EQuestionAnswers.com Computer/Electronics Questions and Answers
C, C++, VC++, COM/DCOM, DLL and more
#Login #Sign up  Facebook Twitter TGoogle+
 

#Previous question #Index of VC++/WIN32/MFC Questions #Next question

Dynamic creation of Object

MFC/C++ uses new operator to create an object from a constant type at runtime. MFC supports dynamic creation of object using type with runtime type identification support. DYNCREATE macro pair is used for this purpose.

DECLARE_DYNCREATE

This macro enables objects of CObject-derived classes to be created dynamically at run time. Ths is used in the declaration part of the class and thus can be added in .h file.

Syntax

DECLARE_DYNCREATE(class_name)
/* class_name = The actual name of the class.*/

IMPLEMENT_DYNCREATE

Enables objects of CObject-derived classes to be created dynamically at run time when used with the DECLARE_DYNCREATE macro. Ths is used in the implementation part of the class and thus can be added in .h file.

Syntax

IMPLEMENT_DYNCREATE(class_name, base_class_name )
/* class_name = The actual name of the class.
   base_class_name = Base class name.
 */

DYNCREATE Example


class CMyDynCreateObj : public CObject
{
     int m_Num;
public:
     DECLARE_DYNCREATE(CMyDynCreateObj)
     CMyDynCreateObj(int Num) { m_Num = Num; }
private:
     CMyDynCreateObj() { m_Num = 0; } 
};

IMPLEMENT_DYNCREATE(CMyDynCreateObj, CObject)

void TestCreateObject(void)
{
  CRuntimeClass* prt = RUNTIME_CLASS(CAge);
  ASSERT(strcmp(prt->m_lpszClassName, "CAge") == 0);
}

You have viewed 1 page out of 109. Your VC++ learning is 0.00% complete. Login to check your learning progress.

 Vote 0

Similar topics related to this section

#Programming Windows, Fifth Edition (Developer Reference)
#Programming Applications for Microsoft Windows (Microsoft Programming Series)
#Programming Windows with MFC, Second Edition
#Visual C++ Programming
#Programming Microsoft Visual C++, Fifth Edition

* #1 webmaster Sun 27 Apr/2014 01:36:43(GMT)  Like 0 Unlike 0

Dear Users,

We are pleased to inform you that a forum/blog has been incorporated with www.mybestnotes.co.in. You are welcomed to add your comments, requests, codes, solutions and feedback to it. Please login(if already a member) or signup(for free) to avail to this facility.

Regards,
Webmaster

Your message goes here:

Name:Guest
Email:anonymous@unknown.com
My Post:*
Secutiry Code: ******  *
Preview this compose before posting this in discussion forum.
 
Note:
  1. Use [Sxx] code to show smiles. Example [S02]
  2. Use [URL ], example [URL http://www.google.com/]
  3. To display code or un formatted text use [CODE] [/CODE]. Example: [CODE] printf("Hello world"); [/CODE]
 [S01]   [S02]   [S03]   [S04]   [S05]   [S06]   [S07]   [S08] 
 [S09]   [S10]   [S11]   [S12]   [S13]   [S14]   [S15]   [S16] 
 [S17]   [S18]   [S19]   [S20]   [S21]   [S22]   [S23]   [S24] 

Note: Only members are allowed, * fields are mandatory.