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Defining callback function for methods called from python (pika library)

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Ran Shaham
Ran Shaham 2022-11-13
回答： Abhijeet 2023-8-30
Hello,
I am trying to use the "py.*" functionality in matlab.
I am calling the pika library to connect and consume from a RabbitMQ Server.
While the following code does work:
channel = connection.channel();
channel.queue_declare(queue='hello');
channel.basic_publish(exchange='exchangename', routing_key='key.name', body='somemessage',properties=py.pika.BasicProperties(reply_to='hello'))
connection.close();
The other part does not work:
connection_r = py.pika.BlockingConnection(py.pika.ConnectionParameters(host='localhost'));
channel_r = connection_r.channel();
channel_r.queue_declare(queue='hello');
channel_r.basic_consume(queue='hello', auto_ack=true,on_message_callback= @Callbackfunction);
channel_r.start_consuming()
I get erros saying that i can't send MATLAB functions in to the python env. And i also can't just define the functions there because it does not work.
Is there anyway to make this work ? to connect Pika's basic_consume method to a matlab callback ?
Thanks.

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回答（1 个）

Abhijeet
Abhijeet 2023-8-30
Hi Ran,
I can understand that you want to use a callback function written in MATLAB and use it inside ‘basic_consume’ function defined in pika library. In order to use MATLAB callback function inside ‘basic_consume’ you can refer the following steps: -
  1. You can write a MATLAB script which defines the callback function.
  2. Inside a python script write a callback function that calls MATLAB using ‘MATLAB Engine API for Python’. Please refer to the following example code :-
import matlab.engine
def python_callback( ):
eng = matlab.engine.start_matlab()
eng.Callbackfunction(nargout=0)
eng.quit()
3. Use the callback written inside python script as argument for ‘basic_consume’ function.
To learn more about the ‘MATLAB Engine API for Python’ please refer to the following documentation: https://www.mathworks.com/help/matlab/matlab_external/get-started-with-matlab-engine-for-python.html

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