Re: WIN32 calls

[gaggio]

Here a function to list all the processes running on a machine. It uses Win32::Perflib.
Maybe that I did not quite get the purpose of your program, though. Do you want to list only the services running or the tasks? This function returns a pid-indexed hash with all the tasks running on a Win32 machine, as listed in the task manager.
You'll notice, BTW, that the function takes the machine you want to monitor as an argument: it is possible to get the task list of a remote machine. I just decided to publish this function in the Snippets Section also, since it can be useful to somebody else.
If you want to have your perl script run as a service, you might want to use Win32::Daemon from Roth.net. I have used the module and found it very useful.

sub get_remote_process_list {
    
my $server = $_[0];
    
my %rtasks;
my %counter;
    
Win32::PerfLib::GetCounterNames($server, \%counter);
my %r_counter = map { $counter{$_} => $_ } keys %counter;
# retrieve the id for process object
my $process_obj = $r_counter{Process};
# retrieve the id for the process ID counter
my $process_id = $r_counter{'ID Process'};
    
# create connection to $server
my $perflib = new Win32::PerfLib($server);
my $proc_ref = {};
# get the performance data for the process object
$perflib->GetObjectList($process_obj, $proc_ref);
$perflib->Close();
my $instance_ref = $proc_ref->{Objects}->{$process_obj}->{Instances};
foreach my $p (sort keys %{$instance_ref})
{
    my $counter_ref = $instance_ref->{$p}->{Counters};
    foreach my $i (keys %{$counter_ref})
    {
        if($counter_ref->{$i}->{CounterNameTitleIndex} == $process_id)
        {
            $rtasks{$counter_ref->{$i}->{Counter}} = $instance_ref->{$
+p}->{Name};
        }
    }
}
  return %rtasks;
}

[kapper]

he he.. well what you posted here, _was_ excactly what i set out to do... =)

Unfortunatly, I cannot get yours to work (.. my incompetence surely).. it dies at :

$perflib->GetObjectList($process_obj, $proc_ref);

If there is an obvious reason for this, I would be glad to know, otherwise I will just continue hacking away at it myself...

[t0mas]

Win32::PerfLib works only on NT. Maybe only 4.0?

/brother t0mas

[gaggio]

Hmm.
This is weird. Yes, what kind of Windows do you have? I have Win NT 4.0 SP6 with Perl version 5.005_03 built for MSWin32-x86-object (do a Perl -v to check).
Also, what is the error message when it dies?

[t0mas]

When I call GetCounterNames I get a:
Undefined subroutine &Win32::PerfLib::GetCounterNames called at xxx.pl line yy.
I use Win2k and perl, v5.6.0 built for MSWin32-x86-multi-thread (AP613).
Microsoft has probably changed some internal stuff that makes it uncompatible (in their usual care for peoples invested time and money :).

/brother t0mas