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Thread: QNetworkAccessManager & QML Progress

  1. #1
    Join Date
    May 2011
    Thanked 5 Times in 4 Posts
    Qt products
    MacOS X Unix/X11

    Default QNetworkAccessManager & QML Progress

    I am trying to use QNetworkAccessManger to upload a file and show progress. I have the upload portion working excellently. I cannot seem to get the Progress portion working.

    I have a QML ProgressBar on one screen of my mobile app. I tried setting up a Signal like so:

    Qt Code:
    1. QNetworkAccessManager *manager = new QNetworkAccessManager(this); //using qnetwork access manager for post data
    2. QObject *root = engine.rootObjects().first();
    3. root->setProperty("networkAccess",manager);
    5. manager->post(req,datas); //send all data
    6. connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(erroron_filesend(QNetworkReply*)));
    7. connect(manager, SIGNAL(uploadProgress(qint64 uplPart, qint64 uplTotal)), SLOT(progressChanged(qint64 uplPart, qint64 uplTotal)));
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    In my main.qml, tried to declare a local variant to hold a reference to the Manager:

    Qt Code:
    1. property variant networkAccess
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    Then in the QML with the ProgressBar I did this:

    Qt Code:
    1. ProgressBar {
    2. id: fileUplProgress
    3. visible: false
    4. busyLabel.bottom
    5. anchors.topMargin: Funcs.psize(10,parent.height)
    6. anchors.horizontalCenter: parent.horizontalCenter
    7. width: Funcs.psize(50,parent.width)
    8. height: Funcs.psize(5,parent.hight)
    10. minimumValue: 0.0
    11. maximumValue: 100.0
    12. }
    13. Connections {
    14. target: appWin.networkAccess
    15. onProgressChanged: {
    16. fileUplProgress.value = 100*uplTotal/uplPart;
    17. console.log(qsTr("Progress %1").arg(100*uplTotal/uplPart);
    18. }
    19. }
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    First error I get is with declaring the variant for the Manager in the qml. I have other variants that hold strings passed from C++, so I know it works.

    In short, what is the best way to upload a file in C++ and get the progress in my QML page?


  2. #2
    Join Date
    Jan 2006
    Graz, Austria
    Thanked 1,544 Times in 1,494 Posts
    Qt products
    Qt3 Qt4 Qt5
    Unix/X11 Windows

    Default Re: QNetworkAccessManager & QML Progress

    You QML Code looks like you have an object that is exposed to QML as "appWin" through the setContextProperty mechanism.
    And it has a property of a QObject type, with a signal processChanged() which has arguments named "uplTotal" and "uplPart".

    Can you confirm that?
    Maybe even post the relevant code?

    No idea why you need that variant property though, something unrelated to this?


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