qrc:/mainQml.qml:4:1: module "QmlApp" is not installed

[Diego Iastrubni]

I am trying to build a AppImage for my Qt6 app. It uses internally QML. When I run it I get this error:

qrc:/mainQml.qml:4:1: module "QmlApp" is not installed 

For what I understand, the QML runtime is not properly installed on the AppImage - which should be installed.

My CMake has qt_add_qml_module (this should deploy on install, no?).

The script I use to create the AppImage is this:

cmake -S . -B cbuild -G Ninja -DCMAKE_BUILD_TYPE=Release 
cmake --build cbuild
cmake --install cbuild --prefix=`pwd`/cbuild/AppDir/usr/
# failed experiment - this does not help
cp -r $QT_DIR/qml `pwd`/cbuild/AppDir/usr/

cd cbuild
wget --no-verbose "https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage"
wget --no-verbose "https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage"

chmod +x linuxdeploy*.AppImage
export OUTPUT=PassSimpleQt-x86_64.AppImage
export LD_LIBRARY_PATH=AppDir/usr/lib/:$LD_LIBRARY_PATH
#export DEBUG=1
./linuxdeploy-x86_64.AppImage --appdir AppDir --plugin qt --output appimage

What am I missing?

Edit - relevant part of CMakeLists.txt:

qt_add_qml_module(pass-simple
    URI MainQml
    VERSION 1.0
    SOURCES
        mainqmltype.h mainqmltype.cpp
        GpgIdManageType.h GpgIdManageType.cpp
        UiGuard.h UiGuard.cpp
        InputType/totp.h
        InputType/totp.cpp
        InputType/Base32.h
        InputType/Base32.cpp
        InputType/Clock.h
        InputType/Clock.cpp
  AppSettings.cpp AppSettings.h
        # hygen srcs
    QML_FILES mainQml.qml
)

[A Former User]

hi can you please copy/paste the full qt_add_qml_module from your CMakeLists.txt ?

[Diego Iastrubni]

@ankou29666 I edited the main question.

[Diego Iastrubni]

bumping this up,in case anyone knows the answer

[JKSH]

@Diego-Iastrubni said in qrc:/mainQml.qml:4:1: module "QmlApp" is not installed:

I edited the main question.

I don't see any module called QmlApp in your CMakeLists.txt

[Diego Iastrubni]

@JKSH thanks, that oviously was a start..
I have inside this app, a sub directory which contains:

qt6_add_qml_module(QmlApp
        URI QmlApp
        VERSION 1.0
        SOURCES
...

OK - lets try and install it. I added at the end:

install(TARGETS QmlApp
    BUNDLE DESTINATION .
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})

Still no go. I added to my build shell script:

cp -r QmlApp/*.qml  `pwd`/cbuild/AppDir/usr/qml/QmlApp/

This still does not work. I looked at the documentation (https://doc.qt.io/qt-6/cmake-build-reusable-qml-module.html ) and it does not explain how/where to install QML modules.

I found this example, which (IMHO) shows that "I am doing the correct thing". So, I am kinda lost...

https://github.com/4rtzel/cmake-qml-plugin-example/blob/master/plugins/my/plugin/example/CMakeLists.txt

[JKSH]

@Diego-Iastrubni said in qrc:/mainQml.qml:4:1: module "QmlApp" is not installed:

OK - lets try and install it.

My suggestion: Don't install it manually.

And definitely don't cp the files manually. Rather, let qt_add_qml_module() auto-generate the required files and put everything in the right place.

1. In your subdirectory's CMakeLists.txt, add the STATIC keyword to qt6_add_qml_module(QmlApp ...) to generate a static library.
2. In your top-level CMakeLists.txt, add add_subdirectory(QmlApp) to build the static library together with your main app
3. In your top-level CMakeLists.txt, add target_link_libraries(pass-simple PRIVATE QmlAppplugin) to link to the static library.

This way, your QML module is embedded directly inside your application and gets auto-initialized.

P.S. What version of Qt are you using? The upcoming Qt 6.5 makes some changes to the default QML resource paths

I found this example, which (IMHO) shows that "I am doing the correct thing". So, I am kinda lost...
https://github.com/4rtzel/cmake-qml-plugin-example/blob/master/plugins/my/plugin/example/CMakeLists.txt

That example is very low-level, and is not very suitable for QML modules.

[Diego Iastrubni]

my top level cmake contains:

add_subdirectory(QmlApp)
...
qt_add_qml_module(pass-simple
    URI MainQml
    VERSION 1.0
    SOURCES
        mainqmltype.h mainqmltype.cpp
        GpgIdManageType.h GpgIdManageType.cpp
        UiGuard.h UiGuard.cpp
        InputType/totp.h
        InputType/totp.cpp
        InputType/Base32.h
        InputType/Base32.cpp
        InputType/Clock.h
        InputType/Clock.cpp
        AppSettings.cpp AppSettings.h
    QML_FILES mainQml.qml
)

target_link_libraries(pass-simple PRIVATE
    Qt::Widgets
    Qt::QuickWidgets
    Qt6::Concurrent
    Qt6::LabsFolderListModel
    QmlApp
    EditYaml
    InputType
    DropdownWithList
    Datetime
    libpgpfactory
    yaml-cpp
)

Then my QmlApp/CMakeLists.txt contains:

qt6_add_qml_module(QmlApp
        URI QmlApp
        VERSION 1.0
        STATIC
        SOURCES
            QmlAppType.h 
....

install(TARGETS QmlApp
    BUNDLE DESTINATION .
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})

Still the same error on runtime. I can also see the same error when I run from the command line - without QtCreator.

[JKSH]

Sorry for the delay.

@Diego-Iastrubni said in qrc:/mainQml.qml:4:1: module "QmlApp" is not installed:

my top level cmake contains:

add_subdirectory(QmlApp)
...
target_link_libraries(pass-simple PRIVATE
    ...
    QmlApp
    ...
)

Link to QmlAppplugin instead of QmlApp

Still the same error on runtime. I can also see the same error when I run from the command line - without QtCreator.

I asked for the version of Qt that you're using, but didn't get an answer. Anyway, see https://www.qt.io/blog/whats-new-for-qml-modules-in-6.5 -- Use Qt 6.5, add qt_standard_project_setup(REQUIRES 6.5) to your top-level CMakeLists.txt and call engine.loadFromModule() instead of engine.load()