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KBDLLHOOKSTRUCT info  Overview  Group

[New for Windows NT 4.0 Service Pack 3.]

The KBDLLHOOKSTRUCT structure contains information about a low-level keyboard input event.

typedef struct tagKBDLLHOOKSTRUCT {

    DWORD vkCode;      // virtual key code

    DWORD scanCode;    // scan code

    DWORD flags;       // flags

    DWORD time;        // time stamp for this message

    DWORD dwExtraInfo; // extra info from the driver or keybd_event

} KBDLLHOOKSTRUCT, FAR *LPKBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;

 

Members

vkCode
Specifies a virtual-key code. The code must be a value in the range 1 to 254.
scanCode
Specifies a hardware scan code for the key.
flags
Specifies the extended-key flag, event-injected flag, context code, and transition-state flag.

  Value

Description

0

Specifies whether the key is an extended key, such as a function key or a key on the numeric keypad. The value is 1 if the key is an extended key; otherwise, it is 0.

1-3

Reserved.

4

Specifies whether the event was injected. The value is 1 if the event was injected; otherwise, it is 0.

5

Specifies the context code. The value is 1 if the ALT key is pressed; otherwise, it is 0.

6

Reserved.

7

Specifies the transition state. The value is 0 if the key is pressed and 1 if it is being released.

An application can use the following values to test the keystroke flags:

Value

Purpose

LLKHF_EXTENDED

Test the extended-key flag.

LLKHF_INJECTED

Test the event-injected flag.

LLKHF_ALTDOWN

Test the context code.

LLKHF_UP

Test the transition-state flag.

time
Specifies the time stamp for this message.
dwExtraInfo
Specifies extra information associated with the message.

See Also

LowLevelKeyboardProc, SetWindowsHookEx

See also:


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