1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>basic_stream_socket::async_send (2 of 2 overloads)</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../async_send.html" title="basic_stream_socket::async_send"> 9<link rel="prev" href="overload1.html" title="basic_stream_socket::async_send (1 of 2 overloads)"> 10<link rel="next" href="../async_wait.html" title="basic_stream_socket::async_wait"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="overload1.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../async_send.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../boost_asio.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../async_wait.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="boost_asio.reference.basic_stream_socket.async_send.overload2"></a><a class="link" href="overload2.html" title="basic_stream_socket::async_send (2 of 2 overloads)">basic_stream_socket::async_send 28 (2 of 2 overloads)</a> 29</h5></div></div></div> 30<p> 31 Start an asynchronous send. 32 </p> 33<pre class="programlisting">template< 34 typename <a class="link" href="../../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>, 35 typename <a class="link" href="../../WriteHandler.html" title="Write handler requirements">WriteHandler</a> = <a class="link" href="../../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>> 36<a class="link" href="../../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_send( 37 const ConstBufferSequence & buffers, 38 socket_base::message_flags flags, 39 WriteHandler && handler = <a class="link" href="../../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>); 40</pre> 41<p> 42 This function is used to asynchronously send data on the stream socket. 43 The function call always returns immediately. 44 </p> 45<h6> 46<a name="boost_asio.reference.basic_stream_socket.async_send.overload2.h0"></a> 47 <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_send.overload2.parameters"></a></span><a class="link" href="overload2.html#boost_asio.reference.basic_stream_socket.async_send.overload2.parameters">Parameters</a> 48 </h6> 49<div class="variablelist"> 50<p class="title"><b></b></p> 51<dl class="variablelist"> 52<dt><span class="term">buffers</span></dt> 53<dd><p> 54 One or more data buffers to be sent on the socket. Although the 55 buffers object may be copied as necessary, ownership of the underlying 56 memory blocks is retained by the caller, which must guarantee that 57 they remain valid until the handler is called. 58 </p></dd> 59<dt><span class="term">flags</span></dt> 60<dd><p> 61 Flags specifying how the send call is to be made. 62 </p></dd> 63<dt><span class="term">handler</span></dt> 64<dd> 65<p> 66 The handler to be called when the send operation completes. Copies 67 will be made of the handler as required. The function signature 68 of the handler must be: 69</p> 70<pre class="programlisting">void handler( 71 const boost::system::error_code& error, // Result of operation. 72 std::size_t bytes_transferred // Number of bytes sent. 73); 74</pre> 75<p> 76 Regardless of whether the asynchronous operation completes immediately 77 or not, the handler will not be invoked from within this function. 78 On immediate completion, invocation of the handler will be performed 79 in a manner equivalent to using <a class="link" href="../../post.html" title="post"><code class="computeroutput">post</code></a>. 80 </p> 81</dd> 82</dl> 83</div> 84<h6> 85<a name="boost_asio.reference.basic_stream_socket.async_send.overload2.h1"></a> 86 <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_send.overload2.remarks"></a></span><a class="link" href="overload2.html#boost_asio.reference.basic_stream_socket.async_send.overload2.remarks">Remarks</a> 87 </h6> 88<p> 89 The send operation may not transmit all of the data to the peer. Consider 90 using the <a class="link" href="../../async_write.html" title="async_write"><code class="computeroutput">async_write</code></a> 91 function if you need to ensure that all data is written before the asynchronous 92 operation completes. 93 </p> 94<h6> 95<a name="boost_asio.reference.basic_stream_socket.async_send.overload2.h2"></a> 96 <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_send.overload2.example"></a></span><a class="link" href="overload2.html#boost_asio.reference.basic_stream_socket.async_send.overload2.example">Example</a> 97 </h6> 98<p> 99 To send a single data buffer use the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a> 100 function as follows: 101 </p> 102<pre class="programlisting">socket.async_send(boost::asio::buffer(data, size), 0, handler); 103</pre> 104<p> 105 See the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a> 106 documentation for information on sending multiple buffers in one go, 107 and how to use it with arrays, boost::array or std::vector. 108 </p> 109</div> 110<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 111<td align="left"></td> 112<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 113 Kohlhoff<p> 114 Distributed under the Boost Software License, Version 1.0. (See accompanying 115 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>) 116 </p> 117</div></td> 118</tr></table> 119<hr> 120<div class="spirit-nav"> 121<a accesskey="p" href="overload1.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../async_send.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../boost_asio.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../async_wait.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 122</div> 123</body> 124</html> 125
