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| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="boost_asio.reference.read_until.overload3"></a><a class="link" href="overload3.html" title="read_until (3 of 8 overloads)">read_until |
| (3 of 8 overloads)</a> |
| </h4></div></div></div> |
| <p> |
| Read data into a streambuf until it contains a specified delimiter. |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> |
| <span class="keyword">typename</span> <a class="link" href="../SyncReadStream.html" title="Buffer-oriented synchronous read stream requirements">SyncReadStream</a><span class="special">,</span> |
| <span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">></span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">read_until</span><span class="special">(</span> |
| <span class="identifier">SyncReadStream</span> <span class="special">&</span> <span class="identifier">s</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">basic_streambuf</span><span class="special"><</span> <span class="identifier">Allocator</span> <span class="special">></span> <span class="special">&</span> <span class="identifier">b</span><span class="special">,</span> |
| <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="special">&</span> <span class="identifier">delim</span><span class="special">);</span> |
| </pre> |
| <p> |
| This function is used to read data into the specified streambuf until the |
| streambuf's get area contains the specified delimiter. The call will block |
| until one of the following conditions is true: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| The get area of the streambuf contains the specified delimiter. |
| </li> |
| <li class="listitem"> |
| An error occurred. |
| </li> |
| </ul></div> |
| <p> |
| This operation is implemented in terms of zero or more calls to the stream's |
| read_some function. If the streambuf's get area already contains the delimiter, |
| the function returns immediately. |
| </p> |
| <a name="boost_asio.reference.read_until.overload3.parameters"></a><h6> |
| <a name="id1297344"></a> |
| <a class="link" href="overload3.html#boost_asio.reference.read_until.overload3.parameters">Parameters</a> |
| </h6> |
| <div class="variablelist"> |
| <p class="title"><b></b></p> |
| <dl> |
| <dt><span class="term">s</span></dt> |
| <dd><p> |
| The stream from which the data is to be read. The type must support |
| the SyncReadStream concept. |
| </p></dd> |
| <dt><span class="term">b</span></dt> |
| <dd><p> |
| A streambuf object into which the data will be read. |
| </p></dd> |
| <dt><span class="term">delim</span></dt> |
| <dd><p> |
| The delimiter string. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="boost_asio.reference.read_until.overload3.return_value"></a><h6> |
| <a name="id1297416"></a> |
| <a class="link" href="overload3.html#boost_asio.reference.read_until.overload3.return_value">Return |
| Value</a> |
| </h6> |
| <p> |
| The number of bytes in the streambuf's get area up to and including the |
| delimiter. |
| </p> |
| <a name="boost_asio.reference.read_until.overload3.exceptions"></a><h6> |
| <a name="id1297443"></a> |
| <a class="link" href="overload3.html#boost_asio.reference.read_until.overload3.exceptions">Exceptions</a> |
| </h6> |
| <div class="variablelist"> |
| <p class="title"><b></b></p> |
| <dl> |
| <dt><span class="term">boost::system::system_error</span></dt> |
| <dd><p> |
| Thrown on failure. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="boost_asio.reference.read_until.overload3.remarks"></a><h6> |
| <a name="id1297485"></a> |
| <a class="link" href="overload3.html#boost_asio.reference.read_until.overload3.remarks">Remarks</a> |
| </h6> |
| <p> |
| After a successful read_until operation, the streambuf may contain additional |
| data beyond the delimiter. An application will typically leave that data |
| in the streambuf for a subsequent read_until operation to examine. |
| </p> |
| <a name="boost_asio.reference.read_until.overload3.example"></a><h6> |
| <a name="id1297514"></a> |
| <a class="link" href="overload3.html#boost_asio.reference.read_until.overload3.example">Example</a> |
| </h6> |
| <p> |
| To read data into a streambuf until a newline is encountered: |
| </p> |
| <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">streambuf</span> <span class="identifier">b</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">read_until</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">b</span><span class="special">,</span> <span class="string">"\r\n"</span><span class="special">);</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span> <span class="identifier">is</span><span class="special">(&</span><span class="identifier">b</span><span class="special">);</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">line</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">getline</span><span class="special">(</span><span class="identifier">is</span><span class="special">,</span> <span class="identifier">line</span><span class="special">);</span> |
| </pre> |
| <p> |
| After the <code class="computeroutput"><span class="identifier">read_until</span></code> operation |
| completes successfully, the buffer <code class="computeroutput"><span class="identifier">b</span></code> |
| contains the delimiter: |
| </p> |
| <pre class="programlisting"><span class="special">{</span> <span class="char">'a'</span><span class="special">,</span> <span class="char">'b'</span><span class="special">,</span> <span class="special">...,</span> <span class="char">'c'</span><span class="special">,</span> <span class="char">'\r'</span><span class="special">,</span> <span class="char">'\n'</span><span class="special">,</span> <span class="char">'d'</span><span class="special">,</span> <span class="char">'e'</span><span class="special">,</span> <span class="special">...</span> <span class="special">}</span> |
| </pre> |
| <p> |
| The call to <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">getline</span></code> then extracts the data up to |
| and including the delimiter, so that the string <code class="computeroutput"><span class="identifier">line</span></code> |
| contains: |
| </p> |
| <pre class="programlisting"><span class="special">{</span> <span class="char">'a'</span><span class="special">,</span> <span class="char">'b'</span><span class="special">,</span> <span class="special">...,</span> <span class="char">'c'</span><span class="special">,</span> <span class="char">'\r'</span><span class="special">,</span> <span class="char">'\n'</span> <span class="special">}</span> |
| </pre> |
| <p> |
| The remaining data is left in the buffer <code class="computeroutput"><span class="identifier">b</span></code> |
| as follows: |
| </p> |
| <pre class="programlisting"><span class="special">{</span> <span class="char">'d'</span><span class="special">,</span> <span class="char">'e'</span><span class="special">,</span> <span class="special">...</span> <span class="special">}</span> |
| </pre> |
| <p> |
| This data may be the start of a new line, to be extracted by a subsequent |
| <code class="computeroutput"><span class="identifier">read_until</span></code> operation. |
| </p> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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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