class Serialization problem

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i need to serailize my class.
my class looks like below

//.h
class Test
{
	int m_nData;
	CString m_csData;
public:
	void SetData( int nData_i, CString csData_i );
	void GetData( int& nData_o, CString& csData_o );
};

//.cpp
void Test::SetData( int nData_i, CString csData_i )
{
	m_nData = nData_i;
	m_csData = csData_i;
}
void Test::GetData( int& nData_o, CString& csData_o )
{
	nData_o = m_nData;
	csData_o = m_csData;
}

now to support serailization i changed the code as shown below

//.h
class Test : public CObject
{
	DECLARE_SERIAL (Test)
	int m_nData;
	CString m_csData;
public:
	Test()
	{
	}
	void SetData( int nData_i, CString csData_i );
	void GetData( int& nData_o, CString& csData_o );
	void Serialize (CArchive& ar);
};

//.cpp
IMPLEMENT_SERIAL (Test, CObject, 1)
void Test::SetData( int nData_i, CString csData_i )
{
	m_nData = nData_i;
	m_csData = csData_i;
}
void Test::GetData( int& nData_o, CString& csData_o )
{
	nData_o = m_nData;
	csData_o = m_csData;
}
void Test::Serialize (CArchive& ar)
{
    CObject::Serialize (ar);
    if (ar.IsStoring ())
        ar << m_nData << m_csData;
    else // Loading, not storing
        ar >> m_nData >> m_csData;
}

and in below function i am storing the Test class object to a file

void CSerailizationDlg::OnStoreButton() 
{	
	Test TestObj;
	TestObj.SetData( 1, "Testing" );
	CFile file;
	file.Open( "test", CFile::modeReadWrite );
	CArchive arch( &file, CArchive::store );
	arch << TestObj;
	:
	:
}

Is there anything wrong with this or missing anything?
i get the error "binary '<<' : no operator defined which takes a left-hand operand of type 'class CArchive'"
I think there is no need to overload << operator in my Test class since macros do it.
What is going wrong here?
can anyone help..plsss

Posted 2-Jun-11 20:04pm

Resmi Anna

Updated 8-Jun-11 19:39pm

v2

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2 solutions

Solution 1

I think the problem is that CArchive does not define a binary '<<' operator that takes objects of type 'Test', unless 'Test' derives from 'CObject'. That's why arch << TestObj call does not compile. If you replace it with TestObj.Serialize(arch) or inherit 'Test' from 'CObject', it will compile (I think you might need to pass a pointer to CObject - derived classes, so the call would look like arch << &TestObj).

Posted 9-Jun-11 0:58am

dasblinkenlight

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Febil Chacko Thanikal · Accepted Answer · 2011-06-09T22:17:00

CArchive provides << and >> operators for writing and reading simple data types as well as CObjects to and from a file.

The function prototypes of CArchive is shown below:
friend CArchive& AFXAPI operator<<(CArchive& ar, const CObject* pOb);

The sample code to serialize and deserialize are shown below

// Serialize
Test TestObj;
TestObj.SetData( 23, "Testing" );
CFile file;
file.Open( "C:\\test", CFile::modeReadWrite );
CArchive arch( &file, CArchive::store );
arch<<&TestObj;

// Deserialize
Test* pTestObj1;
CFile file1;
file1.Open( "C:\\test", CFile::modeReadWrite );
CArchive arch1( &file1, CArchive::load );
arch1>>pTestObj1;