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<title>Stream-Oriented HANDLEs</title>
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<div class="titlepage"><div><div><h4 class="title">
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<a name="boost_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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Boost.Asio contains classes to allow asynchronous read and write operations
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to be performed on Windows <code class="computeroutput">HANDLE</code>s, such as named pipes.
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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">HANDLE handle = ::CreateFile(...);
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windows::stream_handle pipe(my_io_context, handle);
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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>, <a class="link" href="../../reference/async_write.html" title="async_write">async_write()</a>,
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<a class="link" href="../../reference/read_until.html" title="read_until">read_until()</a> or
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<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">HANDLE</code> must support use
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with I/O completion ports (which means that named pipes are supported,
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but anonymous pipes and console streams are not).
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</p>
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<h6>
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<a name="boost_asio.overview.windows.stream_handle.h0"></a>
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<span class="phrase"><a name="boost_asio.overview.windows.stream_handle.see_also"></a></span><a class="link" href="stream_handle.html#boost_asio.overview.windows.stream_handle.see_also">See 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="boost_asio.overview.windows.stream_handle.h1"></a>
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<span class="phrase"><a name="boost_asio.overview.windows.stream_handle.notes"></a></span><a class="link" href="stream_handle.html#boost_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">HANDLE</code>s are only available at compile time
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when targeting Windows and only when the I/O completion port backend is
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used (which is the default). A program may test for the macro <code class="computeroutput">BOOST_ASIO_HAS_WINDOWS_STREAM_HANDLE</code>
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to determine whether they are supported.
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</p>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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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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