QWebSocket 客戶端範例

描述

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.

代碼

我們從連接到 connected() 信號開始。

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));
}

連接後，打開套接字為給定 url .

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

當客戶端連接成功時，我們連接到 onTextMessageReceived() 信號，並發送輸齣 Hello, world!。若與 EchoServer 連接，我們將收到相同消息。

void EchoClient::onTextMessageReceived(QString message)
{
    if (m_debug)
        qDebug() << "Message received:" << message;
    m_webSocket.close();
}

每當收到消息時，我們把它寫入輸齣。