Error while conditionally using perl module

Question

if (a == b)
{
    eval "require IO::Compress::Gzip qw(gzip)";
}

This is what I did to include gzip based on a condition, but at run time it gives error as below

Can't locate object method "gzip" via package "IO::Handle" (perhaps you forgot to load "IO::Handle"?)

Any help please? thanks.

Miller · Accepted Answer · 2014-08-07 21:22:16Z

3

To conditionally include a module, use the if pragma

use if ($x == $y), 'IO::Compress::Gzip' => qw(gzip);

Just note that the variables in the CONDITION will have to be package level and initialized in a BEGIN block.

Alternatively, you can use the following:

if ($x == $y) {
    require IO::Compress::Gzip;
    IO::Compress::Gzip->import('gzip');
}

edited Aug 7, 2014 at 21:22

answered Aug 7, 2014 at 21:09

Miller

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6 Comments

rodee Over a year ago

Miller, I used your second solution, got the same error, let me try "use". I am using perl, v5.6.1 Thanks.

Miller Over a year ago

Does doing a basic use statement give that error? use IO::Compress::Gzip qw(gzip); I suspect that there is something else going on with your environment.

rodee Over a year ago

yes, use IO::Compress::Gzip qw(gzip $GzipError); works, but not your alternative solution, may be Perl version 5.6.1 don't have that support?

friedo Over a year ago

Perl 5.6.1 is more than 13 years old. But I don't think that's related to your error.

tobyink Over a year ago

Perl 5.6.1 isn't even the latest Perl 5.6.x release!

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