SetupDiEnumDeviceInterfaces() fail

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Hi,

I want to find the PID and VID of USB device using
SetupDiEnumDeviceInterfaces() and my USB device attached with the USB 2.0
adpater card. The SetupDiEnumDeviceInterfaces() always return fail. However,
it returns true if the same device attached with the motherboard's USB port.
The GUID I used was {A5DCBF10-6530-11D2-901F-00C04FB951ED}.

Anyone know what the problem is??

Many Thanks.

William


.

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