The DDX_FieldLBString copies the current selection of a list box control in a record view to a CString field data member of a recordset associated with the record view.
void AFXAPI DDX_FieldLBString( CDataExchange* pDX, int nIDC, CString& value, CRecordset* pRecordset ); void AFXAPI DDX_FieldLBString( CDataExchange* pDX, int nIDC, CString& 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.
- The ID of a control in the CRecordView or CDaoRecordView object.
- A reference to a field data member in the associated CRecordset or CDaoRecordset object.
- A pointer to the CRecordset or CDaoRecordset object with which data is exchanged.
In the reverse direction, this function sets the current selection in the list box to the first row that begins with the characters in the string specified by value. On a transfer from the recordset to the control, if the recordset field is Null, any selection is removed from the list box. On a transfer from control to recordset, if the control is empty, the recordset field is set to Null.
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_FieldLBString would be similar.