file::listing.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 "File::Listing 3"
.TH File::Listing 3 "2003-10-26" "perl v5.10.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
File::Listing \- parse directory listing
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 6
\& use File::Listing qw(parse_dir);
\& for (parse_dir(\`ls \-l\`)) {
\&     ($name, $type, $size, $mtime, $mode) = @$_;
\&     next if $type ne \*(Aqf\*(Aq; # plain file
\&     #...
\& }
\&
\& # directory listing can also be read from a file
\& open(LISTING, "zcat ls\-lR.gz|");
\& $dir = parse_dir(\e*LISTING, \*(Aq+0000\*(Aq);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module exports a single function called \fIparse_dir()\fR, which can be
used to parse directory listings. Currently it only understand Unix
\&\f(CW\*(Aqls \-l\*(Aq\fR and \f(CW\*(Aqls \-lR\*(Aq\fR format.  It should eventually be able to
most things you might get back from a ftp server file listing (\s-1LIST\s0
command), i.e. \s-1VMS\s0 listings, \s-1NT\s0 listings, \s-1DOS\s0 listings,...
.PP
The first parameter to \fIparse_dir()\fR is the directory listing to parse.
It can be a scalar, a reference to an array of directory lines or a
glob representing a filehandle to read the directory listing from.
.PP
The second parameter is the time zone to use when parsing time stamps
in the listing. If this value is undefined, then the local time zone is
assumed.
.PP
The third parameter is the type of listing to assume.  The values will
be strings like 'unix', 'vms', 'dos'.  Currently only 'unix' is
implemented and this is also the default value.  Ideally, the listing
type should be determined automatically.
.PP
The fourth parameter specifies how unparseable lines should be treated.
Values can be 'ignore', 'warn' or a code reference.  Warn means that
the perl \fIwarn()\fR function will be called.  If a code reference is
passed, then this routine will be called and the return value from it
will be incorporated in the listing.  The default is 'ignore'.
.PP
Only the first parameter is mandatory.
.PP
The return value from \fIparse_dir()\fR is a list of directory entries.  In
a scalar context the return value is a reference to the list.  The
directory entries are represented by an array consisting of [
\&\f(CW$filename\fR, \f(CW$filetype\fR, \f(CW$filesize\fR, \f(CW$filetime\fR, \f(CW$filemode\fR ].  The
\&\f(CW$filetype\fR value is one of the letters 'f', 'd', 'l' or '?'.  The
\&\f(CW$filetime\fR value is the seconds since Jan 1, 1970.  The
\&\f(CW$filemode\fR is a bitmask like the mode returned by \fIstat()\fR.
.SH "CREDITS"
.IX Header "CREDITS"
Based on lsparse.pl (from Lee McLoughlin's ftp mirror package) and
Net::FTP's parse_dir (Graham Barr).