Russian Qt Forum

...
725    inline QString::QString(const QString &other) : d(other.d)
726    { Q_ASSERT(&other != this); d->ref.ref(); }
...

    timer = new QTimer();
    connect(this, SIGNAL(startTimer()),timer,SLOT(start()));
    connect(this, SIGNAL(stopTimer()),timer,SLOT(stop()));
    connect(timer, SIGNAL(timeout()), this, SLOT(checkWork()));
    timer->setInterval(30000); // 30 sec

    if(!sManagerWasCreated)
    {
        manager = new QNetworkAccessManager(); // тут утечки памяти
        sManagerWasCreated = true;
    }
    emit startTimer();
    connect(manager, SIGNAL(finished(QNetworkReply*)),this, SLOT(checkSiteFinished(QNetworkReply*)));  
    replyWasDeleted = false;
    reply = manager->get(QNetworkRequest(QUrl(sDomain,QUrl::TolerantMode)));                    //qDebug()<<"4";  
    connect(reply,SIGNAL(destroyed()),this,SLOT(replyDestroyed()));

    if(!mtx.tryLock()) return;
    emit stopTimer();
    //qDebug()<<"finished begin";
    //    if(isFinished())
    //    {
    //        return;
    //    }


    QByteArray data;
    try
    {
        data = reply->read(reply->bytesAvailable());
    }
    catch(int e)
    {                           //qDebug()<<"error read";
        emit siteErrorSig();
        try
        {
            if(!replyWasDeleted)
            {
                reply->abort();
                reply->deleteLater();
            }
        }
        catch(int e)
        {
            //qDebug()<<"Error deleting reply";
        }
        //manager->deleteLater();
        offNode();
        return;
    }

    try
    {
        reply->abort();//qDebug()<<"6";
        reply->deleteLater();
    }
    catch(int e)
    {
        //qDebug()<<"Error deleting reply";
    }

   if(!mtx.tryLock()) return;
    emit stopTimer();
    try
    {
        if(!replyWasDeleted)
        {
            reply->abort();
            reply->deleteLater();
        }
    }
    catch(int e)
    {
        //qDebug()<<"Error deleting reply";
    }
    //manager->deleteLater();

reply->abort();
reply->deleteLater();

reply = manager->get(QNetworkRequest(QUrl(sDomain,QUrl::TolerantMode)));

connect(reply,SIGNAL(destroyed()),this,SLOT(replyDestroyed()));

connect(reply,SIGNAL(destroyed()),this,SLOT(replyDestroyed()));

replyWasDeleted = true;

void VBCheckURLThread::runChecking()
{
    mtx.unlock();  <<<<<<<<<<<<<<<<<<<<<=========== Что за ??? :)
    if(!sManagerWasCreated)
    {
        manager = new QNetworkAccessManager(); // тут утечки памяти
        sManagerWasCreated = true;
    }
    connect(manager, SIGNAL(finished(QNetworkReply*)),this, SLOT(checkSiteFinished(QNetworkReply*)));   // тут утечки памяти
    connect(manager, SIGNAL(authenticationRequired(QNetworkReply*,QAuthenticator*)),this, SLOT(checkAuthenticationRequired(QNetworkReply*,QAuthenticator*)));
    replyWasDeleted = false;
    reply = manager->get(QNetworkRequest(QUrl(sDomain,QUrl::TolerantMode)));                    //// qDebug()<<"4";   // тут утечки памяти
    connect(reply,SIGNAL(destroyed()),this,SLOT(replyDestroyed()));
    emit startTimer(30000);
}

void VBCheckURLThread::runChecking()
{
    //mtx.unlock(); /////////////////////////////////////// - ЗАКОМЕНТИРОВАЛ
    if(!sManagerWasCreated)
    {
 
  ...
}

void VBCheckURLThread::checkWork()
{
 ...
    offNode();
    mtx.unlock(); ////////////////////////////////////// ДОБАВИЛ ++++++++
}

void VBCheckURLThread::checkSiteFinished(QNetworkReply* localReply)
{
  ...
        offNode();
        mtx.unlock(); ////////////////////////////////////// ДОБАВИЛ перед RETURN ++++++++
        return;
  ...
    offNode();
    mtx.unlock(); ////////////////////////////////////// ДОБАВИЛ ++++++++
}