net::nntp.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 "Net::NNTP 3"
.TH Net::NNTP 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.
.if n .ad l
.nh
.SH "NAME"
Net::NNTP \- NNTP Client class
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Net::NNTP;
\&
\&    $nntp = Net::NNTP\->new("some.host.name");
\&    $nntp\->quit;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Net::NNTP\*(C'\fR is a class implementing a simple \s-1NNTP\s0 client in Perl as described
in \s-1RFC977\s0. \f(CW\*(C`Net::NNTP\*(C'\fR inherits its communication methods from \f(CW\*(C`Net::Cmd\*(C'\fR
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.IP "new ( [ \s-1HOST\s0 ] [, \s-1OPTIONS\s0 ])" 4
.IX Item "new ( [ HOST ] [, OPTIONS ])"
This is the constructor for a new Net::NNTP object. \f(CW\*(C`HOST\*(C'\fR is the
name of the remote host to which a \s-1NNTP\s0 connection is required. If not
given then it may be passed as the \f(CW\*(C`Host\*(C'\fR option described below. If no host is passed
then two environment variables are checked, first \f(CW\*(C`NNTPSERVER\*(C'\fR then
\&\f(CW\*(C`NEWSHOST\*(C'\fR, then \f(CW\*(C`Net::Config\*(C'\fR is checked, and if a host is not found
then \f(CW\*(C`news\*(C'\fR is used.
.Sp
\&\f(CW\*(C`OPTIONS\*(C'\fR are passed in a hash like fashion, using key and value pairs.
Possible options are:
.Sp
\&\fBHost\fR \- \s-1NNTP\s0 host to connect to. It may be a single scalar, as defined for
the \f(CW\*(C`PeerAddr\*(C'\fR option in IO::Socket::INET, or a reference to
an array with hosts to try in turn. The \*(L"host\*(R" method will return the value
which was used to connect to the host.
.Sp
\&\fBTimeout\fR \- Maximum time, in seconds, to wait for a response from the
\&\s-1NNTP\s0 server, a value of zero will cause all \s-1IO\s0 operations to block.
(default: 120)
.Sp
\&\fBDebug\fR \- Enable the printing of debugging information to \s-1STDERR\s0
.Sp
\&\fBReader\fR \- If the remote server is \s-1INN\s0 then initially the connection
will be to nnrpd, by default \f(CW\*(C`Net::NNTP\*(C'\fR will issue a \f(CW\*(C`MODE READER\*(C'\fR command
so that the remote server becomes innd. If the \f(CW\*(C`Reader\*(C'\fR option is given
with a value of zero, then this command will not be sent and the
connection will be left talking to nnrpd.
.SH "METHODS"
.IX Header "METHODS"
Unless otherwise stated all methods return either a \fItrue\fR or \fIfalse\fR
value, with \fItrue\fR meaning that the operation was a success. When a method
states that it returns a value, failure will be returned as \fIundef\fR or an
empty list.
.IP "article ( [ MSGID|MSGNUM ], [\s-1FH\s0] )" 4
.IX Item "article ( [ MSGID|MSGNUM ], [FH] )"
Retrieve the header, a blank line, then the body (text) of the
specified article.
.Sp
If \f(CW\*(C`FH\*(C'\fR is specified then it is expected to be a valid filehandle
and the result will be printed to it, on success a true value will be
returned. If \f(CW\*(C`FH\*(C'\fR is not specified then the return value, on success,
will be a reference to an array containing the article requested, each
entry in the array will contain one line of the article.
.Sp
If no arguments are passed then the current article in the currently
selected newsgroup is fetched.
.Sp
\&\f(CW\*(C`MSGNUM\*(C'\fR is a numeric id of an article in the current newsgroup, and
will change the current article pointer.  \f(CW\*(C`MSGID\*(C'\fR is the message id of
an article as shown in that article's header.  It is anticipated that the
client will obtain the \f(CW\*(C`MSGID\*(C'\fR from a list provided by the \f(CW\*(C`newnews\*(C'\fR
command, from references contained within another article, or from the
message-id provided in the response to some other commands.
.Sp
If there is an error then \f(CW\*(C`undef\*(C'\fR will be returned.
.IP "body ( [ MSGID|MSGNUM ], [\s-1FH\s0] )" 4
.IX Item "body ( [ MSGID|MSGNUM ], [FH] )"
Like \f(CW\*(C`article\*(C'\fR but only fetches the body of the article.
.IP "head ( [ MSGID|MSGNUM ], [\s-1FH\s0] )" 4
.IX Item "head ( [ MSGID|MSGNUM ], [FH] )"
Like \f(CW\*(C`article\*(C'\fR but only fetches the headers for the article.
.IP "articlefh ( [ MSGID|MSGNUM ] )" 4
.IX Item "articlefh ( [ MSGID|MSGNUM ] )"
.PD 0
.IP "bodyfh ( [ MSGID|MSGNUM ] )" 4
.IX Item "bodyfh ( [ MSGID|MSGNUM ] )"
.IP "headfh ( [ MSGID|MSGNUM ] )" 4
.IX Item "headfh ( [ MSGID|MSGNUM ] )"
.PD
These are similar to \fIarticle()\fR, \fIbody()\fR and \fIhead()\fR, but rather than
returning the requested data directly, they return a tied filehandle
from which to read the article.
.IP "nntpstat ( [ MSGID|MSGNUM ] )" 4
.IX Item "nntpstat ( [ MSGID|MSGNUM ] )"
The \f(CW\*(C`nntpstat\*(C'\fR command is similar to the \f(CW\*(C`article\*(C'\fR command except that no
text is returned.  When selecting by message number within a group,
the \f(CW\*(C`nntpstat\*(C'\fR command serves to set the \*(L"current article pointer\*(R" without
sending text.
.Sp
Using the \f(CW\*(C`nntpstat\*(C'\fR command to
select by message-id is valid but of questionable value, since a
selection by message-id does \fBnot\fR alter the \*(L"current article pointer\*(R".
.Sp
Returns the message-id of the \*(L"current article\*(R".
.IP "group ( [ \s-1GROUP\s0 ] )" 4
.IX Item "group ( [ GROUP ] )"
Set and/or get the current group. If \f(CW\*(C`GROUP\*(C'\fR is not given then information
is returned on the current group.
.Sp
In a scalar context it returns the group name.
.Sp
In an array context the return value is a list containing, the number
of articles in the group, the number of the first article, the number
of the last article and the group name.
.IP "ihave ( \s-1MSGID\s0 [, \s-1MESSAGE\s0 ])" 4
.IX Item "ihave ( MSGID [, MESSAGE ])"
The \f(CW\*(C`ihave\*(C'\fR command informs the server that the client has an article
whose id is \f(CW\*(C`MSGID\*(C'\fR.  If the server desires a copy of that
article, and \f(CW\*(C`MESSAGE\*(C'\fR has been given the it will be sent.
.Sp
Returns \fItrue\fR if the server desires the article and \f(CW\*(C`MESSAGE\*(C'\fR was
successfully sent,if specified.
.Sp
If \f(CW\*(C`MESSAGE\*(C'\fR is not specified then the message must be sent using the
\&\f(CW\*(C`datasend\*(C'\fR and \f(CW\*(C`dataend\*(C'\fR methods from Net::Cmd
.Sp
\&\f(CW\*(C`MESSAGE\*(C'\fR can be either an array of lines or a reference to an array.