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【QT线程】子线程阻塞主线程的一次网络api请求案例

news 来源：原创 2025/5/25 8:48:13

阻塞源码赏析

这是最近一次项目遇到的问题，原因是我觉得子线程里俩次请求间隔太短了，会引起服务器屏蔽我的api因此，我故作聪明加多了一个延时函数，欢迎各位鉴赏代码。

// 并行发起双请求
QNetworkRequest liveRequest(liveUrl);
liveRequest.setSslConfiguration(sslConfig);
QNetworkReply *liveReply = m_manager->get(liveRequest);

 QThread::msleep(10000);  

QNetworkRequest forecastRequest(forecastUrl);
forecastRequest.setSslConfiguration(sslConfig);
QNetworkReply *forecastReply = m_manager->get(forecastRequest);

// 处理实时响应
connect(liveReply, &QNetworkReply::finished, [this, liveReply]() {
    if (liveReply->error() == QNetworkReply::NoError) {
        QJsonDocument doc = QJsonDocument::fromJson(liveReply->readAll());
        parseLiveData(doc.object());
    }
    liveReply->deleteLater();
});

// 处理预报响应
connect(forecastReply, &QNetworkReply::finished, [this, forecastReply]() {
    if (forecastReply->error() == QNetworkReply::NoError) {
        QJsonDocument doc = QJsonDocument::fromJson(forecastReply->readAll());
        parseForecastData(doc.object());
    }
    forecastReply->deleteLater();
});

下面这个版本才是不会引起主线程阻塞的版本，各位可以分析是什么原因导致了主线程阻塞。

// 串行发起双请求
QNetworkRequest liveRequest(liveUrl);
liveRequest.setSslConfiguration(sslConfig);
QNetworkReply *liveReply = m_manager->get(liveRequest);

// 处理实时响应
connect(liveReply, &QNetworkReply::finished, [this, liveReply]() {
    if (liveReply->error() == QNetworkReply::NoError) {
        QJsonDocument doc = QJsonDocument::fromJson(liveReply->readAll());
        parseLiveData(doc.object());
        QThread::msleep(1000);
    }
    liveReply->deleteLater();
});

QNetworkRequest forecastRequest(forecastUrl);
forecastRequest.setSslConfiguration(sslConfig);
QNetworkReply *forecastReply = m_manager->get(forecastRequest);

// 处理预报响应
connect(forecastReply, &QNetworkReply::finished, [this, forecastReply]() {
    if (forecastReply->error() == QNetworkReply::NoError) {
        QJsonDocument doc = QJsonDocument::fromJson(forecastReply->readAll());
        parseForecastData(doc.object());
    }
    forecastReply->deleteLater();
});