Inverting the mouse in windows

When my windows app is runnning (minimized) I want the mouse to be "inverted". When the mouse is moved up the pointer moves down and when the mouse is moved down the pointer goes up. But left and right will remain unchanged. Can anyone show me an example of how I can do this?
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mblatConnect With a Mentor Commented:
First of all if you app. is minimized you will not get any mouse messages, unless you will capture mouse input with SetCapture or TrackMouseEvent.  But then nobody else will receive them, so what is the point exactly?
Assuming that did get mouse input somehow, (let's say you've installed system hook) you need to handle WM_MOUSEMOVE message in you window.

In that event you need to compare new mouse position with old position (position of the mouse is passed as a parameter in message) and therefore detect if mouse moved up or down.

At this point you can call LoadCursor(....).  For standrad cursor you'll be able to use IDC_ARROW as a parameter, for "reversed arrow", you will need to create custom cursor.  Don't forget to free up resources, this function if poorely writen will eat up GDI resources in hurry.
kpnkpn-->  I have refunded 100 points to you for the other 3 items inadvertently created when you posted this question and closed them for you. 

Rather than using the browser controls (F5/Refresh or the back button), please use the Reload function of this application.  Also, hitting submit more than once can cause this problem as well.

Thanks to expert Triskelion, for bringing these to my attention so I could refund all of the above to you.

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