How to send and receive a numpy array from python to Unity via socket

Question

I am trying to send python array between python program and Unity3D. Here is the python part to send a string message:

#send the message

import socket

UDP_IP = "127.0.0.1"
UDP_PORT = 5065

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

msg = "Hello word!"

sock.sendto(msg, (UDP_IP, UDP_PORT))


#receive the message in Unity (C-sharp)

IPEndPoint anyIP = new IPEndPoint(IPAddress.Parse("0.0.0.0"), port);

byte[] data = client.Receive(ref anyIP); 

string text = Encoding.UTF8.GetString(data);

I know that I can transform the numpy array to a string format and parse it to float in Unity. Is there any other elegant way to send and receive a numpy array instead of string?

bavaza · Accepted Answer · 2019-09-15 08:42:14Z

1

Since numpy's ndarray is a binary construct, you need a way to serialize it in Python, and de-serialize in C#.

For serialization, you can use ndarray.tobytes(). To de-serialize, you must pay attention to the data type (double, int, etc.), and the machine's Endianess (little or big).

Also, if you are passing high-dimensional arrays, note the 'C' vs 'Fortran' capabilities of ndarray.tobytes().

For example, in C#, you can deserialize an array of bytes to an array of doubles using Buffer.BlockCopy(), see, for example, this question.

Disclaimer: I haven't tried the above method myself.

answered Sep 15, 2019 at 8:42

bavaza

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