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Showing content from https://developers.arcgis.com/qt/maps-2d/tutorials/display-a-web-map/ below:

Display a web map | ArcGIS Maps SDK for Qt

Learn how to create and display a map from a web map stored in ArcGIS.

A web map contains the definition of a map, including properties such as the basemap, initial extent, layers, styles, pop-ups, and labels. You can author and save web maps using the Map Viewer or ArcGIS Pro and share them in ArcGIS. Each web map is stored as an item in ArcGIS Online or ArcGIS Enterprise, allowing you to access a web map from a portal using its item ID and display it in your app.

In this tutorial, you use a web map's item ID to display a map of trails, trailheads and parks in the Santa Monica Mountains . The web map is hosted in ArcGIS Online.

Prerequisites

Before starting this tutorial:

You need an ArcGIS Location Platform or ArcGIS Online account.
Your system meets the system requirements.
The ArcGIS Maps SDK for Qt, version 200.8.0 or later is installed.
The Qt 6.8.2 software development framework is installed.

Note

For simplicity, the steps for the ArcGIS Maps SDK for Qt tutorials are shown for creating Windows Desktop apps on a Windows desktop computer. Qt being cross-platform, allows for the flexibility to create apps on multiple configurations, such as Android, Linux, and macOS. If you are developing a non-Windows machine, you will need to make adjustments as you work through the tutorials.

When completing the tutorials, it is recommended that following Qt Creator setting is used:

In the menu bar, choose Edit > Preferences...
In the Preferences- Qt Creator dialog, on the left choose C++
Make the Coding Style tab active
In the ClangFormat settings section, ensure the Formatting Mode is set to Use built-in indenter

Develop or Download

You have two options for completing this tutorial:

Option 1: Develop the code

To start the tutorial, complete the Display a map tutorial. This creates a map to display the Santa Monica Mountains in California using the topographic basemap from the ArcGIS Basemap Styles service.

Open a Qt Creator project

Open the project you created by completing the Display a map tutorial.
Continue with the following instructions to display a map from a web map stored in ArcGIS.

Get the web map item ID

You can use ArcGIS tools to create and view web maps. Use the Map Viewer to identify the web map item ID. This item ID will be used later in the tutorial.

Go to the LA Trails and Parks web map in the Map Viewer in ArcGIS Online. This web map displays trails, trailheads and parks in the Santa Monica Mountains.
Make a note of the item ID at the end of the browser's URL. The item ID should be
41281c51f9de45edaf1c8ed44bb10e30

Initialize the map using a web map

In Projects, double-click Sources > Display_a_map.cpp to open the file.

Remove the five classes shown. These are not needed when displaying a web map.

Display_a_map.cpp

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#include "Display_a_map.h"
#include "Map.h"

#include "MapTypes.h"

#include "MapQuickView.h"

#include "Point.h"
#include "Viewpoint.h"
#include "SpatialReference.h"
#include <QFuture>

Remove the comma after QObject(parent) and then modify the constructor to remove initialization with BasemapStyle and the Map.

Display_a_map.cpp

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Display_a_map::Display_a_map(QObject* parent /* = nullptr */):

    QObject(parent),

    m_map(new Map(BasemapStyle::ArcGISTopographic, this))

In the setupViewpoint() method, replace the existing code with the following. This code creates a QString named item_id and sets it to the item ID for the LA Trails and Parks web map. It appends the item ID to the ArcGIS Online base URL and stores it in a QUrl. The new code creates a Map from the web map configuration specified by the item ID.

Display_a_map.cpp

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MapQuickView* Display_a_map::mapView() const
{
    return m_mapView;
}

void Display_a_map::setupViewpoint()
{

    const QString item_id("41281c51f9de45edaf1c8ed44bb10e30");
    const QUrl portal_url(QString("https://arcgis.com/sharing/rest/content/items/" + item_id));
    m_map = new Map(portal_url, this);
    m_mapView->setMap(m_map);

Press Ctrl + R to run the app.

You will see a map of trails, trailheads and parks in the Santa Monica Mountains. Click, drag, and scroll the mouse wheel on the map view to explore the map.

Alternatively, you can download the tutorial solution, as follows.

Option 2: Download the solution

Click the Download solution link under Solution and unzip the file to a location on your machine.
Open the project in Qt Creator.
Note
The Configure Project window may appear for you to specify the Qt Kit to use to compile the project. If you are using ArcGIS Maps SDK for Qt (v200.7) or greater, check on the Qt Kit called Desktop Qt 6.8.2 MSVC2022 64bit before clicking the Configure Project button at the bottom of the page.

Since the downloaded solution does not contain authentication credentials, you must set up authentication to create the developer credentials and add them to the project.

Set up authentication

To access the secure ArcGIS location services used in this tutorial, you must implement API key authentication using an ArcGIS Location Platform or an ArcGIS Online account.

Create a new API key access token with privileges to access the secure resources used in this tutorial.

Complete the Create an API key tutorial and create an API key with the following privilege(s):
- Privileges
  - Location services > Basemaps
Copy and paste the API key access token into a safe location. It will be used in a later step.

Set developer credentials in the solution

To allow your app users to access ArcGIS location services, use the developer credentials that you created in the Set up authentication step to authenticate requests for resources.

In the Projects window, go to the Sources folder
Open the main.cpp file.

Modify the code to set the accessToken using your API key access token.

main.cpp

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    // 2. API key authentication: Get a long-lived access token that gives your application access to
    // ArcGIS location services. Go to the tutorial at https://links.esri.com/create-an-api-key.
    // Copy the API Key access token.

    const QString accessToken = QString("");

Save and close the file.

Best Practice: The access token is stored directly in the code as a convenience for this tutorial. Do not store credentials directly in source code in a production environment.

Run the solution

Press Ctrl + R to run the app.

You will see a map of trails, trailheads and parks in the Santa Monica Mountains. Click, drag, and scroll the mouse wheel on the map view to explore the map.

What's next?

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

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