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std::mbrtowc

提供: cppreference.com
< cpp‎ | string‎ | multibyte

 
 
ストリングスライブラリ
NULLで終わる文字列
Original:
Null-terminated strings
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バイト文字列
文字列をマルチバイト
ワイド文字列
クラス
Original:
Classes
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basic_string
char_traits
 
NULLで終わるマルチバイト文字列
マルチバイト/ワイドコンバージョン
Original:
Wide/multibyte conversions
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mbsinit
タイプ
Original:
Types
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mbstate_t
 
Defined in header <cwchar>
std::size_t mbrtowc( wchar_t* pwc,

                     const char* s,
                     std::size_t n,

                     std::mbstate_t* ps );
ワイド文字に狭いマルチバイト文字に変換し.
Original:
Converts a narrow multibyte character to a wide character.
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sがNULLポインタでない場合は、次のマルチバイト文字(任意のシフトシーケンスを含む)を完了するのに必要なバイト数を決定するためにnが指すバイトから始めて、マルチバイト文字列の中で最もsバイトを検査します。関数はsで次のマルチバイト文字が完全かつ有効であると判断した場合、対応するワイド文字に変換して*pwcに格納(pwcnullでない場合).
Original:
If s is not a null pointer, inspects at most n bytes of the multibyte character string, beginning with the byte pointed to by s to determine the number of bytes necessary to complete the next multibyte character (including any shift sequences). If the function determines that the next multibyte character in s is complete and valid, converts it to the corresponding wide character and stores it in *pwc (if pwc is not null).
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sがNULLポインターである場合、値はnpwc無視され、コールがstd::mbrtowc(NULL, "", 1, ps)と同等です.
Original:
If s is a null pointer, the values of n and pwc are ignored and call is equivalent to std::mbrtowc(NULL, "", 1, ps).
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生産ワイド文字がヌル文字である場合、*psに格納されている変換状態は初期シフト状態です.
Original:
If the wide character produced is the null character, the conversion state stored in *ps is the initial shift state.
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目次

[編集] パラメータ

pwc -
結果のワイド文字が書き込まれる場所へのポインタ
Original:
pointer to the location where the resulting wide character will be written
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s -
入力として使用されるマルチバイト文字列へのポインタ
Original:
pointer to the multibyte character string used as input
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n -
調べることができますsのバイト数を制限しません
Original:
limit on the number of bytes in s that can be examined
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ps -
マルチバイト文字列を解釈する際に使用される変換状態へのポインタ
Original:
pointer to the conversion state used when interpreting the multibyte string
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[編集] 値を返します

:適用される次の最初
Original:
The first of the following that applies:
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  • 0ヌル文字であった文字はsから変換(null以外の場合とpwcに格納されている)場合
    Original:
    0 if the character converted from s (and stored in pwc if non-null) was the null character
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  • バイト数[1...n]首尾sから変換されたマルチバイト文字の
    Original:
    the number of bytes [1...n] of the multibyte character successfully converted from s
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  • static_cast<std::size_t>(-2)次回nバイトが不完全だが、今のところ有効なマルチバイト文字で構成されている場合。何も*pwcに書き込まれません.
    Original:
    static_cast<std::size_t>(-2) if the next n bytes constitute an incomplete, but so far valid, multibyte character. Nothing is written to *pwc.
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  • static_cast<std::size_t>(-1)符号化エラーが発生した場合。何も*pwcに書き込まれません、値EILSEQerrnoに格納されており、*psの値は不特定のままにされ.
    Original:
    static_cast<std::size_t>(-1) if encoding error occurs. Nothing is written to *pwc, the value EILSEQ is stored in errno and the value of *ps is left unspecified.
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[編集]

#include <iostream>
#include <clocale>
#include <cstring>
#include <cwchar>
 
void print_mb(const char* ptr)
{
    std::mbstate_t state = std::mbstate_t(); // initial state
    const char* end = ptr + std::strlen(ptr);
    int len;
    wchar_t wc;
    while((len = std::mbrtowc(&wc, ptr, end-ptr, &state)) > 0) {
        std::wcout << "Next " << len << " bytes are the character " << wc << '\n';
        ptr += len;
    }
}
 
int main()
{
    std::setlocale(LC_ALL, "en_US.utf8");
    // UTF-8 narrow multibyte encoding
    const char* str = u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                      // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
    print_mb(str);
}

Output:

Next 1 bytes are the character z
Next 2 bytes are the character ß
Next 3 bytes are the character 水
Next 4 bytes are the character 𝄋

[編集] も参照してください

ワイド文字に次のマルチバイト文字に変換します
Original:
converts the next multibyte character to wide character
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(機能) [edit]
そのマルチバイト表現、所定の状態にワイド文字に変換します
Original:
converts a wide character to its multibyte representation, given state
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(機能) [edit]
[仮想]
そのようなファイルからの読み込みの場合のように、externTからinternTに文字列を変換します
Original:
converts a string from externT to internT, such as when reading from file
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(仮想protectedメンバ関数of std::codecvt) [edit]
C documentation for mbrtowc