perlfaq2.1

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

at http://nntp.perl.org/group/ and these lists are also available
under the \f(CW\*(C`perl.*\*(C'\fR hierarchy at http://groups.google.com . Other
groups are listed at http://lists.perl.org/ ( also known as
http://lists.cpan.org/ ).
.PP
A nice place to ask questions is the PerlMonks site,
http://www.perlmonks.org/ , or the Perl Beginners mailing list
http://lists.perl.org/showlist.cgi?name=beginners .
.PP
Note that none of the above are supposed to write your code for you:
asking questions about particular problems or general advice is fine,
but asking someone to write your code for free is not very cool.
.Sh "Where should I post source code?"
.IX Subsection "Where should I post source code?"
You should post source code to whichever group is most appropriate, but
feel free to cross-post to comp.lang.perl.misc.  If you want to cross-post
to alt.sources, please make sure it follows their posting standards,
including setting the Followup-To header line to \s-1NOT\s0 include alt.sources;
see their \s-1FAQ\s0 ( http://www.faqs.org/faqs/alt\-sources\-intro/ ) for details.
.PP
If you're just looking for software, first use Google
( http://www.google.com ), Google's usenet search interface
( http://groups.google.com ),  and \s-1CPAN\s0 Search ( http://search.cpan.org ).
This is faster and more productive than just posting a request.
.Sh "Perl Books"
.IX Subsection "Perl Books"
A number of books on Perl and/or \s-1CGI\s0 programming are available.  A few
of these are good, some are \s-1OK\s0, but many aren't worth your money.
There is a list of these books, some with extensive reviews, at
http://books.perl.org/ . If you don't see your book listed here, you
can write to perlfaq\[e-mail] .
.PP
The incontestably definitive reference book on Perl, written by
the creator of Perl, is Programming Perl:
.PP
.Vb 5
\&        Programming Perl (the "Camel Book"):
\&        by Larry Wall, Tom Christiansen, and Jon Orwant
\&        ISBN 0\-596\-00027\-8  [3rd edition July 2000]
\&        http://www.oreilly.com/catalog/pperl3/
\&        (English, translations to several languages are also available)
.Ve
.PP
The companion volume to the Camel containing thousands
of real-world examples, mini-tutorials, and complete programs is:
.PP
.Vb 5
\&        The Perl Cookbook (the "Ram Book"):
\&        by Tom Christiansen and Nathan Torkington,
\&            with Foreword by Larry Wall
\&        ISBN 0\-596\-00313\-7 [2nd Edition August 2003]
\&        http://www.oreilly.com/catalog/perlckbk2/
.Ve
.PP
If you're already a seasoned programmer, then the Camel Book might
suffice for you to learn Perl.  If you're not, check out the
Llama book:
.PP
.Vb 4
\&        Learning Perl
\&        by Randal L. Schwartz, Tom Phoenix, and brian d foy
\&        ISBN 0\-596\-10105\-8 [4th edition July 2005]
\&        http://www.oreilly.com/catalog/learnperl4/
.Ve
.PP
And for more advanced information on writing larger programs,
presented in the same style as the Llama book, continue your education
with the Alpaca book:
.PP
.Vb 4
\&        Intermediate Perl (the "Alpaca Book")
\&        by Randal L. Schwartz and brian d foy, with Tom Phoenix (foreword by Damian Conway)
\&        ISBN 0\-596\-10206\-2 [1st edition March 2006]
\&        http://www.oreilly.com/catalog/lrnperlorm/
.Ve
.PP
Addison-Wesley ( http://www.awlonline.com/ ) and Manning
( http://www.manning.com/ ) are also publishers of some fine Perl books
such as \fIObject Oriented Programming with Perl\fR by Damian Conway and
\&\fINetwork Programming with Perl\fR by Lincoln Stein.
.PP
An excellent technical book discounter is Bookpool at
http://www.bookpool.com/ where a 30% discount or more is not unusual.
.PP
What follows is a list of the books that the \s-1FAQ\s0 authors found personally
useful.  Your mileage may (but, we hope, probably won't) vary.
