topic Re: Export Tiles from built-in basemap in ArcGIS Runtime in Qt Maps SDK Questions

Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Tue, 19 Sep 2017 17:10:51 GMT

Hi!

I would like to save a predefined area of interest of a MapView that can be loaded when there is no network connection. I tried following the ArcGIS Samples for "ExportTiles" but it keeps failing. I am not sure what the correct solution would be, but perhaps someone could provide the steps I should follow to export the map tiles.

Thank you!

Nick

Re: Export Tiles from built-in basemap in ArcGIS Runtime

LukeSmallwood — Wed, 20 Sep 2017 10:12:46 GMT

Hi Nicholas - which online basemap are you trying to export with? If you are using the standard base maps you will find that they do not support exporting tile packages. However, you can use the maps defined in this group instead:

http://www.arcgis.com/home/group.html?id=3a890be7a4b046c7840dc4a0446c5b31#overview

I hope that helps,

Luke

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Wed, 20 Sep 2017 12:38:13 GMT

Okay I will use those. How do I access them from within the Runtime? I've tried copying the given URL and I keep getting an error message saying that there was an invalid token or unable to generate token

Re: Export Tiles from built-in basemap in ArcGIS Runtime

LukeSmallwood — Wed, 20 Sep 2017 13:43:26 GMT

Hi Nicholas,

For exporting tiles from these services you will need to authenticate with an arcgisonline account.

This guide topic Access the ArcGIS platform—ArcGIS Runtime SDK for Qt | ArcGIS for Developers should give you some idea of how to go about authenticating your app. You probably want to look at the AuthenticationManager section. The API reference for that type (AuthenticationManager Class | ArcGIS for Developers ) also has some useful information.

Basically, you need to respond to the request for a token with some credentials - using the AuthenticationManager (singleton) with an AuthenticationView qml component will give you a sign in experience.

Does that make sense?

One question I had is whether this is a one time export (e.g. to prepare the data) or if this is something you would like your app to do ever time it runs?

I hope that helps,

Luke

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Wed, 20 Sep 2017 13:57:55 GMT

Thank you! I will look into this and try to get it working.

To answer your question, I would like users to have the option to save the current view of the map for offline use at any time. For example, say you wanted to use the application in an area without network connection. The user could find that area and export it sometime before travelling to the area without internet. Does that make sense?

Re: Export Tiles from built-in basemap in ArcGIS Runtime

LukeSmallwood — Wed, 20 Sep 2017 14:00:48 GMT

Hi Nicholas, that makes sense to me. You may also want to check out the OfflineMapTask (OfflineMapTask Class | ArcGIS for Developers ) for that workflow.

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Wed, 20 Sep 2017 14:03:26 GMT

Will do, I will let you know how this works out

Thanks!

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Wed, 20 Sep 2017 15:11:36 GMT

Hi again Luke,

I followed the guide for Authentication Manager and Authentication View setup in both the C++ and QML, but now I keep getting a strange error:

file:///C:/Program Files (x86)/ArcGIS SDKs/Qt100.1/sdk/toolkit/Import/Esri/ArcGISRuntime/Toolkit/Dialogs/AuthenticationView20.qml:105:5: QML Connections: Cannot assign to non-existent property "onAuthenticationChallenge"

which is then followed by

file:///C:/Program Files (x86)/ArcGIS SDKs/Qt100.1/sdk/toolkit/Import/Esri/ArcGISRuntime/Toolkit/Dialogs/AuthenticationView20.qml:106:17: Unable to assign [undefined] to QObject*

These both take me to the ArcGIS defined AuthenticationView QML file, and I can't seem to figure out why the signal does not properly display the view. I'm fairly sure that it is receiving the correct signal for a username/password. Am I missing some steps to handle the signal? I have registered the AuthenticationView and set it up following the sample on the ArcGIS Github

Re: Export Tiles from built-in basemap in ArcGIS Runtime

LukeSmallwood — Wed, 20 Sep 2017 15:31:17 GMT

Hi Nicholas, have you registered the `AuthenticationManager` as a singleton and exposed it as a property from C++?

