Another problem I'm having with the HID functions is that
IOHIDDeviceCopyValueMultiple always returns kIOReturnError. I can use
IOHIDDeviceGetValue successfully, but IOHIDDeviceCopyValueMultiple is
supposed to be more efficient if you want to get a bunch of values at once.
I downloaded some IOKit source code and found that the kIOReturnError
error is being returned by a call to IOHIDTransactionCommit internal to
IOHIDDeviceCopyValueMultiple, but that doesn't clear things up.
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