.PP
Recommended books on (or mostly on) Perl follow.
.IP "References" 4
.IX Item "References"
.Vb 4
\&        Programming Perl
\&        by Larry Wall, Tom Christiansen, and Jon Orwant
\&        ISBN 0\-596\-00027\-8 [3rd edition July 2000]
\&        http://www.oreilly.com/catalog/pperl3/
\&
\&        Perl 5 Pocket Reference
\&        by Johan Vromans
\&        ISBN 0\-596\-00032\-4 [3rd edition May 2000]
\&        http://www.oreilly.com/catalog/perlpr3/
.Ve
.IP "Tutorials" 4
.IX Item "Tutorials"
.Vb 4
\&        Beginning Perl
\&        by James Lee
\&        ISBN 1\-59059\-391\-X [2nd edition August 2004]
\&        http://apress.com/book/bookDisplay.html?bID=344
\&
\&        Elements of Programming with Perl
\&        by Andrew L. Johnson
\&        ISBN 1\-884777\-80\-5 [1st edition October 1999]
\&        http://www.manning.com/johnson/
\&
\&        Learning Perl
\&        by Randal L. Schwartz, Tom Phoenix, and brian d foy
\&        ISBN 0\-596\-10105\-8 [4th edition July 2005]
\&        http://www.oreilly.com/catalog/learnperl4/
\&
\&        Intermediate Perl (the "Alpaca Book")
\&        by Randal L. Schwartz and brian d foy, with Tom Phoenix (foreword by Damian Conway)
\&        ISBN 0\-596\-10206\-2 [1st edition March 2006]
\&        http://www.oreilly.com/catalog/intermediateperl/
\&
\&        Mastering Perl
\&        by brian d foy
\&        ISBN 0\-596\-52724\-1 [1st edition July 2007]
\&        http://www.oreilly.com/catalog/9780596527242/
.Ve
.IP "Task-Oriented" 4
.IX Item "Task-Oriented"
.Vb 4
\&        Writing Perl Modules for CPAN
\&        by Sam Tregar
\&        ISBN 1\-59059\-018\-X [1st edition Aug 2002]
\&        http://apress.com/book/bookDisplay.html?bID=14
\&
\&        The Perl Cookbook
\&        by Tom Christiansen and Nathan Torkington
\&            with foreword by Larry Wall
\&        ISBN 1\-56592\-243\-3 [1st edition August 1998]
\&        http://www.oreilly.com/catalog/cookbook/
\&
\&        Effective Perl Programming
\&        by Joseph Hall
\&        ISBN 0\-201\-41975\-0 [1st edition 1998]
\&        http://www.awl.com/
\&
\&        Real World SQL Server Administration with Perl
\&        by Linchi Shea
\&        ISBN 1\-59059\-097\-X [1st edition July 2003]
\&        http://apress.com/book/bookDisplay.html?bID=171
.Ve
.IP "Special Topics" 4
.IX Item "Special Topics"
.Vb 4
\&        Perl Best Practices
\&        by Damian Conway
\&        ISBN: 0\-596\-00173\-8 [1st edition July 2005]
\&        http://www.oreilly.com/catalog/perlbp/
\&
\&        Higher Order Perl
\&        by Mark\-Jason Dominus
\&        ISBN: 1558607013 [1st edition March 2005]
\&        http://hop.perl.plover.com/
\&
\&        Perl 6 Now: The Core Ideas Illustrated with Perl 5
\&        by Scott Walters
\&        ISBN 1\-59059\-395\-2 [1st edition December 2004]
\&        http://apress.com/book/bookDisplay.html?bID=355
\&
\&        Mastering Regular Expressions
\&        by Jeffrey E. F. Friedl
\&        ISBN 0\-596\-00289\-0 [2nd edition July 2002]
\&        http://www.oreilly.com/catalog/regex2/
\&
\&        Network Programming with Perl
\&        by Lincoln Stein
\&        ISBN 0\-201\-61571\-1 [1st edition 2001]
\&        http://www.awlonline.com/
\&
\&        Object Oriented Perl
\&        Damian Conway
\&            with foreword by Randal L. Schwartz
\&        ISBN 1\-884777\-79\-1 [1st edition August 1999]
