I think I'm right here, but I'm not confident I'm way off base.
The way I see this, there is only one interface to find, so the
interfaces iterator does not find the alts. The alts are mutually
exclusive, so the interface can only exist in the state of one of the
alts at once. The interface iterator finds interfaces which exist,
not interface which could potentially exist (which are just entries
in a descriptor).
When the device is configured (SetConfiguration is called for the
device) the interfaces are instantiated and can then be found by an
iterator. Initially the interface is in the default state, which is
as described by alt zero. Once a driver has found the interface, it
can then discover what alts are available and configure it to which
ever alt it wants using SetAlternateInterface.
So iterate to find an interface which looks interestig, the use
SetAlternateInterface.
--
Barry Twycross
email@hidden
---
USB, it's not a Dyslexic BUS. (Thanks to TC.)
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