Revision: 297 Author: totti19851101 Date: Mon Aug 24 22:38:03 2009 Log: [No log message] http://code.google.com/p/boost-doc-zh/source/detail?r=297 Modified: /trunk/doc/html/boost_asio/tutorial/tutdaytime4.html =======================================--- /trunk/doc/html/boost_asio/tutorial/tutdaytime4.html Wed May 27 03:09:50 2009 +++ /trunk/doc/html/boost_asio/tutorial/tutdaytime4.html Mon Aug 24 22:38:03 2009
@@ -1,6 +1,6 @@ <html> <head> -<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Daytime.4 - A synchronous UDP daytime client</title> <link rel="stylesheet" href="../../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.74.3"> @@ -24,12 +24,10 @@ </div> <div class="section" lang="en"> <div class="titlepage"><div><div><h3 class="title">-<a name="boost_asio.tutorial.tutdaytime4"></a><a class="link" href="tutdaytime4.html" title="Daytime.4 - A synchronous UDP daytime client"> Daytime.4 - A synchronous
- UDP daytime client</a>+<a name="boost_asio.tutorial.tutdaytime4"></a><a class="link" href="tutdaytime4.html" title="Daytime.4 - A synchronous UDP daytime client"> Daytime.4 - 同步UDP daytime客户端</a>
</h3></div></div></div> <p>- This tutorial program shows how to use asio to implement a client application
- with UDP. + 本例示范如何使用Asio实现一个UDP客户端程序。 </p><pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">array</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
@@ -38,8 +36,7 @@<span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">;</span>
</pre> <p>- The start of the application is essentially the same as for the TCP daytime
- client. + 应用程序的开始部分同TCP daytime客户端在本质上是相同的。 </p><pre class="programlisting"><span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">argv</span><span class="special">[])</span>
<span class="special">{</span> @@ -54,24 +51,20 @@<span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span> <span class="identifier">io_service</span><span class="special">;</span>
</pre> <p>- We use an <a class="link" href="../reference/ip__udp/resolver.html" title="ip::udp::resolver">ip::udp::resolver</a> - object to find the correct remote endpoint to use based on the host and service - names. The query is restricted to return only IPv4 endpoints by the <a class="link" href="../reference/ip__udp/v4.html" title="ip::udp::v4">ip::udp::v4()</a> argument. + 我们使用<a class="link" href="../reference/ip__udp/resolver.html" title="ip::udp::resolver">ip::udp::resolver</a> + 对象来找到正确的基于主机和服务器名称的远程终端。使用<a class="link" href="../reference/ip__udp/v4.html" title="ip::udp::v4">ip::udp::v4()</a>参数来限制query 仅仅返回IPv4的节点。
</p><pre class="programlisting"> <span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span> <span class="identifier">resolver</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span> <span class="identifier">udp</span><span class="special">::</span><span class="identifier">resolver</span><span class="special">::</span><span class="identifier">query</span> <span class="identifier">query</span><span class="special">(</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span class="identifier">argv</span><span class="special">[</span><span class="number">1</span><span class="special">],</span> <span class="string">"daytime"</span><span class="special">);</span>
</pre> <p>- The <a class="link" href="../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::udp::resolver::resolve()</a> - function is guaranteed to return at least one endpoint in the list if it - does not fail. This means it is safe to dereference the return value directly. + 如果函数没有失败,<a class="link" href="../reference/ip__basic_resolver/resolve.html" title="ip::basic_resolver::resolve">ip::udp::resolver::resolve()</a>
+ 保证至少返回列表中一个节点。这意味着直接提领返回值是安全的。 </p><pre class="programlisting"> <span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">receiver_endpoint</span> <span class="special">=</span> <span class="special">*</span><span class="identifier">resolver</span><span class="special">.</span><span class="identifier">resolve</span><span class="special">(</span><span class="identifier">query</span><span class="special">);</span>
</pre> <p>- Since UDP is datagram-oriented, we will not be using a stream socket. Create - an <a class="link" href="../reference/ip__udp/socket.html" title="ip::udp::socket">ip::udp::socket</a>
- and initiate contact with the remote endpoint.+ 由于UDP是基于数据报的,我们并不需要使用一个基于流的socket。创建一个 <a class="link" href="../reference/ip__udp/socket.html" title="ip::udp::socket">ip::udp::socket</a>后即可启动同远程终端的连接。
</p><pre class="programlisting"> <span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">open</span><span class="special">(</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">());</span>
@@ -80,9 +73,7 @@<span class="identifier">socket</span><span class="special">.</span><span class="identifier">send_to</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">send_buf</span><span class="special">),</span> <span class="identifier">receiver_endpoint</span><span class="special">);</span>
</pre> <p>- Now we need to be ready to accept whatever the server sends back to us. The - endpoint on our side that receives the server's response will be initialised - by <a class="link" href="../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">ip::udp::socket::receive_from()</a>. + 现在,我们需要接收服务器发给我们的任何信息。接收服务器响应的客户端 节点将由<a class="link" href="../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">ip::udp::socket::receive_from()</a>启 动。
</p><pre class="programlisting"> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span><span class="special"><</span><span class="keyword">char</span><span class="special">,</span> <span class="number">128</span><span class="special">></span> <span class="identifier">recv_buf</span><span class="special">;</span> <span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">sender_endpoint</span><span class="special">;</span>
@@ -93,7 +84,7 @@ <span class="special">}</span> </pre> <p> - Finally, handle any exceptions that may have been thrown. + 最后,处理可能抛出的任何异常。 </p><pre class="programlisting"> <span class="keyword">catch</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception</span><span class="special">&</span> <span class="identifier">e</span><span class="special">)</span>
<span class="special">{</span> @@ -104,18 +95,16 @@ <span class="special">}</span> </pre> <p>- See the <a class="link" href="tutdaytime4/src.html" title="Source listing for Daytime.4">full source listing</a> + 查看<a class="link" href="tutdaytime4/src.html" title="Source listing for Daytime.4">本例全部源代码</a>
</p> <p>- Return to the <a class="link" href="../tutorial.html" title="Tutorial">tutorial index</a> + 返回<a class="link" href="../tutorial.html" title="Tutorial">指南 </a>
</p> <p>- Previous: <a class="link" href="tutdaytime3.html" title="Daytime.3 - An asynchronous TCP daytime server">Daytime.3 - An
- asynchronous TCP daytime server</a>+ 前一例: <a class="link" href="tutdaytime3.html" title="Daytime.3 - An asynchronous TCP daytime server">Daytime.3 - 异步TCP daytime服务器</a>
</p> <p>- Next: <a class="link" href="tutdaytime5.html" title="Daytime.5 - A synchronous UDP daytime server">Daytime.5 - A synchronous
- UDP daytime server</a>+ 后一例: <a class="link" href="tutdaytime5.html" title="Daytime.5 - A synchronous UDP daytime server">Daytime.5 - 同步UDP daytime服务器</a>
</p> </div><table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision"; width="100%"><tr>