Use other sockets with Processing network client

Processing Coding Questions
1

I have written a game server in Python (it’s more fit for the job, with async and all). Now I’m working to integrate its functionality with Processing. I’m using Client from processing.net.*

Here’s an example of my issue:
(Python)

from socket import socket
a = socket()
a.bind(('0.0.0.0', 9050))
a.listen(1)
b, c = a.accept()  # accepts connection from processing client
print(b.recv(1024).decode()) # so far so good, prints out -> gday
b.send(b'hello there')

(Processing)

import processing.net.*;

Client client;

void setup() {
    client = new Client(this, "127.0.0.1", 9050); // Connects to python server
    client.write("hello");  // so far so good
}

void clientEvent(Client client) {
    String in = client.readString();  // problem! program quits with error
    println(in);
}

(Error, from Processing)

Receiving:h
error, disabling clientEvent() for 127.0.0.1
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at processing.net.Client.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
	at server.clientEvent(server.java:49)
	... 6 more
2

Here’s the full story.

I’m stupid.

1 Like
3

I’m curious (And I bet people in the future will be as well)

4

It’s important to note that the error displayed is slightly misleading.
When it says

error, disabling clientEvent() for 127.0.0.1

It is merely displaying a symptom of the actual issue. In fact, the actual issue was entirely unrelated to networking. The lesson to be learned is to notice the trace a few lines down.

Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
	at server.clientEvent(server.java:49)

I fixed that issue.

2 Likes