Re^3: pack() returns an unusable string

[tybalt89]

And here's a version with Data::Dumper and some config vars that also works.

#!/usr/bin/perl -l

use strict; # https://perlmonks.org/?node_id=11133064
use warnings;

my $template = 'd<';
my $nv = 2.4;
$nv = 4135;                     # NOTE errors for this number
my $p = pack $template, $nv;
use Data::Dumper;
$Data::Dumper::Terse = $Data::Dumper::Useqq = 1;
my $s = Dumper $p;
print ">$s<\n";

system $^X, '-wle', "use strict; print unpack('H*', $s);";

Outputs:

>"\0\0\0\0\0'\260\@"
<

000000000027b040

note that it adds a newline, but perl doesn't care.

[syphilis]

And here's a version with Data::Dumper and some config vars that also works

Neither this nor the rendition using Data::Dump works for me on Windows:

C:\_32\pscrpt>type test3.pl

use strict; # https://perlmonks.org/?node_id=11133064
use warnings;

my $template = 'd<';
my $nv = 2.4;
$nv = 4135;                     # NOTE errors for this number
my $p = pack $template, $nv;
use Data::Dumper;
$Data::Dumper::Terse = $Data::Dumper::Useqq = 1;
my $s = Dumper $p;
print ">$s<\n";

system $^X, '-wle', "use strict; print unpack('H*', $s);";

C:\_32\pscrpt>perl test3.pl
>"\0\0\0\0\0'\260\@"
<
syntax error at -e line 1, at EOF
Execution of -e aborted due to compilation errors.

C:\_32\pscrpt>

I guess it's something to do with Windows command line quoting rules.
Mind you, having it work on Windows specifically is not important.
Now that I have a working example, I can while away some time porting your fix to Windows when I have nothing better to do.

Thanks tybalt89 !!

Cheers,
Rob

Thanks

[tybalt89]

Just another guess (to tweak GrandFather) because I don't have a Windows system to test on.

#!/usr/bin/perl -l

use strict; # https://perlmonks.org/?node_id=11133064
use warnings;

my $template = 'd<';
my $nv = 2.4;
$nv = 4135;                     # NOTE errors for this number
my $p = pack $template, $nv;
use Data::Dump qw(pp);
my $s = (pp $p) =~ s/"(.*)"/qq($1)/sr; # tweak for different delimiter
print ">$s<\n";

system $^X, '-wle', "use strict; print unpack('H*', $s);";

[syphilis]

Just another guess ...

Yes, that works fine on Windows as is:

C:\_32\pscrpt>perl test4.pl
>qq(\0\0\0\0\0'\xB0\@)<
000000000027b040

But not when I change $template to "D<" and $nv to 2.4:

C:\_32\pscrpt>perl test4.pl
>pack(qq(H*","9a999999999999990040000000000000))<
syntax error at -e line 1, at EOF
Execution of -e aborted due to compilation errors.

(I can dig into this later if you're getting tired of it.)

Cheers,
Rob