\&        http://www.manning.com/conway/
\&
\&        Data Munging with Perl
\&        Dave Cross
\&        ISBN 1\-930110\-00\-6 [1st edition 2001]
\&        http://www.manning.com/cross
\&
\&        Mastering Perl/Tk
\&        by Steve Lidie and Nancy Walsh
\&        ISBN 1\-56592\-716\-8 [1st edition January 2002]
\&        http://www.oreilly.com/catalog/mastperltk/
\&
\&        Extending and Embedding Perl
\&        by Tim Jenness and Simon Cozens
\&        ISBN 1\-930110\-82\-0 [1st edition August 2002]
\&        http://www.manning.com/jenness
\&
\&        Perl Debugger Pocket Reference
\&        by Richard Foley
\&        ISBN 0\-596\-00503\-2 [1st edition January 2004]
\&        http://www.oreilly.com/catalog/perldebugpr/
\&
\&        Pro Perl Debugging
\&        by Richard Foley with Andy Lester
\&        ISBN 1\-59059\-454\-1 [1st edition July 2005]
\&        http://www.apress.com/book/view/1590594541
.Ve
.Sh "Which magazines have Perl content?"
.IX Subsection "Which magazines have Perl content?"
\&\fIThe Perl Review\fR ( http://www.theperlreview.com ) focuses on Perl
almost completely (although it sometimes sneaks in an article about
another language). There's also \fI\f(CI$foo\fI Magazin\fR, a german magazine
dedicated to Perl, at ( http://www.foo\-magazin.de ).
.PP
Magazines that frequently carry quality articles on Perl include \fIThe
Perl Review\fR ( http://www.theperlreview.com ), \fIUnix Review\fR (
http://www.unixreview.com/ ), \fILinux Magazine\fR (
http://www.linuxmagazine.com/ ), and Usenix's newsletter/magazine to
its members, \fIlogin:\fR ( http://www.usenix.org/ )
.PP
The Perl columns of Randal L. Schwartz are available on the web at
http://www.stonehenge.com/merlyn/WebTechniques/ ,
http://www.stonehenge.com/merlyn/UnixReview/ , and
http://www.stonehenge.com/merlyn/LinuxMag/ .
.PP
The first (and for a long time, only) periodical devoted to All Things
Perl, \fIThe Perl Journal\fR contains tutorials, demonstrations, case
studies, announcements, contests, and much more.  \fI\s-1TPJ\s0\fR has columns
on web development, databases, Win32 Perl, graphical programming,
regular expressions, and networking, and sponsors the Obfuscated Perl
Contest and the Perl Poetry Contests.  Beginning in November 2002, \s-1TPJ\s0
moved to a reader-supported monthly e\-zine format in which subscribers
can download issues as \s-1PDF\s0 documents. In 2006, \s-1TPJ\s0 merged with Dr.
Dobbs Journal (online edition). To read old \s-1TPJ\s0 articles, see
http://www.ddj.com/ .
.Sh "What mailing lists are there for Perl?"
.IX Subsection "What mailing lists are there for Perl?"
Most of the major modules (Tk, \s-1CGI\s0, libwww-perl) have their own
mailing lists.  Consult the documentation that came with the module for
subscription information.
.PP
A comprehensive list of Perl related mailing lists can be found at:
.PP
.Vb 1
\&        http://lists.perl.org/
.Ve
.Sh "Where are the archives for comp.lang.perl.misc?"
.IX Subsection "Where are the archives for comp.lang.perl.misc?"
The Google search engine now carries archived and searchable newsgroup
content.
.PP
http://groups.google.com/groups?group=comp.lang.perl.misc
.PP
If you have a question, you can be sure someone has already asked the
same question at some point on c.l.p.m. It requires some time and patience
to sift through all the content but often you will find the answer you
seek.
