serialcli.py 文件源码

def read(self, size=1):
        """\
        Read size bytes from the serial port. If a timeout is set it may
        return less characters as requested. With no timeout it will block
        until the requested number of bytes is read.
        """
        if not self._port_handle:
            raise portNotOpenError
        # must use single byte reads as this is the only way to read
        # without applying encodings
        data = bytearray()
        while size:
            try:
                data.append(self._port_handle.ReadByte())
            except System.TimeoutException as e:
                break
            else:
                size -= 1
        return bytes(data)