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Game Programming using Qt 5 Beginner's Guide - Second Edition by Lorenz Haas, Witold Wysota, Pavel Strakhov

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The error signal

Instead of dealing with errors in the slot connected to the finished() signal, you can use the reply's error() signal, which passes the error of the QNetworkReply::NetworkError type to the slot. After the error() signal has been emitted, the finished() signal will, most likely, also be emitted shortly.

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