⚠️ Forum Maintenance: Feb 6th, 8am - 14pm (UTC+2)

Plugin type not recognized

  • Hi,
    I am trying to build a simple plugin with multiple components Button, Checkbox etc. But When I try to use this plugin library in an application I get error "Widget is not a Type". Also please help with importing the plugin correctly.

    Thank you,

  • Here is the file https://easyupload.io/fd9c5b

  • Lifetime Qt Champion

    @RadiumBall Please show the code where you load and use the plug-in.
    "Widget is not a Type" - this means that Widget is not known to the compiler - did you forget to include the header file where Widget is declared?

  • @jsulm Thank you very much.
    Here is my button widget

    import QtQuick 2.12
    import QtQuick.Controls 2.12
    Button {
        id: button
        /** sets Button Text visible*/
        property bool   bIsButtonTextVisible: true

    Here is my CheckBox Widget

    import QtQuick 2.0
    import QtQuick.Controls 2.12
        id :checkBox
        /** checkbox current state checked / unchecked */
        property bool checked: true

    Here is my cpp code

    #include "widgets_plugin.h"
    #include <qqml.h>
    void WidgetsPlugin::registerTypes(const char *uri)
        // @uri com.mycompany.qmlcomponents
        qmlRegisterType(QUrl("qrc:/EDSButton/Source/component/ButtonWidget.qml"), uri, 1, 0, "ButtonWidget");
        qmlRegisterType(QUrl("qrc:/EDSCheckBox/Source/component/CheckBoxWidget.qml"), uri, 1, 0, "CheckBoxWidget");

    Here is my header file

    #ifndef WIDGETS_PLUGIN_H
    #define WIDGETS_PLUGIN_H
    #include <QQmlExtensionPlugin>
    class WidgetsPlugin : public QQmlExtensionPlugin
        Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
        void registerTypes(const char *uri) override;
    #endif // WIDGETS_PLUGIN_H

    All this packaged into a library.

    Here is my application cpp

    #include <QGuiApplication>
    #include <QQmlApplicationEngine>
    int main(int argc, char *argv[])
        QGuiApplication app(argc, argv);
        QQmlApplicationEngine engine;
        const QUrl url(QStringLiteral("qrc:/main.qml"));
        QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                         &app, [url](QObject *obj, const QUrl &objUrl) {
            if (!obj && url == objUrl)
        }, Qt::QueuedConnection);
        return app.exec();

    And here is my main qml

    import QtQuick 2.9
    import QtQuick.Window 2.2
    //import "qrc:/EDSCheckBox/Source/component"
    import "C:\Users\RadiumBall\Downloads\EDSCheckBoxComponent\EDS_Component\debug\Widgets.dll"
    Window {
        width: 640
        height: 480
        visible: true
        title: qsTr("Hello World")
            id : testCheckBox
            rCheckboxConfigureHeight: 24
            rCheckboxConfigureWidth: 24
            rCheckboxConfigureRadius: 1
            rCheckboxConfigureImgHeight: 16
            rCheckboxConfigureImgWidth: 16
            sCheckBoxLabel: "CheckBox"

    I am doing two mistakes here, one is w.r.t importing the library and other complier throws me error 'CheckBoxWidget' is not a type.

    PS: The CheckBoxWidget qml works perfectly fine when included directly but fails when included as a library.

    Please help.

Log in to reply