Write two C programs to simulate a simple chatting application between two users

Question

Write two C programs to simulate a simple chatting application between two users using TCP sockets. The client program either accept a command or a text line to be to the other user. A command starts the text do not. The application support the following commands: /connect ip port: to connect to a server Iname string: to select a name for the user /disconnect: to close the connection with serwer Mexit: to terminate the application The server takes two command line arguments when it is executed. The a represent the port number and user name. The user at server side, only respond to the text sent by the user at the client side. The server can with only one client time. on both sides the conversation text should be printed starting with the user name who issued the text. Here is a sample output on the client side: /name Ahmed Name changed /connect x.x.x.x yy >Connected. Ahmed: I have a question about this course What is the Internet? Khaled: Good question! The Internet is simply the network of networks. Ahmed: Thanks for the answer. Khaled: You are welcomed. Ahmed /disconnect /exit >Bye Test the programs and make sure you handle all cases, exceptions and cover possible user mistakes. You must submit a compressed file that contains: 1- Two C program source codes 2- Print screen of the sample run of both sides

Explanation / Answer

import java.net.*; import java.io.*; import java.applet.*; import java.awt.*; public class ChatClient extends Applet { private Socket socket = null; private DataInputStream console = null; private DataOutputStream streamOut = null; private ChatClientThread client = null; private TextArea display = new TextArea(); private TextField input = new TextField(); private Button send = new Button("Send"), connect = new Button("Connect"), quit = new Button("Bye"); private String serverName = "localhost"; private int serverPort = 4444; public void init() { Panel keys = new Panel(); keys.setLayout(new GridLayout(1,2)); keys.add(quit); keys.add(connect); Panel south = new Panel(); south.setLayout(new BorderLayout()); south.add("West", keys); south.add("Center", input); south.add("East", send); Label title = new Label("Simple Chat Client Applet", Label.CENTER); title.setFont(new Font("Helvetica", Font.BOLD, 14)); setLayout(new BorderLayout()); add("North", title); add("Center", display); add("South", south); quit.disable(); send.disable(); getParameters(); } public boolean action(Event e, Object o) { if (e.target == quit) { input.setText(".bye"); send(); quit.disable(); send.disable(); connect.enable(); } else if (e.target == connect) { connect(serverName, serverPort); } else if (e.target == send) { send(); input.requestFocus(); } return true; } public void connect(String serverName, int serverPort) { println("Establishing connection. Please wait ..."); try { socket = new Socket(serverName, serverPort); println("Connected: " + socket); open(); send.enable(); connect.disable(); quit.enable(); } catch(UnknownHostException uhe) { println("Host unknown: " + uhe.getMessage()); } catch(IOException ioe) { println("Unexpected exception: " + ioe.getMessage()); } } private void send() { try { streamOut.writeUTF(input.getText()); streamOut.flush(); input.setText(""); } catch(IOException ioe) { println("Sending error: " + ioe.getMessage()); close(); } } public void handle(String msg) { if (msg.equals(".bye")) { println("Good bye. Press RETURN to exit ..."); close(); } else println(msg); } public void open() { try { streamOut = new DataOutputStream(socket.getOutputStream()); client = new ChatClientThread(this, socket); } catch(IOException ioe) { println("Error opening output stream: " + ioe); } } public void close() { try { if (streamOut != null) streamOut.close(); if (socket != null) socket.close(); } catch(IOException ioe) { println("Error closing ..."); } client.close(); client.stop(); } private void println(String msg) { display.appendText(msg + " "); } public void getParameters() { serverName = getParameter("host"); serverPort = Integer.parseInt(getParameter("port")); } }

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.