C / C++ / MFC

//Socket created and connected with server application
pSocket->creat();
pSocket->Connect(IPaddr,Port);

m_File = new CSocketFile(pSocket);
m_pArchIn = new CArchive(m_File,CArchive::load);
m_pArchOut = new CArchive(m_File,CArchive::store);

void SendDataToServer( )
{
  CTransData oData;       // deriver from CObject class
  oData.m_sListOut.AddTail(sPackData);
  pSocket->SendData(&oData);
}

void SendData(CTransData *pData)
{
  if (m_pArchOut != NULL)
  {
	TRY
	{
	   pData->Serialize(*m_pArchOut);
	   m_pArchOut->Flush();
	}
	CATCH(CFileException, e)
	{
	  m_pArchOut->Abort();
	  delete m_pArchOut;
	  m_pArchOut = NULL;
	}
	END_CATCH
  }

}

CTransData.cpp

void CTransData::Serialize(CArchive& ar)
{
   if (ar.IsStoring())
   {
       ar.WriteObject(&m_sListOut);     // In This Line I get Error
   }
   else
  {
      m_sListIn = (CStringList*)ar.ReadObject(RUNTIME_CLASS(CStringList));
  }

}

IDispatch * pDisp = GetHtmlDocument();