Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Newbie problem with SerializeElements

Posted on 2002-05-20
3
Medium Priority
?
507 Views
Last Modified: 2013-11-20
Hi

I'm getting the following error while implementing SerializeElements:

"'CArchive::CArchive': cannot access protected member declared in class 'CArchive'"

This is the code I am using:

template <> 
void AFXAPI SerializeElements <CStockData>
( CArchive& ar, CStockData* pNewSD, int nCount )
{    
     for ( int i = 0; i < nCount; i++, pNewSD++ )
          pNewSD->Serialize( ar );
}

and it is defined in the header as:

template <> 
void AFXAPI SerializeElements <CStockData>
( CArchive& ar, CStockData* pNewSD, int nCount );

outside of the class declarations.

The SerializeElements code is sitting in a class (CStockDataList: public CList< CStockData, CStockData & > ) that adds CStockData objects (derived from CObject) to a list.  The StockData.h has been included in StockDataList.h as well as afxtempl.h for CList.


CStockData has been serialised by using
IMPLEMENT_SERIAL(CStockData, CObject, 1) in the .cpp and
DECLARE_SERIAL(CStockData) in the .h

I use the following code for CStockData Serialize  (All data members are protected):

void CStockData::Serialize(CArchive ar)
{
     if (ar.IsStoring ())
          ar << m_date << m_dblPrice << m_strFund;
     else
          ar >> m_date >> m_dblPrice >> m_strFund;
}



I'm still pretty new to MFC so I'm not really sure what the error message is trying to tell me, or if I'm even looking in the right place for the solution.  I've looked in the MSDN and the code I'm using for SerializeElements seems to be correct, so I'm stumped as to what I'm missing.

Any help would be greatly appreciated.

Thanks in advance.
0
Comment
Question by:boomshanker
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 1

Accepted Solution

by:
kender_a earned 400 total points
ID: 7156510
Hi!

It looks like your function is geared for MFC CObjects & CArchives.

You don't need to write a template function for that (unless you have some special non-MFC reasons for making a template functions). Since method Serialize(...) is defined as virtual in the CObject, it's more conventional to declare your function like this:

 void AFXAPI SerializeElements
 ( CArchive& ar, CObject* pNewSD, int nCount );

Implementation remains the same as yours.

You are getting the error regarding protected CArchive::CArchive because somewhere in your code you have constructed a CArchive without constructor arguments i.e.:

 CArchive ar;

The problem is caused by CStockData::Serialize(CArchive ar)
- it receives CArchive by value, but it shoud receive it by reference.
Should be CStockData::Serialize(CArchive& ar).

Sincerely,
Kender

 
0
 
LVL 1

Author Comment

by:boomshanker
ID: 7160490
Thanks!!!

I had actually given up on this project (and almost on MFC!!!).

You were right on the money.  I was using CArchive ar instead of &ar.  As soon as I changed that, it worked.

Thanks again.
0
 
LVL 1

Expert Comment

by:kender_a
ID: 7161479
You're wellcome at any time!

Kender
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Here is how to use MFC's automatic Radio Button handling in your dialog boxes and forms.  Beginner programmers usually start with a OnClick handler for each radio button and that's just not the right way to go.  MFC has a very cool system for handli…
Introduction: Load and Save to file, Document-View interaction inside the SDI. Continuing from the second article about sudoku.   Open the project in visual studio. From the class view select CSudokuDoc and double click to open the header …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
Suggested Courses

722 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question