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GetScrollPos()
Return the scroll box position
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Syntax
GetScrollPos( <hWnd>, <nBar> )   -->   nPos

Arguments
<hWnd> is the handle to the window with the scroll bar, or the
handle to an actual scroll bar.

<nBar> is an integer which identifies the scroll bar.  (One of
the SB_* values defined in WINDOWS.CH.)

Returns
The position is returned as a numeric value.  If an error is
detected, zero (0) is returned.

Description
This function can be used to find the position of the scroll
box (also called a "thumb") within a scroll bar.  The <nBar>
parameter identifies the scroll bar as follows:

     <nBar>         means

     SB_CTL         Gets the position within the scroll bar <hWnd>

     SB_HORZ        Gets the position of the window's horizontal scroll bar

     SB_VERT        Gets the position of the window's vertical scroll bar

Example
nValue = GetScrollPos( hWnd, SB_HORZ )