DECLARE_DYNAMIC IMPLEMENT_DYNAMIC

https://baike.baidu.com/item/CRuntimeClass/1439795?fr=aladdin

https://blog.csdn.net/tgdzsjh/article/details/30255733

https://www.cnblogs.com/weiqubo/archive/2010/12/24/1915833.html

继承自CObject的类：

类CDialogEx也继承自CObject；

.h中：

class CPara_EV : public CDialogEx
{
DECLARE_DYNAMIC(CPara_EV)

...

}

.cpp中：

IMPLEMENT_DYNAMIC(CPara_EV, CDialogEx)