.Sh "Where can I buy a commercial version of perl?"
.IX Subsection "Where can I buy a commercial version of perl?"
In a real sense, perl already \fIis\fR commercial software: it has a license
that you can grab and carefully read to your manager. It is distributed
in releases and comes in well-defined packages. There is a very large
user community and an extensive literature.  The comp.lang.perl.*
newsgroups and several of the mailing lists provide free answers to your
questions in near real-time.  Perl has traditionally been supported by
Larry, scores of software designers and developers, and myriad
programmers, all working for free to create a useful thing to make life
better for everyone.
.PP
However, these answers may not suffice for managers who require a
purchase order from a company whom they can sue should anything go awry.
Or maybe they need very serious hand-holding and contractual obligations.
Shrink-wrapped CDs with perl on them are available from several sources if
that will help.  For example, many Perl books include a distribution of perl,
as do the O'Reilly Perl Resource Kits (in both the Unix flavor
and in the proprietary Microsoft flavor); the free Unix distributions
also all come with perl.
.Sh "Where do I send bug reports?"
.IX Subsection "Where do I send bug reports?"
If you are reporting a bug in the perl interpreter or the modules
shipped with Perl, use the \fIperlbug\fR program in the Perl distribution or
mail your report to [e-mail] or at http://rt.perl.org/perlbug/ .
.PP
For Perl modules, you can submit bug reports to the Request Tracker set
up at http://rt.cpan.org .
.PP
If you are posting a bug with a non-standard port (see the answer to
\&\*(L"What platforms is perl available for?\*(R"), a binary distribution, or a
non-standard module (such as Tk, \s-1CGI\s0, etc), then please see the
documentation that came with it to determine the correct place to post
bugs.
.PP
Read the \fIperlbug\fR\|(1) man page (perl5.004 or later) for more information.
.Sh "What is perl.com? Perl Mongers? pm.org? perl.org? cpan.org?"
.IX Subsection "What is perl.com? Perl Mongers? pm.org? perl.org? cpan.org?"
Perl.com at http://www.perl.com/ is part of the O'Reilly Network, a
subsidiary of O'Reilly Media.
.PP
The Perl Foundation is an advocacy organization for the Perl language
which maintains the web site http://www.perl.org/ as a general
advocacy site for the Perl language. It uses the domain to provide
general support services to the Perl community, including the hosting
of mailing lists, web sites, and other services.  There are also many
other sub-domains for special topics like learning Perl, Perl news, jobs
in Perl, such as:
.PP
.Vb 4
\&        http://learn.perl.org/
\&        http://use.perl.org/
\&        http://jobs.perl.org/
\&        http://lists.perl.org/
.Ve
.PP
Perl Mongers uses the pm.org domain for services related to Perl user
groups, including the hosting of mailing lists and web sites.  See the
Perl user group web site at http://www.pm.org/ for more information about
joining, starting, or requesting services for a Perl user group.
.PP
http://www.cpan.org/ is the Comprehensive Perl Archive Network,
a replicated worldwide repository of Perl software, see
the \fIWhat is \s-1CPAN\s0?\fR question earlier in this document.
.SH "REVISION"
.IX Header "REVISION"
Revision: \f(CW$Revision:\fR 10144 $
.PP
Date: \f(CW$Date:\fR 2007\-10\-31 13:50:01 +0100 (Wed, 31 Oct 2007) $
.PP
See perlfaq for source control details and availability.
.SH "AUTHOR AND COPYRIGHT"
.IX Header "AUTHOR AND COPYRIGHT"
Copyright (c) 1997\-2007 Tom Christiansen, Nathan Torkington, and
other authors as noted. All rights reserved.
.PP
This documentation is free; you can redistribute it and/or modify it
under the same terms as Perl itself.
.PP
Irrespective of its distribution, all code examples here are in the public
domain.  You are permitted and encouraged to use this code and any
derivatives thereof in your own programs for fun or for profit as you
see fit.  A simple comment in the code giving credit to the \s-1FAQ\s0 would
be courteous but is not required.