QTest and QEventLoop inside a library

[MementoMori]

Hi all,
inside a library I have code like:

QNetworkReply* AIDAW::getRequest(const QString& url){
    QEventLoop loop;
    QTimer timer;
 
    QNetworkRequest request(url);
    QNetworkReply *reply = this->network_manager->get(request);
 
    QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
    QObject::connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
 
    timer.start(TIMEOUT);
    loop.exec();
 
    if(timer.isActive() == false){
        //manage the timeout
    }
 
    return reply;
 
}

QNetworkReply* AIDAW::getRequest(const QString& url){
    QEventLoop loop;
    QTimer timer;

    QNetworkRequest request(url);
    QNetworkReply *reply = this->network_manager->get(request);

    QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
    QObject::connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));

    timer.start(TIMEOUT);
    loop.exec();

    if(timer.isActive() == false){
        //manage the timeout
    }

    return reply;

}

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If I try to write a QTest Project using this library I get this error:

********* Start testing of MyProject *********
Config: Using QTest library 4.7.0, Qt 4.7.0
PASS   : AIDATest::initTestCase()
QEventLoop: Cannot be used without QApplication
QObject::connect: Cannot connect (null)::aboutToQuit() to QNativeWifiEngine::clo
seHandle()
QObject::startTimer: QTimer can only be used with threads started with QThread
QObject::startTimer: QTimer can only be used with threads started with QThread

********* Start testing of MyProject *********
Config: Using QTest library 4.7.0, Qt 4.7.0
PASS   : AIDATest::initTestCase()
QEventLoop: Cannot be used without QApplication
QObject::connect: Cannot connect (null)::aboutToQuit() to QNativeWifiEngine::clo
seHandle()
QObject::startTimer: QTimer can only be used with threads started with QThread
QObject::startTimer: QTimer can only be used with threads started with QThread

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the main of the test project is managed by QTEST_MAIN(MyTestClass) macro

[franz]

It is unwise to start an event loop within an event loop. The issue you run into right now could be one you run into when running a program using the library. In this case you should probably start a thread (with an event loop then) and wait until the thread has finished doing it's job. Alternatively you could try a different approach, but that would require more knowledge of the nature of your system. See also http://labs.qt.nokia.com/2010/02/23/unpredictable-exec/.