QML : Error: Unknown method return type: QList<QStringList>

[Iheb]

Hello, I have a function in Qt that returns QList<QStringList> object and I'm using it in a QML file. The compilation is fine. However, when executing it the QML throws this error : Unknown method return type: QList<QStringList>. Please help.

[sierdzio]

You need to register this type using Q_DECLARE_METATYPE. Also you'll probably need to use qRegisterType(), but I'm not sure. Look it up in the documentation.

[Iheb]

Thank you for the reply. I tried different things but no success. Can you please give me an example?

[LeLev]

@Iheb hi
you can return a QVariant instead of QList<QStringList>

   Q_INVOKABLE QVariant getlistOfLists(){
        
        QList<QStringList> listOfLists;
        QStringList l1;
        l1<<"str1";
        QStringList l2;
        l2<<"str2";
        QStringList l3;
        l3<<"str3";
        QStringList l4;
        l4<<"str4";

        listOfLists<<l1<<l2<<l3<<l4;
        return  QVariant::fromValue(listOfLists);
    }

  Component.onCompleted: {
        var listsList = testObj.getlistOfLists()
        for(var i in listsList){
            console.log(listsList[i][0])
        }
    }