如何在QML文件中调用QObject的指针？

我正在为Blackberry 10开发应用程序,而我正在使用Momentics IDE(BB原生SDK).

当我尝试执行下面的代码时出现以下错误.任何人都知道如何解决这个问题？

错误

QMetaProperty::read: Unable to handle unregistered datatype 'DataHandler*' for property 'xxx::dataHandler'
asset:///main.qml:104: TypeError: Result of expression 'xxx.dataHandler' [undefined] is not an object.
Process 627863799 (xxx) terminated SIGSEGV code=1 fltno=11 ip=08055b30(/accounts/1000/appdata/com.ddd.xxx.testDev_e_xxx45b0f435/app/native/xxx@main+0x5d63) ref=006e0075

**xxx.hpp**

class xxx: public QObject {
Q_OBJECT

Q_PROPERTY(DataHandler* dataHandler READ getDataHandler)

public:
    xxx(bb::cascades::Application *app);
    virtual ~xxx() {
    }

    Q_INVOKABLE
    DataHandler* getDataHandler() const;

private:
    DataHandler* m_dataHandler;
}

**xxx.cpp**

xxx::xxx(bb::cascades::Application *app) :
        QObject(app) {
m_dataHandler = new DataHandler();
}

**QML文件**

Button {
         id: backBtn
         objectName: "backBtnObject"
         text: qsTr("Back") + Retranslate.onLocaleOrLanguageChanged
         preferredWidth: backBtn.text.length
         visible: false
         onClicked: {
              xxx.dataHandler.displayLicencesList();
         }
 }

Aralox.. 5

您需要像这样注册指针类型

qRegisterMetaType("ClassA*");

(来源)