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Re: Conditional use of Win32::TieRegistry

by pryrt (Monsignor)
on Nov 13, 2017 at 19:57 UTC ( #1203289=note: print w/replies, xml ) Need Help??

in reply to Conditional use of Win32::TieRegistry

hilitai, with the ideas generated by the other Monks, I was able to come up with this, which worked for me on Win7 strawberry 5.24.1 and linux perl 5.8.5.

#!/usr/bin/perl use strict; use warnings; my $usemod; # if you initialize `my $usemod = 0;`, then the BEGIN +block's assignment to $usemod is overridden, which you don't want our $Registry; # this will be overridden by Win32::TieRegistry's expo +rt of $Registry if in Windows, but BEGIN { local $\ = "\n"; if( $^O eq 'MSWin32' ) { eval { require Win32::TieRegistry; Win32::TieRegistry->import( Delimiter => '/' ); $usemod = 1; } } } if ($usemod) { my $IEKey = $Registry->{'HKEY_CURRENT_USER/Software/Microsoft/Inte +rnet Explorer/Main/'}; print "IEKey = '$IEKey'\n"; } else { print "None of that stuff here\n"; }
  • my 5.8.5 linux perl didn't like the use if ... (edit: or, at least, the way I tried... with some debug, it may have eventually worked), so I went with Discipulus's BEGIN block idea to make that run first

  • removing the = 0 on my $usemod; allowed the $usemod variable to update in the BEGIN block
  • used Perlbotics' suggestion of ->import(), though I included your Delimiter => '/' argument to the import
  • made $Registry a package variable using our, which then allowed the Win32::TieRegistry->import() to clobber it with the defined version from the module, while still allowing linux perl to compile the script

edit#2: added use warnings; per best practices

edit#3: added "perl" to "linux perl 5.8.5", so it wasn't implying that was the version of linux, but rather the version of perl

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Re^2: Conditional use of Win32::TieRegistry
by hilitai (Monk) on Nov 13, 2017 at 20:23 UTC

    Yes! Thank you all very much (and especially pryrt and haukex, who taught me something new today).

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