void AFXAPI DDX_Scroll( CDataExchange* pDX, int nIDC, int& value );
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 resource ID of the scroll-bar control associated with the control property.
value
A reference to a member variable of the dialog box, form view or control view object with which data is exchanged.
Remarks
The DDX_Scroll function manages the transfer of int data between a scroll-bar control in a dialog box, form view, or control view object and an int data member of the dialog box, form view, or control view object.
When DDX_Scroll is called, value is set to the current position of the control’s thumb.
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.