1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>read (13 of 16 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="../read.html" title="read"> 9<link rel="prev" href="overload12.html" title="read (12 of 16 overloads)"> 10<link rel="next" href="overload14.html" title="read (14 of 16 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="overload12.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../read.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="overload14.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 27<a name="boost_asio.reference.read.overload13"></a><a class="link" href="overload13.html" title="read (13 of 16 overloads)">read (13 of 16 28 overloads)</a> 29</h4></div></div></div> 30<p> 31 Attempt to read a certain amount of data from a stream before returning. 32 </p> 33<pre class="programlisting">template< 34 typename <a class="link" href="../SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a>, 35 typename <a class="link" href="../DynamicBuffer_v2.html" title="Dynamic buffer requirements (version 2)">DynamicBuffer_v2</a>> 36std::size_t read( 37 SyncReadStream & s, 38 DynamicBuffer_v2 buffers, 39 typename enable_if< is_dynamic_buffer_v2< DynamicBuffer_v2 >::value >::type * = 0); 40</pre> 41<p> 42 This function is used to read a certain number of bytes of data from a 43 stream. The call will block until one of the following conditions is true: 44 </p> 45<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 46<li class="listitem"> 47 The specified dynamic buffer sequence is full (that is, it has reached 48 maximum size). 49 </li> 50<li class="listitem"> 51 An error occurred. 52 </li> 53</ul></div> 54<p> 55 This operation is implemented in terms of zero or more calls to the stream's 56 read_some function. 57 </p> 58<h6> 59<a name="boost_asio.reference.read.overload13.h0"></a> 60 <span class="phrase"><a name="boost_asio.reference.read.overload13.parameters"></a></span><a class="link" href="overload13.html#boost_asio.reference.read.overload13.parameters">Parameters</a> 61 </h6> 62<div class="variablelist"> 63<p class="title"><b></b></p> 64<dl class="variablelist"> 65<dt><span class="term">s</span></dt> 66<dd><p> 67 The stream from which the data is to be read. The type must support 68 the SyncReadStream concept. 69 </p></dd> 70<dt><span class="term">buffers</span></dt> 71<dd><p> 72 The dynamic buffer sequence into which the data will be read. 73 </p></dd> 74</dl> 75</div> 76<h6> 77<a name="boost_asio.reference.read.overload13.h1"></a> 78 <span class="phrase"><a name="boost_asio.reference.read.overload13.return_value"></a></span><a class="link" href="overload13.html#boost_asio.reference.read.overload13.return_value">Return 79 Value</a> 80 </h6> 81<p> 82 The number of bytes transferred. 83 </p> 84<h6> 85<a name="boost_asio.reference.read.overload13.h2"></a> 86 <span class="phrase"><a name="boost_asio.reference.read.overload13.exceptions"></a></span><a class="link" href="overload13.html#boost_asio.reference.read.overload13.exceptions">Exceptions</a> 87 </h6> 88<div class="variablelist"> 89<p class="title"><b></b></p> 90<dl class="variablelist"> 91<dt><span class="term">boost::system::system_error</span></dt> 92<dd><p> 93 Thrown on failure. 94 </p></dd> 95</dl> 96</div> 97<h6> 98<a name="boost_asio.reference.read.overload13.h3"></a> 99 <span class="phrase"><a name="boost_asio.reference.read.overload13.remarks"></a></span><a class="link" href="overload13.html#boost_asio.reference.read.overload13.remarks">Remarks</a> 100 </h6> 101<p> 102 This overload is equivalent to calling: 103 </p> 104<pre class="programlisting">boost::asio::read( 105 s, buffers, 106 boost::asio::transfer_all()); 107</pre> 108</div> 109<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 110<td align="left"></td> 111<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 112 Kohlhoff<p> 113 Distributed under the Boost Software License, Version 1.0. (See accompanying 114 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>) 115 </p> 116</div></td> 117</tr></table> 118<hr> 119<div class="spirit-nav"> 120<a accesskey="p" href="overload12.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../read.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="overload14.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 121</div> 122</body> 123</html> 124
