void GetScrollRange( LPINT lpMinPos, LPINT lpMaxPos ) const;
lpMinPos
Points to the integer variable that is to receive the minimum position.
lpMaxPos
Points to the integer variable that is to receive the maximum position.
Copies the current minimum and maximum scroll-bar positions for the given scroll bar to the locations specified by lpMinPos and lpMaxPos.
The default range for a scroll-bar control is empty (both values are 0).
::GetScrollRange, CScrollBar::SetScrollRange