Two-way communication between C# WPF application and python script

Question

I'm trying to get a tow-way communication between a c# application and a python script that c# will call.

I have some input channels in c# that changes constantly at high frequency (5000-1000 data/s) for let's say a minute. On every change of those inputs,results are calculated and assigned to output variables. What i'm trying to do is to move the logic to a python script. For instance:

Inputs: double x,y
Output: double z

So the pyhton script should be capable of read the inputs, perform the logic and write the results at a symilar frequency.

Any recomendations? Has anyone did anything similar before?

First I tried to call the script on every change and read the console output. But the code in the script is not as simple as z=x*y and variables that store values are required in the pyhon script. For example, the script mught want to save the maximum value of x and y reached.

I had a look to ZeroMQ library for the communication, not sure how to use it though.

Please remember to accept and vote up the answer if your original issue has been solved and then ask a new question if you have another issue: https://stackoverflow.com/help/someone-answers — Frenchy, Apr 28 '20 at 14:58

score 1 · Answer 1 · answered Apr 25 '19 at 16:31

Here is a solution:

Simple C# program: client which sends data and receive

using System;
using ZeroMQ;

namespace ZeroMQ_Client
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var requester = new ZSocket(ZSocketType.REQ))
            {
                // Connect
                requester.Connect("tcp://127.0.0.1:5555");

                for (int n = 0; n < 10; ++n)
                {
                    string requestText = "Hello";
                    Console.Write("Sending {0}...", requestText);

                    // Send
                    requester.Send(new ZFrame(requestText));

                    // Receive
                    using (ZFrame reply = requester.ReceiveFrame())
                    {
                        Console.WriteLine(" Received: {0} {1}!", requestText, reply.ReadString());
                    }
                }
            }
        }
    }
}

python program, you have to install pyzmq:

#
#   Hello World server in Python
#   Binds REP socket to tcp://*:5555
#   Expects b"Hello" from client, replies with b"World"
#

import time
import zmq

context = zmq.Context()
socket = context.socket(zmq.REP)
socket.bind("tcp://*:5555")

while True:
    #  Wait for next request from client
    message = socket.recv()
    print("Received request: %s" % message)

    #  Do some 'work'
    time.sleep(1)

    #  Send reply back to client
    socket.send(b"World")

Thanks for the answer, that's a nice example. But im looking for something more asynchronous, so c# does not have to request the an answer. Maybe if i add another socket like you did on python it willsend requests to c# with the results data will work. — Diego Delgado, Apr 26 '19 at 08:09
asynchronous process is just the way to program . after to communicate between c# and python, you have more solutions, sockets, named pipe. .... — Frenchy, Apr 26 '19 at 08:20

Two-way communication between C# WPF application and python script

1 Answers1