tri11paragon
/
Insane_DNS
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Insane_DNS/libraries/asio-1.28.1/doc/asio/reference/connect/overload2.html

102 lines
8.0 KiB
HTML
Raw Normal View History

can extract domain names
2023-10-24 21:59:30 -04:00
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>connect (2 of 12 overloads)</title>
<link rel="stylesheet" href="../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
<link rel="home" href="../../../index.html" title="Asio">
<link rel="up" href="../connect.html" title="connect">
<link rel="prev" href="overload1.html" title="connect (1 of 12 overloads)">
<link rel="next" href="overload3.html" title="connect (3 of 12 overloads)">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="overload1.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../connect.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="overload3.html"><img src="../../../next.png" alt="Next"></a>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.connect.overload2"></a><a class="link" href="overload2.html" title="connect (2 of 12 overloads)">connect (2 of 12
overloads)</a>
</h4></div></div></div>
<p>
Establishes a socket connection by trying each endpoint in a sequence.
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <a class="link" href="../Protocol.html" title="Protocol requirements">Protocol</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="../Executor1.html" title="Executor requirements">Executor</a><span class="special">,</span>
<span class="keyword">typename</span> <a class="link" href="../EndpointSequence.html" title="Endpoint sequence requirements">EndpointSequence</a><span class="special">&gt;</span>
<span class="identifier">Protocol</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">connect</span><span class="special">(</span>
<span class="identifier">basic_socket</span><span class="special">&lt;</span> <span class="identifier">Protocol</span><span class="special">,</span> <span class="identifier">Executor</span> <span class="special">&gt;</span> <span class="special">&amp;</span> <span class="identifier">s</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">EndpointSequence</span> <span class="special">&amp;</span> <span class="identifier">endpoints</span><span class="special">,</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special">&lt;</span> <span class="identifier">is_endpoint_sequence</span><span class="special">&lt;</span> <span class="identifier">EndpointSequence</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
</pre>
<p>
This function attempts to connect a socket to one of a sequence of endpoints.
It does this by repeated calls to the socket's <code class="computeroutput"><span class="identifier">connect</span></code>
member function, once for each endpoint in the sequence, until a connection
is successfully established.
</p>
<h6>
<a name="asio.reference.connect.overload2.h0"></a>
<span><a name="asio.reference.connect.overload2.parameters"></a></span><a class="link" href="overload2.html#asio.reference.connect.overload2.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">s</span></dt>
<dd><p>
The socket to be connected. If the socket is already open, it will
be closed.
</p></dd>
<dt><span class="term">endpoints</span></dt>
<dd><p>
A sequence of endpoints.
</p></dd>
<dt><span class="term">ec</span></dt>
<dd><p>
Set to indicate what error occurred, if any. If the sequence is empty,
set to <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">not_found</span></code>. Otherwise, contains
the error from the last connection attempt.
</p></dd>
</dl>
</div>
<h6>
<a name="asio.reference.connect.overload2.h1"></a>
<span><a name="asio.reference.connect.overload2.return_value"></a></span><a class="link" href="overload2.html#asio.reference.connect.overload2.return_value">Return
Value</a>
</h6>
<p>
On success, the successfully connected endpoint. Otherwise, a default-constructed
endpoint.
</p>
<h6>
<a name="asio.reference.connect.overload2.h2"></a>
<span><a name="asio.reference.connect.overload2.example"></a></span><a class="link" href="overload2.html#asio.reference.connect.overload2.example">Example</a>
</h6>
<pre class="programlisting"><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span> <span class="identifier">r</span><span class="special">(</span><span class="identifier">my_context</span><span class="special">);</span>
<span class="identifier">tcp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">query</span> <span class="identifier">q</span><span class="special">(</span><span class="string">"host"</span><span class="special">,</span> <span class="string">"service"</span><span class="special">);</span>
<span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">s</span><span class="special">(</span><span class="identifier">my_context</span><span class="special">);</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">;</span>
<span class="identifier">asio</span><span class="special">::</span><span class="identifier">connect</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">r</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">q</span><span class="special">),</span> <span class="identifier">ec</span><span class="special">);</span>
<span class="keyword">if</span> <span class="special">(</span><span class="identifier">ec</span><span class="special">)</span>
<span class="special">{</span>
<span class="comment">// An error occurred.</span>
<span class="special">}</span>
</pre>
</div>
<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="overload1.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../connect.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="overload3.html"><img src="../../../next.png" alt="Next"></a>
</div>
</body>
</html>