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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>btowc</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_001_323"> </a>NAME</h4><blockquote>btowc - single-byte to wide-character conversion</blockquote><h4><a name = "tag_000_001_324"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdio.h.html">stdio.h</a>>#include <<a href="wchar.h.html">wchar.h</a>>wint_t btowc(int <i>c</i>);</code></pre></blockquote><h4><a name = "tag_000_001_325"> </a>DESCRIPTION</h4><blockquote>The<i>btowc()</i>function determines whether<i>c</i>constitutes a valid (one-byte) character in the initialshift state.<p>The behaviour of this function is affected by the LC_CTYPE category ofthe current locale.</blockquote><h4><a name = "tag_000_001_326"> </a>RETURN VALUE</h4><blockquote>The<i>btowc()</i>function returns WEOF if<i>c</i>has the value EOF or if <b>(unsigned char)</b><i>c</i>does not constitute a valid (one-byte) character in theinitial shift state. Otherwise, it returns the wide-characterrepresentation of that character.</blockquote><h4><a name = "tag_000_001_327"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_001_328"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_329"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_330"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_331"> </a>SEE ALSO</h4><blockquote><i><a href="wctob.html">wctob()</a></i>,<i><a href="wchar.h.html"><wchar.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the ISO/IEC 9899:1990/Amendment 1:1995 (E).</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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