Returns the number of pending CAN messages.

        :param int channel: CAN channel, to be used (:data:`Channel.CHANNEL_CH0` or :data:`Channel.CHANNEL_CH1`).
        :param int flags: Flags specifies which buffers should be checked (see enum :class:`PendingFlags`).
        :return: The number of pending messages.
        :rtype: int

def get_msg_pending(self, channel, flags):
        """
        Returns the number of pending CAN messages.

        :param int channel: CAN channel, to be used (:data:`Channel.CHANNEL_CH0` or :data:`Channel.CHANNEL_CH1`).
        :param int flags: Flags specifies which buffers should be checked (see enum :class:`PendingFlags`).
        :return: The number of pending messages.
        :rtype: int
        """
        count = DWORD(0)
        UcanGetMsgPending(self._handle, channel, flags, byref(count))
        return count.value