Chat program using udp socket

If a packet gets lost or the packets arrive out of order, then the application should detect and remedy the situation on its own. Firstly, UDP supports multicast — sending a single packet to multiple machines. This is useful as it saves bandwidth, each packet is transmitted only once and the entire network receives it. Let's take a look at one of them:. The BeginReceiveFrom method accepts data from any remote host on a connectionless socket.

Notice that the BeginReceiveFrom method is similar to the BeginReceive method, except that it specifies a reference to an EndPoint object. The EndPoint object defines the remote host IP address and the port number that sent the data. The AsyncCallback function is called when the function completes. Just as events can trigger delegates,.

NET also provides a way for methods to trigger delegates. NET AsyncCallback class allows methods to start an asynchronous function and supply a delegate method to call when the asynchronous function completes.

The state object is used to pass information between the BeginAccept and the corresponding AsyncCallback function. The EndReceiveFrom method returns the number of bytes read from the socket, and places the received data in the data buffer defined in the BeginReceiveFrom method.

To create a datagramSocket following constructors can be used: protected DatagramSocket DatagramSocket :. Skip to content. Change Language. Related Articles. Table of Contents. Improve Article. Save Article. Like Article. Attention reader! Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. Create a free Team What is Teams? Collectives on Stack Overflow.

Learn more. Asked 4 years, 3 months ago. Active 4 years, 3 months ago. Viewed 2k times. If you have empty catch blocks, of course you won't see errors. Add a comment. Active Oldest Votes. Rather than simply ignoring exceptions, you should at least be printing their cause.

In your catch statements, add the following and you will be able to more easily debug.