific information associated with a keyboard event.

Remarks

In response to an IRP_MJ_READ (Kbdclass) request, Kbdclass transfers zero or more KEYBOARD_INPUT_DATA structures from its internal data queue to the Win32 subsystem buffer.

Requirements

Requirement	Value
Header	ntddkbd.h (include Ntddkbd.h)

See also

IRP_MJ_READ (Kbdclass)

KeyboardClassServiceCallback