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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_asio.reference.read.overload4"></a><a class="link" href="overload4.html" title="read (4 of 6 overloads)">read (4 of 6 overloads)</a> |
| </h4></div></div></div> |
| <p> |
| Attempt to read a certain amount of data from a stream before returning. |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> |
| <span class="keyword">typename</span> <a class="link" href="../SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">></span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">read</span><span class="special">(</span> |
| <span class="identifier">SyncReadStream</span> <span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> |
| <span class="identifier">basic_streambuf</span><span class="special"><</span> <span class="identifier">Allocator</span> <span class="special">></span> <span class="special">&</span> <span class="identifier">b</span><span class="special">);</span> |
| </pre> |
| <p> |
| This function is used to read a certain number of bytes of data from a |
| stream. The call will block until one of the following conditions is true: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> |
| An error occurred. |
| </li></ul></div> |
| <p> |
| This operation is implemented in terms of zero or more calls to the stream's |
| read_some function. |
| </p> |
| <a name="boost_asio.reference.read.overload4.parameters"></a><h6> |
| <a name="id1287868"></a> |
| <a class="link" href="overload4.html#boost_asio.reference.read.overload4.parameters">Parameters</a> |
| </h6> |
| <div class="variablelist"> |
| <p class="title"><b></b></p> |
| <dl> |
| <dt><span class="term">s</span></dt> |
| <dd><p> |
| The stream from which the data is to be read. The type must support |
| the SyncReadStream concept. |
| </p></dd> |
| <dt><span class="term">b</span></dt> |
| <dd><p> |
| The <a class="link" href="../basic_streambuf.html" title="basic_streambuf"><code class="computeroutput"><span class="identifier">basic_streambuf</span></code></a> object into |
| which the data will be read. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="boost_asio.reference.read.overload4.return_value"></a><h6> |
| <a name="id1287940"></a> |
| <a class="link" href="overload4.html#boost_asio.reference.read.overload4.return_value">Return |
| Value</a> |
| </h6> |
| <p> |
| The number of bytes transferred. |
| </p> |
| <a name="boost_asio.reference.read.overload4.exceptions"></a><h6> |
| <a name="id1287966"></a> |
| <a class="link" href="overload4.html#boost_asio.reference.read.overload4.exceptions">Exceptions</a> |
| </h6> |
| <div class="variablelist"> |
| <p class="title"><b></b></p> |
| <dl> |
| <dt><span class="term">boost::system::system_error</span></dt> |
| <dd><p> |
| Thrown on failure. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="boost_asio.reference.read.overload4.remarks"></a><h6> |
| <a name="id1288007"></a> |
| <a class="link" href="overload4.html#boost_asio.reference.read.overload4.remarks">Remarks</a> |
| </h6> |
| <p> |
| This overload is equivalent to calling: |
| </p> |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">read</span><span class="special">(</span> |
| <span class="identifier">s</span><span class="special">,</span> <span class="identifier">b</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">transfer_all</span><span class="special">());</span> |
| </pre> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
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