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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_asio.reference.read.overload1"></a><a class="link" href="overload1.html" title="read (1 of 8 overloads)">read (1 of 8 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> <a class="link" href="../MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><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="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&</span> <span class="identifier">buffers</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"> |
| The supplied buffers are full. That is, the bytes transferred is equal |
| to the sum of the buffer sizes. |
| </li> |
| <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.overload1.parameters"></a><h6> |
| <a name="boost_asio.reference.read.overload1.parameters-heading"></a> |
| <a class="link" href="overload1.html#boost_asio.reference.read.overload1.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">buffers</span></dt> |
| <dd><p> |
| One or more buffers into which the data will be read. The sum of |
| the buffer sizes indicates the maximum number of bytes to read from |
| the stream. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="boost_asio.reference.read.overload1.return_value"></a><h6> |
| <a name="boost_asio.reference.read.overload1.return_value-heading"></a> |
| <a class="link" href="overload1.html#boost_asio.reference.read.overload1.return_value">Return |
| Value</a> |
| </h6> |
| <p> |
| The number of bytes transferred. |
| </p> |
| <a name="boost_asio.reference.read.overload1.exceptions"></a><h6> |
| <a name="boost_asio.reference.read.overload1.exceptions-heading"></a> |
| <a class="link" href="overload1.html#boost_asio.reference.read.overload1.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.overload1.example"></a><h6> |
| <a name="boost_asio.reference.read.overload1.example-heading"></a> |
| <a class="link" href="overload1.html#boost_asio.reference.read.overload1.example">Example</a> |
| </h6> |
| <p> |
| To read into a single data buffer use the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput"><span class="identifier">buffer</span></code></a> function as follows: |
| </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">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">data</span><span class="special">,</span> <span class="identifier">size</span><span class="special">));</span> |
| </pre> |
| <p> |
| See the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput"><span class="identifier">buffer</span></code></a> |
| documentation for information on reading into multiple buffers in one go, |
| and how to use it with arrays, boost::array or std::vector. |
| </p> |
| <a name="boost_asio.reference.read.overload1.remarks"></a><h6> |
| <a name="boost_asio.reference.read.overload1.remarks-heading"></a> |
| <a class="link" href="overload1.html#boost_asio.reference.read.overload1.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">buffers</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> |
| </div> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2003-2011 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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