How to use the libusb1.libusb_get_string_descriptor function in libusb1

def getSupportedLanguageList(self):
        """
        Return a list of USB language identifiers (as integers) supported by
        current device for its string descriptors.

        Note: language identifiers seem (I didn't check them all...) very
        similar to windows language identifiers, so you may want to use
        locales.windows_locale to get an rfc3066 representation. The 5 standard
        HID language codes are missing though.
        """
        descriptor_string = create_binary_buffer(STRING_LENGTH)
        result = libusb1.libusb_get_string_descriptor(
            self.__handle, 0, 0, descriptor_string, sizeof(descriptor_string),
        )
        # pylint: disable=undefined-variable
        if result == ERROR_PIPE:
            # pylint: enable=undefined-variable
            # From libusb_control_transfer doc:
            # control request not supported by the device
            return []
        mayRaiseUSBError(result)
        length = cast(descriptor_string, POINTER(c_ubyte))[0]
        langid_list = cast(descriptor_string, POINTER(c_uint16))
        result = []
        append = result.append
        for offset in xrange(1, length / 2):
            append(libusb1.libusb_le16_to_cpu(langid_list[offset]))
        return result

def getStringDescriptor(self, descriptor, lang_id):
        """
        Fetch description string for given descriptor and in given language.
        Use getSupportedLanguageList to know which languages are available.
        Return value is an unicode string.
        Return None if there is no such descriptor on device.
        """
        descriptor_string = create_binary_buffer(STRING_LENGTH)
        try:
            mayRaiseUSBError(libusb1.libusb_get_string_descriptor(
                self.__handle, descriptor, lang_id, descriptor_string,
                sizeof(descriptor_string),
            ))
        # pylint: disable=undefined-variable
        except USBErrorNotFound:
            # pylint: enable=undefined-variable
            return None
        return descriptor_string.value.decode('UTF-16-LE')

def getSupportedLanguageList(self):
        """
        Return a list of USB language identifiers (as integers) supported by
        current device for its string descriptors.
        """
        descriptor_string = create_binary_buffer(STRING_LENGTH)
        result = libusb1.libusb_get_string_descriptor(self.__handle,
            0, 0, descriptor_string, sizeof(descriptor_string))
        if result < 0:
            if result == libusb1.LIBUSB_ERROR_PIPE:
                # From libusb_control_transfer doc:
                # control request not supported by the device
                return []
            raise libusb1.USBError(result)
        length = cast(descriptor_string, POINTER(c_ubyte))[0]
        langid_list = cast(descriptor_string, POINTER(c_uint16))
        result = []
        append = result.append
        for offset in xrange(1, length / 2):
            append(libusb1.libusb_le16_to_cpu(langid_list[offset]))
        return result

def getSupportedLanguageList(self):
        """
        Return a list of USB language identifiers (as integers) supported by
        current device for its string descriptors.
        """
        descriptor_string = create_binary_buffer(STRING_LENGTH)
        result = libusb1.libusb_get_string_descriptor(self.__handle,
            0, 0, descriptor_string, sizeof(descriptor_string))
        if result < 0:
            if result == libusb1.LIBUSB_ERROR_PIPE:
                # From libusb_control_transfer doc:
                # control request not supported by the device
                return []
            raise libusb1.USBError(result)
        length = cast(descriptor_string, POINTER(c_ubyte))[0]
        langid_list = cast(descriptor_string, POINTER(c_uint16))
        result = []
        append = result.append
        for offset in xrange(1, length / 2):
            append(libusb1.libusb_le16_to_cpu(langid_list[offset]))
        return result

def getStringDescriptor(self, descriptor, lang_id):
        """
        Fetch description string for given descriptor and in given language.
        Use getSupportedLanguageList to know which languages are available.
        Return value is an unicode string.
        Return None if there is no such descriptor on device.
        """
        descriptor_string = create_unicode_buffer(
            STRING_LENGTH / sizeof(c_wchar))
        result = libusb1.libusb_get_string_descriptor(self.__handle,
            descriptor, lang_id, descriptor_string, sizeof(descriptor_string))
        if result == libusb1.LIBUSB_ERROR_NOT_FOUND:
            return None
        if result < 0:
            raise libusb1.USBError(result)
        return descriptor_string.value

def getStringDescriptor(self, descriptor, lang_id):
        """
        Fetch description string for given descriptor and in given language.
        Use getSupportedLanguageList to know which languages are available.
        Return value is an unicode string.
        Return None if there is no such descriptor on device.
        """
        descriptor_string = create_unicode_buffer(
            STRING_LENGTH / sizeof(c_wchar))
        result = libusb1.libusb_get_string_descriptor(self.__handle,
            descriptor, lang_id, descriptor_string, sizeof(descriptor_string))
        if result == libusb1.LIBUSB_ERROR_NOT_FOUND:
            return None
        if result < 0:
            raise libusb1.USBError(result)
        return descriptor_string.value