Re: [Libusb-devel] libusb-1.0 Windows backend when WinUSB is a filter driver

[Pete B. <pb...@gm...>]

On 2010.08.18 00:54, Xiaofan Chen wrote:
> mcuee@WIN7HOMEX64_PC /d/work/libusb1win32/Test
> $ libusb-with-open
> 1d6b:0001 (bus 0, device 255)
> 046d:c058 (bus 0, device 1)
> 04d8:0204 (bus 0, device 3)
> -12:Operation not supported or unimplemented on this platform
> failed opening device 04d8:0204

Do you have the debug output on that?
Can you confirm that it actually chokes on "could not read class GUID 
for device"? As indicated from the comments, if all you're doing is test 
with WinUSB, you should be able to comment the 
SetupDiGetDeviceRegistryPropertyW(dev_info, &dev_info_data, 
SPDRP_CLASSGUID, section for testing. What happens when it's commented out?

Regards,

/Pete