Trapping Wheel Mouse Roll Event -- An Esoteric Question

Is there a way for me to trap the event triggered when I roll the wheel of an optical wheel mouse?
Right now I am designing a program that is supposed to perform certain actions when the user rolls
the wheel of his mouse e.g. when zooming in or out of an AutoCAD drawing.

In AutoCAD it does not display anything in the command prompt when user rolls the wheel -- so it
is not actually an ordinary zoom -- it is something else .. zooming that is generated from a rolling
of the wheel is really a strange kind of zoom to me -- that I do not have an idea how to trap,
and yet I have to trap.

All kinds of ordinary zoom require somekind of click or drag using the mouse buttons accompanied
by a movement of the mouse itself -- but a zoom from a wheel of a mouse does not need any movement of the mouse at all -- it does not even require the user to click on any button -- it is
pure rolling of the wheel -- moreover, unlike ordinary zoom which sends something to the command
line (allowing user to simulate or trap it through code) a zooming accomplished by rolling the wheel
does not send anything in the command line at all.

Does anyone have an idea how it can be trapped? Any suggestion welcome.

Matt

 

winAPI...now we're programming..;0
google will give you more than you want. gl

 

Matt,
I use mouse.cls that came with the
book, VBA Developers Handbook.
Nice way to learn the api functions and
there in a useable class. Might
want to check it out.
gl,
Paul

 

there in a useable class. Might
they're....I hate doing that..;-)

 

You could check against the 'VIEWSIZE' & 'VIEWCTR' variables -- if they change you can revert to values you want.
HTH. - Lanny