Subclassing and Hooking with Visual Basic

Name

Public Const WM_SYSKEYDOWN = &H104

Synopsis

wParam

Contains the virtual key code of the key pressed.

lParam

Contains bit flags for the key pressed. The bit flags are as follows:

0-15

Number of times the key is repeated

16-23

Scan code

24

Indicates if the key pressed is an extended key

25-28

Reserved

29

Always 0 for WM_SYSKEYDOWN messages

30

The previous key state; 1 if the key was already pressed before this message was posted, 0 otherwise

31

Always 1 for WM_SYSKEYDOWN messages

Description

Posted to a window indicating that a system key was pressed (a system key is the F10 key or one that is pressed while the ALT key is being pressed).

Return Value

0 only if the application processes this message.