在客户端请求到视频token后，每5min保活一次，避免视频token丢失 qt代码-QT开发中文网

这是一个示例Qt代码，用于在客户端请求到视频token后每5分钟保活一次，避免视频token丢失：

#include <QObject>
#include <QTimer>
#include <QNetworkAccessManager>
#include <QNetworkReply>

class VideoTokenKeeper : public QObject
{
    Q_OBJECT

public:
    VideoTokenKeeper(QObject *parent = nullptr)
        : QObject(parent)
        , m_networkAccessManager(new QNetworkAccessManager(this))
        , m_token("")
    {
        // 在构造函数中连接定时器的timeout()信号到槽函数
        connect(&m_timer, &QTimer::timeout, this, &VideoTokenKeeper::refreshToken);
    }

    void start(const QString &url)
    {
        // 发送请求获取初始的视频token
        QNetworkReply *reply = m_networkAccessManager->get(QNetworkRequest(url));
        connect(reply, &QNetworkReply::finished, this, [this, reply]() {
            if (reply->error() == QNetworkReply::NoError) {
                m_token = reply->readAll();
                // 启动定时器
                m_timer.start(5 * 60 * 1000); // 5min
            } else {
                qDebug() << "Failed to get video token: " << reply->errorString();
            }
            reply->deleteLater();
        });
    }

signals:
    void tokenRefreshed(const QString &token);

private slots:
    void refreshToken()
    {
        // 发送请求更新视频token
        QNetworkReply *reply = m_networkAccessManager->get(QNetworkRequest("https://example.com/refresh_token"));
        connect(reply, &QNetworkReply::finished, this, [this, reply]() {
            if (reply->error() == QNetworkReply::NoError) {
                m_token = reply->readAll();
                emit tokenRefreshed(m_token);
            } else {
                qDebug() << "Failed to refresh video token: " << reply->errorString();
            }
            reply->deleteLater();
        });
    }

private:
    QNetworkAccessManager *m_networkAccessManager;
    QTimer m_timer;
    QString m_token;
};

使用示例：

VideoTokenKeeper *tokenKeeper = new VideoTokenKeeper(this);
connect(tokenKeeper, &VideoTokenKeeper::tokenRefreshed, this, [](const QString &token) {
    qDebug() << "Video token refreshed: " << token;
});
tokenKeeper->start("https://example.com/get_token");

这里假设视频token的获取和刷新分别对应以下两个HTTP请求：