module::load.3

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 "Module::Load 3"
.TH Module::Load 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Module::Load \- runtime require of both modules and files
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&        use Module::Load;
\&
\&    my $module = \*(AqData:Dumper\*(Aq;
\&    load Data::Dumper;      # loads that module
\&    load \*(AqData::Dumper\*(Aq;    # ditto
\&    load $module            # tritto
\&    
\&    my $script = \*(Aqsome/script.pl\*(Aq
\&    load $script;
\&    load \*(Aqsome/script.pl\*(Aq;      # use quotes because of punctuations
\&    
\&    load thing;             # try \*(Aqthing\*(Aq first, then \*(Aqthing.pm\*(Aq
\&
\&    load CGI, \*(Aq:standard\*(Aq   # like \*(Aquse CGI qw[:standard]\*(Aq
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`load\*(C'\fR eliminates the need to know whether you are trying to require
either a file or a module.
.PP
If you consult \f(CW\*(C`perldoc \-f require\*(C'\fR you will see that \f(CW\*(C`require\*(C'\fR will
behave differently when given a bareword or a string.
.PP
In the case of a string, \f(CW\*(C`require\*(C'\fR assumes you are wanting to load a
file. But in the case of a bareword, it assumes you mean a module.
.PP
This gives nasty overhead when you are trying to dynamically require
modules at runtime, since you will need to change the module notation
(\f(CW\*(C`Acme::Comment\*(C'\fR) to a file notation fitting the particular platform
you are on.
.PP
\&\f(CW\*(C`load\*(C'\fR eliminates the need for this overhead and will just \s-1DWYM\s0.
.SH "Rules"
.IX Header "Rules"
\&\f(CW\*(C`load\*(C'\fR has the following rules to decide what it thinks you want:
.IP "\(bu" 4
If the argument has any characters in it other than those matching
\&\f(CW\*(C`\ew\*(C'\fR, \f(CW\*(C`:\*(C'\fR or \f(CW\*(C`\*(Aq\*(C'\fR, it must be a file
.IP "\(bu" 4
If the argument matches only \f(CW\*(C`[\ew:\*(Aq]\*(C'\fR, it must be a module
.IP "\(bu" 4
If the argument matches only \f(CW\*(C`\ew\*(C'\fR, it could either be a module or a
file. We will try to find \f(CW\*(C`file\*(C'\fR first in \f(CW@INC\fR and if that fails,
we will try to find \f(CW\*(C`file.pm\*(C'\fR in \f(CW@INC\fR.
If both fail, we die with the respective error messages.
.SH "Caveats"
.IX Header "Caveats"
Because of a bug in perl (#19213), at least in version 5.6.1, we have
to hardcode the path separator for a require on Win32 to be \f(CW\*(C`/\*(C'\fR, like
on Unix rather than the Win32 \f(CW\*(C`\e\*(C'\fR. Otherwise perl will not read its
own \f(CW%INC\fR accurately double load files if they are required again, or
in the worst case, core dump.
.PP
\&\f(CW\*(C`Module::Load\*(C'\fR cannot do implicit imports, only explicit imports.
(in other words, you always have to specify explicitly what you wish
to import from a module, even if the functions are in that modules'
\&\f(CW@EXPORT\fR)
.SH "ACKNOWLEDGEMENTS"
.IX Header "ACKNOWLEDGEMENTS"
Thanks to Jonas B. Nielsen for making explicit imports work.
.SH "BUG REPORTS"
.IX Header "BUG REPORTS"
Please report bugs or other issues to <bug\-module\[e-mail]<gt>.
.SH "AUTHOR"
.IX Header "AUTHOR"
This module by Jos Boumans <[e-mail]>.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
This library is free software; you may redistribute and/or modify it 
under the same terms as Perl itself.