USB Host Invalid Device Object Handle 

This constant defines an invalid USB Device Object Handle. The USB_HOST_DeviceGetFirst() and the USB_HOST_DeviceGetNext() functions return this value in the deviceObjHandle member of the USB_HOST_DEVICE_INFO object when there are no attached devices to report.

#define USB_HOST_DEVICE_OBJ_HANDLE_INVALID ((USB_HOST_DEVICE_OBJ_HANDLE)(-1))

None.