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Strange Win32::MsgBox behavior with PAR

by ZlR (Chaplain)
on Aug 30, 2006 at 15:15 UTC ( #570406=perlquestion: print w/replies, xml ) Need Help??
ZlR has asked for the wisdom of the Perl Monks concerning the following question:

Hello Monkz !

Now I have (to me at least) a very strange problem ...

Let's say i do this :

use strict ; use warnings ; use Win32 ; $SIG{ __DIE__ } = sub { Win32::MsgBox ("Error : @_" , 0, $0 ) } ; die "ARRG" ;
When i run this from the command line i get a single warning pop up .

Now if use PAR with :

pp -gui -o tt.exe

Then the exe will yield the pop up windows but i will have to click 4 times "OK" to get rid of it !

I'm under XP SP2 ActiveState 5.8. Why, oh, why ??

Update : I thought i should elaborate on why i do this : running an exe with the -gui option is much nicer to the user since it will not launch a "useless" background cmd window. but on the other end it will hide all the error message into nowheresville, unless of course i redirect stderr to a file, but still : it seems better if the error is shown immediatly, hence the MsgBox . Along with this I present the result by calling notepad on a temporary file. This allows me to have a simple "only graphical" interface without using Tk .

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Re: Strange Win32::MsgBox behavior with PAR
by cdarke (Prior) on Aug 30, 2006 at 18:07 UTC
    You had no replies, so I thought I'd try it. If it is any consolation I reproduced your problem easily, I'm using XP SP2 with ActiveState perl 5.8.8 and PAR 0.952. I spotted a comment in the PAR documentation concerning Glade and stack unwinding as a bug - possibly related?
    As an alternative work-around:
    use strict ; use warnings ; use Win32 ; sub die_handler { Win32::MsgBox ("Error : @_" , 0, $0 ) } ; eval {die "ARRG" }; die_handler ("$@") if $@; print "Ended OK\n";
    Seems to work correctly. I suggest you use this method of trapping die's, and report a bug to the PAR guys.
      Hi cdarke,

      Thanks for your solution. Since this means i must eval die and "handle" every time the program dies I simply wrote a

      personal_death  { Win32::MsgBox ("Error :  @_ " ,  0, $0 ) ; exit }

      function . I use it instead of die thru all the code .

      Now this is certainly not as clean as the SIG{__DIE__} option, so i reported a bug .


      $SIG{ __DIE__ } = sub { Win32::MsgBox ("Error : @_ " , 0, $0 ); exit(1 +); } ;

      ... is the way to do it !

Re: Strange Win32::MsgBox behavior with PAR
by Anonymous Monk on Aug 31, 2006 at 06:26 UTC
    You have to click 4 times because you get 4 pop-ups.

    If you add caller information, you can see

    $SIG{ __DIE__ } = sub { $b=join '|',caller(0);Win32::MsgBox ("Error : + @_ ($b)" , 0, $0 ) } ;
    The PAR team would probably consider this an oversight (bug). This is the code which ultimately executes your program.
    $ENV{PAR_0} = $filename; # for Pod::Usage { do 'main'; CORE::exit($1) if ($@ =~/^_TK_EXIT_\((\d+)\)/); die $@ if $@; exit; }

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