[DllImport("setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern Boolean SetupDiEnumDeviceInterfaces(
           IntPtr hDevInfo,
           ref SP_DEVINFO_DATA devInfo,
           ref Guid interfaceClassGuid,
           Int32 memberIndex,
           ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData
        );

        HidD_GetHidGuid(HidInterfaceGuid)
 
        IdevInfoSet = SetupDiGetClassDevs(HidInterfaceGuid, Nothing, Nothing, _
          DIGCF_PRESENT Or DIGCF_DEVICEINTERFACE)
 
        didi.cbSize = Marshal.SizeOf(didi)
 
        iRet = SetupDiEnumDeviceInterfaces(IdevInfoSet, Nothing, _
          HidInterfaceGuid, 0, didi)