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);
  4.  
  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.             anchors.top: 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)
  9.  
  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?

--Sam