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How do I get the output of Win32::Process command in Perl?


How do I get the output of Win32::Process command in Perl?

By : komal
Date : November 21 2020, 07:01 PM
help you fix your problem Win32::Process is one of those modules that's basically a straight port of the Win32 API into Perl and thus makes little sense to a Perl programmer. Unless you want to do something very Windows specific, there are better ways to do it.
If all you want is to get the output of a process, you can just run it normally using Perl's backticks.
code :


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Perl - Win32 - How to do a non-blocking read of a filehandle from another process?

Perl - Win32 - How to do a non-blocking read of a filehandle from another process?


By : Jeremy L. Gaddis
Date : March 29 2020, 07:55 AM
I wish this helpful for you This thread on Perlmonks suggests you can make a socket nonblocking on Windows in Perl this way:
code :
ioctl($socket, 0x8004667e, 1);
How do I get output in a Perl process started from Win32::Process?

How do I get output in a Perl process started from Win32::Process?


By : Richard Martin
Date : March 29 2020, 07:55 AM
hope this fix your issue Update: Based on your comments, I get the feeling that your programs are not examples of best practices on Linux or Windows. However, I am sure, when reading the documentation for Win32::Process, you noticed that you can call the Kill method on the process to terminate it. So, I changed the example below to do that.
Your chances of getting useful help increase exponentially if you provide real code. Here are the arguments to Win32::Process::Create:
code :
#!/usr/bin/perl

use strict;
use warnings;

use Win32;
use Win32::Process;

$| = 1;

my $p;

print "Starting child process ... \n";

Win32::Process::Create(
    $p,
    'c:/opt/perl/bin/perl.exe',
    'perl hello.pl',
    1,
    NORMAL_PRIORITY_CLASS,
    '.',
) or die Win32::FormatMessage( Win32::GetLastError() );

print "Waiting three seconds before killing 'hello.pl'\n";

for (1 .. 3) {
    print;
    sleep 1;
}
$p->Kill(0)
    or die "Cannot kill '$p'";
#!/usr/bin/perl

$| = 1;

print "Hello World\n";
print "Sleeping 1000 seconds\n";

for (1 .. 1000) {
    sleep 1;
    print '.';
}
Starting child process ...
Waiting three seconds before killing 'hello.pl'
1Hello World
Sleeping 1000 seconds
2.3.
How can I complete the process in Win32 on behalf of the process in Perl?

How can I complete the process in Win32 on behalf of the process in Perl?


By : HPI
Date : March 29 2020, 07:55 AM
will help you If this is about the process remaining around in "server mode" after automation, you can just call the quit method on the application object. I edited by answer at How can I run a macro in an Excel file I open with Perl? to include that. (You know, I thought if I told you that it was an Application object, you could read the MS documentation on that object to figure out what you wanted to do. )
code :
use strict;
use warnings;
use English qw<$OS_ERROR>;
use File::Spec;

my $sys32dir = File::Spec->catfile( $ENV{SYSTEMROOT}, 'System32' );
my $tasklist_exe = File::Spec->catfile( $sys32dir, 'tasklist.exe' );
my ( $excel_line ) = grep { /^excel.exe\b/i } `$tasklist_exe`;
# $excel_line: 'EXCEL.EXE  4468 Console  1  20,968 K

# The PID is the second column
my ( undef, $pid ) = split qr{\s+}, $excel_line;

if ( my $rc = system( File::Spec->catfile( $sys32dir, 'taskkill.exe' )
   , '/PID', $pid 
   )) {
    die ( $OS_ERROR + 0 ) . ' - ' . $OS_ERROR;
}
Start perl script with Win32::Process::Create

Start perl script with Win32::Process::Create


By : user7019908
Date : March 29 2020, 07:55 AM
hope this fix your issue According to your comment, Windows says it created the process. Accoding to your question, you even have its process id of the process you claim never got created. I'm gonna go out on a limb and say you are mistaken.
You should now check what code the process ended with. perl -E'say $!=THECODE;' might give you a hint. But chances are it's because you tell Perl to execute a file named 'C:\Users\script.pl' (as opposed to C:\Users\script.pl).
How to redirect output of Win32::Process command to text file?

How to redirect output of Win32::Process command to text file?


By : user7224359
Date : March 29 2020, 07:55 AM
To fix the issue you can do You are specifying DETACHED_PROCESS when you start the process. The effect of this is the following:
code :
#!/usr/bin/env perl

use strict;
use warnings;

use File::Which qw(which);
use Win32;
use Win32::Process;

open OLDOUT, ">&STDOUT";
open OLDERR, ">&STDERR";

my $file = 'output.txt';

open STDOUT, ">$file";
open STDERR, ">&STDOUT";

my $timeout = 15 * 1_000;
my ($proc, $exit);
my $exe = which 'cmd.exe';
Win32::Process::Create($proc, $exe, 'cmd /c "echo hello from spawned process"', 1, 0, '.');
$proc->Wait($timeout);
$proc->GetExitCode($exit);

print "Doing work ...\n"; sleep 3;

print "Spawned process exited with $exit\n";

close STDERR;
close STDOUT;
open STDERR, ">&OLDERR";
open STDOUT, ">&OLDOUT";
close OLDERR;
close OLDOUT;
$ perl main.pl

$ type output.txt
hello from spawned process
Doing work ...
Spawned process exited with 0
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