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std::wstring_convert::from_bytes

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Localizaciones biblioteca
Locales y facetas
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Locales and facets
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locale
Carácter clasificación
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Character classification
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Conversiones
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Conversions
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Facet clases categoría base
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Facet category base classes
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Categorías faceta
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Facet categories
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Específico de la localidad facetas
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Locale-specific facets
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Facetas código de conversión
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Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C locale
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C locale
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std::wstring_convert
Las funciones miembro
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Member functions
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wstring_convert::wstring_convert
wstring_convert::~wstring_convert
wstring_convert::from_bytes
wstring_convert::to_bytes
wstring_convert::converted
wstring_convert::state
 
Defined in header <locale>
wide_string from_bytes( char byte );
(1)
wide_string from_bytes( const char* ptr );
(2)
wide_string from_bytes( const byte_string& str );
(3)
wide_string from_bytes( const char* first, const char* last);
(4)
Realiza varios bytes a la conversión de ancho, utilizando la faceta codecvt suministrada en construcción .
Original:
Performs multibyte to wide conversion, using the codecvt facet supplied at construction.
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1)
Convierte byte como si fuera una cadena de longitud 1 a wide_string
Original:
Converts byte as if it was a string of length 1 to wide_string
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2)
Convierte la terminación nula carácter multibyte secuencia que comienza en el carácter al que apunta ptr a wide_string
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Converts the null-terminated multibyte character sequence beginning at the character pointed to by ptr to wide_string
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3)
Convierte la cadena str estrecho para wide_string .
Original:
Converts the narrow string str to wide_string.
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4)
Convierte el carácter multibyte estrecho [first, last) secuencia para wide_string
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Converts the narrow multibyte character sequence [first, last) to wide_string
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En todos los casos, la conversión comienza en el estado inicial de cambios, a menos que no inicial estado de partida se proporcionó a este constructor wstring_convert. El número de caracteres convertidos y el valor final del estado de conversión se recuerdan y se puede acceder con state() y 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()
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Contenido

[editar] Valor de retorno

Un objeto wide_string con los resultados de varios bytes de conversión gran angular. Si la conversión no y había un suministrado por el usuario a gran error cadena proporcionada al constructor de esta wstring_convert, que devuelve gran error cadena .
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.
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[editar] Excepciones

Si este objeto wstring_convert se construyó sin un usuario suministrado por gran error cuerda, tira std::range_error en caso de fallo de conversión .
Original:
If this wstring_convert object was constructed without a user-supplied wide-error string, throws std::range_error on conversion failure.
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[editar] Ejemplo

#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';
}

Output:

UTF16 conversion produced 5 code points:
0x7a
0xdf
0x6c34
0xd834
0xdd0b
UTF32 conversion produced 4 code points:
0x7a
0xdf
0x6c34
0x1d10b

[editar] Ver también

convierte una cadena de ancho en una cadena de bytes
Original:
converts a wide string into a byte string
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(miembro público función) [edit]
convierte una cadena de caracteres multibyte estrecho a la cadena de ancho, estado dado
Original:
converts a narrow multibyte character string to wide string, given state
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(función) [edit]
[virtual]
convierte una cadena de externT a internt, como cuando al leer el archivo
Original:
converts a string from externT to internT, such as when reading from file
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(virtuales protegidos of std::codecvt miembro de función) [edit]