November 2016
Beginner to intermediate
816 pages
19h 58m
Japanese
Content preview from Cクイックリファレンス 第2版
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wctomb
643
■
参照
●
wctomb()
,
wcrtomb()
,
wcstombs()
,
wcsrtombs()
●
btowc()
,
mbtowc()
,
mbrtowc()
,
mbstowcs()
,
mbsrtowcs()
wctomb
ワイド文字をマルチバイト文字に変換するか、マルチバイト符号化が状態を持つか決定する
#include <stdlib.h>
int wctomb(char*
s
, wchar_t
wc
);
wctomb()
関数はワイド文字値
wc
に対応するマルチバイト表現を決定して、必要なシフト
シーケンスを含めてポインタ引数
s
が指す
char
配列に格納する。マルチバイト文字表現を
収められるように、この配列のサイズは少なくとも
MB_CUR_MAX
と想定される。
wc
がナルワ
イド文字（
L'\0'
）なら、
wctomb()
は、初期シフト状態を復元するために必要なシフトシー
ケンスの後にナル文字を
s
が指す
char
配列に格納する。関数は書いたマルチバイトシーケ
ンスのバイト数を返すか、
wc
の値がどの正当なマルチバイト文字にも相当しないなら−1を
返す。
wctomb()
の第1引数にナルポインタを渡すなら、戻り値は現在のマルチバイト符号化が
状態を持つかどうかを示す。この振る舞いは
mblen()
と同じ。
wctomb()
が0を返すなら、符
号化は状態を持たない。他の値を返すなら、符号化は状態を持つ。すなわち、バイトシー
ケンスの解釈はシフト状態に依存することがある。
■
例
printf("The ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.