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Regarding Serialization ...

Posted on 1998-12-13
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Last Modified: 2013-11-20
hello everybody
I am going through MFC tutorials (Scribble). There is one object declared
as follows :

CTypePtrList<CObList, CStroke *> m_strokeList;

The serialise function in CScribbleDoc is declared as follows :

      if (ar.IsStoring())
      {
            // TODO: add storing code here
      }
      else
      {
            // TODO: add loading code here
      }

      m_strokeList.Serialize( ar );

And the serialise function for "CStroke" has been defined and implemented.
What i am unable to understand is that how does the serialise function
of "CStroke" is being called when i save the document.
What i understand is that m_strokeList.Serialise() calls the serialise
function of the base class "CObject". Now how does the base class knows
that the object being serialised is list of pointes which are to be
serialised one by one so that serialise function of CStroke is called
for all pointers in the m_strokeList.
 
The "DECLARE_SERIAL" and "IMPLEMENT_SERIAL" macros are present in CStroke.

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Question by:aarya
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2 Comments
 
LVL 15

Accepted Solution

by:
Tommy Hui earned 10 total points
ID: 1326123
The CList is derived from CObject. Basically, every CObject-derived class has the ability to serialize itself. So in this case, when the CList container is asked to serialize itself, it knows to store information about itself into the document. It also knows that there are objects in the link and saves them into a stream.

There's a book called MFC Internals by Sheppard and Wingo. Take a look at it if you want to know more about the internals of MFC.
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Author Comment

by:aarya
ID: 1326124
Well, what i dont understand is that CObject derived class in this case CObList does not override the functionality of serialize function so how can CObject have knowledge to take care of the fact that each member of the CObList is to be serialized.

If CObList had been overriding the serialize function then i can understand how they would have implemented but otherwise how can u take care.

Any nice to have response from u.
 Thui it seems that u r point rich man. I have plenty of questions to ask but no points left. Can u do me a favor to lend few points.
 Thanks in advance.
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