ArcGIS Runtime Offline Mapping using qt c++ widgets

KailashSubramaniyan — Fri, 21 Jun 2024 10:38:37 GMT

Hello everyone,

I've developed an application in Qt using the ArcGIS Runtime SDK. While the application functions well in online mode, I now require it to operate offline.

After conducting some research on offline mapping, I began constructing the application using the guidance provided in this reference: https://developers.arcgis.com/qt/cpp/sample-code/generate-offline-map/ .

I have successfully executed the application and observed several files generated in the designated location. However, I am uncertain whether these files are the correct ones for offline map functionality (please see the attached screenshot of the folder contents).

I have included my code for your review. Kindly advise on any mistakes I may have made.

Additionally, the sample code appears to only support creating offline maps for specific geometries (extents). Is it feasible to display/load maps offline based on regions or to encompass entire countries, incorporating both raster and vector files?

I am working with ArcGIS Free Developer License. Will offline mode works with ArcGIS Free License?

Thank you!

// H FILES #ifndef OFFLINE_MAP_GENERATION_H #define OFFLINE_MAP_GENERATION_H #include <QWidget> #include <QTemporaryDir> #define DELHI_LAT 28.7041 #define DELHI_LON 77.1025 #define BENGALURU_LAT 12.9716 #define BENGALURU_LON 77.5946 #define CHENNAI_LAT 13.0843 #define CHENNAI_LON 80.2705 namespace Esri::ArcGISRuntime { class Map; class MapGraphicsView; class Portal; class PortalItem; class OfflineMapTask; class Basemap; class PortalItem; class Portal; class Error; class GenerateOfflineMapJob; class GenerateOfflineMapParameters; class Envelope; class Viewpoint; class SpatialReference; class Point; class GeometryEngine; } // namespace Esri::ArcGISRuntime namespace Ui { class offline_map_generation; } class offline_map_generation : public QWidget { Q_OBJECT public: explicit offline_map_generation(QWidget *parent = nullptr); ~offline_map_generation(); private slots: void slot_portal_error(const Esri::ArcGISRuntime::Error& error); void slot_portal_item_error(const Esri::ArcGISRuntime::Error& error); void onGenerateOfflineMapParametersCompleted(const QUuid& taskId, const Esri::ArcGISRuntime::GenerateOfflineMapParameters& parameters); void slot_map_offline_generator_job_has_error(const Esri::ArcGISRuntime::Error& error); void slot_offline_map_generator_error_occured(const Esri::ArcGISRuntime::Error& error); void on_pushButton_offlinemap_clicked(); private: Ui::offline_map_generation *ui; QString m_WebMapID; Esri::ArcGISRuntime::Map *m_map = nullptr; Esri::ArcGISRuntime::MapGraphicsView *m_mapView = nullptr; Esri::ArcGISRuntime::OfflineMapTask *m_OfflineMapTask; Esri::ArcGISRuntime::PortalItem *m_PortalItem; Esri::ArcGISRuntime::Portal *m_Portal; Esri::ArcGISRuntime::GenerateOfflineMapJob *m_offline_generator_job; QTemporaryDir m_tempPath; void generate_offline_map(); }; #endif // OFFLINE_MAP_GENERATION_H

// CPP #include "offline_map_generation.h" #include "ui_offline_map_generation.h" #include "Map.h" #include "MapGraphicsView.h" #include "PortalItem.h" #include "Portal.h" #include "OfflineMapTask.h" #include "Error.h" #include "GenerateOfflineMapJob.h" #include "GenerateOfflineMapParameters.h" #include "Viewpoint.h" #include "TaskWatcher.h" #include "SpatialReference.h" #include "Point.h" #include "Envelope.h" #include "GeometryEngine.h" using namespace Esri::ArcGISRuntime; offline_map_generation::offline_map_generation(QWidget *parent) : QWidget(parent) , ui(new Ui::offline_map_generation) { ui->setupUi(this); m_WebMapID = "0807d723aa8e41428319524e75148522"; bool loginRequired = false; m_Portal = new Portal(loginRequired, this); m_Portal->load(); m_PortalItem = new PortalItem(m_Portal, m_WebMapID, this); connect(m_Portal, &Esri::ArcGISRuntime::Portal::errorOccurred, this, &offline_map_generation::slot_portal_error); connect(m_PortalItem, &Esri::ArcGISRuntime::PortalItem::errorOccurred, this, &offline_map_generation::slot_portal_item_error); m_map = new Map(m_PortalItem, this); m_mapView = new MapGraphicsView(); m_mapView->setMap(m_map); m_OfflineMapTask = new OfflineMapTask(m_map, this); ui->widget->layout()->addWidget(m_mapView); } offline_map_generation::~offline_map_generation() { delete ui; } void offline_map_generation::slot_portal_error(const Esri::ArcGISRuntime::Error& error) { qDebug()<<"Portal Error"; qDebug()<<"Error Type"<<error.errorType(); qDebug()<<error.message(); qDebug()<<error.additionalMessage(); } void offline_map_generation::slot_portal_item_error(const Esri::ArcGISRuntime::Error &error) { qDebug()<<"Portal Item Error"; qDebug()<<"Error Type"<<error.errorType(); qDebug()<<error.message(); qDebug()<<error.additionalMessage(); } void offline_map_generation::onGenerateOfflineMapParametersCompleted(const QUuid& taskId, const Esri::ArcGISRuntime::GenerateOfflineMapParameters& parameters) { QString Path = "D:/offline_map"; GenerateOfflineMapJob *generateJob = NULL; // Adjust as needed based on your map's scale generateJob = m_OfflineMapTask->generateOfflineMap(parameters, Path); if(generateJob == NULL) { qDebug()<<"Offline Map is not generated"; } else { generateJob->start(); qDebug()<<"Map generated in path"<<Path; connect(generateJob, &GenerateOfflineMapJob::errorOccurred, this, &offline_map_generation::slot_map_offline_generator_job_has_error); } } void offline_map_generation::generate_offline_map() { Point corner1 = {CHENNAI_LON, CHENNAI_LAT, SpatialReference::wgs84()}; Point corner2 = {DELHI_LAT, DELHI_LON, SpatialReference::wgs84()}; const Envelope extent = Envelope(corner1, corner2); const Envelope mapExtent = geometry_cast<Envelope>(GeometryEngine::project(extent, SpatialReference::wgs84())); connect(m_OfflineMapTask, &Esri::ArcGISRuntime::OfflineMapTask::createDefaultGenerateOfflineMapParametersCompleted, this, &offline_map_generation::onGenerateOfflineMapParametersCompleted); connect(m_OfflineMapTask, &Esri::ArcGISRuntime::OfflineMapTask::errorOccurred, this, &offline_map_generation::slot_offline_map_generator_error_occured); m_OfflineMapTask->createDefaultGenerateOfflineMapParameters(mapExtent); } void offline_map_generation::on_pushButton_offlinemap_clicked() { generate_offline_map(); } void offline_map_generation::slot_map_offline_generator_job_has_error(const Esri::ArcGISRuntime::Error &error) { qDebug()<<"Error in Job"; qDebug()<<"Error Type"<<error.errorType(); qDebug()<<error.message(); qDebug()<<error.additionalMessage(); } void offline_map_generation::slot_offline_map_generator_error_occured(const Esri::ArcGISRuntime::Error &error) { qDebug()<<"Error in Map Generation"; qDebug()<<"Error Type"<<error.errorType(); qDebug()<<error.message(); qDebug()<<error.additionalMessage(); }

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ArcGIS Runtime Offline Mapping using qt c++ widgets