Qt 使用QMetaObject实现反射机制代码demo

#include "QtFanshe.h" #include "Animal.h" QtFanshe::QtFanshe(QWidget* parent) : QMainWindow(parent) { ui.setupUi(this); connect(ui.pushButton, SIGNAL(clicked()), this, SLOT(slotfansheBtnClicked())); } void QtFanshe::slotfansheBtnClicked() { QObject* obj = CreateClassObject("Person"); Animal* an = qobject_cast<Animal*>(obj); an->setName("Hello"); QString name = an->name(); // QObject* obj2 = CreateClassObject("Person"); Animal* an2 = qobject_cast<Animal*>(obj2); an2->setName("nnn"); QString name2 = an2->name(); QString name3 = an->name(); } void QtFanshe::slotSignalTest() { } QObject* QtFanshe::CreateClassObject(const QString& className) { QString classNamePoint = className + "*"; int type = QMetaType::type(classNamePoint.toStdString().c_str()); if (type == 0) { return nullptr; } const QMetaObject* metaObj = QMetaType::metaObjectForType(type); QObject* obj = metaObj->newInstance(); //是产生新实例，并非单例。QT的插件dll产生的是单例：QPluginLoader pluginLoader(pluginPath + toolName + ".dll");QObject* tool = pluginLoader.instance(); return obj; }