How could a 'byte string' input argument be passed to a python function called from MATLAB ?

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Varun Pai 2019-3-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/453198-how-could-a-byte-string-input-argument-be-passed-to-a-python-function-called-from-matlab

评论： Varun Pai 2019-4-1

I am trying to create a server-client application using ipc, where server is a pure Python application and client is a MATLAB application which calls python functions. I have Anaconda installed with Python 3.7 environment.

Python Server code :

from multiprocessing.connection import Listener
address = ('localhost', 6000)     # family is deduced to be 'AF_INET'
listener = Listener(address, authkey=b'secret password')
conn = listener.accept()
print('connection accepted from', listener.last_accepted)
while True:
    msg = conn.recv()
    print(msg)
    if msg == 'close':
        conn.close()
        break
listener.close()

Python client code :

from multiprocessing.connection import Client
address = ('localhost', 6000)
conn = Client(address, authkey=b'secret password')
conn.send('close')
# can also send arbitrary objects:
# conn.send(['a', 2.5, None, int, sum])
conn.close()

When executed in Python, the above pair is working fine.

Now trying MATLAB equivalent of above Python client code in command line :

>> mp_pyModule = py.importlib.import_module('multiprocessing.connection');
>> client_fn = mp_pyModule.Client;
>> address = py.tuple({'localhost',int16(6000)});
>> conn = client_fn(address,pyargs('authkey','secret password'));
Error using connection>Client (line 495)
Python Error: TypeError: authkey should be a byte string