Detecting scrolling with a Magic Mouse using a CFCallback

Question

Can I find out how much a Magic Mouse has scrolled by in a IOHIDDeviceRegisterInputValueCallback function?

I am trying to detect the scrolling gesture from a Magic Mouse using the CFCallbacks. I have it working fine with a standard USB mouse with a scroll wheel, but it seems that the Magic Mouse reports scrolling in a different way.

Thanks.

Answer 1

I ended up getting the scroll information from the window event in Cocoa instead. Not a full fix for this issue but I still was able to access the scroll message.