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Icetips Article

Windows API: Extracting hight and low order values
2002-03-06 -- Larry Sand
 
Newsgroups: comp.lang.clarion,softvelocity.products.c55ee


Robert,

If you have this prototype:

ScWndProc   PROCEDURE(UNSIGNED hWnd,   |
                      UNSIGNED uMsg,   |
                      UNSIGNED wParam, |
                      LONG lParam)!,LONG,PASCAL

As Edward notes, the word order of an Intel 32 bit integer is reversed,
so define this structure over the wParam to get the low order word
containing the scroll bar value.

wP  GROUP,OVER(wParam)
low     USHORT
high    USHORT
    END

Then you can do some thing like:

CASE wP.low
OF SB_LEFT
  !handle the upper left scroll
....
END

Cheers,
Larry Sand


"Robert Rodgers"  wrote in message
news:3c86c6cc$1@news.softvelocity.com...
| Hi All,
|
| I need to capture the horizontal scrolling events for a clarion list
box. I
| am using a call back.  I am getting the WM_HSCROLL alright but I am
not able
| to determine what the event is.  Apparently the request  is in the
low-order
| word of the wparam.  I haven't stumbled onto the magic to make this
work
| yet.
|

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