src.html
4.57 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Source listing for Daytime.6</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="../tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">
<link rel="prev" href="../tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">
<link rel="next" href="../tutdaytime7.html" title="Daytime.7 - A combined TCP/UDP asynchronous server">
</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="../tutdaytime6.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../tutdaytime6.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="../tutdaytime7.html"><img src="../../../next.png" alt="Next"></a>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="asio.tutorial.tutdaytime6.src"></a><a class="link" href="src.html" title="Source listing for Daytime.6">Source listing for Daytime.6</a>
</h4></div></div></div>
<pre class="programlisting">//
// server.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <ctime>
#include <iostream>
#include <string>
#include <boost/array.hpp>
#include <boost/bind/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <asio.hpp>
using asio::ip::udp;
std::string make_daytime_string()
{
using namespace std; // For time_t, time and ctime;
time_t now = time(0);
return ctime(&now);
}
class udp_server
{
public:
udp_server(asio::io_context& io_context)
: socket_(io_context, udp::endpoint(udp::v4(), 13))
{
start_receive();
}
private:
void start_receive()
{
socket_.async_receive_from(
asio::buffer(recv_buffer_), remote_endpoint_,
boost::bind(&udp_server::handle_receive, this,
asio::placeholders::error,
asio::placeholders::bytes_transferred));
}
void handle_receive(const asio::error_code& error,
std::size_t /*bytes_transferred*/)
{
if (!error)
{
boost::shared_ptr<std::string> message(
new std::string(make_daytime_string()));
socket_.async_send_to(asio::buffer(*message), remote_endpoint_,
boost::bind(&udp_server::handle_send, this, message,
asio::placeholders::error,
asio::placeholders::bytes_transferred));
start_receive();
}
}
void handle_send(boost::shared_ptr<std::string> /*message*/,
const asio::error_code& /*error*/,
std::size_t /*bytes_transferred*/)
{
}
udp::socket socket_;
udp::endpoint remote_endpoint_;
boost::array<char, 1> recv_buffer_;
};
int main()
{
try
{
asio::io_context io_context;
udp_server server(io_context);
io_context.run();
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
return 0;
}
</pre>
<p>
Return to <a class="link" href="../tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">Daytime.6 - An asynchronous
UDP 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="../tutdaytime6.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../tutdaytime6.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="../tutdaytime7.html"><img src="../../../next.png" alt="Next"></a>
</div>
</body>
</html>