An application sends the SBM_GETSCROLLINFO message to set the parameters of a scroll bar.
SBM_SETSCROLLINFO wParam = (WPARAM) fRedraw; // redraw flag lParam = (LPARAM) (LPSCROLLINFO) lpsi; // scroll bar parameters
The fMask member can be a combination of the following values:
Value
Meaning
SIF_DISABLENOSCROLL
Disables the scroll bar instead of removing it, if the scroll bar痴 new parameters make the scroll bar unnecessary.
SIF_PAGE
Sets the scroll page to the value specified in the nPage member of the SCROLLINFO structure pointed to by lpsi.
SIF_POS
Sets the scroll position to the value specified in the nPos member of the SCROLLINFO structure pointed to by lpsi.
SIF_RANGE
Sets the scroll range to the value specified in the nMin and nMax members of the SCROLLINFO structure pointed to by lpsi.
The return value is the current position of the scroll box.
The messages that indicate scroll-bar position, WM_HSCROLL and WM_VSCROLL, provide only 16 bits of position data. However, the SCROLLINFO structure used by SBM_GETSCROLLINFO, SBM_SETSCROLLINFO, GetScrollInfo, and SetScrollInfo provides 32 bits of scroll-bar position data. You can use these messages and functions while processing either the WM_HSCROLL or WM_VSCROLL messages to obtain 32-bit scroll-bar position data.
GetScrollInfo, SBM_GETSCROLLINFO, SCROLLINFO, SetScrollInfo
.