QT: downloadProgress not emitted from QNetworkReply

Question

Hi All

I'm trying to build a module which downloads a binary file in QT, using QNetworkAccessManager. I use the same approach detailed in the documentation (see below), but while I do get readyRead signals, downloadProgress never arrives.

everything happens on the same thread (the project is big so i cannot paste it all)

any ideas? i've exhausted many, many trials - and any thought would be appreciated

thanks very much, Lior

QNetworkRequest request; request.setUrl("http://XXX.s3.amazonaws.com/XXX.exe"); request.setRawHeader("User-Agent", "MyOwnBrowser 1.0");

QNetworkAccessManager * m_manager = new QNetworkAccessManager( this ); m_reply = m_manager->get(request); m_reply->setParent(this);

connect(m_reply, SIGNAL(readyRead()), this, SLOT(slotReadyRead())); connect(m_reply, SIGNAL(downloadProgress(qint64 bytesReceived, qint64 bytesTotal)), this, SLOT(replyDownloadProgress(qint64 bytesReceived, qint64 bytesTotal)));

Answer 1

ok found it wow what an simple mistake.

the answer is syntactic:

connect(m_reply, SIGNAL(downloadProgress(qint64 bytesReceived, qint64 bytesTotal)), this, SLOT(replyDownloadProgress(qint64 bytesReceived, qint64 bytesTotal)));

is an error

it should be: connect(m_reply, SIGNAL(downloadProgress(qint64 , qint64 )), this, SLOT(replyDownloadProgress(qint64 , qint64 ));

once i changed it, i got the signal.

QT DOES NOT CHECK SYNTAX ERRORS IN ITS PREPROCESSOR (note to self)

Answer 2

I've patched my Qt to use a qFatal() instead of qWarning(), so the app asserts instead of printing error messages (that cannot be seen when linking against a release-build Qt). YMMV.