kgnickl has asked for the wisdom of the Perl Monks concerning the following question:

I wrote the below code trying to redirect all STDERR output to a function which can then handle it accordingly. When I try to print the error in the function it get redirected to its printing the error 2x's, specifically 1x on 2 separate lines..... Any ideas what I'm doing wrong or why this happens? I have ActivePerl and installed the IO-Stringy package. 
use strict;
use Tie::STDERR \&HandleError;

print "Before\n";
die ".....";
print "After\n";

sub HandleError(){ 
    my ($error) = @_;
    &SomeActivity('0',$error);
}

sub SomeActivity(){
    my ($rc, $error) = @_;
    print $rc . "\n" . $error; 
}

[download]


Before
0
..... at C:/ReqProAutomation/Frontend/ProjectSplit/redirecterror.pl line 5.
..... at C:/ReqProAutomation/Frontend/ProjectSplit/redirecterror.pl line 5.

Replies are listed 'Best First'.
Re: Double error when print w/ Tie::STDERR
by Khen1950fx (Canon) on May 11, 2011 at 21:48 UTC
    The documentation for Tie::STDERR is a little sparse, so I used tie_stderr.t. Try this: 
    #!/usr/bin/perl

use strict;
use warnings;

BEGIN { $|=1; }
END   { print "not ok\n" unless $::tiestderrloaded; }

BEGIN { print "Loading Tie::STDERR\n"; }

use Tie::STDERR \&HandleError;
$::tiestderrloaded = 1;

print "Before\n"; 
if ($@) {
    die "....";
}  
print "After\n";

use Tie::STDERR undef;

sub HandleError { 
    my ($error) = @_;
    &SomeActivity('0',$error);
}

sub SomeActivity {
    my ($rc, $error) = @_;
    print $rc . "\n" . $error; 
}

    [download]
[reply]
[d/l]

Back to Seekers of Perl Wisdom