Adds asio library and Storage Module

2020-12-01 22:41:04 +01:00
1 parent 79a6ee5779
commit 30439acd43
@@ -0,0 +1,120 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Daytime.2 - A synchronous TCP daytime server</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="../tutorial.html" title="Tutorial">
+<link rel="prev" href="tutdaytime1/src.html" title="Source listing for Daytime.1">
+<link rel="next" href="tutdaytime2/src.html" title="Source listing for Daytime.2">
+</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="tutdaytime1/src.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../tutorial.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="tutdaytime2/src.html"><img src="../../next.png" alt="Next"></a>
+</div>
+<div class="section">
+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.tutorial.tutdaytime2"></a><a class="link" href="tutdaytime2.html" title="Daytime.2 - A synchronous TCP daytime server">Daytime.2 - A synchronous
+      TCP daytime server</a>
+</h3></div></div></div>
+<p>
+        This tutorial program shows how to use asio to implement a server application
+        with TCP.
+      </p>
+<pre class="programlisting">#include &lt;ctime&gt;
+#include &lt;iostream&gt;
+#include &lt;string&gt;
+#include &lt;asio.hpp&gt;
+
+using asio::ip::tcp;
+</pre>
+<p>
+        We define the function <code class="computeroutput">make_daytime_string()</code> to create the string
+        to be sent back to the client. This function will be reused in all of our
+        daytime server applications.
+      </p>
+<pre class="programlisting">std::string make_daytime_string()
+{
+  using namespace std; // For time_t, time and ctime;
+  time_t now = time(0);
+  return ctime(&amp;now);
+}
+
+int main()
+{
+  try
+  {
+    asio::io_context io_context;
+</pre>
+<p>
+        A <a class="link" href="../reference/ip__tcp/acceptor.html" title="ip::tcp::acceptor">ip::tcp::acceptor</a>
+        object needs to be created to listen for new connections. It is initialised
+        to listen on TCP port 13, for IP version 4.
+      </p>
+<pre class="programlisting">    tcp::acceptor acceptor(io_context, tcp::endpoint(tcp::v4(), 13));
+</pre>
+<p>
+        This is an iterative server, which means that it will handle one connection
+        at a time. Create a socket that will represent the connection to the client,
+        and then wait for a connection.
+      </p>
+<pre class="programlisting">    for (;;)
+    {
+      tcp::socket socket(io_context);
+      acceptor.accept(socket);
+</pre>
+<p>
+        A client is accessing our service. Determine the current time and transfer
+        this information to the client.
+      </p>
+<pre class="programlisting">      std::string message = make_daytime_string();
+
+      asio::error_code ignored_error;
+      asio::write(socket, asio::buffer(message), ignored_error);
+    }
+  }
+</pre>
+<p>
+        Finally, handle any exceptions.
+      </p>
+<pre class="programlisting">  catch (std::exception&amp; e)
+  {
+    std::cerr &lt;&lt; e.what() &lt;&lt; std::endl;
+  }
+
+  return 0;
+}
+</pre>
+<p>
+        See the <a class="link" href="tutdaytime2/src.html" title="Source listing for Daytime.2">full source listing</a>
+      </p>
+<p>
+        Return to the <a class="link" href="../tutorial.html" title="Tutorial">tutorial index</a>
+      </p>
+<p>
+        Previous: <a class="link" href="tutdaytime1.html" title="Daytime.1 - A synchronous TCP daytime client">Daytime.1 - A synchronous
+        TCP daytime client</a>
+      </p>
+<p>
+        Next: <a class="link" href="tutdaytime3.html" title="Daytime.3 - An asynchronous TCP daytime server">Daytime.3 - An asynchronous
+        TCP daytime server</a>
+      </p>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"></td>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2020 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></td>
+</tr></table>
+<hr>
+<div class="spirit-nav">
+<a accesskey="p" href="tutdaytime1/src.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../tutorial.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="tutdaytime2/src.html"><img src="../../next.png" alt="Next"></a>
+</div>
+</body>
+</html>