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RE: ATTN: Perl maintainer - RE: Problem with Perl/Tk and Pixmap


Reini Urban wrote on 2010-12-22: 
> 2010/12/22 Thrall, Bryan:
>> Thrall, Bryan wrote on 2010-12-16:
>>> Andrew DeFaria wrote on 2010-12-16:
>>>> ? On 12/16/2010 02:07 PM, Johannes v. Löwis wrote:
>>>>> I have a Perl/Tk script that is supposed to show a pixmap on the
>>>>> left side of the title bar of the main window. It works on Linux and
>>>>> on a rather old version of Cygwin 1.5. On Cygwin 1.7 (on XP Home and
>>>>> Prof) the following happens:
>>>>> 
>>>>> $ ./logotest.pl Can't bless non-reference value at
>>>>> /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Image.pm line 23. ...
>>>>> Any ideas or suggestions what further information I could provide in
>>>>> order to sort this out?
>>>>> 
>>>> Reproduced. Note you problem appears to be with Tk::Image, not with
>>>> Cygwin, though you are right in that it works on Linux and complains
>>>> and dies on Cygwin.
>>>> 
>>>> Interestingly, if you run your program and the Perl debugger (i.e.
>>>> perl -d logtest.pl) then simply type c for continue it works fine.
>>>> 
>>>> Looking at Image.pm I see that if I break at Image.pm:23 there's a
>>>> "return bless $obj,$package" statement. In the debugger, $obj is
>>>> defined and there's no problem. If, however, I just run this without
>>>> the debugger, but put some print statements in Image.pm, I see that
>>>> $obj is indeed returned from $widget->Tk::image as undefined.
>>>> 
>>>> This appears to be a Perl/Tk bug.
>>>> 
>>>> Even stranger! Change your
>>>> 
>>>> ? ?$mw->Pixmap('logo', -data=>$icon);
>>>> to
>>>> 
>>>> ? ?my $foo $mw->Pixmap('logo', -data=>$icon);
>>>> and it works! So you have ?a work around, and a bug to report.
>>> 
>>> I also can reproduce the problem.
>>> 
>>> This behavior reminds me of a perl-Tk packaging bug from last year:
>>> 
>>> http://www.cygwin.com/ml/cygwin/2009-07/msg00890.html
>>> 
>>> In fact, /usr/bin/widget seems to be broken again, unless you run it
>>> in the perl debugger:
>>> 
>>> thrall@pc1163-8413-xp ~
>>> $ /usr/bin/widget
>>> Can't set -labelFont to `Courier 12 bold' for
>>> Tk::LabEntry=HASH(0x1067dac0): unknown option "-labelFont" at
>>> /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Derived.pm line 294.
>>> 
>>> ?at /usr/lib/perl5/vendor_perl/5.10/i686-cygwin/Tk/Derived.pm line 306
>>> thrall@pc1163-8413-xp ~ $ cygcheck -cd perl perl-Tk Cygwin Package
>>> Information Package ? ? ? ? ? ? ?Version cygwin ? ? ? ? ? ? ? 1.7.7-1
>>> perl ? ? ? ? ? ? ? ? 5.10.1-4 perl-Tk ? ? ? ? ? ? ?804.029-1
>>> 
>> 
>> It seems I have unfairly blamed Perl-Tk for these problems; reverting
> to perl-5.10.1-3 fixes both the OP's Pixmap problem and the widget
> problem on my machine.
> 
> I hear.
> Known problem with certain XS modules.
> 
> With -4 I had to recompile core and all XS modules and apparently some
> old modules are not binary compatible anymore, although the
> configuration did not change. Only the environment did change.
> 
> The solution is to recompile the failing XS modules or revert perl back
> to -3
> perl-Tk would need an upgrade against -4.

I'm just glad to have a workaround :)

Thanks for the explanation!
--
Bryan Thrall
FlightSafety International
bryan.thrall@flightsafety.com
? 



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