How to recognize QNetWorkReply.Error() form QNetWorkManager.get() or QNetWorkManager.put()

[sonichy]

B.cpp
QUrl url;
QNetworkAccessManager manager;

QNetworkReply *pReply = manager.put(QNetworkRequest(url), data);
connect(pReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SIGNAL(error(QNetworkReply::NetworkError)));

QNetworkReply *pReply = manager.get(QNetworkRequest(url));
connect(pReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SIGNAL(error(QNetworkReply::NetworkError)));

A.cpp
void MainWindow::error(QNetworkReply::NetworkError error)
{
    qDebug() << error;
    QMetaEnum metaEnum = QMetaEnum::fromType<QNetworkReply::NetworkError>();
    QNetworkReply *NReply = qobject_cast<QNetworkReply*>(sender());
    if(NReply->operation() == QNetworkAccessManager::PutOperation){// Crash NReply 0x0
        ui->label_error_upload->setText("Error: Upload " + QString(metaEnum.valueToKey(error)));
    }else{
        ui->label_error_download->setText("Error: Download " + QString(metaEnum.valueToKey(error)));
    }
}

[Pablo J. Rogina]

@sonichy said in How to recognize QNetWorkReply.Error() form QNetWorkManager.get() or QNetWorkManager.put():

QNetworkReply *pReply = manager.put(QNetworkRequest(url), data); connect(pReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SIGNAL(error(QNetworkReply::NetworkError)));
 
QNetworkReply *pReply = manager.get(QNetworkRequest(url));
connect(pReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SIGNAL(error(QNetworkReply::NetworkError)));

It seems strange, using the same pointer to hold two different objects...

Remember that you're creating two replies, one per request; and they'll be handled in the same slot which will be invoked twice, and to know which reply object there will be straightforward

[Gojir4]

@sonichy said in How to recognize QNetWorkReply.Error() form QNetWorkManager.get() or QNetWorkManager.put():

QNetworkAccessManager manager;

Just for clarify, is your instance of QNetworkAccessManager still alive at the time your slots are called ? Because as you are declaring it on the stack, it may be already destroyed and I presume it will also destroy internal QNetworkReply objects.