Answer / zerozero

DDX-Transfer the data b/w dialog control and data member.

ex: DDX_TEXT(pDX,IDC_NAME,m_strName)

DDV: Validated the data entered into dialog control varibles.
Ex: DDX_TEXT(pDX,IDC_NAME,m_strName)
DDV_TEXT(pDX,m_strName,30)

Answer / arundeva

DDX(DoDataExchange()
Is use To associate Control variable To Control ID.

DDV(DoDataValidation)
Is used to Set the range of control Value.

Answer / dharani

1)dialog data exchange (DDX)

All dialog data functions are done with C++ code. There are
no special resources or magic macros. The heart of the
mechanism is a virtual function that is overridden in every
dialog class that does dialog data exchange and validation.
It is always found in this form:

Copy Code
void CMyDialog::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX); // call base class

//{{AFX_DATA_MAP(CMyDialog)
<data_exchange_function_call>
<data_validation_function_call>
//}}AFX_DATA_MAP
}


2)dialog data validation (DDV)

Answer / prabhu.somasundaram

DDV - > Associate Single control with single variable.So
that we can define the properties for that associated variable.
DDX - > Associate Input Validation Function with Particular
variable.
for ex:
void DDV_Check(CDataExchange* dx, int DividerValue)

{
if ( DividerValue< 0)
{
AfxMessageBox("Not Valid Input for Divider");
dx->Fail();
}
}
///Calling Function

//{{AFX_DATA_MAP(CDlg)

DDV_Check(dx, m_age); // Our function

//}}AFX_DATA_MAP

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