On Wednesday, March 27, 2002, at 12:13 PM, Anthony Melidy wrote:
Then I replaced kIOHIDDeviceKey with kIOUSBDeviceClassName and did get
an iterator with the new matching dictionary.
My mac has an Apple Keyboard and Apple Mouse. Are they both not HID
devices in OS X?
Should I not have obtained an iterator with 2 items in the first case?
Is there a problem with IOServiceGetMatchingServices()?
Any Ideas?
Anthony,
It turns out that on any shipping version of Mac OS X, the AppleUSBMouse
and the AppleUSBKeyboard drivers (objects) are NOT IOHIDDevice objects.
They ARE IOHIDevice objects (count the number of capital "D"s).
The difference is this.. There are actually two different hunks of code
in Mac OS X for dealing with HID devices. One is called IOHIDSystem, and
the other is IOHIDFamily.
IOHIDSystem is very specific to pointing devices and keyboards. It
implements the IOHIDevice class, as well as two subclasses -
IOHIPointing and IOHIKeyboard. AppleUSBKeyboard is a subclass of the
former and AppleUSBKeyboard is a subclass of the latter.
IOHIDFamily is the one which implements the IOHIDDevice class, which you
were looking for with the snippet of code you provided. We do have some
of these created - for example with the cube speakers - but not very
many at this time.
The "ioclasscount" command might help you sort this out.
Hope this helps.
Rhoads Hollowell
USB Software Team
Apple Computer, Inc.
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