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SetScrollInfo info  Overview  Group

The SetScrollInfo function sets the parameters of a scroll bar, including the minimum and maximum scrolling positions, the page size, and the position of the scroll box (thumb). The function also redraws the scroll bar, if requested.

int SetScrollInfo(

    HWND hwnd,

// handle of window with scroll bar

    int fnBar,

// scroll bar flag

    LPSCROLLINFO lpsi,

// pointer to structure with scroll parameters

    BOOL fRedraw

// redraw flag

   );

Parameters

hwnd
Identifies a scroll bar control or a window with a standard scroll bar, depending on the value of the fnBar parameter.
fnBar
Specifies the type of scroll bar for which to set parameters. This parameter can be one of the following values:

Value

Meaning

SB_CTL

Sets the parameters of a scroll bar control. The hwnd parameter must be the handle of the scroll bar control.

SB_HORZ

Sets the parameters of the given window's standard horizontal scroll bar.

SB_VERT

Sets the parameters of the given window's standard vertical scroll bar.

lpsi
Points to a SCROLLINFO structure. Before calling SetScrollInfo, set the cbSize member of the structure to sizeof(SCROLLINFO), set the fMask member to indicate the parameters to set, and specify the new parameter values in the appropriate members.

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’s 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.

fRedraw
Specifies whether the scroll bar is redrawn to reflect the changes to the scroll bar. If this parameter is TRUE, the scroll bar is redrawn, otherwise, it is not redrawn.

Return Values

The return value is the current position of the scroll box.

Remarks

The SetScrollInfo function performs range checking on the values specified by the nPage and nPos members of the SCROLLINFO structure. The nPage member must specify a value from 0 to nMax - nMin +1. The nPos member must specify a value between nMin and nMax - max(nPage  - 1, 0). If either value is beyond its range, the function sets it to a value that is just within the range.

See Also

GetScrollInfo, SCROLLINFO


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