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std::mbrtowc

Da cppreference.com
< cpp‎ | string‎ | multibyte

 
 
Biblioteca cordas
Strings terminadas
Original:
Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
Original:
Classes
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basic_string
char_traits
 
Strings terminadas multibyte
Wide / multibyte conversões
Original:
Wide/multibyte conversions
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mbsinit
Tipos
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 );
Converte um caractere multibyte estreita para um caractere largo.
Original:
Converts a narrow multibyte character to a wide character.
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Se s não é um ponteiro nulo, inspeciona a maioria dos bytes n da cadeia de caracteres multibyte, começando com o byte apontado pelo s para determinar o número de bytes necessários para completar o personagem multibyte seguinte (incluindo as seqüências de turnos). Se a função determina que o caráter de multibyte próximo s é completa e válida, converte-lo para o personagem correspondente de largura e armazena em *pwc (se pwc não é nulo).
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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Se s é um ponteiro nulo, os valores de n e pwc chamada são ignorados e é equivalente a std::mbrtowc(NULL, "", 1, ps).
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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Se o personagem de largura produzida é o caractere nulo, o estado de conversão armazenado em *ps é o estado deslocamento inicial.
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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Índice

[editar] Parâmetros

pwc -
ponteiro para o local onde o personagem largo resultante será escrito
Original:
pointer to the location where the resulting wide character will be written
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s -
ponteiro para a cadeia de caracteres multibyte usado como entrada
Original:
pointer to the multibyte character string used as input
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n -
limitar o número de bytes em s que podem ser examinados
Original:
limit on the number of bytes in s that can be examined
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ps -
ponteiro para o estado de conversão utilizado ao interpretar a string multibyte
Original:
pointer to the conversion state used when interpreting the multibyte string
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[editar] Valor de retorno

O primeiro dos seguintes que se aplica:
Original:
The first of the following that applies:
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  • 0 se o personagem convertido de s (e armazenados na pwc se não nulo) foi o caractere nulo
    Original:
    0 if the character converted from s (and stored in pwc if non-null) was the null character
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  • o número de bytes [1...n] do caractere multibyte convertidos com êxito a partir de s
    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) se os bytes n próximos constituem um incompleta, mas até agora válida personagem, multibyte. Nada é escrito para *pwc.
    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) se ocorre erro de codificação. Nada é escrito para *pwc, o EILSEQ valor é armazenado no errno e o valor de *ps é deixado indeterminado.
    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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[editar] Exemplo

#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 𝄋

[editar] Veja também

converte o caractere multibyte ao lado de caracteres largos
Original:
converts the next multibyte character to wide character
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(função) [edit]
converte um caractere largo em sua representação multibyte, determinado estado
Original:
converts a wide character to its multibyte representation, given state
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(função) [edit]
[virtual]
Converte uma cadeia de externT a Internt, como quando lendo de um arquivo
Original:
converts a string from externT to internT, such as when reading from file
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(virtual protegido of std::codecvt função de membro) [edit]
C documentation for mbrtowc