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IOServiceGetMatchingServices() returning empty iterator

Hi,

I copied sample code directly from "Working With HID Class Device Interfaces". It did not work.

 hidMatchDictionary = IOServiceMatching(kIOHIDDeviceKey);
// produced a matching dictionary

ioReturnValue = IOServiceGetMatchingServices(masterPort, hidMatchDictionary, hidObjectIterator);
// returned empty iterator (with no error).

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
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