79 lines
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79 lines
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Stream-Oriented HANDLEs</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../asio.png"></td></tr></table>
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<a accesskey="p" href="../windows.html"><img src="../../../prev.png" alt="Prev"></a><a accesskey="u" href="../windows.html"><img src="../../../up.png" alt="Up"></a><a accesskey="h" href="../../../index.html"><img src="../../../home.png" alt="Home"></a><a accesskey="n" href="random_access_handle.html"><img src="../../../next.png" alt="Next"></a>
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<div class="section">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="asio.overview.windows.stream_handle"></a><a class="link" href="stream_handle.html" title="Stream-Oriented HANDLEs">Stream-Oriented
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HANDLEs</a>
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</h4></div></div></div>
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<p>
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Asio contains classes to allow asynchronous read and write operations to
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be performed on Windows <code class="computeroutput"><span class="identifier">HANDLE</span></code>s,
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such as named pipes.
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</p>
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<p>
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For example, to perform asynchronous operations on a named pipe, the following
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object may be created:
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</p>
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<pre class="programlisting"><span class="identifier">HANDLE</span> <span class="identifier">handle</span> <span class="special">=</span> <span class="special">::</span><span class="identifier">CreateFile</span><span class="special">(...);</span>
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<span class="identifier">windows</span><span class="special">::</span><span class="identifier">stream_handle</span> <span class="identifier">pipe</span><span class="special">(</span><span class="identifier">my_io_context</span><span class="special">,</span> <span class="identifier">handle</span><span class="special">);</span>
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</pre>
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<p>
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These are then used as synchronous or asynchronous read and write streams.
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This means the objects can be used with any of the <a class="link" href="../../reference/read.html" title="read">read()</a>,
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<a class="link" href="../../reference/async_read.html" title="async_read">async_read()</a>, <a class="link" href="../../reference/write.html" title="write">write()</a>,
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<a class="link" href="../../reference/async_write.html" title="async_write">async_write()</a>, <a class="link" href="../../reference/read_until.html" title="read_until">read_until()</a> or <a class="link" href="../../reference/async_read_until.html" title="async_read_until">async_read_until()</a>
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free functions.
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</p>
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<p>
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The kernel object referred to by the <code class="computeroutput"><span class="identifier">HANDLE</span></code>
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must support use with I/O completion ports (which means that named pipes
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are supported, but anonymous pipes and console streams are not).
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</p>
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<h6>
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<a name="asio.overview.windows.stream_handle.h0"></a>
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<span><a name="asio.overview.windows.stream_handle.see_also"></a></span><a class="link" href="stream_handle.html#asio.overview.windows.stream_handle.see_also">See
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Also</a>
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</h6>
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<p>
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<a class="link" href="../../reference/windows__stream_handle.html" title="windows::stream_handle">windows::stream_handle</a>.
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</p>
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<h6>
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<a name="asio.overview.windows.stream_handle.h1"></a>
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<span><a name="asio.overview.windows.stream_handle.notes"></a></span><a class="link" href="stream_handle.html#asio.overview.windows.stream_handle.notes">Notes</a>
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</h6>
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<p>
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Windows stream <code class="computeroutput"><span class="identifier">HANDLE</span></code>s
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are only available at compile time when targeting Windows and only when
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the I/O completion port backend is used (which is the default). A program
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may test for the macro <code class="computeroutput"><span class="identifier">ASIO_HAS_WINDOWS_STREAM_HANDLE</span></code>
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to determine whether they are supported.
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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