term::ui.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 "Term::UI 3"
.TH Term::UI 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"
Term::UI \- Term::ReadLine UI made easy
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    use Term::UI;
\&    use Term::ReadLine;
\&
\&    my $term = Term::ReadLine\->new(\*(Aqbrand\*(Aq);
\&
\&    my $reply = $term\->get_reply(
\&                    prompt => \*(AqWhat is your favourite colour?\*(Aq,
\&                    choices => [qw|blue red green|],
\&                    default => blue,
\&    );
\&
\&    my $bool = $term\->ask_yn(
\&                        prompt => \*(AqDo you like cookies?\*(Aq,
\&                        default => \*(Aqy\*(Aq,
\&                );
\&
\&
\&    my $string = q[some_command \-option \-\-no\-foo \-\-quux=\*(Aqthis thing\*(Aq];
\&
\&    my ($options,$munged_input) = $term\->parse_options($string);
\&
\&
\&    ### don\*(Aqt have Term::UI issue warnings \-\- default is \*(Aq1\*(Aq
\&    $Term::UI::VERBOSE = 0;
\&
\&    ### always pick the default (good for non\-interactive terms)
\&    ### \-\- default is \*(Aq0\*(Aq
\&    $Term::UI::AUTOREPLY = 1;
\&    
\&    ### Retrieve the entire session as a printable string:
\&    $hist = Term::UI::History\->history_as_string;
\&    $hist = $term\->history_as_string;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Term::UI\*(C'\fR is a transparent way of eliminating the overhead of having
to format a question and then validate the reply, informing the user
if the answer was not proper and re-issuing the question.
.PP
Simply give it the question you want to ask, optionally with choices
the user can pick from and a default and \f(CW\*(C`Term::UI\*(C'\fR will \s-1DWYM\s0.
.PP
For asking a yes or no question, there's even a shortcut.
.SH "HOW IT WORKS"
.IX Header "HOW IT WORKS"
\&\f(CW\*(C`Term::UI\*(C'\fR places itself at the back of the \f(CW\*(C`Term::ReadLine\*(C'\fR 
\&\f(CW@ISA\fR array, so you can call its functions through your term object.
.PP
\&\f(CW\*(C`Term::UI\*(C'\fR uses \f(CW\*(C`Term::UI::History\*(C'\fR to record all interactions
with the commandline. You can retrieve this history, or alter
the filehandle the interaction is printed to. See the 
\&\f(CW\*(C`Term::UI::History\*(C'\fR manpage or the \f(CW\*(C`SYNOPSIS\*(C'\fR for details.
.SH "METHODS"
.IX Header "METHODS"
.ie n .Sh "$reply\fP = \f(CW$term\fP\->get_reply( prompt => 'question?', [choices => \e@list, default => \f(CW$list\fP[0], multi => \s-1BOOL\s0, print_me => ""extra text to print & record"", allow => \f(CW$ref] );"
.el .Sh "\f(CW$reply\fP = \f(CW$term\fP\->get_reply( prompt => 'question?', [choices => \e@list, default => \f(CW$list\fP[0], multi => \s-1BOOL\s0, print_me => ``extra text to print & record'', allow => \f(CW$ref\fP] );"
.IX Subsection "$reply = $term->get_reply( prompt => 'question?', [choices => @list, default => $list[0], multi => BOOL, print_me => extra text to print & record, allow => $ref] );"
\&\f(CW\*(C`get_reply\*(C'\fR asks a user a question, and then returns the reply to the
caller. If the answer is invalid (more on that below), the question will
be reposed, until a satisfactory answer has been entered.
.PP
You have the option of providing a list of choices the user can pick from
using the \f(CW\*(C`choices\*(C'\fR argument. If the answer is not in the list of choices
presented, the question will be reposed.
.PP
If you provide a \f(CW\*(C`default\*(C'\fR  answer, this will be returned when either
\&\f(CW$AUTOREPLY\fR is set to true, (see the \f(CW\*(C`GLOBAL VARIABLES\*(C'\fR section further
below), or when the user just hits \f(CW\*(C`enter\*(C'\fR.
.PP
You can indicate that the user is allowed to enter multiple answers by
toggling the \f(CW\*(C`multi\*(C'\fR flag. Note that a list of answers will then be
returned to you, rather than a simple string.
.PP
By specifying an \f(CW\*(C`allow\*(C'\fR hander, you can yourself validate the answer
a user gives. This can be any of the types that the Params::Check \f(CW\*(C`allow\*(C'\fR 
function allows, so please refer to that manpage for details.
.PP
Finally, you have the option of adding a \f(CW\*(C`print_me\*(C'\fR argument, which is
simply printed before the prompt. It's printed to the same file handle
as the rest of the questions, so you can use this to keep track of a
full session of Q&A with the user, and retrieve it later using the
\&\f(CW\*(C`Term::UI\->history_as_string\*(C'\fR function.
.PP
See the \f(CW\*(C`EXAMPLES\*(C'\fR section for samples of how to use this function.
.ie n .Sh "$bool\fP = \f(CW$term\->ask_yn( prompt => ""your question"", [default => (y|1,n|0), print_me => ""extra text to print & record""] )"
.el .Sh "\f(CW$bool\fP = \f(CW$term\fP\->ask_yn( prompt => ``your question'', [default => (y|1,n|0), print_me => ``extra text to print & record''] )"
.IX Subsection "$bool = $term->ask_yn( prompt => your question, [default => (y|1,n|0), print_me => extra text to print & record] )"
Asks a simple \f(CW\*(C`yes\*(C'\fR or \f(CW\*(C`no\*(C'\fR question to the user, returning a boolean
indicating \f(CW\*(C`true\*(C'\fR or \f(CW\*(C`false\*(C'\fR to the caller.
.PP
The \f(CW\*(C`default\*(C'\fR answer will automatically returned, if the user hits 
\&\f(CW\*(C`enter\*(C'\fR or if \f(CW$AUTOREPLY\fR is set to true. See the \f(CW\*(C`GLOBAL VARIABLES\*(C'\fR
section further below.
.PP
Also, you have the option of adding a \f(CW\*(C`print_me\*(C'\fR argument, which is
simply printed before the prompt. It's printed to the same file handle