OpenEuphoria

Re: bug in position()

• Posted by Al Getz <Xaxo at aol.com> Sep 27, 2005
• 438 views

Juergen Luethje wrote:
> 
> Robert Craig wrote:
> 
> > Robert Craig wrote:
> >
> >> jacques desch=EAnes wrote:
> >>
> >>> As windows consoles may have more than 25 lines, there is a bug with
> >>> the actual implementation of position().
> >>> If line is greater than 25 euphoria crash. (tested on windows xp pro)
> >>>
> >>> exemple:
> >>> }}}
<eucode>
> >>> include graphics.e
> >>> sequence pos
> >>> pos = get_position()
> >>> position(pos[1],pos[2]-1) -- crash if pos[1]>25
> >>> </eucode>
{{{

> >>
> >> Ok, thanks Jacques.
> >> I duplicated the problem on my machine.
> >> I'll fix it for the next release.
> >> A couple of other people have reported similar
> >> problems with consoles over 25 lines. It's not just 2.5,
> >> but earlier releases too.
> 
> Just for the sake of completeness:
> The problem does *not* exist on my Windows 98 machine.
> Someone else reported to me the same problem under Win 2000 SP4.
> I could duplicate it under Windows XP, using a console window with
> 25(!) lines, so not only consoles with over 25 lines are affected.
> 
> I used something like
> }}}
<eucode>
> pos = get_position()
> position(pos[1], 1)
> </eucode>
{{{

> 
> I don't have a Windows XP machine here right now, and unfortunately I
> forgot to write down the error message, but as far as I recall it was
> something like "Can't move cursor to line 27" or so.
> So it seems to be a bug in get_position() rather than position().
> pos[1] is provided by get_position(), which should always be an existing
> line, shouldn't it?
> 
> > As a quick fix, try calling text_rows()
> > in graphics.e. That seems to tell Euphoria about the larger number
> > of lines, and stop it from giving a false error report. e.g.
> >
> > }}}
<eucode>
> > include graphics.e
> > sequence pos
> >
> > if text_rows(43) then
> > end if
> > pos = get_position()
> > position(pos[1],pos[2]-1) -- crash if pos[1]>25
> > </eucode>
{{{

> 
> That worked for me, too. Thanks!
> 
> > The ed editor does that, and it handles
> > console windows with a large number of lines.
> 
> Regards,
>    Juergen
> 
> --
> Have you read a good program lately?
> 
> 

Hi there,


Another possibility might be to check first with video_config()...

s=video_config()
if s[VC_LINES]>=26 then
  position(26,1)
  puts(1,"26")
else
  scroll(1,1,25)
  position(25,1)
  puts(1,"25")
end if



Take care,
Al

And, good luck with your Euphoria programming!

My bumper sticker: "I brake for LED's"