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Re: How do you pass arguments from Perl to Powershell?

by Util (Priest)
on Nov 18, 2011 at 17:26 UTC ( #938888=note: print w/replies, xml ) Need Help??

in reply to How do you pass arguments from Perl to Powershell?

First, basic debugging: Extract that long command string to a separate var, and print it.

my $cmdline = 'C:\windows\system32\WindowsPowerShell\v1.0\powershell.exe -command "& + D:\scripts\get-info.ps1 "."\'$val1\' "."\'$filename\'"'; print $cmdline, "\n"; Win32::Process::Create( $process, $^X, $cmdline, 0, DETACHED_PROCESS, ".", );
You will see that you are not passing the string that you think. When you put a $var in single quotes, it does not get replaced with the value of $var (interpolation). Double-quoted strings *do* interpolate.

Second, (as Anonymous Monk pointed out), $^X is the wrong thing to pass as second parameter; it would run another copy of Perl, instead of PowerShell. Read the docs, not just example code. The Win32::Process docs say that it is the "full path of the executable module", so in your case, it is probably the full path to PowerShell.

When quoting is complex, it helps to build the string in stages, and sometimes to use q{...} and qq{...} in place of '...' and "...".

Use 0 instead of DETACHED_PROCESS until everything else is working right, so you can better see the errors from PowerShell.

The code below is untested for PowerShell, since I lack it on my Win2k box. I don't know exactly what kind of quoting it expects, or what that & does, but this should get you farther down the path:

use strict; use warnings; use Win32::Process; my $val1 = 'dummy1'; my $filename = 'dummy2'; my $q_val1 = "'" . $val1 . "'"; my $q_filename = "'" . $filename . "'"; my $appname = 'C:\windows\system32\WindowsPowerShell\v1.0\powershell.exe'; my $ps_command = join ' ', ( '&', 'D:\scripts\get-info.ps1', $q_val1, $q_filename, ) my $cmdline = qq{$appname -command "$ps_command"}; print $cmdline, "\n"; my $process; my $rc = Win32::Process::Create( $process, $appname, $cmdline, 0, 0, # replace with DETACHED_PROCESS later ".", ); if ( $rc == 0 ) { print Win32::FormatMessage( Win32::GetLastError() ); } else { print "Success!\n"; }

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Re^2: How do you pass arguments from Perl to Powershell?
by StangMan71 (Initiate) on Nov 21, 2011 at 14:34 UTC

    Thanks so much for your reply. Your suggestions helped me resolve the problem.

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[Corion]: choroba: Ooof! I can imagine that ;)
[Corion]: I think at a Perl workshop some years ago I gave two talks on the same day and after that decided to only submit one talk per event ;)
[LanX]: you play the triangle, right?
[choroba]: just one of its angles, in fact
[LanX]: <|--
[choroba]: Reminds me of an old joke about an orchestra...
erix imagines that in a true Lancs accent
[choroba]: so a Czech orchestra rehearses a new piece by a German composer

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