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How to access QList of struct members in qml



  • Hi,
    I need to know how to acess the members of struct from qlist in qml.

    Currently i can acess only the members of struct in qml and i am also able to acess simple qlist i.e. Qlist made of qString.

    But the problem starts when i try to acess the members of struct embedded in qlist.

    I have created a struct (MyStruct) in c++ and can acscess it in Qml. I can also acess QList ( which is QStrinList).

    But problem comes when i am trying to access QList. it gives me the error

    qrc:/OrderBar.qml:26: TypeError: Cannot read property 'name1' of undefined
    

    the Codes are

    QML

    Text{
            //text: myModel2.mystr.name1  // this works
            text: myModel2.lstr[0].name1
            y: sensor.width + 5
            font.family: "Helvetica"
            font.pointSize: 10
            anchors.horizontalCenter: parent.horizontalCenter
        }
    

    C++

    test.h

    #ifndef TEST_H
    #define TEST_H
    
    #include <QObject>
    
    struct MyStruct {
        Q_GADGET
       // Q_OBJECT
        int m_val;
    
    public:
        QString m_name1;
        QString m_name2;
        QString m_name3;
        QString m_name4;
        Q_PROPERTY(int val MEMBER m_val)
        Q_PROPERTY(QString name1 MEMBER m_name1)
        Q_PROPERTY(QString name2 MEMBER m_name2)
        Q_PROPERTY(QString name3 MEMBER m_name3)
        Q_PROPERTY(QString name4 MEMBER m_name4)
    };
    
    Q_DECLARE_METATYPE(MyStruct);
    
    class test : public QObject
    {
        Q_OBJECT
        Q_PROPERTY(MyStruct mystr READ getMyStruct
                   WRITE setMyStruct NOTIFY myStructChanged)
    
        Q_PROPERTY(QList<MyStruct> lstr READ getLstr
                   WRITE setLstr NOTIFY lstrChanged)
    
    public:
        explicit test(QObject *parent = nullptr);
    
    
        MyStruct strObj;
    
        MyStruct getMyStruct() const
        {
            return strObj;
        }
    
    
        void setMyStruct(MyStruct val)
        {
            strObj = val;
            emit myStructChanged();
        }
    
        QList<MyStruct> strList;
    
        QList<MyStruct>  getLstr() const
        {
            return strList;
        }
    
        void setLstr(QList<MyStruct> val)
        {
            strList = val;
            emit lstrChanged();
        }
    
    
    
    signals:
        void myStructChanged();
        void lstrChanged();
    
    public slots:
    
    };
    
    #endif // TEST_H
    

    test.cpp

    #include "test.h"
    
    test::test(QObject *parent) : QObject(parent)
    {
        MyStruct l_value;
        l_value.m_name1 = "b1";
        l_value.m_name2 = "b2";
    
        setMyStruct(l_value);
    
    
         QList<MyStruct> l_strList;
    
         l_strList.append(l_value);
    
         setLstr(l_strList);
    
    }
    


  • @Mandeep-Chaudhary

    I'm not an expert when it comes to QML but I think you need to register your struct as MetaType (Otherwise QML doesnt know about your structs structure and variables)
    Edit: I missed the Q_DECLARE_METATYPE(MyStruct);



  • this works with Qt5.14
    please upgrade your Qt version if it is possible


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