QT插件系统

1. 创建接口头文件,Q_DECLARE_INTERFACE,定义接口

   #ifndef PLUGINONEINTERFACE_H
   #define PLUGINONEINTERFACE_H
   #include <QWidget>
   // 组织域名+产品名+版本号
   #define PluginOneInterfaceIID "baidu.com.PluginOneInterface/1.0"
   class PluginOneInterface
   {
   public:
   virtual ~PluginOneInterface() = default;
   virtual QWidget* getWidget() = 0;
   };
   Q_DECLARE_INTERFACE(PluginOneInterface,PluginOneInterfaceIID)
   #endif // PLUGINONEINTERFACE_H

2. 编写插件类,继承接口类

   class PLUGINONE_EXPORT PluginOne:public QObject ,public PluginOneInterface
   {
   Q_OBJECT
   Q_PLUGIN_METADATA(IID PluginOneInterfaceIID FILE "PluginOne.json")
   Q_INTERFACES(PluginOneInterface)
   public:
   PluginOne();
   ~PluginOne();
   QWidget * getWidget() override;
   private:
   QWidget * mWidget{nullptr};
   };

3. 主项目加载插件

4. 获取插件中元数据Q_PLUGIN_METADATA的json数据

   QJsonObject meta = loader.metaData();
   QJsonObject metaData = meta.value("MetaData").toObject();
   QString version = metaData.value("version").toString();
   QString name = metaData.value("name").toString();