Introduction

• Qt Signal Slot Sender
• Qt Connect Signal Slot

Qt Network provide tools to easily use many network protocols in your application.

TCP Client

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To create a TCP connection in Qt, we will use QTcpSocket. First, we need to connect with connectToHost.

So for example, to connect to a local tcp serveur: _socket.connectToHost(QHostAddress('127.0.0.1'), 4242);

Then, if we need to read datas from the server, we need to connect the signal readyRead with a slot. Like that:

and finally, we can read the datas like that:

To write datas, you can use the write(QByteArray) method:

So a basic TCP Client can look like that:

main.cpp:

mainwindow.h:

mainwindow.cpp:

mainwindow.ui: (empty here)

TCP Server

Create a TCP server in Qt is also very easy, indeed, the class QTcpServer already provide all we need to do the server.

First, we need to listen to any ip, a random port and do something when a client is connected. like that:

Qt Signal Slot Sender

Then, When here is a new connection, we can add it to the client list and prepare to read/write on the socket. Like that:

The stateChanged(QAbstractSocket::SocketState) allow us to remove the socket to our list when the client is disconnected.

So here a basic chat server:

main.cpp:

Qt Connect Signal Slot

mainwindow.h:

mainwindow.cpp:

(use the same mainwindow.ui that the previous example)