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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><wchar.h></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_010_458"> </a>NAME</h4><blockquote>wchar.h - wide-character types</blockquote><h4><a name = "tag_000_010_459"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <wchar.h></code></pre></blockquote><h4><a name = "tag_000_010_460"> </a>DESCRIPTION</h4><blockquote>The<i><wchar.h></i>header defines the following data types through<dl compact><dt><b>wchar_t</b><dd>As described in<i><a href="stddef.h.html"><stddef.h></a></i>.<dt><b>wint_t</b><dd><index term="data type, wint_t"></index>An integral type capable of storing any validvalue of<b>wchar_t</b>,or<b>WEOF</b>.<dt><b>wctype_t</b><dd><index term="data type, wctype_t"></index>A scalar type of a data object that can hold values which representlocale-specific character classification.<dt><b>mbstate_t</b><dd><index term="data type, mbstate_t"></index>An object type other than an array type that can hold the conversionstate information necessary to convert between sequences of (possiblymultibyte) characters and wide-characters.If a codeset is being used such that an<b>mbstate_t</b>needs to preserve more than 2 levels of reserved state, the resultsare unspecified.<dt><b>FILE</b><dd>As described in<i><a href="stdio.h.html"><stdio.h></a></i>.<dt><b>size_t</b><dd>As described in<i><a href="stddef.h.html"><stddef.h></a></i>.</dl><p>The<i><wchar.h></i>headerdeclares the following as functions and may also define them as macros.Function prototypes must be provided for use with an ISO Ccompiler.<pre><code>wint_t <a href="btowc.html">btowc</a>(int);int <a href="fwprintf.html">fwprintf</a>(FILE *, const wchar_t *, ...);int <a href="fwscanf.html">fwscanf</a>(FILE *, const wchar_t *, ...);int <a href="iswalnum.html">iswalnum</a>(wint_t);int <a href="iswalpha.html">iswalpha</a>(wint_t);int <a href="iswcntrl.html">iswcntrl</a>(wint_t);int <a href="iswdigit.html">iswdigit</a>(wint_t);int <a href="iswgraph.html">iswgraph</a>(wint_t);int <a href="iswlower.html">iswlower</a>(wint_t);int <a href="iswprint.html">iswprint</a>(wint_t);int <a href="iswpunct.html">iswpunct</a>(wint_t);int <a href="iswspace.html">iswspace</a>(wint_t);int <a href="iswupper.html">iswupper</a>(wint_t);int <a href="iswxdigit.html">iswxdigit</a>(wint_t);int <a href="iswctype.html">iswctype</a>(wint_t, wctype_t);wint_t <a href="fgetwc.html">fgetwc</a>(FILE *);wchar_t *<a href="fgetws.html">fgetws</a>(wchar_t *, int, FILE *);wint_t <a href="fputwc.html">fputwc</a>(wchar_t, FILE *);int <a href="fputws.html">fputws</a>(const wchar_t *, FILE *);int <a href="fwide.html">fwide</a>(FILE *, int);wint_t <a href="getwc.html">getwc</a>(FILE *);wint_t <a href="getwchar.html">getwchar</a>(void);int <a href="mbsinit.html">mbsinit</a>(const mbstate_t *);size_t <a href="mbrlen.html">mbrlen</a>(const char *, size_t, mbstate_t *);size_t <a href="mbrtowc.html">mbrtowc</a>(wchar_t *, const char *, size_t, mbstate_t *);size_t <a href="mbsrtowcs.html">mbsrtowcs</a>(wchar_t *, const char **, size_t, mbstate_t *);wint_t <a href="putwc.html">putwc</a>(wchar_t, FILE *);wint_t <a href="putwchar.html">putwchar</a>(wchar_t);int <a href="swprintf.html">swprintf</a>(wchar_t *, size_t, const wchar_t *, ...);int <a href="swscanf.html">swscanf</a>(const wchar_t *, const wchar_t *, ...);wint_t <a href="towlower.html">towlower</a>(wint_t);wint_t <a href="towupper.html">towupper</a>(wint_t);wint_t <a href="ungetwc.html">ungetwc</a>(wint_t, FILE *);int <a href="vfwprintf.html">vfwprintf</a>(FILE *, const wchar_t *, va_list);int <a href="vwprintf.html">vwprintf</a>(const