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  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_asio.reference.windows__basic_random_access_handle.async_write_some_at"></a><a class="link" href="async_write_some_at.html" title="windows::basic_random_access_handle::async_write_some_at">windows::basic_random_access_handle::async_write_some_at</a>
  28 </h4></div></div></div>
  29 <p>
  30           <a class="indexterm" name="boost_asio.indexterm.windows__basic_random_access_handle.async_write_some_at"></a>
  31 Start
  32           an asynchronous write at the specified offset.
  33         </p>
  34 <pre class="programlisting">template&lt;
  35     typename <a class="link" href="../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
  36     typename <a class="link" href="../WriteHandler.html" title="Write handler requirements">WriteHandler</a> = <a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>&gt;
  37 <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_write_some_at(
  38     uint64_t offset,
  39     const ConstBufferSequence &amp; buffers,
  40     WriteHandler &amp;&amp; handler = <a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.default_completion_tokens"><span class="emphasis"><em>DEFAULT</em></span></a>);
  41 </pre>
  42 <p>
  43           This function is used to asynchronously write data to the random-access
  44           handle. The function call always returns immediately.
  45         </p>
  46 <h6>
  47 <a name="boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.h0"></a>
  48           <span class="phrase"><a name="boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.parameters"></a></span><a class="link" href="async_write_some_at.html#boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.parameters">Parameters</a>
  49         </h6>
  50 <div class="variablelist">
  51 <p class="title"><b></b></p>
  52 <dl class="variablelist">
  53 <dt><span class="term">offset</span></dt>
  54 <dd><p>
  55                 The offset at which the data will be written.
  56               </p></dd>
  57 <dt><span class="term">buffers</span></dt>
  58 <dd><p>
  59                 One or more data buffers to be written to the handle. Although the
  60                 buffers object may be copied as necessary, ownership of the underlying
  61                 memory blocks is retained by the caller, which must guarantee that
  62                 they remain valid until the handler is called.
  63               </p></dd>
  64 <dt><span class="term">handler</span></dt>
  65 <dd>
  66 <p>
  67                 The handler to be called when the write operation completes. Copies
  68                 will be made of the handler as required. The function signature of
  69                 the handler must be:
  70 </p>
  71 <pre class="programlisting">void handler(
  72   const boost::system::error_code&amp; error, // Result of operation.
  73   std::size_t bytes_transferred           // Number of bytes written.
  74 );
  75 </pre>
  76 <p>
  77                 Regardless of whether the asynchronous operation completes immediately
  78                 or not, the handler will not be invoked from within this function.
  79                 On immediate completion, invocation of the handler will be performed
  80                 in a manner equivalent to using <a class="link" href="../post.html" title="post"><code class="computeroutput">post</code></a>.
  81               </p>
  82 </dd>
  83 </dl>
  84 </div>
  85 <h6>
  86 <a name="boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.h1"></a>
  87           <span class="phrase"><a name="boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.remarks"></a></span><a class="link" href="async_write_some_at.html#boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.remarks">Remarks</a>
  88         </h6>
  89 <p>
  90           The write operation may not transmit all of the data to the peer. Consider
  91           using the <a class="link" href="../async_write_at.html" title="async_write_at"><code class="computeroutput">async_write_at</code></a>
  92           function if you need to ensure that all data is written before the asynchronous
  93           operation completes.
  94         </p>
  95 <h6>
  96 <a name="boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.h2"></a>
  97           <span class="phrase"><a name="boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.example"></a></span><a class="link" href="async_write_some_at.html#boost_asio.reference.windows__basic_random_access_handle.async_write_some_at.example">Example</a>
  98         </h6>
  99 <p>
 100           To write a single data buffer use the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
 101           function as follows:
 102         </p>
 103 <pre class="programlisting">handle.async_write_some_at(42, boost::asio::buffer(data, size), handler);
 104 </pre>
 105 <p>
 106           See the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
 107           documentation for information on writing multiple buffers in one go, and
 108           how to use it with arrays, boost::array or std::vector.
 109         </p>
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