CopyDeviceDescriptor
Returns the device descriptor.
Declaration
virtual const IOUSBDeviceDescriptor * CopyDeviceDescriptor();Return Value
A pointer to the device descriptor, or NULL if the service is terminating. It’s your responsibility to free the returned descriptor.
Discussion
This method searches the descriptor cache for the specified descriptor. If the descriptor isn’t in the cache, the method retrieves it from the device using a GET_DESCRIPTOR control request (USB 2.0, section 9.4.3) and adds it to the cache. When making a GET_DESCRIPTOR control request, this method acquires the service’s workloop lock and may call commandSleep.