Und schon ist die Antwort da. Von Walter Oney
dem Treiberexperten.
Leider ist die Antwort negativ. Es geht nicht.
Zitat:
Using what kind of system call? There is no single driver that's
guaranteed to be in every device stack above the function driver and
responding to IOCTL requests. I don't think there's any way to convert
an arbitrary file
handle into a SetupDiXxx info
handle in order to
query
the device properties. I think you are basically SOL here, which makes
sense because there's nothing about a
handle that ties it to the USB
bus.