[jawsscripts] GetCursorPosString question

I am trying to get the cursor position using the GetCursorPosString
function. One of the parms is a string to tell it which measurement to
use. This doesn't appear to change the return result. I am using the
script below. 
I have tried several things to substitute for smmSpaces. Can anybody
tell me what I am doing wrong?

Is it possible that the window I am reading has no other methods of
measurement available?

Script SayPosition ()
var  
        string sPos
let sPos = GetCursorPosString (GetActiveCursor (),smmSpaces)
Say (sPos,ot_Message)
EndScript

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