perlnewmod.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.

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.\" ========================================================================
.\"
.IX Title "PERLNEWMOD 1"
.TH PERLNEWMOD 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
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.SH "NAME"
perlnewmod \- preparing a new module for distribution
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This document gives you some suggestions about how to go about writing
Perl modules, preparing them for distribution, and making them available
via \s-1CPAN\s0.
.PP
One of the things that makes Perl really powerful is the fact that Perl
hackers tend to want to share the solutions to problems they've faced,
so you and I don't have to battle with the same problem again.
.PP
The main way they do this is by abstracting the solution into a Perl
module. If you don't know what one of these is, the rest of this
document isn't going to be much use to you. You're also missing out on
an awful lot of useful code; consider having a look at perlmod,
perlmodlib and perlmodinstall before coming back here.
.PP
When you've found that there isn't a module available for what you're
trying to do, and you've had to write the code yourself, consider
packaging up the solution into a module and uploading it to \s-1CPAN\s0 so that
others can benefit.
.Sh "Warning"
.IX Subsection "Warning"
We're going to primarily concentrate on Perl-only modules here, rather
than \s-1XS\s0 modules. \s-1XS\s0 modules serve a rather different purpose, and
you should consider different things before distributing them \- the
popularity of the library you are gluing, the portability to other
operating systems, and so on. However, the notes on preparing the Perl
side of the module and packaging and distributing it will apply equally
well to an \s-1XS\s0 module as a pure-Perl one.
.Sh "What should I make into a module?"
.IX Subsection "What should I make into a module?"
You should make a module out of any code that you think is going to be
useful to others. Anything that's likely to fill a hole in the communal
library and which someone else can slot directly into their program. Any
part of your code which you can isolate and extract and plug into
something else is a likely candidate.
.PP
Let's take an example. Suppose you're reading in data from a local
format into a hash-of-hashes in Perl, turning that into a tree, walking
the tree and then piping each node to an Acme Transmogrifier Server.
.PP
Now, quite a few people have the Acme Transmogrifier, and you've had to
write something to talk the protocol from scratch \- you'd almost
certainly want to make that into a module. The level at which you pitch
it is up to you: you might want protocol-level modules analogous to
Net::SMTP which then talk to higher level modules analogous
to Mail::Send. The choice is yours, but you do want to get
a module out for that server protocol.
.PP
Nobody else on the planet is going to talk your local data format, so we
can ignore that. But what about the thing in the middle? Building tree
structures from Perl variables and then traversing them is a nice,
general problem, and if nobody's already written a module that does
that, you might want to modularise that code too.
.PP
So hopefully you've now got a few ideas about what's good to modularise.