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Thread: Downloading XML file

  1. #1
    Join Date
    Mar 2014
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    Default Downloading XML file

    Hello,
    i want to get a XML file from online source,
    example:
    http://api.openweathermap.org/data/2...kikda&mode=xml
    how can i download it and store the data in QTemporaryFile or pass it directly to QXmlStreamReader
    i tried a lot but i dont know what is the problem exactly
    example:
    Qt Code:
    1. int main(int argc, char *argv[])
    2. {
    3. QCoreApplication a(argc, argv);
    4. QNetworkAccessManager *manager = new QNetworkAccessManager;
    5. QNetworkRequest request(QUrl("http://api.openweathermap.org/data/2.5/weather?q=skikda&mode=xml"));
    6. QNetworkReply* reply = manager->get( request) ;
    7. QXmlStreamReader reader( reply );
    8.  
    9. return a.exec();
    10. }
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  2. #2
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    Default Re: Downloading XML file

    QNetworkAccessManager works asynchronous, the get() call returns immediately and the actual transfer happens over time.

    QNetworkReply is a QIODevice so it will signal incoming data via its readyRead() signal.
    You can also wait for it to finish() and then read all data in one go.

    QXmlStreamReader supports both partial data and full documents.

    Cheers,
    _

  3. #3
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    Default Re: Downloading XML file

    But none of this will happen if the app's event loop isn't running. So putting that code into main() before the QCoreApplication::exec() call will have no effect at all since there is no event loop yet to handle signals.

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