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识别语音的C代码! 还有教程说明.大家自己看看吧!

<p>Deriving from <code>boost::iostreams::stream</code> gives us all the <code>ostream</code> functionality. This stream objects needs to be initialized with a sink object instance. Thus, we also derive from <code>SinkType</code> (the template parameter) and initialize the <code>boost::iostreams::stream</code> with <code>*<span class="code-keyword">this</span></code>. Another advantage of deriving from <code>SinkType</code> is that it allows us direct access to the sink object. Direct access allows us, for example, to access the <code>SetRate()</code> method directly, to change the speech speed.</p>

<h2>Speaking the Text</h2>

<p>The <code>boost::iostreams</code> machinery will take care of all the type conversions and <code>ostream</code> syntax. Eventually, <code>audio_sink::write</code> will be called. Although we provided both narrow and wide character string <code>ostream</code>s, SAPI supports only wide character strings. Also, the Sink's <code>write()</code> methods accept <em>non</em>-null-terminated strings and the number of characters to use from the stream.</p>

<p>To address these two issues, we'll convert the continuous stream + size to a null-terminated (w)string using the appropriate <code>std::(w)<span class="code-SDKkeyword">string</span></code> constructor.</p>

<p>To speak the narrow character string, we call the wide <code>write</code> version with STLSoft's <code>winstl::a2w()</code> to easily convert from narrow to wide. <code>winstl::a2w()</code> will take care of any required allocations and deallocation of temporary buffers, and of the conversion itself.</p>

<h2>Possible Extensions</h2>

<p>Having achieved my the design goals, some possible extensions come to mind.</p>

<p>It might be interesting to extend the <code>ostream</code> support even further by using locales for language selection. Wrapping some of the XML tags as <code>ostream</code>
manipulators, will give a more natural (or, at least, familiar) syntax.
Of course, similar extensions can convert the SAPI Speech Recognition
Interfaces into an <code>istream</code>, but that's a completely different ball game.</p>

<p>It might also be desirable to support synchronous (blocking) speech.</p>

<h2>Revision History</h2>
<ul>
  <li><strong>March 30, 2007</strong> Fixed code to compile and run on MSVS 2005, by using <code><span class="code-keyword">wchar_t</span></code> instead of <code><span class="code-keyword">unsigned</span> <span class="code-keyword">short</span></code>. <br>
    Thanks to Jochen Berteld for pointing out the problem and to Matthew Wilson for pointing out the solution.
  </li>
</ul>



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