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MouseHookStruct in VC++ 4.0 framework

Posted on 1997-07-21
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Last Modified: 2013-12-03
I need to get hold of the extra information dwExtraInfo in the current valid MOUSEHOOKSTRUCT in the Visual C++ application framework.  It's for a 3D input device (FreeD) and the extra info is the Z parameter.  How do i do this?  Unfortunately the examples as always have been provided for non-Visual C++ .  Thanks for any help.
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Question by:kingpie
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by:
belov earned 90 total points
ID: 1401524
If you just need to obtain recent MOUSEHOOKSTRUCT
dwExtraInfo value, there are two ways. First is
to install mouse hook procedure.
Write LRESULT CALLBACK MouseProc(int nCode,
WPARAM wParam,  LPARAM lParam )
function, and you will get pointer to MOUSEHOOKSTRUCT
in lParam. This procedure must behave like other hook
procedures, i.e. return CallNextHookEx if nCode < 0.
You must not perform complex actions in hook procedure,
so you may want to save dwExtraField for later use.
This function must be registered as active hook
calling SetWindowHookEx with WH_MOUSE hook type.
And you'd better place hook code in DLL library,
if you want to install it system-wide.
Don't forget to UnhookWindowsHookEx
when terminating your programm.

The second is simplier but may not work.
You may call GetMessageExtraInfo() function,
which returns extra information supplied
with the message. In normal conditions
it will be the same as dwExtraInfo field of
MOUSEHOOKSTRUCT, so you don't need
hook at all, and call it on mouse notification
messages.

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Author Comment

by:kingpie
ID: 1401525
Thank you, the second option GetMessageExtraInfo works perfectly.

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