How to specify the IP when multi networkcard

Processing Libraries
1

i’m teacher and use processing in teaching
i ve 2 networks cards in the computer of the student. so i have 2 ipadresse. (ethernet and wlan)
how to specify the second adresse ip in : s = new Server(this, 8080);
i can’t set for exemple s = new Server(this, 8080,“192.168.1.12”);
because it will only works on one computer. I want it will work on any computer of my classroom
i have to set in s = new Server(this, 8080); the second ip adresse for the app works
thanks a lot
ps : sorry for the writting, i’m french

2

thanks to chatgpt i have a solution to implement.

import java.net.*;
import java.util.*;

void setup() {
  size(400, 200);
  try {
    Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
    while (interfaces.hasMoreElements()) {
      NetworkInterface iface = interfaces.nextElement();
      if (!iface.isLoopback() && iface.isUp()) {
        Enumeration<InetAddress> addresses = iface.getInetAddresses();
        while (addresses.hasMoreElements()) {
          InetAddress addr = addresses.nextElement();
          println("Interface: " + iface.getName() + ", IP: " + addr.getHostAddress());
        }
      }
    }
  } 
  catch (SocketException e) {
    e.printStackTrace();
  }
}

with addr.getHostAddress(), i have the IP of the computer

3

Hello @techno,

I took interest but could not run the code you provided because it was not properly formatted.

See:
https://discourse.processing.org/faq#format-your-code

I cut and past your code into ChatGPT and it corrected it.

Here is the code correctly formatted for posting:

void setup() {
    size(400, 200);
    try {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface iface = interfaces.nextElement();
            if (!iface.isLoopback() && iface.isUp()) {
                Enumeration<InetAddress> addresses = iface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    InetAddress addr = addresses.nextElement();
                    println("Interface: " + iface.getName() + ", IP: " + addr.getHostAddress());
                }
            }
        }
    } catch (SocketException e) {
        e.printStackTrace();
    }
}

:)