Hello. I'm designing device arrival/departure notification routines for my
HID device, and since any number of devices could be attached to the host, I
need a way to differentiate between devices in my departure notification.
Say if 3 devices were present, and their context stored away, I need to know
which one of the 3 devices had departed, so I can clean up its context. In
other words, I need a property which uniquely identifies each device.
Unfortunately, there is no unique serial number for each device. I observed
that kIOHIDLocationIDKey is unique for each device. But what does this
property mean? Is it guaranteed to be unique for each device, no matter
what the topology?
thanks,
Philip Lukidis
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