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Serialization

Posted on 2001-09-02
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Last Modified: 2013-11-20
Hi,
I use CMemFile and CArchive
First store in ar and save buffer from file in Registry key
What I store is CObArray
The object is:
class Sites
{
private:
CString first,second;
public:
CString GetFirst();
CString GetSecong();
...
}
Here is my OnCreate() where I whant to read stored data and init CListBox

const INT nSIZE = 4096;
HKEY hKey;
DWORD dwType;
DWORD dwData  = nSIZE;
BYTE* bData   = (BYTE*)::calloc(nSIZE, sizeof(TCHAR));
ASSERT(bData);

     if(ERROR_SUCCESS !=
   
     ::RegOpenKeyEx(HKEY_CURRENT_USER,"Software\\Pltodorov\\ReplCheck\\",0,KEY_ALL_ACCESS,&hKey))
   
    MessageBox("Error Open");



const LONG retValue = ::RegQueryValueEx(hKey, "proba", NULL, &dwType,bData, &dwData);
     
     
if(retValue == ERROR_SUCCESS && REG_BINARY == dwType)
     {

  // Load Read values in file
  CMemFile file(bData, nSIZE);
 
  //Attach file to archive
  CArchive ar(&file, CArchive::load);

  //Load "object"
  object.Serialize(ar);

  ar.Close();
  file.Close();

     }

// Loop and load elements to List box
     if(object.GetSize())
     {
     
     for(int i=0;i < object.GetSize();i++)
          {
     
          Sites*     pSite=(Sites*)object[i];
               
          CRuntimeClass*     pRt=pSite->GetRuntimeClass();
         
          pRt->m_nObjectSize;


          if(pSite->IsKindOf(RUNTIME_CLASS(Sites))) MessageBox("It Is");
         
          CListBox* pList=(CListBox*)dlgbar.GetDlgItem(IDC_LIST);
         
          pList->AddString(pSite->GetFirst());
          }
My problem is that pRt->m_nObjectSize;
in not 0 but string stay empty
0
Comment
Question by:plamtod
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6 Comments
 
LVL 9

Expert Comment

by:ShaunWilde
ID: 6448961
what is the full definition of Sites look like?

CObList::Serialize requires that you provide friend operators for << and >> for non CObject classes (eg CString)


friend CArchive& AFXAPI operator<<(CArchive& ar, const Sites& sites)
{
  ar << sites.first;
  ar << sites.second;
}

friend CArchive& AFXAPI operator>>(CArchive& ar, Sites& sites)
{
  ar >> sites.first;
  ar >> sites.second;
}



0
 

Author Comment

by:plamtod
ID: 6448977
class Sites : public CObject  
{
public:
     void SetSecond(CString nSecond);
     CString GetSecond();
     CString first;
     void SetFirst(CString nFirst);
     CString GetFirst();
     Sites();
     virtual ~Sites();

private:
     CString second;
//     CString first;

     DECLARE_SERIAL(Sites)//!!!!!!!
};

It's possible
CObArray object;
object.Serializa(ar);
0
 
LVL 9

Expert Comment

by:ShaunWilde
ID: 6449165
yes but whan you do DECLARE_SERIAL you will see that MFC defines that you require the above >> friend operator (afx.h) - the above operators I mentioned above - should work (Maybe with a few mods) but the essence is there

> It's possible

it is working now ? or it compiles ?
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Author Comment

by:plamtod
ID: 6449878
I use the idea from
http://camis.kaist.ac.kr/~mkshin/msvc_source/misc/stringlist_to_reg.shtml

Should I predefine <<(>>).
0
 
LVL 9

Accepted Solution

by:
ShaunWilde earned 150 total points
ID: 6449967
I see - but if you look in mfc/src/list_s.cpp you will see that CStringList::Serialize(CArchive& ar) understands that it is dealing with CStrings and will therefore serialize them correctly - what I am saying is that MFC does not undestand how to serialize Sites and will need help (from you)
0
 

Author Comment

by:plamtod
ID: 6450037
Thanks a lot.
I wasn't overload Serialize for Sites class
Now O.K.
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