QNetworkReply :: error信号何时会出现Finished（）信号？

Question

For the signal:

QNetworkReply::error(QNetworkReply::NetworkError code)

Qt's documentation said:

This signal is emitted when the reply detects an error in processing. The finished() signal will probably follow, indicating that the connection is over.

To be specific, when will the finished() signal be emitted and when not?

Answer 1

When will QNetworkReply::error signal followed by a finished() signal? To be specific, when will the finished() signal be emitted and when not?

Signal finished() is emitted when request is finished either due to data transmission complete or an error during transmission. Signal error() is happening right before finished() in case of an error. In practice we can handle finished() for both "error" and "transmission successful".

To illustrate:

// connect 'finished' signal with consumer
connect(&s_networkAccessManager, SIGNAL(finished(QNetworkReply*)),
        this, SLOT(requestFinished(QNetworkReply*)));



void MyClass::requestFinished(QNetworkReply* pReply)
{
    if ( pReply )
    {
         if (pReply->error() == QNetworkReply::NoError)
             consumeData(pReply)
         else
             errorHandler(pReply->error(), pReply->errorString());
    }
}