QQmlList属性：无法分配给不存在的属性"lon" lon："3"

Question

我想看看如何使用QQmlListProperty。我尝试了以下方法，但我不确定这是否是正确的方法。标题中显示错误。

啊

#ifndef IMO
#define IMO
#include <QQmlListProperty>
#include "DummyClass.h"
class SubClass: public QObject
{
  Q_OBJECT
  Q_PROPERTY (QQmlListProperty <DummyClass> functionWhat READ functionWhat)
public:
  SubClass (QObject *parent = 0);
  QQmlListProperty <DummyClass> functionWhat()
  {
    return QQmlListProperty <DummyClass> (this, dummyList);
  }
private:
  QList <DummyClass*> dummyList;   
};
#endif

AA.cpp

#include "aa.h"
#include <QtGui/QGuiApplication>
#include "qtquick2applicationviewer.h"
SubClass :: SubClass (QObject *parent) : QObject (parent)
{
  qDebug ("In Constructor.");
}
void appendDummies (QQmlListProperty<DummyClass> *property, DummyClass *dc)
{
  qDebug ("Do nothing. Can't add to a directory using this method.");
}

虚拟类.h

#ifndef IM
#define IM
#include <QObject>
class DummyClass : public QObject
{
  private:
    Q_OBJECT
    Q_PROPERTY (bool functionWhat READ functionWhat WRITE functionSetWhat)  
  public:
    DummyClass (QObject *parent = 0) {}
    float lat; float lon;
    bool functionWhat ()
    {
        qDebug ("In functionWhat");
    }
  public slots:
    void functionSetWhat (bool arg)
    {
        qDebug ("In functionWhatSlot");
    }
  signals:
    void functionWhatChanged (bool arg);
};
#endif

主.cpp

#include <QtGui/QGuiApplication>
#include "qtquick2applicationviewer.h"
#include "/home/anisha/qmllistproperties/DummyClass.h"
#include <QtQml>
#include "/home/anisha/qmllistproperties/aa.h"
int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    const char* ocuui = "OCUUI"; // @uri OCUUI
    qmlRegisterType <DummyClass> (ocuui, 1, 0, "DummyClass");
    qmlRegisterType <SubClass> (ocuui, 1, 0, "SubClass");

    QtQuick2ApplicationViewer viewer;
    viewer.setMainQmlFile(QStringLiteral("qml/untitled/main.qml"));
    viewer.showExpanded();
    return app.exec();
}

主.qml

import QtQuick 2.0
import OCUUI 1.0
Rectangle {
    width: 360
    height: 360
    Text {
        text: qsTr("Hello World")
        anchors.centerIn: parent
    }
    SubClass
    {
       functionWhat:
       [
           DummyClass
           {
              lat: "2"
              lon: "3"
           }
       ]
    }

    MouseArea {
        anchors.fill: parent
        onClicked: {
            Qt.quit();
        }
    }
}

Answer 1

您似乎缺少DummyClass中lat和lon属性的属性声明：

Q_PROPERTY (int lat READ getLat WRITE setLat)
Q_PROPERTY (int lon READ getLon WRITE setLon)

你应该研究这个例子。