Pipe(3) User Contributed Perl Documentation Pipe(3)NAME
Win32::Pipe - Win32 Named Pipe
SYNOPSIS
To use this extension, follow these basic steps. First, you need to
'use' the pipe extension:
use Win32::Pipe;
Then you need to create a server side of a named pipe:
$Pipe = new Win32::Pipe("My Pipe Name");
or if you are going to connect to pipe that has already been created:
$Pipe = new Win32::Pipe("\\\\server\\pipe\\My Pipe Name");
NOTE: The "\\\\server\\pipe\\" is necessary when connecting
to an existing pipe! If you are accessing the same
machine you could use "\\\\.\\pipe\\" but either way
works fine.
You should check to see if $Pipe is indeed defined otherwise there has
been an error.
Whichever end is the server, it must now wait for a connection...
$Result = $Pipe->Connect();
NOTE: The client end does not do this! When the client creates
the pipe it has already connected!
Now you can read and write data from either end of the pipe:
$Data = $Pipe->Read();
$Result = $Pipe->Write("Howdy! This is cool!");
When the server is finished it must disconnect:
$Pipe->Disconnect();
Now the server could "Connect" again (and wait for another client) or
it could destroy the named pipe...
$Data->Close();
The client should "Close" in order to properly end the session.
DESCRIPTION
General Use
This extension gives Win32 Perl the ability to use Named Pipes. Why?
Well considering that Win32 Perl does not (yet) have the ability to
"fork" I could not see what good the "pipe(X,Y)" was. Besides, where I
am as an admin I must have several perl daemons running on several NT
Servers. It dawned on me one day that if I could pipe all these
daemons' output to my workstation (across the net) then it would be
much easier to monitor. This was the impetus for an extension using
Named Pipes. I think that it is kinda cool. :)
Benefits
And what are the benefits of this module?
· You may create as many named pipes as you want (uh, well, as many
as your resources will allow).
· Currently there is a limit of 256 instances of a named pipe (once a
pipe is created you can have 256 client/server connections to that
name).
· The default buffer size is 512 bytes; this can be altered by the
"ResizeBuffer" method.
· All named pipes are byte streams. There is currently no way to
alter a pipe to be message based.
· Other things that I cannot think of right now... :)
CONSTRUCTOR
new ( NAME )
Creates a named pipe if used in server context or a connection to
the specified named pipe if used in client context. Client context
is determined by prepending $Name with "\\\\".
Returns true on success, false on failure.
METHODS
BufferSize ()
Returns the size of the instance of the buffer of the named pipe.
Connect ()
Tells the named pipe to create an instance of the named pipe and
wait until a client connects. Returns true on success, false on
failure.
Close ()
Closes the named pipe.
Disconnect ()
Disconnects (and destroys) the instance of the named pipe from the
client. Returns true on success, false on failure.
Error ()
Returns the last error messages pertaining to the named pipe. If
used in context to the package. Returns a list containing
"ERROR_NUMBER" and "ERROR_TEXT".
Read ()
Reads from the named pipe. Returns data read from the pipe on
success, undef on failure.
ResizeBuffer ( SIZE )
Sets the size of the buffer of the instance of the named pipe to
"SIZE". Returns the size of the buffer on success, false on
failure.
Write ( DATA )
Writes "DATA" to the named pipe. Returns true on success, false on
failure.
LIMITATIONS
What known problems does this thing have?
· If someone is waiting on a "Read" and the other end terminates then
you will wait for one REALLY long time! (If anyone has an idea on
how I can detect the termination of the other end let me know!)
· All pipes are blocking. I am considering using threads and
callbacks into Perl to perform async IO but this may be too much
for my time stress. ;)
· There is no security placed on these pipes.
· This module has neither been optimized for speed nor optimized for
memory consumption. This may run into memory bloat.
INSTALLATION NOTES
If you wish to use this module with a build of Perl other than
ActivePerl, you may wish to fetch the source distribution for this
module. The source is included as part of the "libwin32" bundle, which
you can find in any CPAN mirror here:
modules/by-authors/Gurusamy_Sarathy/libwin32-0.151.tar.gz
The source distribution also contains a pair of sample client/server
test scripts. For the latest information on this module, consult the
following web site:
http://www.roth.net/perl
AUTHOR
Dave Roth <rothd@roth.net>
DISCLAIMER
I do not guarantee ANYTHING with this package. If you use it you are
doing so AT YOUR OWN RISK! I may or may not support this depending on
my time schedule.
COPYRIGHT
Copyright (c) 1996 Dave Roth. All rights reserved. This program is
free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
perl v5.14.2 2005-09-17 Pipe(3)
