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  27. <a name="boost_asio.reference.basic_raw_socket.async_receive.overload1"></a><a class="link" href="overload1.html" title="basic_raw_socket::async_receive (1 of 2 overloads)">basic_raw_socket::async_receive
  28. (1 of 2 overloads)</a>
  29. </h5></div></div></div>
  30. <p>
  31. Start an asynchronous receive on a connected socket.
  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="../../MutableBufferSequence.html" title="Mutable buffer sequence requirements">MutableBufferSequence</a><span class="special">,</span>
  35. <span class="keyword">typename</span> <a class="link" href="../../ReadHandler.html" title="Read handler requirements">ReadHandler</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_receive</span><span class="special">(</span>
  37. <span class="keyword">const</span> <span class="identifier">MutableBufferSequence</span> <span class="special">&amp;</span> <span class="identifier">buffers</span><span class="special">,</span>
  38. <span class="identifier">ReadHandler</span> <span class="identifier">handler</span><span class="special">);</span>
  39. </pre>
  40. <p>
  41. This function is used to asynchronously receive data from the raw socket.
  42. The function call always returns immediately.
  43. </p>
  44. <h6>
  45. <a name="boost_asio.reference.basic_raw_socket.async_receive.overload1.h0"></a>
  46. <span class="phrase"><a name="boost_asio.reference.basic_raw_socket.async_receive.overload1.parameters"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_raw_socket.async_receive.overload1.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 buffers into which the data will be received. Although
  54. the buffers object may be copied as necessary, ownership of the
  55. underlying memory blocks is retained by the caller, which must
  56. guarantee that 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 receive operation completes.
  62. Copies will be made of the handler as required. The function signature
  63. of 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 received.</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_raw_socket.async_receive.overload1.h1"></a>
  81. <span class="phrase"><a name="boost_asio.reference.basic_raw_socket.async_receive.overload1.remarks"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_raw_socket.async_receive.overload1.remarks">Remarks</a>
  82. </h6>
  83. <p>
  84. The async_receive operation can only be used with a connected socket.
  85. Use the async_receive_from function to receive data on an unconnected
  86. raw socket.
  87. </p>
  88. <h6>
  89. <a name="boost_asio.reference.basic_raw_socket.async_receive.overload1.h2"></a>
  90. <span class="phrase"><a name="boost_asio.reference.basic_raw_socket.async_receive.overload1.example"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_raw_socket.async_receive.overload1.example">Example</a>
  91. </h6>
  92. <p>
  93. To receive 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:
  94. </p>
  95. <pre class="programlisting"><span class="identifier">socket</span><span class="special">.</span><span class="identifier">async_receive</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 receiving into multiple buffers in one
  100. go, and 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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