I'm trying to execute external commands that may need Unicode pathnames, from a Perl script on Windows. Please see https://perlmonks.org/?node_id=11141819, where it was suggested that I try using IPC::run3 to pass parameters. I haven't been able to get it to work. The fact that I get the same result whether or not I include the parameter list makes me believe that the parameters aren't being passed to sacd_extract.exe. What am I doing wrong? Thanks.

Code:

use v5.16;
use strict;
use warnings;
use open qw(:std :utf8); # Set the default encoding for STDIN, STDOUT 
+& STDERR to UTF-8 
use IPC::Run3 qw( run3 );

my $filepath = shift;
my @extractcmd1 = qw( sacd_extract.exe );
my @tempoutput1 = GetCommandOutput( @extractcmd1 );
my @extractcmd2 = qw( sacd_extract.exe --print --export-cue );
my @tempoutput2 = GetCommandOutput( @extractcmd2, qq(input=$filepath) 
+);
open( my $fh, ">:raw", "run3.txt" );
print( $fh "~~~$_" ) foreach (@tempoutput2);

sub GetCommandOutput # (command-string [, params])
{
    my $stdout = '';
    my $stderr = '';
    my $exe = $_[0];
    print "Command: "; 
    print qq('$_' ) foreach (@_); 
    print "\n";
    eval { run3 \@_, \undef, \$stdout, \$stderr };
    if        ( $@ )    
        { say "$exe error: $@"; }
    elsif    ( $? & 0x7F )    
        { say "$exe killed by signal ".( $? & 0x7F ); }
    elsif    ( $? >> 8 )    
        { say "$exe exited with error ".( $? >> 8 ); }
    else                        
        { say "$exe completed successfully"; }
    say "stdout=$stdout";
    say "stderr=$stderr";
    return map { chomp; $_ } split(/\n/, $stdout);
}
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Output

D:\test>perl -S test-run3.pl "E:\Temp\Greatest Hits.iso"
Command: 'sacd_extract.exe'
sacd_extract.exe completed successfully
stdout=

stderr=No such file or directory
libsacdread: Can't stat /dev/cdrom

Command: 'sacd_extract.exe' '--print' '--export-cue' 'input=E:\Temp\Gr
+eatest Hits.iso'
sacd_extract.exe completed successfully
stdout=

stderr=No such file or directory
libsacdread: Can't stat /dev/cdrom
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UPDATE: Oops, I accidentally left out '--' on 'input='; that's why this one didn't work. That sample script is working now, but the one I'm really trying to get working is this one:

use v5.16;
use strict;
use warnings;
use open qw(:std :utf8); # Set the default encoding for STDIN, STDOUT 
+& STDERR to UTF-8 
use Encode qw( decode );
use IPC::Run3 qw( run3 );

use constant CORECONVERTEREXE => 'C:\Program Files\dBpoweramp\coreconv
+erter.exe';
my $filepath = shift;
my @convcmd = ( 
    "${\CORECONVERTEREXE}", "-outfile=nul", "-convert_to=wave", "-erro
+rfile=core.err", 
    qq(-infile=$filepath)
);
my $tempoutput1 = decode( 'UTF-16LE', GetCommandOutput(@convcmd) );
print "$tempoutput1\n";

sub GetCommandOutput # (command-string [, params])
{
    my $stdout = '';
    my $stderr = '';
    my $exe = $_[0];
    print "Command: "; 
    print qq('$_' ) foreach (@_); 
    print "\n";
    eval { run3 \@_, \undef, \$stdout, \$stderr };
    if        ( $@ )    
        { say "$exe error: $@"; }
    elsif    ( $? )    
        { say "$exe exited with code $?"; }
    else
        { say "$exe completed successfully"; }
    return $stdout;
}
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Output:

D:\test>perl -S test-run3conv.pl "E:\Temp\Greatest Hits.iso"
Command: 'C:\Program Files\dBpoweramp\coreconverter.exe' '-outfile=nul
+' '-convert_to=wave' '-errorfile=core.err' '-infile=E:\Temp\Greatest 
+Hits.iso'
C:\Program Files\dBpoweramp\coreconverter.exe exited with code 256

dBpoweramp Music Converter           (C) 2021 Illustrate Ltd

Encoding: wave"
Audio Source: E:\Temp\Greatest
Audio Destination: nul"

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