std::wstring_convert::from_bytes
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<tbody> </tbody>| Definido no cabeçalho <locale>
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wide_string from_bytes( char byte ); |
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wide_string from_bytes( const char* ptr ); |
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wide_string from_bytes( const byte_string& str ); |
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wide_string from_bytes( const char* first, const char* last); |
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Executa multibyte para conversão de largura, usando a faceta codecvt fornecidos em construção.
Original:
Performs multibyte to wide conversion, using the codecvt facet supplied at construction.
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1)
Converte
byte como se fosse uma corda de comprimento para 1 wide_stringOriginal:
Converts
byte as if it was a string of length 1 to wide_stringThe text has been machine-translated via Google Translate.
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2)
Converte terminada em nulo multibyte início seqüência de caracteres no caracter apontado por
ptr para wide_stringOriginal:
Converts the null-terminated multibyte character sequence beginning at the character pointed to by
ptr to wide_stringThe text has been machine-translated via Google Translate.
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3)
Converte o
str corda estreita para wide_string.Original:
Converts the narrow string
str to wide_string.The text has been machine-translated via Google Translate.
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4)
Converte o estreito multibyte
[first, last) seqüência de caracteres para wide_stringOriginal:
Converts the narrow multibyte character sequence
[first, last) to wide_stringThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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Em todos os casos, a conversão começa no estado de deslocamento inicial, a menos que não inicial estado de partida, foi fornecida a este construtor
wstring_convert. O número de caracteres convertidos eo valor final do estado de conversão são lembrados e pode ser acessado com state() e converted()Original:
In all cases, the conversion begins in initial shift state, unless non-initial starting state was provided to this
wstring_convert constructor. The number of characters converted and the final value of the conversion state are remembered and can be accessed with state() and converted()The text has been machine-translated via Google Translate.
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Valor de retorno
Um objeto
wide_string contendo os resultados da multibyte para conversão de largura. Se a conversão falhou e houve um fornecido pelo usuário string de erro de largura fornecido para o construtor desta wstring_convert, retorna esta cadeia de erro de largura.Original:
A
wide_string object containing the results of multibyte to wide conversion. If the conversion failed and there was a user-supplied wide-error string provided to the constructor of this wstring_convert, returns that wide-error string.The text has been machine-translated via Google Translate.
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Exceções
Se este objeto
wstring_convert foi construído sem fornecido pelo usuário string de erro de largura, joga std::range_error em caso de falha de conversão.Original:
If this
wstring_convert object was constructed without a user-supplied wide-error string, throws std::range_error on conversion failure.The text has been machine-translated via Google Translate.
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Exemplo
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
std::string utf8 = u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
// or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
// the UTF-8 / UTF-16 standard conversion facet
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> utf16conv;
std::u16string utf16 = utf16conv.from_bytes(utf8.data());
std::cout << "UTF16 conversion produced " << utf16.size() << " code points:\n";
for(char16_t c : utf16)
std::cout << std::hex << std::showbase << c << '\n';
// the UTF-8 / UTF-32 standard conversion facet
std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> utf32conv;
std::u32string utf32 = utf32conv.from_bytes(utf8);
std::cout << "UTF32 conversion produced " << std::dec << utf32.size() << " code points:\n";
for(char32_t c : utf32)
std::cout << std::hex << std::showbase << c << '\n';
}
Saída:
UTF16 conversion produced 5 code points:
0x7a
0xdf
0x6c34
0xd834
0xdd0b
UTF32 conversion produced 4 code points:
0x7a
0xdf
0x6c34
0x1d10b
Veja também
converte uma cadeia de largura em uma seqüência de bytes Original: converts a wide string into a byte string The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
converte uma cadeia de caracteres multibyte estreita para string de largura, determinado estado Original: converts a narrow multibyte character string to wide string, given state The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) | |
[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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtual protegido of std::codecvt função de membro)
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