device filtering support

[Travis]

On 2/4/2012 6:23 AM, Xiaofan Chen wrote:
> Actually I am just stating a fact and I have no strong opinion of using
> libusb.dll and libusbK.dll along with libusbx Windows backend. In fact,
> I am fine with Graeme's existing approach of directly talking to libusb0.sys
> and I am certainly fine if you choose that approach and directly talk to
> libusbK.sys as well. In that case, no extra alls are needed for libusbx.

Ironically Graeme's implementation is by far they best for 
libusb-1.0(X).  It used direct driver comms so it was fast as hell with 
no dependencies.  It enumerated by pulling device descriptors using the 
original libusb-win32 methods.  His libusb-win32 codes would have worked 
out-of-the-box with libusbK as "K" must implement that same IO controls 
to stay compatible with the libusb0.dll.

Regards,
Travis