QNetworkAccessManager内存问题

Question

我正在开发一个应用程序，它使用QtNetworkAccessManager向服务器发送请求并存储回复。我已经使它工作，但内存使用是不断增加，直到和它阻止了整个PC。我认为这个问题与调用删除器()和事件循环有关，但我看不出如何修复它。以下是代码：

main.cpp

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    ReadConfig();
    Ethernet M2;
    return a.exec();
}

Ethernet.h

class Ethernet : public QObject
{
    Q_OBJECT

public:
    Ethernet();
    ~Ethernet();
    QTimer *timer;

private
    QNetworkAccessManager *manager;

public slots:
    void Cycle();
    void replyAuthenticationRequired(QNetworkReply *reply, QAuthenticator *auth);
    void replyFinished(QNetworkReply *reply);
};

Ethernet.cpp

Ethernet::Ethernet() 
{
    timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(Cycle()));
    timer->start(1000);

    manager = new QNetworkAccessManager(this);
    connect(manager, SIGNAL(authenticationRequired(QNetworkReply*,QAuthenticator*)), this, SLOT(replyAuthenticationRequired(QNetworkReply*,QAuthenticator*)));
    connect(manager, SIGNAL(finished(QNetworkReply*)), this,     SLOT(replyFinished(QNetworkReply*)));
}

void Ethernet::Cycle()
{
    for (BYTE i=0; i< NUM_TOTAL_VEHICLES; i++)
    {
        FailCheck(i,FILTER_VALUE_PRIORITY_A1);
        FailCheck(i,FILTER_VALUE_PRIORITY_A);
        FailCheck(i,FILTER_VALUE_PRIORITY_B);
        FailCheck(i,FILTER_VALUE_PRIORITY_C);
    }
}

void Ethernet::FailCheck (BYTE coach, BYTE priority)
{
    //Build a valid URL
    QString qsURL = "http://";
    ...
    ..
    .
    //

    manager->get(QNetworkRequest(QUrl(qsURL)));
}

void Ethernet::replyAuthenticationRequired(QNetworkReply *reply, QAuthenticator *auth)
{
   if(!reply->error())
   {
       auth->setUser(DB_USR);
       auth->setPassword(DB_PWD);
   }
   reply->deleteLater();
}

void Ethernet::replyFinished (QNetworkReply *reply)
{
    if(!reply->error())
    {
        //Do some task with the reply;
    }
    reply->deleteLater();
}

如有任何建议，我将不胜感激。谢谢!

Answer 1

您需要从QObject中子类以太网以正确使用事件循环。

Answer 2

您不能使用QNetworkAccessManager创建多个对象。正如文档所述，“对于整个Qt应用程序来说，一个QNetworkAccessManager就足够了”，参考链接。如果生成以太网类的多个对象，则会产生内存问题。您还需要将QObject作为以太网的基类。

manager = new QNetworkAccessManager(this);
this (Ethernet) must have QObject as base class.