wchar_t *, va_list);int <a href="vswprintf.html">vswprintf</a>(wchar_t *, size_t, const wchar_t *, va_list);size_t <a href="wcrtomb.html">wcrtomb</a>(char *, wchar_t, mbstate_t *);wchar_t *<a href="wcscat.html">wcscat</a>(wchar_t *, const wchar_t *);wchar_t *<a href="wcschr.html">wcschr</a>(const wchar_t *, wchar_t);int <a href="wcscmp.html">wcscmp</a>(const wchar_t *, const wchar_t *);int <a href="wcscoll.html">wcscoll</a>(const wchar_t *, const wchar_t *);wchar_t *<a href="wcscpy.html">wcscpy</a>(wchar_t *, const wchar_t *);size_t <a href="wcscspn.html">wcscspn</a>(const wchar_t *, const wchar_t *);size_t <a href="wcsftime.html">wcsftime</a>(wchar_t *, size_t, const wchar_t *, const struct tm *);size_t <a href="wcslen.html">wcslen</a>(const wchar_t *);wchar_t *<a href="wcsncat.html">wcsncat</a>(wchar_t *, const wchar_t *, size_t);int <a href="wcsncmp.html">wcsncmp</a>(const wchar_t *, const wchar_t *, size_t);wchar_t *<a href="wcsncpy.html">wcsncpy</a>(wchar_t *, const wchar_t *, size_t);wchar_t *<a href="wcspbrk.html">wcspbrk</a>(const wchar_t *, const wchar_t *);wchar_t *<a href="wcsrchr.html">wcsrchr</a>(const wchar_t *, wchar_t);size_t <a href="wcsrtombs.html">wcsrtombs</a>(char *, const wchar_t **, size_t, mbstate_t *);size_t <a href="wcsspn.html">wcsspn</a>(const wchar_t *, const wchar_t *);wchar_t *<a href="wcsstr.html">wcsstr</a>(const wchar_t *, const wchar_t *);double <a href="wcstod.html">wcstod</a>(const wchar_t *, wchar_t **);wchar_t *<a href="wcstok.html">wcstok</a>(wchar_t *, const wchar_t *, wchar_t **);long int <a href="wcstol.html">wcstol</a>(const wchar_t *, wchar_t **, int);unsigned long int <a href="wcstoul.html">wcstoul</a>(const wchar_t *, wchar_t **, int);wchar_t *<a href="wcswcs.html">wcswcs</a>(const wchar_t *, const wchar_t *);int <a href="wcswidth.html">wcswidth</a>(const wchar_t *, size_t);size_t <a href="wcsxfrm.html">wcsxfrm</a>(wchar_t *, const wchar_t *, size_t);int <a href="wctob.html">wctob</a>(wint_t);wctype_t <a href="wctype.html">wctype</a>(const char *);int <a href="wcwidth.html">wcwidth</a>(wchar_t);wchar_t *<a href="wmemchr.html">wmemchr</a>(const wchar_t *, wchar_t, size_t);int <a href="wmemcmp.html">wmemcmp</a>(const wchar_t *, const wchar_t *, size_t);wchar_t *<a href="wmemcpy.html">wmemcpy</a>(wchar_t *, const wchar_t *, size_t);wchar_t *<a href="wmemmove.html">wmemmove</a>(wchar_t *, const wchar_t *, size_t);wchar_t *<a href="wmemset.html">wmemset</a>(wchar_t *, wchar_t, size_t);int <a href="wprintf.html">wprintf</a>(const wchar_t *, ...);int <a href="wscanf.html">wscanf</a>(const wchar_t *, ...);</code></pre><p><i><wchar.h></i>defines the following macro names:<dl compact><dt>WCHAR_MAX<dd>The maximum value representable by an object of type<b>wchar_t</b>.<dt>WCHAR_MIN<dd>The minimum value representable by an object of type<b>wchar_t</b>.<dt>WEOF<dd>Constant expression of type<b>wint_t</b>that is returned by several WP functions to indicate end-of-file.<dt>NULL<dd>As described in<i><a href="stddef.h.html"><stddef.h></a></i>.</dl><p>The tag<b>tm</b>is declared as naming an incomplete structure type, the contents ofwhich are described in the header<i><a href="time.h.html"><time.h></a></i>.<p>Inclusion of the<i><wchar.h></i>header may make visible all symbols from the headers<i><a href="ctype.h.html"><ctype.h></a></i>,<i><a href="stdio.h.html"><stdio.h></a></i>,<i><a href="stdarg.h.html"><stdarg.h></a></i>,<i><a href="stdlib.h.html"><stdlib.h></a></i>,<i><a href="string.h.html"><string.h></a></i>,<i><a href="stddef.h.html"><stddef.h></a></i>and<i><a href="time.h.html"><time.h></a></i>.