QML Plugin Load Error

Rangantha B V

I am working on a Qt 6 project that contains both a QML plugin (built with qt_add_qml_module) and a shared C++ library. I want to use the shared library’s classes inside plugin and this plugin will expose .qml files .
i will use this plugin qml files in my application this is what i need to achive but i am facing an error.

target_link_libraries

using a above line i linked librray to plugin.
But when i try to use the plugin in other aplication i am getting below error.

QQmlApplicationEngine failed to load component
qrc:/main.qml:3:1: Cannot load library D:\MyWorkspace\MyPluginLoader\build\Desktop_Qt_6_9_1_MinGW_64_bit-Debug\bin\WeinigComponentsExtPluginplugin\WeinigComponentsExtPluginpluginplugin.dll: The specified module could not be found.

but in aplication when i load a library using QLibrary and then trying to use plugin the application is launching and it works fine.
insted of loading libabry if i try to load plugin i am facing this issue .

Redman

Please post the relevant parts of your CMakeLists and main.qml.

JKSH

@Rangantha-B-V said in QML Plugin Load Error:

Cannot load library D:\MyWorkspace\MyPluginLoader\build\Desktop_Qt_6_9_1_MinGW_64_bit-Debug\bin\WeinigComponentsExtPluginplugin\WeinigComponentsExtPluginpluginplugin.dll: The specified module could not be found.

This usually means: One or more of the dependencies of WeinigComponentsExtPluginpluginplugin.dll is not in your PATH or your executable's folder.

Rangantha B V

@Redman this is my plugin cmake .


cmake_minimum_required(VERSION 3.16)

project(MyDbsComponents VERSION 0.1 LANGUAGES CXX)

set(CMAKE_AUTOMOC ON)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(QT_QML_OUTPUT_DIRECTORY  ${CMAKE_BINARY_DIR})

find_package(Qt6 6.2 COMPONENTS Quick REQUIRED)
find_package(Qt6 REQUIRED COMPONENTS Core)
find_package(Qt6 REQUIRED COMPONENTS Core)

qt_add_library(MyDbsComponents SHARED)
qt_add_qml_module(MyDbsComponents
    URI com.pthinks.dbcomponents
    VERSION 1.0
    # QML_FILES MyItemControls.qml
    SOURCES MyItem.cpp MyItem.h
     DbsComponentsPlugin.h DbsComponentsPlugin.cpp
    # QML_FILES DbsCheckBoxValue.qml
     Person.h Person.cpp
    RESOURCES qml.qrc
)

set_target_properties(MyDbsComponents PROPERTIES
    MACOSX_BUNDLE_GUI_IDENTIFIER my.example.com
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
    MACOSX_BUNDLE TRUE
    # WIN32_EXECUTABLE TRUE
)

target_compile_definitions(MyDbsComponents
    PRIVATE $<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:QT_QML_DEBUG>)
target_link_libraries(MyDbsComponents
    PRIVATE Qt6::Quick)
target_link_libraries(MyDbsComponents PRIVATE Qt6::Core)
target_link_libraries(MyDbsComponents PRIVATE Qt6::Core)

target_include_directories(MyDbsComponents PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
# target_link_libraries(MyDbsComponents PRIVATE Qt6::Quick Qt6::Core Qt6::Qml)

in my application i am linking like this

engine.addImportPath("D:\\rangaWorkspace\\MyDbsComponents\\build\\Desktop_Qt_6_9_1_MinGW_64_bit-Debug");

and i ma not addor modify anything in my appliaction CMake
and in main.qml i am trying to import like this

import com.pthinks.dbcomponents 1.0

Rangantha B V

@JKSH in top i shred my plugin cmake please refer and tell me if anything i missed .
when ever i try to build a plugin it will create folder inside the build directory and followed by the uri "com.pthinks.dbcomponents" .
when i load my apliaction and using a path upto the build directory and if i run my appliaction it will give me an above error.
is any .dll i need to explictly copy and paste inside "dbcomponts" folder or is this enough.

JKSH

@Rangantha-B-V Please check that all the dependencies of WeinigComponentsExtPluginpluginplugin.dll are either in your PATH or in your executable's folder.

You can use https://github.com/lucasg/Dependencies to see what dependencies/DLLs it needs.

Rangantha B V

I Got the solution to this problem .
we need to add System Environment path.
like where that .dll are present upto that we need to specify .

dheerendra

https://forum.qt.io/topic/158541/windows-qt_add_qml_module-failed-to-load-the-plugin
This may help