[libusb] Trouble Claiming / Opening multiple interfaces.

[Michael W. <mik...@gm...>]

Hello,

I am using libusb 1.0.20 (pulled the master from github on 6/26/2016)
with the WinUSB v6.1.7600.16385 drivers on Windows 10.  I am having
problems with libusb_claim_interface reporting
LIBUSB_ERROR_NOT_SUPPORTED whenever I try to claim an interface other
than 0.

The device I am working with is a U3V vision camera, and reports 3
interfaces grouped by an IAD.

The first interface (interface 0 with 1 bulk IN and 1 bulk OUT
endpoint) can be claimed and I have been using the associated
endpoints for some time now.   Whenever I try to claim  interface 1
(an event interface, with 1 bulk IN endpoint) or interface 2 (a data
stream interface, with 1 bulk IN endpoint), the
libusb_claim_interface() call fails with the mentioned error code.

Any attempts to use the bulk IN endpoints via submit_bulk_transfer
associated with the interfaces that fail to be claimed fail with
LIBUSB_ERROR_NOT_FOUND.

Any suggestions as to what I may be doing wrong or what to look for?

-Mike







-- 
Mike Williamson
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