Qt 5.6 retrieving QObject sender

Mertanian

My project works fine with Qt 5.5.1 msvc 2013 problems occured when I switched
to Qt 5.6.
Here is simplified code (only not working part) for downloading file from ftp:

void fun()
{
QNetworkAccessManager qnam; // in project it is class member
QNetworkRequest request; // also class member
request.setAttribute(QNetworkRequest::User, reqIndex); // lets say reqIndex = 0
QNetworkReply* pReply = qnam.get(request); // also class member
connect(pReply, SIGNAL(finished()), this, SLOT(onFinished()));
connect(pReply, SIGNAL(downloadProgress(qint64,qint64)), this,
SLOT(onDownloadProgress(qint64, qint64)));
}

void onFinished()
{
QNetworkReply* pCallerReply =
dynamic_cast<QNetworkReply*>(QObject::sender());
// pCallerReply is not nullptr
int itemIndex = pCallerReply->request().attribute(QNetworkRequest::User, QVariant(-1)).toInt(&convertStatus;);
// in Qt 5.6 itemIndex is always default QVariant(-1), convertStatus is true
}

// here is the same as onFinished()
void onDownloadProgress(qint64, qint64)
{
QNetworkReply* pCallerReply =
dynamic_cast<QNetworkReply*>(QObject::sender());
// pCallerReply is not nullptr
int itemIndex = pCallerReply->request().attribute(QNetworkRequest::User, QVariant(-1)).toInt(&convertStatus;);
// in Qt 5.6 itemIndex is always default QVariant(-1), convertStatus is true
}

What could be a reason of this behavior? What can I do with it?

SGaist

Hi,

The fact that you get -1 and convertStatus true just indicates that you are likely getting the default value.

Can you create a minimal compilable example that shows that behavior ?