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<a name="asio.reference.windows__basic_random_access_handle.read_some_at.overload1"></a><a class="link" href="overload1.html" title="windows::basic_random_access_handle::read_some_at (1 of 2 overloads)">windows::basic_random_access_handle::read_some_at
(1 of 2 overloads)</a>
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<p>
Read some data from the handle at the specified offset.
</p>
<pre class="programlisting"><span class="keyword">template</span><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_some_at</span><span class="special">(</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">offset</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 data from the random-access handle. The
function call will block until one or more bytes of data has been read
successfully, or until an error occurs.
</p>
<a name="asio.reference.windows__basic_random_access_handle.read_some_at.overload1.parameters"></a><h6>
<a name="id1192723"></a>
<a class="link" href="overload1.html#asio.reference.windows__basic_random_access_handle.read_some_at.overload1.parameters">Parameters</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">offset</span></dt>
<dd><p>
The offset at which the data will be read.
</p></dd>
<dt><span class="term">buffers</span></dt>
<dd><p>
One or more buffers into which the data will be read.
</p></dd>
</dl>
</div>
<a name="asio.reference.windows__basic_random_access_handle.read_some_at.overload1.return_value"></a><h6>
<a name="id1192777"></a>
<a class="link" href="overload1.html#asio.reference.windows__basic_random_access_handle.read_some_at.overload1.return_value">Return
Value</a>
</h6>
<p>
The number of bytes read.
</p>
<a name="asio.reference.windows__basic_random_access_handle.read_some_at.overload1.exceptions"></a><h6>
<a name="id1192802"></a>
<a class="link" href="overload1.html#asio.reference.windows__basic_random_access_handle.read_some_at.overload1.exceptions">Exceptions</a>
</h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">asio::system_error</span></dt>
<dd><p>
Thrown on failure. An error code of <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">eof</span></code>
indicates that the connection was closed by the peer.
</p></dd>
</dl>
</div>
<a name="asio.reference.windows__basic_random_access_handle.read_some_at.overload1.remarks"></a><h6>
<a name="id1192872"></a>
<a class="link" href="overload1.html#asio.reference.windows__basic_random_access_handle.read_some_at.overload1.remarks">Remarks</a>
</h6>
<p>
The read_some operation may not read all of the requested number of bytes.
Consider using the <a class="link" href="../../read_at.html" title="read_at"><code class="computeroutput"><span class="identifier">read_at</span></code></a> function if you need
to ensure that the requested amount of data is read before the blocking
operation completes.
</p>
<a name="asio.reference.windows__basic_random_access_handle.read_some_at.overload1.example"></a><h6>
<a name="id1192913"></a>
<a class="link" href="overload1.html#asio.reference.windows__basic_random_access_handle.read_some_at.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">handle</span><span class="special">.</span><span class="identifier">read_some_at</span><span class="special">(</span><span class="number">42</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>
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<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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