Chat-Room-using-Socket

There are two versions of the program.

• version 1 (simple)
• version 2 (extra features)

For learning purpose download the files in Chat Room Version 1 . Then run the server.py and then client.py.

How to run the server.py.
eg:

>python3 server.py "localhost" 1234

How to run the client.py.
eg:

>python3 client.py "localhost" 1234

Here "localhost" is the server you wanna connect. Now just start chatting.

Some Screenshots

We will be creating a server and two clients to demonstrate how it works

Version 1

Version 2

Here we can see 3 terminals

1. Server
2. Client1
3. Client2

Since we are testing it in the same computer we are using localhost for clients to connect. As a result every ip looks the same.But if we connect with other computer we will see different ip addresses.

We can also see the disconnected clients on the server

Version.1 vs Version.2

Version 1:
- we are using fixed length of bytes for sending and receiving data(2048 bytes).
- here only the ip is visible

Version 2:
- we are using fixed length of bytes for sending and receiving data(2048 bytes).
- ip and name of the user can be seen.
- if the user is connected then everyone is notified.
- if the user is disconnected then everyone is notified.
- colored text is used
- by typing 'QUIT' we can exit the chat.

Now u can create more complicated versions.Its up to you.

Explanation

This a simple expaination of the version 2 app

Some problems

This app does not run in windows. Unfortunately, select will not help you to process stdin and network events in one thread, as select can't work with streams on Windows. What you need is a way to read stdin without blocking. You may use:

• An extra thread for stdin. That should work fine and be the easiest way to do the job. Python threads support is quite ok if what you need is just waiting for I/O events.

Source https://stackoverflow.com/questions/22251809/python-select-select-on-windows

Solution to the Problem

client.py for windows

# Python program to implement client side of chat room. 
import socket 
import select 
import sys 
import threading

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
if len(sys.argv) != 3: 
	print ("Correct usage: script, IP address, port number") 
	exit() 


IP_address = str(sys.argv[1]) 
Port = int(sys.argv[2]) 
server.connect((IP_address, Port)) 

# at the starting it will just send the name
name = ''
name = input('Enter your name: ')
server.send(bytes(name , 'utf-8'))



def recv_msg(conn):
    while 1:
        try:
            message = conn.recv(2048).decode('utf-8') 
            print (message) 
        except :
            # if the connection is broken
            print('Connection Broken')
            conn.close()
            quit()

def send_msg(conn):
    while 1:
            
        message = input() 

        # if the user wants to quit
        if message == 'QUIT':
            conn.close()
            quit()

        # for blue text	
        print("\x1b[1;36;40m{}\x1b[0m {}".format(" You " , message))
        conn.send(bytes(message , 'utf-8'))

try:

    t1 = threading.Thread(target=recv_msg , args=(server,))
    t2 = threading.Thread(target=send_msg , args=(server,))


    t1.start()
    t2.start()

    t1.join()
    t2.join()
    # _thread.start_new_thread(recv_msg , (server , ))
    # _thread.start_new_thread(send_msg , (server , ))
except:
    print('Something went wrong')
    server.close()


server.close() 

The End