QWebSocket client example


The EchoClient example implements a WebSocket client that sends a message to a WebSocket server and dumps the answer that it gets back. This example should ideally be used with the EchoServer example.


We start by connecting to the `connected()` signal.

EchoClient::EchoClient(const QUrl &url, bool debug, QObject *parent) :
    if (m_debug)
        qDebug() << "WebSocket server:" << url;
    connect(&m_webSocket, &QWebSocket::connected, this, &EchoClient::onConnected);
    connect(&m_webSocket, &QWebSocket::disconnected, this, &EchoClient::closed);

After the connection, we open the socket to the given url.

void EchoClient::onConnected()
    if (m_debug)
        qDebug() << "WebSocket connected";
    connect(&m_webSocket, &QWebSocket::textMessageReceived,
            this, &EchoClient::onTextMessageReceived);
    m_webSocket.sendTextMessage(QStringLiteral("Hello, world!"));

When the client is connected successfully, we connect to the `onTextMessageReceived()` signal, and send out "Hello, world!". If connected with the EchoServer, we will receive the same message back.

void EchoClient::onTextMessageReceived(QString message)
    if (m_debug)
        qDebug() << "Message received:" << message;

Whenever a message is received, we write it out.

© 2024 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.