KBDLLHOOKSTRUCT structure (winuser.h)
Contains information about a low-level keyboard input event.
Syntax
typedef struct tagKBDLLHOOKSTRUCT {
DWORD vkCode;
DWORD scanCode;
DWORD flags;
DWORD time;
ULONG_PTR dwExtraInfo;
} KBDLLHOOKSTRUCT, *LPKBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;
Members
vkCode
Type: DWORD
A virtual-key code. The code must be a value in the range 1 to 254.
scanCode
Type: DWORD
A hardware scan code for the key.
flags
Type: DWORD
The extended-key flag, event-injected flags, context code, and transition-state flag. This member is specified as follows. An application can use the following values to test the keystroke flags. Testing LLKHF_INJECTED (bit 4) will tell you whether the event was injected. If it was, then testing LLKHF_LOWER_IL_INJECTED (bit 1) will tell you whether or not the event was injected from a process running at lower integrity level.
The following table describes the layout of this value.
| Bits | 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 | Specifies whether the event was injected from a process running at lower integrity level. The value is 1 if that is the case; otherwise, it is 0. Note that bit 4 is also set whenever bit 1 is set. |
| 2-3 | Reserved. |
| 4 | Specifies whether the event was injected. The value is 1 if that is the case; otherwise, it is 0. Note that bit 1 is not necessarily set when bit 4 is set. |
| 5 | The context code. The value is 1 if the ALT key is pressed; otherwise, it is 0. |
| 6 | Reserved. |
| 7 | The transition state. The value is 0 if the key is pressed and 1 if it is being released. |
time
Type: DWORD
The time stamp for this message, equivalent to what GetMessageTime would return for this message.
dwExtraInfo
Type: ULONG_PTR
Additional information associated with the message.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Header | winuser.h (include Windows.h) |
See also
Conceptual
Reference