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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>fwide</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_005_395"> </a>NAME</h4><blockquote>fwide - set stream orientation</blockquote><h4><a name = "tag_000_005_396"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdio.h.html">stdio.h</a>>#include <<a href="wchar.h.html">wchar.h</a>>int fwide(FILE *<i>stream</i>, int <i>mode</i>);</code></pre></blockquote><h4><a name = "tag_000_005_397"> </a>DESCRIPTION</h4><blockquote>The<i>fwide()</i>function determines the orientation of the stream pointed to by <i>stream</i>.If<i>mode</i>is greater than zero, the function first attempts to make the streamwide-orientated. If<i>mode</i>is less than zero, the function first attempts to make the streambyte-orientated. Otherwise,<i>mode</i>is zero and the function does not alter the orientation of the stream.<p>If the orientation of the stream has already been determined, <i>fwide()</i>does not change it.<p>Because no return value is reserved to indicate an error, anapplication wishing to check for error situations should set<i>errno</i>to 0, then call<i>fwide()</i>,then check<i>errno</i>and if it is non-zero, assume an error has occurred.</blockquote><h4><a name = "tag_000_005_398"> </a>RETURN VALUE</h4><blockquote>The<i>fwide()</i>function returns a value greater than zero if, after the call, thestream has wide-orientation, a value less than zero if the stream hasbyte-orientation, or zero if the stream has no orientation.</blockquote><h4><a name = "tag_000_005_399"> </a>ERRORS</h4><blockquote>The<i>fwide()</i>function may fail if:<br><dl compact><dt>[EBADF]<dd>The<i>stream</i>argument is not a valid stream.</dl></blockquote><h4><a name = "tag_000_005_400"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_401"> </a>APPLICATION USAGE</h4><blockquote>A call to<i>fwide()</i>with <i>mode</i>set to zero can be used to determine the current orientation of astream.</blockquote><h4><a name = "tag_000_005_402"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_403"> </a>SEE ALSO</h4><blockquote><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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