1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>basic_stream_socket::async_receive (1 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_receive.html" title="basic_stream_socket::async_receive"> 9<link rel="prev" href="../async_receive.html" title="basic_stream_socket::async_receive"> 10<link rel="next" href="overload2.html" title="basic_stream_socket::async_receive (2 of 2 overloads)"> 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="../async_receive.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../async_receive.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="overload2.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_receive.overload1"></a><a class="link" href="overload1.html" title="basic_stream_socket::async_receive (1 of 2 overloads)">basic_stream_socket::async_receive 28 (1 of 2 overloads)</a> 29</h5></div></div></div> 30<p> 31 Start an asynchronous receive. 32 </p> 33<pre class="programlisting">template< 34 typename <a class="link" href="../../MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a>, 35 typename <a class="link" href="../../ReadHandler.html" title="Read handler requirements">ReadHandler</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_receive( 37 const MutableBufferSequence & buffers, 38 ReadHandler && handler = <a class="link" href="../../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>); 39</pre> 40<p> 41 This function is used to asynchronously receive data from the stream 42 socket. The function call always returns immediately. 43 </p> 44<h6> 45<a name="boost_asio.reference.basic_stream_socket.async_receive.overload1.h0"></a> 46 <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_receive.overload1.parameters"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_stream_socket.async_receive.overload1.parameters">Parameters</a> 47 </h6> 48<div class="variablelist"> 49<p class="title"><b></b></p> 50<dl class="variablelist"> 51<dt><span class="term">buffers</span></dt> 52<dd><p> 53 One or more buffers into which the data will be received. Although 54 the buffers object may be copied as necessary, ownership of the 55 underlying memory blocks is retained by the caller, which must 56 guarantee that they remain valid until the handler is called. 57 </p></dd> 58<dt><span class="term">handler</span></dt> 59<dd> 60<p> 61 The handler to be called when the receive operation completes. 62 Copies will be made of the handler as required. The function signature 63 of the handler must be: 64</p> 65<pre class="programlisting">void handler( 66 const boost::system::error_code& error, // Result of operation. 67 std::size_t bytes_transferred // Number of bytes received. 68); 69</pre> 70<p> 71 Regardless of whether the asynchronous operation completes immediately 72 or not, the handler will not be invoked from within this function. 73 On immediate completion, invocation of the handler will be performed 74 in a manner equivalent to using <a class="link" href="../../post.html" title="post"><code class="computeroutput">post</code></a>. 75 </p> 76</dd> 77</dl> 78</div> 79<h6> 80<a name="boost_asio.reference.basic_stream_socket.async_receive.overload1.h1"></a> 81 <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_receive.overload1.remarks"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_stream_socket.async_receive.overload1.remarks">Remarks</a> 82 </h6> 83<p> 84 The receive operation may not receive all of the requested number of 85 bytes. Consider using the <a class="link" href="../../async_read.html" title="async_read"><code class="computeroutput">async_read</code></a> 86 function if you need to ensure that the requested amount of data is received 87 before the asynchronous operation completes. 88 </p> 89<h6> 90<a name="boost_asio.reference.basic_stream_socket.async_receive.overload1.h2"></a> 91 <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_receive.overload1.example"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_stream_socket.async_receive.overload1.example">Example</a> 92 </h6> 93<p> 94 To receive into a single data buffer use the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a> 95 function as follows: 96 </p> 97<pre class="programlisting">socket.async_receive(boost::asio::buffer(data, size), handler); 98</pre> 99<p> 100 See the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a> 101 documentation for information on receiving into multiple buffers in one 102 go, and how to use it with arrays, boost::array or std::vector. 103 </p> 104</div> 105<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 106<td align="left"></td> 107<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 108 Kohlhoff<p> 109 Distributed under the Boost Software License, Version 1.0. (See accompanying 110 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>) 111 </p> 112</div></td> 113</tr></table> 114<hr> 115<div class="spirit-nav"> 116<a accesskey="p" href="../async_receive.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../async_receive.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="overload2.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 117</div> 118</body> 119</html> 120
