OpenEuphoria

Re: bug in position()

• Posted by "Juergen Luethje" <j.lue at gmx.de> Sep 27, 2005
• 471 views

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

pos = get_position()
position(pos[1], 1)

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

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