Hi Wander,
I ran with PYUSB_DEBUG=debug and encountered the error. The log text when
the error occurred is here:
http://pastebin.com/kmqSrek9
Its the pyusb debug log intermingled with my program's logging information
as well. The first "Access Denied" error occurs at line 1527. There are
also a bunch '[Errno 10060] Operation timed out' errors that occur leading
up to the access denied error. Just looking at the pyusb log messages
around the time the errors are reported by my program, I didn't see
anything that looked relevant...
Richard
Date: Thu, 13 Nov 2014 09:54:31 -0200
From: Wander Lairson Costa <wander.lair...@gmail.com>
Subject: Re: [pyusb-users] Access Denied Error on Windows 7
To: pyusb-users <pyusb-users@lists.sourceforge.net>
Message-ID:
<CAFsSK4ZsCYbR8eQETrDrcU0QU+f_
05bKShpWgQdE6SA5K=5...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
2014-11-11 15:22 GMT-02:00 Richard Bryan <rabr...@lucidsci.com>:
> 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
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