DECLARE_DYNAMIC(CListeningSocket);哪位兄弟知道此句中“DECLARE_DYNAMIC”的作用和用法？
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解决时间 2021-11-13 21:51
- 提问者网友：太高姿态
- 2021-11-13 01:17
DECLARE_DYNAMIC(CListeningSocket);哪位兄弟知道此句中“DECLARE_DYNAMIC”的作用和用法？
最佳答案
- 五星知识达人网友：迟山
- 2021-11-13 01:39
DECLARE_DYNAMIC()相当于以下两句
CRuntimeClass * crt;
CRuntimeClass * GetCRuntimeClass();
//类似于这样的，具体是什么记不清了
IMPLEMENT_DYNAMIC()是对这两个声明的定义;
VC 如果要支持运行时类型识别，必须使用这两个宏，
因为 MFC 不自动支持 RTTI (运行时类型识别) 机制....
CRuntimeClass * crt;
CRuntimeClass * GetCRuntimeClass();
//类似于这样的，具体是什么记不清了
IMPLEMENT_DYNAMIC()是对这两个声明的定义;
VC 如果要支持运行时类型识别，必须使用这两个宏，
因为 MFC 不自动支持 RTTI (运行时类型识别) 机制....
全部回答
- 1楼网友：一秋
- 2021-11-13 02:51
DECLARE_DYNAMIC( class_name )
Parameters
class_name
The actual name of the class (not enclosed in quotation marks).
Remarks
When deriving a class from CObject, this macro adds the ability to access run-time information about an object’s class.
Add the DECLARE_DYNAMIC macro to the header (.H) module for the class, then include that module in all .CPP modules that need access to objects of this class.
If you use the DECLARE_DYNAMIC and IMPLEMENT_DYNAMIC macros as described, you can then use the RUNTIME_CLASS macro and the CObject::IsKindOf function to determine the class of your objects at run time.
If DECLARE_DYNAMIC is included in the class declaration, then IMPLEMENT_DYNAMIC must be included in the class implementation.
MSDN的解释。
Parameters
class_name
The actual name of the class (not enclosed in quotation marks).
Remarks
When deriving a class from CObject, this macro adds the ability to access run-time information about an object’s class.
Add the DECLARE_DYNAMIC macro to the header (.H) module for the class, then include that module in all .CPP modules that need access to objects of this class.
If you use the DECLARE_DYNAMIC and IMPLEMENT_DYNAMIC macros as described, you can then use the RUNTIME_CLASS macro and the CObject::IsKindOf function to determine the class of your objects at run time.
If DECLARE_DYNAMIC is included in the class declaration, then IMPLEMENT_DYNAMIC must be included in the class implementation.
MSDN的解释。
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