Re: [Libusb-devel] libusb0.sys filter driver.

[Xiaofan C. <xia...@gm...>]

On Thu, Mar 17, 2011 at 10:55 PM, Xiaofan Chen <xia...@gm...> wrote:
> On Thu, Mar 17, 2011 at 10:13 PM, Graeme Gill <gr...@ar...> wrote:
>> Xiaofan Chen wrote:
>>> Ref: http://msdn.microsoft.com/en-us/library/ff540215%28v=vs.85%29.aspx
>>> "WinUSB/UMDF do not support the installation of kernel-mode drivers,
>>> such as filter drivers, as an overlying layer on the USB stack."
>>
>> That's strange. I recall that was able to get SnoopyPro tracing WinUSB OK.
>> That would seem to contradict the claim that WinUSB doesn't work with
>> filter drivers.
>
> I can get libusb-win32 filter working on top of WinUSB as well. I think
> this is a subtle point.
>
> I remember once I could find the conditions when the WDM filter will
> work on top of WinUSB/UMDF in MSDN. But I could not find it right
> now.

Okay, Google comes to the rescue again.
http://msdn.microsoft.com/en-us/library/ff561214(v=vs.85).aspx

I am not an expert here but you can see there are some
constraints if you want the kernel filter to work on top
of the UMDF driver.

> The following link says that it will not work other than some
> exceptional cases.
> http://www.osronline.com/showThread.CFM?link=118158
>



-- 
Xiaofan