</blockquote><h4><a name = "tag_000_010_461"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_462"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_463"> </a>SEE ALSO</h4><blockquote><i><a href="btowc.html">btowc()</a></i>,<i><a href="fwprintf.html">fwprintf()</a></i>,<i><a href="fwscanf.html">fwscanf()</a></i>,<i><a href="iswalnum.html">iswalnum()</a></i>,<i><a href="iswalpha.html">iswalpha()</a></i>,<i><a href="iswcntrl.html">iswcntrl()</a></i>,<i><a href="iswdigit.html">iswdigit()</a></i>,<i><a href="iswgraph.html">iswgraph()</a></i>,<i><a href="iswlower.html">iswlower()</a></i>,<i><a href="iswprint.html">iswprint()</a></i>,<i><a href="iswpunct.html">iswpunct()</a></i>,<i><a href="iswspace.html">iswspace()</a></i>,<i><a href="iswupper.html">iswupper()</a></i>,<i><a href="iswxdigit.html">iswxdigit()</a></i>,<i><a href="iswctype.html">iswctype()</a></i>,<i><a href="fgetwc.html">fgetwc()</a></i>,<i><a href="fgetws.html">fgetws()</a></i>,<i><a href="fputwc.html">fputwc()</a></i>,<i><a href="fputws.html">fputws()</a></i>,<i><a href="fwide.html">fwide()</a></i>,<i><a href="getwc.html">getwc()</a></i>,<i><a href="getwchar.html">getwchar()</a></i>,<i><a href="mbsinit.html">mbsinit()</a></i>,<i><a href="mbrlen.html">mbrlen()</a></i>,<i><a href="mbrtowc.html">mbrtowc()</a></i>,<i><a href="mbsrtowcs.html">mbsrtowcs()</a></i>,<i><a href="putwc.html">putwc()</a></i>,<i><a href="putwchar.html">putwchar()</a></i>,<i><a href="swprintf.html">swprintf()</a></i>,<i><a href="swscanf.html">swscanf()</a></i>,<i><a href="towlower.html">towlower()</a></i>,<i><a href="towupper.html">towupper()</a></i>,<i><a href="ungetwc.html">ungetwc()</a></i>,<i><a href="vfwprintf.html">vfwprintf()</a></i>,<i><a href="vwprintf.html">vwprintf()</a></i>,<i><a href="vswprintf.html">vswprintf()</a></i>,<i><a href="wcrtomb.html">wcrtomb()</a></i>,<i><a href="wcsrtombs.html">wcsrtombs()</a></i>,<i><a href="wcscat.html">wcscat()</a></i>,<i><a href="wcschr.html">wcschr()</a></i>,<i><a href="wcscmp.html">wcscmp()</a></i>,<i><a href="wcscoll.html">wcscoll()</a></i>,<i><a href="wcscpy.html">wcscpy()</a></i>,<i><a href="wcscspn.html">wcscspn()</a></i>,<i><a href="wcsftime.html">wcsftime()</a></i>,<i><a href="wcslen.html">wcslen()</a></i>,<i><a href="wcsncat.html">wcsncat()</a></i>,<i><a href="wcsncmp.html">wcsncmp()</a></i>,<i><a href="wcsncpy.html">wcsncpy()</a></i>,<i><a href="wcspbrk.html">wcspbrk()</a></i>,<i><a href="wcsrchr.html">wcsrchr()</a></i>,<i><a href="wcsspn.html">wcsspn()</a></i>,<i><a href="wcsstr.html">wcsstr()</a></i>,<i><a href="wcstod.html">wcstod()</a></i>,<i><a href="wcstok.html">wcstok()</a></i>,<i><a href="wcstol.html">wcstol()</a></i>,<i><a href="wcstoul.html">wcstoul()</a></i>,<i><a href="wcswcs.html">wcswcs()</a></i>,<i><a href="wcswidth.html">wcswidth()</a></i>,<i><a href="wcsxfrm.html">wcsxfrm()</a></i>,<i><a href="wctob.html">wctob()</a></i>,<i><a href="wctype.html">wctype()</a></i>,<i><a href="wcwidth.html">wcwidth()</a></i>,<i><a href="wmemchr.html">wmemchr()</a></i>,<i><a href="wmemcmp.html">wmemcmp()</a></i>,<i><a href="wmemcpy.html">wmemcpy()</a></i>,<i><a href="wmemmove.html">wmemmove()</a></i>,<i><a href="wmemset.html">wmemset()</a></i>,<i><a href="wprintf.html">wprintf()</a></i>,<i><a href="wscanf.html">wscanf()</a></i>,<i><a href="ctype.h.html"><ctype.h></a></i>,<i><a href="stdio.h.html"><stdio.h></a></i>,<i><a href="stdarg.h.html"><stdarg.h></a></i>,<i><a href="stdlib.h.html"><stdlib.h></a></i>,<i><a href="string.h.html"><string.h></a></i>,<i><a href="stddef.h.html"><stddef.h></a></i>and<i><a href="time.h.html"><time.h></a></i>.</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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