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std::codecvt_mode - cppreference.com

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Definido no cabeçalho

<locale>

enum codecvt_mode { consume_header = 4, generate_header = 2, little_endian = 1 };

As facetas std::codecvt_utf8, std::codecvt_utf16, e std::codecvt_utf8_utf16 aceitar um valor opcional de std::codecvt_mode tipo como um argumento de modelo, que especifica os recursos opcionais da conversão string unicode.

Original:

The facets std::codecvt_utf8, std::codecvt_utf16, and std::codecvt_utf8_utf16 accept an optional value of type std::codecvt_mode as a template argument, which specifies optional features of the unicode string conversion.

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Constantes

Defined in header <locale>

Valor

Original:

Value

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 Meaning
little_endian

assumir a entrada é em little-endian ordem de byte (aplica-se a UTF-16 única entrada, o padrão é big-endian)

Original:

assume the input is in little-endian byte order (applies to UTF-16 input only, the default is big-endian)

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consume_header

consumir a marca de ordem de byte, se presente no início da sequência de entrada, e (no caso de UTF-16), contam com a ordem de byte que especifica para descodificar o resto da entrada

Original:

consume the byte order mark, if present at the start of input sequence, and (in case of UTF-16), rely on the byte order it specifies for decoding the rest of the input

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generate_header

a saída do sinal de ordem de byte no início da sequência de saída

Original:

output the byte order mark at the start of the output sequence

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As marcas de ordem de byte são reconhecidos:

Original:

The recognized byte order marks are:

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0xfe 0xff

UTF-16 big-endian

Original:

UTF-16 big-endian

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0xff 0xfe

UTF-16 little-endian

Original:

UTF-16 little-endian

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0xef 0xbb 0xbf

UTF-8 (nenhum efeito na ordenação)

Original:

UTF-8 (no effect on endianness)

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Se não for selecionado std::consume_header ao ler um arquivo com início marca de ordem de byte, o caractere Unicode U + FEFF (Zero largura do espaço não-quebra) será lido como o primeiro caractere do conteúdo da string.

Original:

If std::consume_header is not selected when reading a file beginning with byte order mark, the Unicode character U+FEFF (Zero width non-breaking space) will be read as the first character of the string content.

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Exemplo

O exemplo a seguir demonstra a consumir a UTF-8 BOM

Original:

The following example demonstrates consuming the UTF-8 BOM

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#include <fstream>
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
    // UTF-8 data with BOM
    std::ofstream("text.txt") << u8"\ufeffz\u6c34\U0001d10b";
    // read the UTF8 file, skipping the BOM
    std::wifstream fin("text.txt");
    fin.imbue(std::locale(fin.getloc(),
                          new std::codecvt_utf8<wchar_t, 0x10ffff, std::consume_header>));
    for(wchar_t c; fin.get(c); )
        std::cout << std::hex << std::showbase << c << '\n';
}

Saída:

Veja também

Converte entre codificações de caracteres, incluindo UTF-8, UTF-16, UTF-32

Original:

converts between character encodings, including UTF-8, UTF-16, UTF-32

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(modelo de classe) [edit]

converte entre UTF-8 e UCS2/UCS4

Original:

converts between UTF-8 and UCS2/UCS4

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(modelo de classe) [edit]

converte entre UTF-16 e UCS2/UCS4

Original:

converts between UTF-16 and UCS2/UCS4

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(modelo de classe) [edit]
converts between UTF-8 and UTF-16
(modelo de classe) [edit]