To get familiar with
QTcpSocket, let's develop a simple chat program. This example will teach you the basic knowledge of network handling in Qt so that you can use this skill later to connect two or more copies of a game. At the end of this exercise, we want to see something like this:
On both the left-hand side and the right-hand side of the preceding figure, you can see a client, whereas the server is in the middle. We'll start by taking a closer look at the server.