如何在QML文件中调用QObject的指针？ [英] How can I call a pointer of an QObject in a QML File?

问题描述

我正在为Blackberry 10开发一个应用程序，并且正在使用Momentics IDE（BB本机SDK）。

I'm developping an application for Blackberry 10 and I'm using the Momentics IDE (BB native SDK).

当我尝试执行下面的代码。任何人都有一个想法如何解决这个问题？

I get the following error when I try to execute the code below. Any one have an idea how can I fix this ?

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 p>

** xxx.cpp **

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

** QML档案 **

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

推荐答案

需要注册你的指针类型，像这样

You need to register your pointer type like this

qRegisterMetaType<ClassA*>("ClassA*");

（ source ）

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