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OverviewFelgo 4 Support (Qt 6) › Issue with Running Application with Custom C++ Code

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  • #25328


    Hello everyone!

    I’m having trouble running an application that contains custom C++ code. I’m following the documentation and examples, but I still encounter errors during compilation.

    Here’s how my main.cpp looks like:


    #include "apimanager.h"
    #include <QGuiApplication>
    #include <QQmlContext>
    #include <QQmlApplicationEngine>
    #include <FelgoLiveClient>
    int main(int argc, char *argv[])
        QGuiApplication app(argc, argv);
        QQmlApplicationEngine engine;
        ApiManager apiManager;
        engine.rootContext()->setContextProperty("apiManager", &apiManager);
        const QUrl url(u"qrc:/UserLoginApiTest/main.qml"_qs);
        QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                         &app, [url](QObject *obj, const QUrl &objUrl) {
            if (!obj && url == objUrl)
        }, Qt::QueuedConnection);
        FelgoLiveClient liveClient(&engine);
        return app.exec();

    Unfortunately, during compilation, I’m getting the following errors:

    :-1: błąd: CMakeFiles/appUserLoginApiTest.dir/appUserLoginApiTest_autogen/mocs_compilation.cpp.obj: in function `QtPrivate::QMetaTypeForType<ApiManager>::getDefaultCtr()::{lambda(QtPrivate::QMetaTypeInterface const*, void*)#1}::operator()(QtPrivate::QMetaTypeInterface const*, void*) const’:

    C:\Felgo\Felgo\mingw_64\include\QtCore\qmetatype.h:2299: błąd: undefined reference to `ApiManager::ApiManager(QObject*)’

    :-1: Error: CMakeFiles/appUserLoginApiTest.dir/main.cpp.obj: in function `qMain(int, char**)’:

    C:\Users\veltr\Desktop\UserLoginApiTest\main.cpp:15: błąd: undefined reference to `ApiManager::ApiManager(QObject*)’


    I’ve just updated my CMakeLists.txt to include the necessary source files, but the problem persists. Additionally, I’ve included #include <FelgoLiveClient> and created a FelgoLiveClient object at the end of main.cpp, as suggested by the documentation.

    Has anyone encountered a similar issue? Or does anyone have any ideas on how to resolve it?

    Thanks in advance for any help!



    Now i;ve got the problem:

    C:\Users\veltr\Desktop\UserLoginApiTest\CMakeLists.txt:9: błąd: By not providing “FindFelgoLive.cmake” in CMAKE_MODULE_PATH this project
    has asked CMake to find a package configuration file provided by
    “FelgoLive”, but CMake did not find one.

    Could not find a package configuration file provided by “FelgoLive” with
    any of the following names:


    Add the installation prefix of “FelgoLive” to CMAKE_PREFIX_PATH or set
    “FelgoLive_DIR” to a directory containing one of the above files. If
    “FelgoLive” provides a separate development package or SDK, be sure it has
    been installed.



    After successfully running the application locally without encountering any issues, I’m now exploring the possibility of running the application with its native C++ code on Felgo DevApp. However, I’ve noticed that when attempting to do so, the functionality on the phone doesn’t seem to work as expected.


    If its not possible, do u know a way to test the whole app on ios phone directly (in a way that C++ native code works) ?


    Felgo Team

    Hi Filmixyy,

    C++ code requires compilation and can not be reloaded with Felgo Live at runtime. This means that the pre-built Desktop Live Client and Mobile Dev App can not use any custom C++ code of your project.

    However, you can still use Felgo Live by integrating the Felgo Live Module and compiling your project (which will then also include your custom C++ code). This is what the FelgoLiveClient code in the main.cpp is for. You can learn more here: https://felgo.com/doc/qml-hot-reload-felgo-live/#c-native-code-build-your-own-live-clients-with-the-felgo-live-module

    You can create both a Desktop and Mobile client this way. For compiling Felgo projects on mobile platforms, you can follow the steps in the deployment guide: https://felgo.com/doc/felgo-deployment-ios/#add-felgo-packages-for-ios-platform


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