1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>basic_raw_socket::async_receive_from (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_from.html" title="basic_raw_socket::async_receive_from"> 9<link rel="prev" href="../async_receive_from.html" title="basic_raw_socket::async_receive_from"> 10<link rel="next" href="overload2.html" title="basic_raw_socket::async_receive_from (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_from.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../async_receive_from.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_raw_socket.async_receive_from.overload1"></a><a class="link" href="overload1.html" title="basic_raw_socket::async_receive_from (1 of 2 overloads)">basic_raw_socket::async_receive_from 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_from( 37 const MutableBufferSequence & buffers, 38 endpoint_type & sender_endpoint, 39 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>); 40</pre> 41<p> 42 This function is used to asynchronously receive raw data. The function 43 call always returns immediately. 44 </p> 45<h6> 46<a name="boost_asio.reference.basic_raw_socket.async_receive_from.overload1.h0"></a> 47 <span class="phrase"><a name="boost_asio.reference.basic_raw_socket.async_receive_from.overload1.parameters"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_raw_socket.async_receive_from.overload1.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 buffers into which the data will be received. Although 55 the buffers object may be copied as necessary, ownership of the 56 underlying memory blocks is retained by the caller, which must 57 guarantee that they remain valid until the handler is called. 58 </p></dd> 59<dt><span class="term">sender_endpoint</span></dt> 60<dd><p> 61 An endpoint object that receives the endpoint of the remote sender 62 of the data. Ownership of the sender_endpoint object is retained 63 by the caller, which must guarantee that it is valid until the 64 handler is called. 65 </p></dd> 66<dt><span class="term">handler</span></dt> 67<dd> 68<p> 69 The handler to be called when the receive operation completes. 70 Copies will be made of the handler as required. The function signature 71 of the handler must be: 72</p> 73<pre class="programlisting">void handler( 74 const boost::system::error_code& error, // Result of operation. 75 std::size_t bytes_transferred // Number of bytes received. 76); 77</pre> 78<p> 79 Regardless of whether the asynchronous operation completes immediately 80 or not, the handler will not be invoked from within this function. 81 On immediate completion, invocation of the handler will be performed 82 in a manner equivalent to using <a class="link" href="../../post.html" title="post"><code class="computeroutput">post</code></a>. 83 </p> 84</dd> 85</dl> 86</div> 87<h6> 88<a name="boost_asio.reference.basic_raw_socket.async_receive_from.overload1.h1"></a> 89 <span class="phrase"><a name="boost_asio.reference.basic_raw_socket.async_receive_from.overload1.example"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_raw_socket.async_receive_from.overload1.example">Example</a> 90 </h6> 91<p> 92 To receive into a single data buffer use the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a> 93 function as follows: 94 </p> 95<pre class="programlisting">socket.async_receive_from( 96 boost::asio::buffer(data, size), 0, sender_endpoint, handler); 97</pre> 98<p> 99 See the <a class="link" href="../../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a> 100 documentation for information on receiving into multiple buffers in one 101 go, and how to use it with arrays, boost::array or std::vector. 102 </p> 103</div> 104<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 105<td align="left"></td> 106<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 107 Kohlhoff<p> 108 Distributed under the Boost Software License, Version 1.0. (See accompanying 109 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>) 110 </p> 111</div></td> 112</tr></table> 113<hr> 114<div class="spirit-nav"> 115<a accesskey="p" href="../async_receive_from.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../async_receive_from.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> 116</div> 117</body> 118</html> 119
