QWebSocket 客户端示例

说明

EchoClient 示例实现了一个 WebSocket 客户端，该客户端向 WebSocket 服务器发送消息，并输出收到的响应。该示例最好与 EchoServer 示例配合使用。

代码

首先，我们连接到 `connected()` 信号。

EchoClient::EchoClient(constQUrl&url, booldebug,QObject*parent) :
    QObject(parent),
    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(url);
}

连接建立后，我们向指定的url 打开套接字。

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

当客户端成功连接后，我们会连接到 `onTextMessageReceived()` 信号，并发送“Hello, world!”。如果连接到了 EchoServer，我们将收到相同的消息作为响应。

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

每当收到一条消息时，我们就会将其写出。

测试Qt WebSockets WebSocket 服务器示例

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