QWebSocket client example
Description
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.
Code
We start by connecting to the `connected()` signal.
EchoClient::EchoClient(const QUrl &url, bool debug, QObject *parent) : QObject(parent), m_url(url), m_debug(debug) { if (m_debug) qDebug() << "WebSocket server:" << url; connect(&m_webSocket, &QWebSocket::connected, this, &EchoClient::onConnected); connect(&m_webSocket, &QWebSocket::disconnected, this, &EchoClient::closed); m_webSocket.open(QUrl(url)); }
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; m_webSocket.close(); }
Whenever a message is received, we write it out.
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Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-5.9/echoclient.html