topic Re: QT Location Plugin in Qt Maps SDK Questions

QT Location Plugin

DevalGupta — Thu, 01 Jun 2023 18:22:46 GMT

Hello,

I am trying to use the QT Quick Example project for a minimal map and it is not working with the esri plug in. I remember using it almost a year ago and it was working. I know the map code is working since I can use the osm plug in successfully. I have tried with my API key, and without. Since I am just trying to show a map I don't think I even need the API key.

I have tried the two following approaches.

Plugin { id: mapPlugin name: "esri" PluginParameter { name: "esri.token"; value: "my-api-key" } }

And

Plugin { id: mapPlugin name: "esri" }

Can someone provide help why this is not working. I am using QT 5 and this specific example:

https://doc.qt.io/qt-5/qtlocation-minimal-map-example.html

Re: QT Location Plugin

JamesBallard1 — Thu, 01 Jun 2023 19:50:37 GMT

Hi @DevalGupta . I did a quick test on macOS and it worked for me, but I did not specify any PluginParameters.

As a starting point, see if you can get a map loading with that alone.

Here are more details about the "esri" plugin: https://doc.qt.io/qt-5/location-plugin-esri.html. This will provide more details on what is required.

It is worth mentioning that the "esri" Qt location provider has not be ported to Qt 6, so you'll be limited to working with Qt 5.

Re: QT Location Plugin

DevalGupta — Thu, 01 Jun 2023 20:02:29 GMT

I am running on linux, and my code looks the exact same and it is not working.

Re: QT Location Plugin

JamesBallard1 — Fri, 02 Jun 2023 18:29:37 GMT

@DevalGupta I tried on Linux and I get the same thing.

I checked the network requests and this logic is using the older, non-https endpoints by default. For example this request goes out for a map tile:

http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/15/9530/17362

ArcGIS Online returns a 301 redirect for the https endpoint version and that works fine on macOS. I don't know for certain, but I suspect there could be a problem with the SSL configuration on Linux with Qt 5 since that would be required for the https tile endpoints, or the networking is getting tripped up by the 301 redirect. I suspect the SSL issue.

I hope this is helpful even if I wasn't able to fully get to the bottom of the issue.

Re: QT Location Plugin

pattan — Thu, 06 Jun 2024 21:07:27 GMT

@DevalGupta @JamesBallard1 I faced a similar problem. Esri returns "no error" code but no maptile/map shown at all. I am using Linux with Qt5.15.x ( where x=.2, .8, .10, .14). I changed to several QtLocation versions and replace the plugins but I still got the empty map as DevalGupta. I am not sure if I roll back to older Qt and it would work. I tested on Qt6.4 and it seems the other map plugins apart from OSM don't work at all. Any suggestion on this issue would be very much appreciated.