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Qt C++ Widgets Samples

RitvikRanadive

Hi,

Are there any Qt C++ Widgets samples for -

1. Generating offline map for preplanned area and storing it locally

2. Generating offline map on-demand and storing it locally

3. Loading a stored offline map

4. Get GPS coordinates from user inputs like mouse click

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Accepted answers

LucasDanzinger

The directory with the mmap and various other files is an "unpacked" mobile map package. The constructor to MobileMapPackage takes either the path to a file with .mmpk extension or to the directory of an unpacked mobile map package. https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-mobilemappackage.html#MobileMapPackage

All comments

LucasDanzinger

We don't have specific Widgets samples for these, but we have C++ Qt Quick samples. The actual code to perform these is nearly identical (the only difference between Widgets and Qt Quick is MapQuickView and MapGraphicsView class).

Offline map on demand - https://github.com/Esri/arcgis-runtime-samples-qt/tree/main/ArcGISRuntimeSDKQt_CppSamples/Maps/GenerateOfflineMap

Preplanned offline map - https://github.com/Esri/arcgis-runtime-samples-qt/tree/main/ArcGISRuntimeSDKQt_CppSamples/Maps/DownloadPreplannedMap

Load mobile map package - https://github.com/Esri/arcgis-runtime-samples-qt/tree/main/ArcGISRuntimeSDKQt_CppSamples/Maps/OpenMobileMap_MapPackage

Get coordinates from mouse click - connect to the mouse clicked signal (https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-mapgraphicsview.html#mouseClicked) and then call screenToLocation to convert the screen point to map point https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-mapview.html#screenToLocation

RitvikRanadive

Hi @LucasDanzinger thanks for the response, I was looking for Widgets samples as I didn't want to involve QMLs. Is this actually even possible?

LucasDanzinger

Yes, it's definitely possible. The actual C++ back end code will be nearly identical. You can disregard the QML portions of the samples, as those are just the UI - you'd use Qt Widgets for your UI instead.

RitvikRanadive

Does the GenerateOfflineMap example actually create the .mmpk which the OpenMobileMap_MapPackage example requires..?

Since the GenerateOfflineMap example was generating the files in tmp, I updated the path to a different path on my drive. When I check this path after running the example, there is no .mmpk file in this path. There is a .mmap file in the one of the subdirectories but this does not work with the OpenMobileMap_MapPackage example.

What am I doing wrong here?

LucasDanzinger

The data is available for download on ArcGIS Online. Details are in the sample readme - https://github.com/Esri/arcgis-runtime-samples-qt/tree/main/ArcGISRuntimeSDKQt_CppSamples/Maps/OpenMobileMap_MapPackage#offline-data

RitvikRanadive

Hi, the details from the sample readme file are only for the Yellowstone map that is in the example. How can I generate this .mmpk file for any other map that I have created on my account in Map Viewer?

RitvikRanadive

Hi @LucasDanzinger

Please correct me if I am wrong but I need to have ArcGIS Pro in order to create an .mmpk file for a map that I have created?

LucasDanzinger

You can create a MMPK in Pro.

You can also generate one on-demand from a web map using our OfflineMapTask. This sample demonstrates how to do this https://github.com/Esri/arcgis-runtime-samples-qt/tree/main/ArcGISRuntimeSDKQt_CppSamples/Maps/GenerateOfflineMap

RitvikRanadive

yeah but the on demand web map using the OfflineMapTask gets deleted after the program exits, I would like to store the maps in a location on my hard drive from where I can load them completely offline at a later point.

LucasDanzinger

The sample itself deletes the mmpk on exit by use QTemporaryDir. If you modify it to output to a different non-temp location, it won't be deleted.

RitvikRanadive

Are you sure? As I have already tried providing a different path in the following line of code in GenerateOfflineMap.cpp of the example:

GenerateOfflineMapJob* generateJob = m_offlineMapTask->generateOfflineMap(params, "/home/mypath/" + "/offlinemap");

It generated the files at the specified path but there was no .mmpk file in this.
There was mobile_map.mmap file in this but this does not work with the OpenMobileMapPackage example.

LucasDanzinger

RitvikRanadive

ah i see! thanks a lot for all your help! we can close this one now...

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