The DDX_FieldRadio function associates a zero-based int member variable of a record view's recordset with the currently selected radio button in a group of radio buttons in the record view.
void AFXAPI DDX_FieldRadio( CDataExchange* pDX, int nIDC, int& value, CRecordset* pRecordset ); void AFXAPI DDX_FieldRadio( CDataExchange* pDX, int nIDC, int& value, CDaoRecordset* pRecordset );
A pointer to a CDataExchange object. The framework supplies this object to establish the context of the data exchange, including its direction.
A reference to a field data member in the associated CRecordset or CDaoRecordset object.
When transferring from the recordset field to the view, this function turns on the nth radio button (zero-based) and turns off the other buttons. In the reverse direction, this function sets the recordset field to the ordinal number of the radio button that is currently on (checked). On a transfer from the recordset to the control, if the recordset field is Null, no button is selected. On a transfer from control to recordset, if no control is selected, the recordset field is set to Null if the field permits that.
Use the first version if you are working with the ODBC-based classes. Use the second version if you are working with the DAO-based classes.
See DDX_FieldText for a general DDX_Field example. Calls to DDX_FieldRadio would be similar.