Getting keystate in MouseProc hook proc

[Narc99]

In a MouseProc hook procedure, the WPARAM specifies the mouse message and
the LPARAM points to a MOUSEHOOKSTRUCT. There is a member of this structure
called dwExtraInfo, which does not seem to be well-documented. What
information does it contain or point to? In particular, is there a way to
get the keystate (MK_CONTROL, MK_LBUTTON, etc) from this member?

[nico]

"Narc99" <noe...@nowhere.com> wrote in message
news:gqbhd9$r2g$1...@aioe.org...

You don't need dwExtraInfo (driver information)
WPARAM is sufficient to know which button is down (WM_LBUTTONDOWN,
WM_RBUTTONDOWN, WM_MBUTTONDOWN,..)

[Narc99]

"nico" <ni...@jike.com> wrote in message
news:gqc75q$ieq$1...@news.motzarella.org...

That does not seem to be correct.

MouseProc has three parameters:
nCode: Hook procedure code
wParam: Mouse message identifier
lParam: Pointer to MOUSEHOOKSTRUCT

The MOUSEHOOKSTRUCT contains:
pt: POINT struct containing cursor position
hwnd: hwnd of window that will receive the msg
wHitTestCode: hit-test value
dwExtraInfo: "extra information"

Therefore, since the key-state (i.e., whether the control
or shift key, etc., is pressed) is no where to be found, I
was wondering if the dwExtraInfo member might contain
it or point to it, or in general how one would obtain that
information.

[Scott Seligman]

"Narc99" <noe...@nowhere.com> wrote:
>Therefore, since the key-state (i.e., whether the control
>or shift key, etc., is pressed) is no where to be found, I
>was wondering if the dwExtraInfo member might contain
>it or point to it, or in general how one would obtain that
>information.

Use GetKeyState() to get key state.

--
--------- Scott Seligman <scott at <firstname> and michelle dot net> ---------
An old friend of mine once quoted me an ancient Egyptian blessing:
'God be between you and harm in all the empty places where you must
walk.' -- Sheridan in Babylon 5:"A Distant Star"