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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><wchar.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="<wchar.h>"></a> <a name="tag_13_83"></a><!-- <wchar.h> --> <!--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_13_83_01"></a>NAME</h4><blockquote>wchar.h - wide-character handling</blockquote><h4><a name="tag_13_83_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><tt>#include <wchar.h></tt></p></blockquote><h4><a name="tag_13_83_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"> Some of the functionality described on this reference page extends the ISO C standard. Applications shall definethe appropriate feature test macro (see the System Interfaces volume of IEEE Std 1003.1-2001, <a href="../functions/xsh_chap02_02.html">Section 2.2, The Compilation Environment</a>) to enable the visibility of these symbols in thisheader. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div><p>The <i><wchar.h></i> header shall define the following types:</p><dl compact><dt><b>wchar_t</b></dt><dd>As described in <a href="stddef.h.html"><i><stddef.h></i></a> .</dd><dt><b>wint_t</b></dt><dd>An integer type capable of storing any valid value of <b>wchar_t</b> or WEOF.</dd><dt><b>wctype_t</b></dt><dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">A scalar type of a data object that can hold values which represent locale-specific character classification. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd><dt><b>mbstate_t</b></dt><dd>An object type other than an array type that can hold the conversion state information necessary to convert between sequencesof (possibly multi-byte) characters and wide characters. <sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> If a codeset is being used such that an <b>mbstate_t</b> needs topreserve more than 2 levels of reserved state, the results are unspecified. <img src="../images/opt-end.gif" alt="[Option End]"border="0"></dd><dt><b>FILE</b></dt><dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">As described in <a href="stdio.h.html"><i><stdio.h></i></a> . <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd><dt><b>size_t</b></dt><dd>As described in <a href="stddef.h.html"><i><stddef.h></i></a> .</dd><dt><b>va_list</b></dt><dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">As described in <a href="stdarg.h.html"><i><stdarg.h></i></a> . <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd></dl><p>The implementation shall support one or more programming environments in which the width of <b>wint_t</b> is no greater than thewidth of type <b>long</b>. The names of these programming environments can be obtained using the <a href="../functions/confstr.html"><i>confstr</i>()</a> function or the <a href="../utilities/getconf.html"><i>getconf</i></a>utility.</p><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt>wint_t btowc(int);wint_t fgetwc(FILE *);wchar_t *fgetws(wchar_t *restrict, int, FILE *restrict);wint_t fputwc(wchar_t, FILE *);int fputws(const wchar_t *restrict, FILE *restrict);int fwide(FILE *, int);int fwprintf(FILE *restrict, const wchar_t *restrict, ...);int fwscanf(FILE *restrict, const wchar_t *restrict, ...);wint_t getwc(FILE *);wint_t getwchar(void);<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">int iswalnum(wint_t);int iswalpha(wint_t);int iswcntrl(wint_t);int iswctype(wint_t, wctype_t);int iswdigit(wint_t);int iswgraph(wint_t);int iswlower(wint_t);int iswprint(wint_t);int iswpunct(wint_t);int iswspace(wint_t);int iswupper(wint_t);int iswxdigit(wint_t);<img src="../images/opt-end.gif" alt="[Option End]" border="0">size_t mbrlen(const char *restrict, size_t, mbstate_t *restrict);size_t mbrtowc(wchar_t *restrict, const char *restrict, size_t, mbstate_t *restrict);int mbsinit(const mbstate_t *);size_t mbsrtowcs(wchar_t *restrict, const char **restrict, size_t, mbstate_t *restrict);wint_t putwc(wchar_t, FILE *);wint_t putwchar(wchar_t);int swprintf(wchar_t *restrict, size_t, const wchar_t *restrict, ...);int swscanf(const wchar_t *restrict, const wchar_t *restrict, ...);<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">wint_t towlower(wint_t);wint_t towupper(wint_t);<img src="../images/opt-end.gif" alt="[Option End]" border="0">wint_t ungetwc(wint_t, FILE *);int vfwprintf(FILE *restrict, const wchar_t *restrict, va_list);int vfwscanf(FILE *restrict, const wchar_t *restrict, va_list);int vwprintf(const wchar_t *restrict, va_list);int vswprintf(wchar_t *restrict, size_t, const wchar_t *restrict, va_list);int vswscanf(const wchar_t *restrict, const wchar_t *restrict, va_list);int vwscanf(const wchar_t *restrict, va_list);size_t wcrtomb(char *restrict, wchar_t, mbstate_t *restrict);wchar_t *wcscat(wchar_t *restrict, const wchar_t *restrict);wchar_t *wcschr(const wchar_t *, wchar_t);int wcscmp(const wchar_t *, const wchar_t *);int wcscoll(const wchar_t *, const wchar_t *);wchar_t *wcscpy(wchar_t *restrict, const wchar_t *restrict);size_t wcscspn(const wchar_t *, const wchar_t *);size_t wcsftime(wchar_t *restrict, size_t, const wchar_t *restrict, const struct tm *restrict);size_t wcslen(const wchar_t *);wchar_t *wcsncat(wchar_t *restrict, const wchar_t *restrict, size_t);int wcsncmp(const wchar_t *, const wchar_t *, size_t);wchar_t *wcsncpy(wchar_t *restrict, const wchar_t *restrict, size_t);wchar_t *wcspbrk(const wchar_t *, const wchar_t *);wchar_t *wcsrchr(const wchar_t *, wchar_t);size_t wcsrtombs(char *restrict, const wchar_t **restrict, size_t, mbstate_t *restrict);size_t wcsspn(const wchar_t *, const wchar_t *);wchar_t *wcsstr(const wchar_t *restrict, const wchar_t *restrict);double wcstod(const wchar_t *restrict, wchar_t **restrict);float wcstof(const wchar_t *restrict, wchar_t **restrict);wchar_t *wcstok(wchar_t *restrict, const wchar_t *restrict, wchar_t **restrict);long wcstol(const wchar_t *restrict, wchar_t **restrict, int);long double wcstold(const wchar_t *restrict, wchar_t **restrict);long long wcstoll(const wchar_t *restrict, wchar_t **restrict, int);unsigned long wcstoul(const wchar_t *restrict, wchar_t **restrict, int);unsigned long long wcstoull(const wchar_t *restrict, wchar_t **restrict, int);<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">wchar_t *wcswcs(const wchar_t *, const wchar_t *);int wcswidth(const wchar_t *, size_t);<img src="../images/opt-end.gif" alt="[Option End]" border="0">size_t wcsxfrm(wchar_t *restrict, const wchar_t *restrict, size_t);int wctob(wint_t);<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">wctype_t wctype(const char *);int wcwidth(wchar_t);<img src="../images/opt-end.gif" alt="[Option End]" border="0">wchar_t *wmemchr(const wchar_t *, wchar_t, size_t);⌨️ 快捷键说明
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