device.py 文件源码

def accessory_product_types(self):
        """
        List[str]: Indicates the model names of accessories connected to
            the device. Each list element corresponds to a connector.
            For example, index 0 corresponds to connector 0. The list
            contains an empty string for each connector with no
            accessory connected.
        """
        cfunc = lib_importer.windll.DAQmxGetDevAccessoryProductTypes
        if cfunc.argtypes is None:
            with cfunc.arglock:
                if cfunc.argtypes is None:
                    cfunc.argtypes = [
                        ctypes_byte_str, ctypes.c_char_p, ctypes.c_uint]

        temp_size = 0
        while True:
            val = ctypes.create_string_buffer(temp_size)

            size_or_code = cfunc(
                self._name, val, temp_size)

            if is_string_buffer_too_small(size_or_code):
                # Buffer size must have changed between calls; check again.
                temp_size = 0
            elif size_or_code > 0 and temp_size == 0:
                # Buffer size obtained, use to retrieve data.
                temp_size = size_or_code
            else:
                break

        check_for_error(size_or_code)

        return unflatten_channel_string(val.value.decode('ascii'))