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22.14. Win32::Process

This module provides access to extended
Win32 process creation and management abilities. Process objects are
created with the Create method (the constructor).
Additional methods can be used on objects to kill, suspend, resume,
and set the priorities of processes.

The Create constructor has the following syntax:

Win32::Process->Create($Proc, app, cmnd, hndls, opts, dir)

The arguments to Create are as follows:

$Proc

Name of the reference for the created process object.

app

Full pathname of the executable.

cmnd

Command line for executable.

hndls

Determines handle inheritance. A value of 1 turns
on inheritance; a 0 value turns it off.

opts

Sets options to implement when the process is created. The available
options for this argument are listed below.

dir

The working directory for the executable.

The process is created by passing the command line in
cmnd to the executable named in
app. For example, a process object for a
text file running in Notepad is created like this:

use Win32::Process;
Win32::Process->Create($proc, ''C:\\windows\\Notepad.exe'',
"Notepad perlnut.txt", 1, 
DETACHED_PROCESS, ".");

The process creation options given by the
opts argument to Create
are:

CREATE_DEFAULT_ERROR_MODE

Gives the process the default error mode.

CREATE_NEW_CONSOLE

Creates a new console for the process. Can''t be used
with DETACHED_PROCESS.

CREATE_NO_CONSOLE

Creates a new process, but without running the process in a new and
visible window. That is, a new process will be created, but in the
background.

CREATE_NEW_PROCESS_GROUP

Creates process as root of a new process group.

CREATE_SEPARATE_WOW_VDM

Runs process in its own Virtual DOS Machine (VDM). Only applicable to
16-bit applications.

CREATE_SUSPENDED

Starts process in a suspended state. The process can be started with
the Resume method.

CREATE_UNICODE_ENVIRONMENT

Uses Unicode characters in the environment block of the new process.

DEBUG_PROCESS

Debugs the new process with the calling process.

DEBUG_ONLY_THIS_PROCESS

Doesn''t debug the new process if calling process is
being debugged.

DETACHED_PROCESS

Creates a process with no access to the console of the calling
process.

22.14.1. Win32::Process Methods

The following methods are provided for objects of created by
Win32::Process.

$proc->GetExitCode($ref)

Gets the exit code of a
process and saves it to
$ref.

$proc->GetPriorityClass($ref)

Gets the priority class of
the process and stores it in
$ref.

$proc->Kill(exitcode)

Kills the process with the
given exitcode, which is returned by the
process.

$proc->Resume

Resumes a suspended process.
This method can also be used on processes created with the
CREATE_SUSPENDED flag.

$proc->SetPriorityClass($priority)

Sets the priority class of
the object to
$priority. The priority
can be one of the following:

IDLE_PRIORITY_CLASS

A process whith threads that run only when the system is idle

NORMAL_PRIORITY_CLASS

A process with normal scheduling

HIGH_PRIORITY_CLASS

A process that performs time-critical tasks that must be executed
immediately

REALTIME_PRIORITY_CLASS

The highest-priority process, even preempts operating-system threads

$proc->Suspend

Suspends the process.

$proc->Wait(n)

Waits
n milliseconds for the process to exit. If
the process times out, the method returns false and sets
$! to WAIT_FAILED. For no
timeout, sets n to
INFINITE.