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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>fgetws</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="fgetws"></a> <a name="tag_03_166"></a><!-- fgetws --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_166_01"></a>NAME</h4><blockquote>fgetws - get a wide-character string from a stream</blockquote><h4><a name="tag_03_166_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/stdio.h.html">stdio.h</a>><br> #include <<a href="../basedefs/wchar.h.html">wchar.h</a>><br><br> wchar_t *fgetws(wchar_t *restrict</tt> <i>ws</i><tt>, int</tt> <i>n</i><tt>,<br> FILE *restrict</tt> <i>stream</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_166_03"></a>DESCRIPTION</h4><blockquote><div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between therequirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers tothe ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div><p>The <i>fgetws</i>() function shall read characters from the <i>stream</i>, convert these to the corresponding wide-charactercodes, place them in the <b>wchar_t</b> array pointed to by <i>ws</i>, until <i>n</i>-1 characters are read, or a <newline>is read, converted, and transferred to <i>ws</i>, or an end-of-file condition is encountered. The wide-character string, <i>ws</i>,shall then be terminated with a null wide-character code.</p><p>If an error occurs, the resulting value of the file position indicator for the stream is unspecified.</p><p><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> The<i>fgetws</i>() function may mark the <i>st_atime</i> field of the file associated with <i>stream</i> for update. The<i>st_atime</i> field shall be marked for update by the first successful execution of <a href="../functions/fgetc.html"><i>fgetc</i>()</a>, <a href="../functions/fgets.html"><i>fgets</i>()</a>, <a href="../functions/fgetwc.html"><i>fgetwc</i>()</a>, <i>fgetws</i>(), <a href="../functions/fread.html"><i>fread</i>()</a>, <a href="../functions/fscanf.html"><i>fscanf</i>()</a>, <a href="../functions/getc.html"><i>getc</i>()</a>, <a href="../functions/getchar.html"><i>getchar</i>()</a>, <a href="../functions/gets.html"><i>gets</i>()</a>, or <a href="../functions/scanf.html"><i>scanf</i>()</a> using <i>stream</i> that returns data not supplied by a prior call to <a href="../functions/ungetc.html"><i>ungetc</i>()</a> or <a href="../functions/ungetwc.html"><i>ungetwc</i>()</a>. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><h4><a name="tag_03_166_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>fgetws</i>() shall return <i>ws</i>. If the stream is at end-of-file, the end-of-file indicatorfor the stream shall be set and <i>fgetws</i>() shall return a null pointer. If a read error occurs, the error indicator for thestream shall be set, <i>fgetws</i>() shall return a null pointer, <sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <imgsrc="../images/opt-start.gif" alt="[Option Start]" border="0"> and shall set <i>errno</i> to indicate the error. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><h4><a name="tag_03_166_05"></a>ERRORS</h4><blockquote><p>Refer to <a href="fgetwc.html"><i>fgetwc</i>()</a> .</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_166_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_166_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_166_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_166_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_166_10"></a>SEE ALSO</h4><blockquote><p><a href="fopen.html"><i>fopen</i>()</a> , <a href="fread.html"><i>fread</i>()</a> , the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/stdio.h.html"><i><stdio.h></i></a>, <a href="../basedefs/wchar.h.html"><i><wchar.h></i></a></p></blockquote><h4><a name="tag_03_166_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4. Derived from the MSE working draft.</p></blockquote><h4><a name="tag_03_166_12"></a>Issue 5</h4><blockquote><p>The Optional Header (OH) marking is removed from <a href="../basedefs/stdio.h.html"><i><stdio.h></i></a>.</p></blockquote><h4><a name="tag_03_166_13"></a>Issue 6</h4><blockquote><p>Extensions beyond the ISO C standard are marked.</p><p>The prototype for <i>fgetws</i>() is changed for alignment with the ISO/IEC 9899:1999 standard.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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