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std::mbtowc

De cppreference.com
< cpp‎ | string‎ | multibyte

 
 
Strings biblioteca
Terminadas en nulo
Original:
Null-terminated strings
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Cadenas de bytes
Multibyte cuerdas
Cadenas anchas
Clases
Original:
Classes
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basic_string
char_traits
 
Terminadas en nulo de varios bytes
Ancho / multibyte conversiones
Original:
Wide/multibyte conversions
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mbsinit
Tipos
Original:
Types
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mbstate_t
 
Defined in header <cstdlib>
int mbtowc( wchar_t* pwc, const char* s, std::size_t n )
Convierte un carácter multibyte cuyo primer byte es apuntado por s a un carácter ancho, escrita a *pwc pwc si no es nulo .
Original:
Converts a multibyte character whose first byte is pointed to by s to a wide character, written to *pwc if pwc is not null.
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Si s es un puntero nulo, se restablece el estado de conversión global y determina si las secuencias de desplazamiento se utilizan .
Original:
If s is a null pointer, resets the global conversion state and determines whether shift sequences are used.
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Contenido

[editar] Parámetros

s -
puntero al carácter multibyte
Original:
pointer to the multibyte character
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n -
limitar el número de bytes en s que puede ser examinado
Original:
limit on the number of bytes in s that can be examined
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pwc -
puntero al carácter ancho para la salida
Original:
pointer to the wide character for output
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[editar] Valor de retorno

Si s no es un puntero nulo, devuelve el número de bytes que se contienen en el carácter multibyte o -1 si los primeros bytes que apunta s no forman un carácter multibyte válida o si 0 s está apuntando a la charcter nulo '\0' .
Original:
If s is not a null pointer, returns the number of bytes that are contained in the multibyte character or -1 if the first bytes pointed to by s do not form a valid multibyte character or 0 if s is pointing at the null charcter '\0'.
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Si s es un puntero nulo, restablece su estado de conversión interna para representar el estado inicial de cambios y devoluciones si 0 la codificación multibyte actual no es dependiente del estado (no utiliza secuencias de turnos) o un valor distinto de cero si la codificación multibyte actual es dependiente del estado (utiliza secuencias de turnos) .
Original:
If s is a null pointer, resets its internal conversion state to represent the initial shift state and returns 0 if the current multibyte encoding is not state-dependent (does not use shift sequences) or a non-zero value if the current multibyte encoding is state-dependent (uses shift sequences).
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[editar] Notas

Cada llamada a las actualizaciones de estado interno mbtowc la conversión global (un objeto estático de std::mbstate_t tipo, sólo se sabe que esta función). Si la codificación multibyte utiliza estados de cambio, se debe tener cuidado para evitar las exploraciones de rastreo o múltiples. En cualquier caso, varios subprocesos no debe llamar mbtowc sin sincronización: std::mbrtowc lugar se puede utilizar .
Original:
Each call to mbtowc updates the internal global conversion state (a static object of type std::mbstate_t, only known to this function). If the multibyte encoding uses shift states, care must be taken to avoid backtracking or multiple scans. In any case, multiple threads should not call mbtowc without synchronization: std::mbrtowc may be used instead.
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[editar] Ejemplo

#include <iostream>
#include <clocale>
#include <cstring>
#include <cstdlib>
 
int print_mb(const char* ptr)
{
    std::mbtowc(NULL, 0, 0); // reset the conversion state
    const char* end = ptr + std::strlen(ptr);
    int ret;
    for (wchar_t wc; (ret = std::mbtowc(&wc, ptr, end-ptr)) > 0; ptr+=ret) {
        std::wcout << wc;
    }
    std::wcout << '\n';
    return ret;
}
 
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:

zß水𝄋

[editar] Ver también

convierte el carácter multibyte junto al carácter amplio, estado dado
Original:
converts the next multibyte character to wide character, given state
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(función) [edit]
devuelve el número de bytes en el carácter multibyte siguiente
Original:
returns the number of bytes in the next multibyte character
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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]
C documentation for mbtowc