If you are able to share some of your code I may be able to see if there is a problem

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Wed, 20 Sep 2017 15:58:11 GMT

How do you register it as a singleton? I have declared it as a property from C++ following the example in ArcGISSamples->Cloud and Portal->Token Authentication

As of now the code is large and complex, but the part that deals with this topic is almost identical to that of the sample I mentioned above, save for a few variable names.

Re: Export Tiles from built-in basemap in ArcGIS Runtime

LukeSmallwood — Wed, 20 Sep 2017 16:00:31 GMT

You would need to register it (probably in your main.cpp) for QML - something like this:

qmlRegisterUncreatableType<AuthenticationManager>("Esri.MyApp", 1, 0, "AuthenticationManager", "AuthenticationManager is uncreateable");

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Sun, 12 Dec 2021 16:44:55 GMT

Yes I have done this. Maybe I am defining the AuthenticationView incorrectly in the QML?

My setup is structured similar to this:

MyApp {

    id: myapp
    // other properties
       AuthenticationView {
        anchors.fill: parent
        authenticationManager: myapp.authManager
    }
    // Other QML Items (MapView, Rectangles, etc)
}

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Wed, 20 Sep 2017 16:09:54 GMT

Where authManager is the READ function of a Q_PROPERTY defined in my myapp.cpp file to return AuthenticationManager::instance()

Re: Export Tiles from built-in basemap in ArcGIS Runtime

LukeSmallwood — Wed, 20 Sep 2017 16:19:02 GMT

Its hard to tell without seeing all of the code - but it looks to me as though the property has not notified QML that the authManager is ready yet. Do you have a signal that you emit in the c'tor of your type to show that the property (the singleton) has changed? Or is the property marked CONSTANT?

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Wed, 20 Sep 2017 16:23:20 GMT

The property is marked as CONSTANT like how the sample does it. Do I need to connect a signal in the QML for when the singleton has changed?

Re: Export Tiles from built-in basemap in ArcGIS Runtime

LukeSmallwood — Wed, 20 Sep 2017 16:26:28 GMT

You shouldn't need to I don't think. Maybe you can try printing console.log(myApp.authManager) when the apps Component.onComplete event occurs to see what it displays?

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Sun, 12 Dec 2021 16:44:58 GMT

I have a setup within the myapp.cpp file to identify and handle the different types of challenges without the QML view (this block was made following the topic article you mentioned above). But it refuses to accept my login credentials and gives an error message saying "Token required"
Any thoughts why that would be happening?

QMetaObject::Connection connection = connect(AuthenticationManager::instance(), &AuthenticationManager::authenticationChallenge, this, [this](AuthenticationChallenge* challenge){

        switch(challenge->authenticationChallengeType()){

            case AuthenticationChallengeType::UsernamePassword:

                challenge->continueWithUsernamePassword(userName, password);

                std::cout << "Needs username and password" << std::endl;

                break;

            case AuthenticationChallengeType::OAuth:

                // continueWithOAuthAuthorizationCode

                std::cout << "Needs OAuth" << std::endl;

                break;

            case AuthenticationChallengeType::ClientCertificate:

                // continueWithClientCertificate

                std::cout << "Needs client certificate" << std::endl;

                break;

            case AuthenticationChallengeType::SslHandshake:

                // continueWithSslHandshake

                std::cout << "Needs SSL handshake" << std::endl;

                break;

            case AuthenticationChallengeType::Unknown:

                std::cout << "Unknown challenge" << std::endl;

                break;

});

The cause of the AuthenticationChallenge I believe is this:

QUrl serviceUrl_ = QUrl("https://tiledbasemaps.arcgis.com/arcgis/rest/services/World_Imagery/MapServer");

p_ExportTask_ = new ExportTileCacheTask(serviceUrl_, this);

connect(p_ExportTask_, &ExportTileCacheTask::doneLoading, this, [this](Error error){

        if(!error.isEmpty()){

            std::cout << "Load error: " << error.message().toStdString() << std::endl;

});
p_ExportTask_->load();

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Wed, 20 Sep 2017 19:08:38 GMT

Luke,

So it seems that I am able to catch the AuthenticationChallenge with the code below (which in my case is consistently the need for a username/password), but when I provide credentials (my username/password for my ArcGIS Developer account) I receive an error saying "unable to generate token". I am trying to get access to the portal "https://tiledbasemaps.arcgis.com" (the group of basemaps for export that you provided), but am consistently unable to get access.

