Timeout reply from QNetworkReply

[Damian7546]

@SGaist said in Timeout reply from QNetworkReply:

Hi,

Use the finished signal of QNetworkReply.

Can you clarify ?

[SGaist]

Connect it a slot to it and there you can check whatever you want from the reply. The query will be done at that point.

[JoeCFD]

@SGaist It may not always be the case. If the reply comes instantly, the slot will never be called. Therefore, check the reply first and then connect.

[JonB]

@JoeCFD said in Timeout reply from QNetworkReply:

If the reply comes instantly, the slot will never be called. Therefore, check the reply first and then connect.

?

[JoeCFD]

@JonB

QNetworkReply *reply = manager.get(QNetworkRequest(QUrl(location)));
if ( nullptr != reply ) {
    if ( reply->isFinished()) { /* it may have been done already */
        call slot();
    }
    else {
        connect();
    }
}

[JonB]

@JoeCFD
Have you tested to see whether, with a connect(), the finished signal would still actually be received and trigger the slot (so no need to test isFinished())? My understanding is that is how slot connections work.

[JoeCFD]

@JonB I had a case before. Therefore, I know this.

[Damian7546]

@JoeCFD said in Timeout reply from QNetworkReply:

@JonB

QNetworkReply *reply = manager.get(QNetworkRequest(QUrl(location)));
if ( nullptr != reply ) {
    if ( reply->isFinished()) { /* it may have been done already */
        call slot();
    }
    else {
        connect();
    }
}

slot() --> it is my NetworkWorker::readyRead() ?

connect() --> what connect() are you talking about?

Still I do not know when I should emit signal about timeout recived data ....

[jsulm]

@Damian7546 said in Timeout reply from QNetworkReply:

connect() --> what connect() are you talking about?

connect(reply,&QNetworkReply::readyRead,this,&NetworkWorker::readyRead);

slot() is your NetworkWorker::readyRead.

[Damian7546]

And where timeout is expired ?
I still understand where I can give for example : qDebug() << "timeout has expired to receive data"

void NetworkWorker::get(QString location)
{
    QNetworkReply *reply = manager.get(QNetworkRequest(QUrl(location)));

    if ( nullptr != reply ) {
        if ( reply->isFinished()) {
            readyRead();
        }
        else {
            connect(reply,&QNetworkReply::readyRead,this,&NetworkWorker::readyRead);
        }
    }
}

void NetworkWorker::readyRead()
{
    QByteArray data;
    QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender());
    QVariant statusCode = reply->attribute( QNetworkRequest::HttpStatusCodeAttribute );

    if ( !statusCode.isValid() )
    return;

    int status = statusCode.toInt();
    if ( status != 200 )
    {
        QString reason = reply->attribute( QNetworkRequest::HttpReasonPhraseAttribute ).toString();
    }
    else
    {
        if (reply) {
            data = reply->readAll();
        }
        networkReply(data);
    }
}

[jsulm]

@Damian7546 Call https://doc.qt.io/qt-6/qnetworkreply.html#error in your readyRead() slot and check it return value.

[Damian7546]

@jsulm Can you give me an example ?

After QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender()); I added:
qDebug() << "http error: " << reply->error();
And when I have connection to http server the shows message:
http error: QNetworkReply::NoError

But nothing shows up when there is no connection, because readyread doesn't appear.

I should in this function check timeout:

void NetworkWorker::get(QString location)
{
    qInfo() << "Getting from server....";
    QNetworkReply *reply = manager.get(QNetworkRequest(QUrl(location)));


    connect(reply,&QNetworkReply::readyRead,this,&NetworkWorker::readyRead);

}

So in abov funnction added :
connect(reply,&QNetworkReply::errorOccurred,this,&NetworkWorker::errorOccurred);

but never occurred....