DDX_FieldScroll

void AFXAPI DDX_FieldScroll( CDataExchange* pDX, int nIDC, int& value, CRecordset* pRecordset );

void AFXAPI DDX_FieldScroll( CDataExchange* pDX, int nIDC, int& value, CDaoRecordset* pRecordset );

Parameters

pDX

A pointer to a CDataExchange object. The framework supplies this object to establish the context of the data exchange, including its direction.

nIDC

The ID of the first in a group (with style WS_GROUP) of adjacent radio button controls in the CRecordView or CDaoRecordView object.

value

A reference to a field data member in the associated CRecordset or CDaoRecordset object.

pRecordset

A pointer to the CRecordset or CDaoRecordset object with which data is exchanged.

Remarks

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). 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.

For more information about DDX, see Adding a Dialog Box in Visual C++ Tutorials and Dialog Data Exchange and Validation in Visual C++ Programmer’s Guide. For examples and more information about DDX for CRecordView and CDaoRecordView fields, see the article Record Views in Visual C++ Programmer’s Guide.

Example

See DDX_FieldText for a general DDX_Field example. Calls to DDX_FieldScroll would be similar.