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  26. <div class="titlepage"><div><div><h4 class="title">
  27. <a name="boost_asio.reference.basic_stream_socket.async_write_some"></a><a class="link" href="async_write_some.html" title="basic_stream_socket::async_write_some">basic_stream_socket::async_write_some</a>
  28. </h4></div></div></div>
  29. <p>
  30. <a class="indexterm" name="idp152042480"></a>
  31. Start an asynchronous write.
  32. </p>
  33. <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
  34. <span class="keyword">typename</span> <a class="link" href="../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a><span class="special">,</span>
  35. <span class="keyword">typename</span> <a class="link" href="../WriteHandler.html" title="Write handler requirements">WriteHandler</a><span class="special">&gt;</span>
  36. <a class="link" href="../asynchronous_operations.html#boost_asio.reference.asynchronous_operations.return_type_of_an_initiating_function"><span class="emphasis"><em>void-or-deduced</em></span></a> <span class="identifier">async_write_some</span><span class="special">(</span>
  37. <span class="keyword">const</span> <span class="identifier">ConstBufferSequence</span> <span class="special">&amp;</span> <span class="identifier">buffers</span><span class="special">,</span>
  38. <span class="identifier">WriteHandler</span> <span class="identifier">handler</span><span class="special">);</span>
  39. </pre>
  40. <p>
  41. This function is used to asynchronously write data to the stream socket.
  42. The function call always returns immediately.
  43. </p>
  44. <h6>
  45. <a name="boost_asio.reference.basic_stream_socket.async_write_some.h0"></a>
  46. <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_write_some.parameters"></a></span><a class="link" href="async_write_some.html#boost_asio.reference.basic_stream_socket.async_write_some.parameters">Parameters</a>
  47. </h6>
  48. <div class="variablelist">
  49. <p class="title"><b></b></p>
  50. <dl class="variablelist">
  51. <dt><span class="term">buffers</span></dt>
  52. <dd><p>
  53. One or more data buffers to be written to the socket. Although the
  54. buffers object may be copied as necessary, ownership of the underlying
  55. memory blocks is retained by the caller, which must guarantee that
  56. they remain valid until the handler is called.
  57. </p></dd>
  58. <dt><span class="term">handler</span></dt>
  59. <dd>
  60. <p>
  61. The handler to be called when the write operation completes. Copies
  62. will be made of the handler as required. The function signature of
  63. the handler must be:
  64. </p>
  65. <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span>
  66. <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">,</span> <span class="comment">// Result of operation.</span>
  67. <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">bytes_transferred</span> <span class="comment">// Number of bytes written.</span>
  68. <span class="special">);</span>
  69. </pre>
  70. <p>
  71. Regardless of whether the asynchronous operation completes immediately
  72. or not, the handler will not be invoked from within this function.
  73. Invocation of the handler will be performed in a manner equivalent
  74. to using <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span><span class="special">::</span><span class="identifier">post</span><span class="special">()</span></code>.
  75. </p>
  76. </dd>
  77. </dl>
  78. </div>
  79. <h6>
  80. <a name="boost_asio.reference.basic_stream_socket.async_write_some.h1"></a>
  81. <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_write_some.remarks"></a></span><a class="link" href="async_write_some.html#boost_asio.reference.basic_stream_socket.async_write_some.remarks">Remarks</a>
  82. </h6>
  83. <p>
  84. The write operation may not transmit all of the data to the peer. Consider
  85. using the <a class="link" href="../async_write.html" title="async_write"><code class="computeroutput"><span class="identifier">async_write</span></code></a> function if you need
  86. to ensure that all data is written before the asynchronous operation completes.
  87. </p>
  88. <h6>
  89. <a name="boost_asio.reference.basic_stream_socket.async_write_some.h2"></a>
  90. <span class="phrase"><a name="boost_asio.reference.basic_stream_socket.async_write_some.example"></a></span><a class="link" href="async_write_some.html#boost_asio.reference.basic_stream_socket.async_write_some.example">Example</a>
  91. </h6>
  92. <p>
  93. To write 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:
  94. </p>
  95. <pre class="programlisting"><span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_write_some</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> <span class="identifier">handler</span><span class="special">);</span>
  96. </pre>
  97. <p>
  98. See the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput"><span class="identifier">buffer</span></code></a>
  99. documentation for information on writing multiple buffers in one go, and
  100. how to use it with arrays, boost::array or std::vector.
  101. </p>
  102. </div>
  103. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  104. <td align="left"></td>
  105. <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2014 Christopher M. Kohlhoff<p>
  106. Distributed under the Boost Software License, Version 1.0. (See accompanying
  107. 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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