My underlying need is to be able to press a button on the UI that will call a method to export the current view of the map to a .tpk file which can then be loaded another time. I believe the tiledbasemaps group has the right data for this, but I can't seem to figure out how to provide the right credentials to access them. My thought is to create a Portal linked to my developer account and to log in that way so that the map already has the correct credentials, but this doesn't seem to be working.

Any advice for a different approach or how to generate a valid token from within the Runtime?

Thank you,

Nick

Re: Export Tiles from built-in basemap in ArcGIS Runtime

LukeSmallwood — Thu, 21 Sep 2017 15:44:40 GMT

Hi Nicholas - I think there may be an issue with logging in using the workflow you describe (I will log an issue to look into that). Here is some workaround code that will first authenticates using a portal - this works for me, so hopefully it should solve your problem.

void ExportTiles::componentComplete()

  QQuickItem::componentComplete();

  // create Portal and load

  Portal* portal = new Portal(QUrl("https://arcgis.com"), true, this);

  connect(portal, &Portal::doneLoading, this, [this](Error e)

    if (!e.isEmpty())

      qDebug() << e.message() << e.additionalMessage();

    else

      qDebug() << "portal loaded";

});

  //portal->load(); // this will trigger an authentication challenge for AGOL credentials

  // find QML MapView component

  m_mapView = findChild<MapQuickView*>("mapView");

  // create a tiled basemap

  ArcGISTiledLayer* tiledLayer = new ArcGISTiledLayer(m_serviceUrl, this);

  Basemap* basemap = new Basemap(tiledLayer, this);

  // create a new map instance

  m_map = new Map(basemap, this);

  // set an initial viewpoint

  Envelope env(11257744, 1682070, 11259005, 1683016, SpatialReference(3857));

  Viewpoint viewpoint(env);

  m_map->setInitialViewpoint(viewpoint);

  // set map on the map view

  m_mapView->setMap(m_map);

  // create the task with the url and load it

  m_exportTileCacheTask = new ExportTileCacheTask(m_exportUrl, this);

  connect(m_exportTileCacheTask, &ExportTileCacheTask::doneLoading, this, [this](Error error)

    if (!error.isEmpty())

      emit updateStatus("Export failed");

      emit hideWindow(5000, false);

});

  connect(m_mapView, &MapQuickView::viewpointChanged, this, [this]()

    qDebug() << m_mapView->currentViewpoint(ViewpointType::BoundingGeometry).targetGeometry().toJson();

});

The rest of your code should work as is hopefully - please let me know if this is working for you!

Luke

Re: Export Tiles from built-in basemap in ArcGIS Runtime

NicholasLiccini — Thu, 21 Sep 2017 16:09:05 GMT

Luke,

Thank you for the sample code. I have integrated that into what I have but still no luck. Just to be clear, your code should try to create the basemap, then throw an AuthenticationChallenge which would then be picked up by the AuthenticationView in the QML where you can log in and the basemap would then load, correct?

As of now, my issue is that the AuthenticationView will not create properly, and it keeps giving me the same two errors:

file:///C:/Program Files (x86)/ArcGIS SDKs/Qt100.1/sdk/toolkit/Import/Esri/ArcGISRuntime/Toolkit/Dialogs/AuthenticationView20.qml:106:17: Unable to assign [undefined] to QObject*

If this issue with the AuthenticationView is solved, I should be able to enter in my ArcGIS Developer credentials and the map would load, correct?

Thanks for all the help!

Nick