Подскажите пожалуйста какие сообщения генерит колесико мыши.

WM_MOUSEWHEEL

wParam The low-order word indicates whether various virtual keys are down. This parameter can be one or more of the following values. Value Description MK_CONTROL The CTRL key is down.
MK_LBUTTON The left mouse button is down.
MK_MBUTTON The middle mouse button is down.
MK_RBUTTON The right mouse button is down.
MK_SHIFT The SHIFT key is down.
MK_XBUTTON1 Windows 2000: The first X button is down.
MK_XBUTTON2 Windows 2000: The second X button is down.

А MSDN вообще в онлайне - http://msdn.microsoft.com/library/

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