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 );
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.