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POQTimer timeout problems with QEventLoop and QNAM
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copied!<p>I have created my own HTTP class that utilizes QNAM and provides means for sending HTTP requests. It uses QEventLoop for synchronization and QTimer for timeouts.</p> <p>I'm facing few problems with my solution. On certain Symbian platforms my QTimer signals timeout too fast (e.g. like after 1 sec when timeout is 30 secs). This happends usually if my HTTP Post playload is large or if I'm downloading a file via GET (request takes some time to complete). I want to note that same code works fine on certain devices (S60 3rd ed.) but on the other hand some devices (5th edition) get this error almost all the time.</p> <p>Here is a code snippet:</p> <pre><code>MyHttp::MyHttp(QObject *parent) : QObject(parent) { m_Timer.setSingleShot(true); connect(&m_Manager, SIGNAL(finished(QNetworkReply*)), SLOT(OnFinished(QNetworkReply*))); connect(&m_Timer, SIGNAL(timeout()), SLOT(OnTimeout())); } void MyHttp::Post(const QString &data) { m_RetCode = 0; QNetworkRequest request(url); m_Reply = m_Manager.post(request, data.toAscii()); // QPointer<QNetworkReply> m_Reply m_Timer.start(30*1000); m_EventLoop.exec(); // Synchronization point } void MyHttp::OnFinished(QNetworkReply * reply) { // Handle response / Timeout / Errors reply->deleteLater(); // Use deleteLater() as adviced in the documentation StopWaiting(); } void MyHttp::StopWaiting() { m_Timer.stop(); m_EventLoop.exit(); } void MyHttp::OnTimeout() { m_RetCode = TIMEOUT; // #define TIMEOUT 50000 if(m_Reply.isNull() == false) { // Abort reply m_Reply->abort(); } } </code></pre> <p>Personally I think that one of the following might cause the problem:</p> <ul> <li>re-entering local event loop messes up the signals</li> <li>I'm utilizing same QNAM multiple times (several request during same session). This is required because if I destroy the QNAM my session goes down on the server side.</li> </ul> <p>Is anyone able to see some errors that might cause this behavior?</p> <p>Platform: Symbian S60 3rd/5th edition</p> <p>Tools: Nokia Qt SDK </p>

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