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The DDX_FieldScroll function synchronizes the scroll position of a scroll bar control in a record view and an int field data member of a recordset associated with the record view (or with whatever integer variable you choose to map it to).
void AFXAPI DDX_FieldScroll( CDataExchange* pDX, int nIDC, int& value, CRecordset* pRecordset ); void AFXAPI DDX_FieldScroll( 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 moving data from the recordset to the control, this function sets the scroll position of the scroll bar control to the value specified in value. On a transfer from the recordset to the control, if the recordset field is Null, the scroll bar control is set to 0. On a transfer from control to recordset, if the control is empty, the value of the recordset field is 0.
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_FieldScroll would be similar.