Question

我知道在4.8版本中，每个http请求都有自己的线程来运行我正在做一个链接检查应用程序，它在while循环中执行了很多http请求，我在Windows任务管理器中注意到我的应用程序随着时间的推移使用了超过1600个线程并且数量永远不会下降，直到它崩溃为止该应用程序。（我猜这就是原因。）

我的问题是，QNetworkAccessManager是否可以选择使用线程池？或者它有完成其http请求后清除其线程的选项吗？

这是主循环：

while(!rpm_urlStack->isEmpty())
{
    QString url = rpm_urlStack->top();

    //define the reply
    QNetworkReply *reply;
    rpm_urlStack->pop();

    QString urlForReq(url);

    bool returnVal = true;
    QNetworkRequest request;

    request.setUrl(QUrl(urlForReq));
    request.setRawHeader("User-Agent", USER_AGENT.toUtf8());
    request.setRawHeader("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
    request.setRawHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    request.setRawHeader("Accept-Language", "en-us,en;q=0.5");
    request.setRawHeader("Connection", "Keep-Alive");

    QEventLoop loop;
    reply = m_networkManager->get(request);
    connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
    loop.exit();

    if(!loop.isRunning()) {
        loop.exec();
    }

    RequestFinishedHandler(reply);

    // this is how I delete the reply object
    delete reply;
}

RequestFinishedHandler(QNetworkReply *reply)
{
    if (reply->error() > 0) {
        QNetworkReply::NetworkError networkError = reply->error();
        QString err = reply->errorString();
    } else {
        QVariant vStatusCodeV = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
        QMutexLocker lock(_pMutex); // _pMutex defined as class member
        char *buffer;
        buffer = getCurrentDateTime();
        QTextStream out(m_file);
        out << buffer << "  " << _sCurrentUrl << "\n";
        lock.unlock();

        if(vStatusCodeV.toInt() == 200) {
            QString ApiResponse;
            QByteArray data;
            data=reply->readAll();
            ApiResponse.append(QString::fromUtf8(data));
        }
    }
}

Answer 1

要使appears有效，必须在事件循环中调用deleteLater方法，事件循环必须重新获得对执行的控制才能处理垃圾回收。

也许您应该重构代码以使事件循环替换您的while循环。或者，由于您没有使用finished广告位来处理回复，也许您可以直接在RequestFinishedHandler功能的末尾删除回复。

QNetworkAccessManager线程永远不会完成

1 个答案: