Question

我可以从Qt插件访问大量元数据，但我无法以QMetaEnums的身份访问枚举。然而，我能够在我的类中获取返回该枚举的方法，并且能够将其转换为QMetaType并获取其id（1026）。我也需要QMetaEnum中包含的信息。我想我错过了什么。请看一下我的代码：

//Plugin interface
class PluginInterface
{
public:
    virtual void initialize() = 0;
};
#define PluginInterface_iid "pluginInterface"
Q_DECLARE_INTERFACE(PluginInterface, PluginInterface_iid)


//Actual plugin implementing PluginInterface
enum Fruit{ Apple, Pear, Mango };
Q_DECLARE_METATYPE(Fruit)
class MYQTCALCPLUGINSHARED_EXPORT MyQtCalcPlugin : public QObject, PluginInterface
{
    Q_CLASSINFO("version", "0.1")
    Q_OBJECT
    Q_PLUGIN_METADATA(IID PluginInterface_iid FILE "myqtcalcplug.json")
    Q_INTERFACES(PluginInterface)
    Q_ENUMS(Fruit)
public:
    explicit MyQtCalcPlugin(QObject *parent = 0);
void MyQtCalcPlugin::initialize()
{
    qRegisterMetaType<MyQtCalcPlugin*>("MyQtCalcPluginPtr");
    qRegisterMetaType<Fruit>("Fruit");
    qRegisterMetaType<Fruit*>("FruitPtr");
}   
public slots:
    Fruit TasteFruit()
    {
        return Fruit::Apple;
    }
};
#endif // MYQTCALCPLUGIN_H

//application that is reading the metadata
QPluginLoader pluginLoader(pluginPath);
if (pluginLoader.load());
QObject *pluginInstance = pluginLoader.instance();
auto pluginInterface = qobject_cast<PluginInterface*>(pluginInstance);
pluginInterface->initialize();   
const QMetaObject *pMetaObject = pluginInstance->metaObject();
int count = pMetaObject->enumeratorCount(); //count becomes 0

Answer 1

Enum已经从班级外部转移到班级内部。这解决了这个问题。 Q_DECLARE_META_TYPE（Fruit）和qRegisterMetaType是多余的：

c_views.reduceByKey(lambda x, y: x + y)

Qt插件：无法从Qt插件获取枚举的元数据

1 个答案: