Re: [pyusb-users] Access Denied Error on Windows 7

[Wander L. C. <wan...@gm...>]

2014-11-11 15:22 GMT-02:00 Richard Bryan <ra...@lu...>:
> I'm frequently running into an "Access Denied (insufficient permissions)"
> errors on Windows 7 (with libusb1 backend) during long-running usb sessions
> with a device.  When this happens, I call reset() and dispose_resources() on
> the usb handle and then attempt to reenumerate it using usb.core.find(), but
> the Access Denied error keeps occurring until I unplug and replug the
> device.  Restarting the program alone doesnt fix it.
>

iirc, libusb reset operation is problematic under Windows, so better
to avoid it.

> I have a multithreaded program, but interaction with pyusb is only ever done
> in the same, single thread.
>

This should not cause problems...

> Anyone have any ideas what's going on?  Or is this something I should ask
> the libusb list about?
>

Could you please run you program with the environment variable
PYUSB_DEBUG=debug defined and report the logs?

> Richard
>
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-- 
Best Regards,
Wander Lairson Costa