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Feature Descriptors RRS feed

  • Question

  • I am working on handling Ms OS Descriptors on my KMDF bus driver on win 8.1 64 bit and win 10 64 bit beta. The driver is getting the URB_FUNCTION_GET_MS_FEATURE_DESCRIPTOR request but the wLength field is some invalid junk value instead of 0x0010 which is the size of compatible id descriptor header. In my case , the value is something like 0xFFFF8710. How could this be? This request is obtained by default in driver.

    I see that the wLength is the expected value on Win 8 64 bit!!

    • Edited by its_me_here Saturday, July 18, 2015 1:42 PM
    Friday, July 17, 2015 1:55 AM