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Posted 28 Jun 2002

Serialization in non - Document/View arch. projects .

, 28 Jun 2002
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This explains how to serialize objects in non document/view architecture projects


This article will show you how you can serialize data to disk and retrieve it again in non doc/view architecture projects. Just follow the steps outlined.

Steps to follow

  • Create a normal project as you usually do.
  • Add the class which you would use to serialize the data. It might contain just normal variables or collection classes or any kind of data that you want to store.
    • Be sure to derive that class from CObject. Only then you can serialize the data.
    • Be sure to use the DECLARE_SERIAL macro inside.
  • //CInfo.h
    class CInfo : public CObject
        virtual void Serialize(CArchive& ar);
        int m_nIndex;
        CString m_strName;
  • Add the serialization function in this class's .cpp file. Be sure to use the IMPLEMENT_SERIAL macro as shown.
  • //CInfo.cpp
    #include "stdafx.h"
    #include "CInfo.h"
    void CInfo::Serialize(CArchive& ar)
        if (ar.IsLoading()) // If you are loading data from the disk
            ar >> m_strName;
            ar >> m_nIndex;
        else // If you are storing data to the disk
            ar << m_strName;
            ar << m_nIndex;
  • As this example is concerned with just 2 variables, assume that 2 edit controls have been created to accommodate the Index and the Name. Add 2 variables to those edit controls using the Class Wizard. Now the File to which the data has to be written or read from has to be defined. I do that simply by :-
  • // The Accounts.dat file is the 
    // file that we are going to use 
    // to save and read data
    #define DATA_FILE _T("Accounts.dat") 
  • Now, we write the code for storing the data to the disk. Here, m_bCanSave is declared in the header file as BOOL m_bCanSave; and in the constructor it has been initialized as m_bCanSave = FALSE;
  • void SaveRecords()                  
    //  Code to serialize and save the data
        UINT nFlags = CFile::typeBinary | CFile::modeWrite;
        if (_access(DATA_FILE, 0))
            nFlags |= CFile::modeCreate;            
            // The file doesn't exist, so create it
            m_bCanSave = TRUE;
            int nTemp = _access(DATA_FILE, 6);  
            // Check Read Write Permissions
                m_bCanSave = TRUE;
        if (m_bCanSave)
            CFile file;
            CFileException fe;
            // The file exists with read & write permissions
            if (file.Open(DATA_FILE, nFlags, &fe))
                CArchive ar(&file, CArchive::store);
                Info.m_nIndex = m_nIndex;
                Info.m_strName = m_strName;
                Info.Serialize(ar); // Serialize the data
  • Now , we write the code for reading the data from the disk.
  • void LoadRecords()
        if (_access(DATA_FILE, 6)==0) // If File Exists
            CFile file;
            CFileException fe;
            if (file.Open(DATA_FILE,CFile::typeBinary | 
                CFile::modeRead, &fe))
                CArchive ar(&file, CArchive::load);
        m_nIndex = Info.m_nIndex;
        m_strName = Info.m_strName;


That's it. A Simple tutorial for serialization is complete. You have a program that can serialize data to the disk and retrieve it later. You didn't know that serialization was so easy. Did you? All Luck and have a nice time.


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Comments and Discussions

GeneralNice! Pin
Ravi Bhavnani3-Jun-03 3:51
memberRavi Bhavnani3-Jun-03 3:51 
GeneralHelp Serializing files over HTTP?? Pin
xxhimanshu30-Oct-03 20:48
memberxxhimanshu30-Oct-03 20:48 
GeneralRe: Help Serializing files over HTTP?? Pin
Ravi Bhavnani31-Oct-03 3:53
memberRavi Bhavnani31-Oct-03 3:53 
GeneralRe: Help Serializing files over HTTP?? Pin
xxhimanshu31-Oct-03 21:28
memberxxhimanshu31-Oct-03 21:28 
Thanks for your reply. I am already using HTTP to get the files from the server but i need those files to be updated on a daily basis and downloading daily the file makes the process very slow because the size of file becomes in MB's. So i want a way to serialize data from the server file to the local file and reflect just the changes in it and dont download the complete file..Please need this to be done..Any help or pointers are highly appreciated..Also there are no good tutorials of file serialing and then too through HTTp..i cud not find any good tutorials where i can understand to the serialization can be used in this case..i am using XML files and MFC..xml file serialization is possible in .NET but not in MFC..please show me a way..
Thanks a lot in advance..Confused | :confused: Confused | :confused:

GeneralRe: Help Serializing files over HTTP?? Pin
Ravi Bhavnani1-Nov-03 6:16
memberRavi Bhavnani1-Nov-03 6:16 

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