I ran into the same error using 1.0.12 -> 1.0.14. After reporting the
problem it was fixed.
Updating to a newer version will likely resolve the problem. Sorry I don't
recall the details of the fix.
On Tue, Feb 26, 2013 at 5:31 AM, Xiaofan Chen <xiaof...@gmail.com> wrote:
> On Tue, Feb 26, 2013 at 9:01 PM, Gert Franke <g.fra...@n-hands.de> wrote:
> > Hello,
> >
> > first I'd like to thank the libusbx developers for their work, in
> > particular for the excellent documentation.
> >
> > I am writing software for a custom USB device for Windows. The stable
> > version of this SW is using libusb-win32 and works fine (therefore I am
> > sure to use correct USB parameters). I want to try out libusbx/async
> > mode to increase performance. But I encountered a very basic problem
> > long before trying any async operation:
> >
> > After the standard device searching procedure and successfully opening
> > one device, usb_claim_interface fails with rc=-3 "access denied". This
> > is 100% reproducible. What does it mean and what can I do to avoid the
> > problem?
> >
> > Thank you for your help!
> >
> > Gert
> >
> > Some details on my environment:
> > OS: Win 7
> > Lib: libusbx 1.0.14
> > Driver: libusb0.sys 1.2.5.0 (tested with libusb-win32)
>
> Take note the latest version is 1.2.6.0. But the
> problem should not be this.
>
> Take note libusbx support of libusb0.sys is quite
> experimental with multiple issues.
> Ref: https://github.com/libusbx/libusbx/issues?sort=created&state=open
>
> So please try libusbx.git and try WinUSB or libusbk.sys
> to see if that helps.
>
> libusbx.git: https://github.com/libusbx/libusbx
>
> If you want to use your existing libusb-win32 application
> and the new libusbx program, then you should use
> libusbk.sys.
>
> --
> Xiaofan
>
>
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