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std::codecvt_utf8_utf16

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< cpp‎ | locale

 
 
Localizzazioni libreria
Impostazioni internazionali e sfaccettature
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Locales and facets
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locale
Carattere classificazione
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Character classification
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Conversioni
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Conversions
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Facet categoria classi di base
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Facet category base classes
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Facet categorie
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Facet categories
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Locale specifici aspetti
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Locale-specific facets
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Codice di conversione sfaccettature
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Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
codecvt_utf8_utf16(C++11)
codecvt_mode(C++11)
C locale
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C locale
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Defined in header <codecvt>
template< class Elem,

          unsigned long Maxcode = 0x10ffff,
          std::codecvt_mode Mode = (std::codecvt_mode)0 >

class codecvt_utf8_utf16 : public std::codecvt<Elem, char, std::mbstate_t>;
std::codecvt_utf8_utf16 è un aspetto std::codecvt che incapsula la conversione tra una stringa UTF-8 byte codificata e UTF-16 stringa di caratteri codificata Se Elem è un 32... - tipo di bit, un valore di codice UTF-16 viene memorizzato in ciascun carattere a 32 bit della sequenza di emissione. codecvt Questo aspetto può essere utilizzato per leggere e scrivere file UTF-8, sia di testo e binari.
Original:
std::codecvt_utf8_utf16 is a std::codecvt facet which encapsulates conversion between a UTF-8 encoded byte string and UTF-16 encoded character string. If Elem is a 32-bit type, one UTF-16 codepoint will be stored in each 32-bit character of the output sequence. This codecvt facet can be used to read and write UTF-8 files, both text and binary.
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Indice

[modifica] Template Parametri

Elem -
sia char16_t, char32_t o wchar_t
Original:
either char16_t, char32_t, or wchar_t
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Maxcode -
il più grande valore di Elem che questo aspetto sarà leggere o scrivere senza errori
Original:
the largest value of Elem that this facet will read or write without error
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Mode -
una costante di std::codecvt_mode tipo
Original:
a constant of type std::codecvt_mode
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Inherited from std::codecvt

Member types

Membro tipo
Original:
Member type
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Definition
intern_type internT
extern_type externT
state_type stateT

Member objects

Persona
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Member name
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Type
id (statico) std::locale::id

Member functions

Invoca do_out
Original:
invokes do_out
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_in
Original:
invokes do_in
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_unshift
Original:
invokes do_unshift
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_encoding
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invokes do_encoding
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_always_noconv
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invokes do_always_noconv
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_length
Original:
invokes do_length
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(membro pubblico of std::codecvt funzione) [edit]
Invoca do_max_length
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invokes do_max_length
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(membro pubblico of std::codecvt funzione) [edit]

Protected member functions

[virtuale]
converte una stringa da internt a externT, come ad esempio durante la scrittura su file
Original:
converts a string from internT to externT, such as when writing to file
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(virtuale protetto funzione of std::codecvt membro) [edit]
[virtuale]
converte una stringa da externT a internt, come ad esempio durante la lettura dal file
Original:
converts a string from externT to internT, such as when reading from file
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(virtuale protetto funzione of std::codecvt membro) [edit]
[virtuale]
genera la sequenza di caratteri di terminazione di caratteri externT per la conversione incompleta
Original:
generates the termination character sequence of externT characters for incomplete conversion
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(virtuale protetto funzione of std::codecvt membro) [edit]
[virtuale]
restituisce il numero di caratteri externT necessari a produrre un carattere internt, se costante
Original:
returns the number of externT characters necessary to produce one internT character, if constant
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(virtuale protetto funzione of std::codecvt membro) [edit]
Verifica se la faccetta codifica una conversione di identità per tutti i valori degli argomenti validi
Original:
tests if the facet encodes an identity conversion for all valid argument values
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(virtuale protetto funzione of std::codecvt membro) [edit]
[virtuale]
calcola la lunghezza della stringa externT che sarebbe consumata dalla conversione in tampone internt dato
Original:
calculates the length of the externT string that would be consumed by conversion into given internT buffer
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(virtuale protetto funzione of std::codecvt membro) [edit]
[virtuale]
restituisce il numero massimo di caratteri externT che può essere convertito in un singolo carattere internt
Original:
returns the maximum number of externT characters that could be converted into a single internT character
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(virtuale protetto funzione of std::codecvt membro) [edit]


Inherited from std::codecvt_base

Membro tipo
Original:
Member type
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Definition
enum result { ok, partial, error, noconv };
Enumerazione senza ambito
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Unscoped enumeration type
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Enumerazione costante
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Enumeration constant
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Definition
ok
conversione è stata completata senza errori
Original:
conversion was completed with no error
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partial
non tutti i caratteri di origine sono stati convertiti
Original:
not all source characters were converted
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error
rilevato un carattere non valido
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encountered an invalid character
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noconv
non essere effettuata la conversione, di ingresso e di tipi di output sono gli stessi
Original:
no conversion required, input and output types are the same
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[modifica] Esempio

L'esempio seguente mostra la lettura di un UTF -8 file in una stringa UTF-16 su un sistema a 32-bit wchar_t
Original:
The following example demonstrates reading a UTF-8 file into a UTF-16 string on a system with 32-bit wchar_t
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#include <fstream>
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
    std::ofstream("text.txt") << u8"z\u6c34\U0001d10b";
 
    std::wifstream file1("text.txt");
    file1.imbue(std::locale("en_US.UTF8"));
    std::cout << "Normal read from file (using default UTF-8/UTF-32 codecvt)\n";
    for(wchar_t c; file1 >> c; )
        std::cout << std::hex << std::showbase << c << '\n';
 
    std::wifstream file2("text.txt");
    file2.imbue(std::locale(file2.getloc(), new std::codecvt_utf8_utf16<wchar_t>));
    std::cout << "UTF-16 read from the same file (using codecvt_utf8_utf16)\n";
    for(wchar_t c; file2 >> c; )
        std::cout << std::hex << std::showbase << c << '\n';
}

Output:

Normal read from file (using default UTF-8/UTF-32 codecvt)
0x7a
0x6c34
0x1d10b
UTF-16 read from the same file (using codecvt_utf8_utf16)
0x7a
0x6c34
0xd834
0xdd0b

[modifica] Vedi anche

Character
conversions
narrow multibyte
(char)
UTF-8
(char)
UTF-16
(char16_t)
UTF-16 mbrtoc16 / c16rtomb codecvt<char16_t, char, mbstate_t>
codecvt_utf8_utf16<char16_t>
codecvt_utf8_utf16<char32_t>
codecvt_utf8_utf16<wchar_t>
N/A
UCS2 No codecvt_utf8<char16_t> codecvt_utf16<char16_t>
UTF-32/UCS4
(char32_t)
mbrtoc32 / c32rtomb codecvt<char32_t, char, mbstate_t>
codecvt_utf8<char32_t>
codecvt_utf16<char32_t>
UCS2/UCS4
(wchar_t)
No codecvt_utf8<wchar_t> codecvt_utf16<wchar_t>
wide
(wchar_t)
codecvt<wchar_t, char, mbstate_t>
mbsrtowcs / wcsrtombs
No No
converte tra codifiche dei caratteri, tra cui UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(classe template) [edit]
tag per alterare il comportamento delle faccette codecvt standard
Original:
tags to alter behavior of the standard codecvt facets
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(classe) [edit]
converte tra UTF-8 e UCS2/UCS4
Original:
converts between UTF-8 and UCS2/UCS4
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(classe template) [edit]
converte tra UTF-16 e UCS2/UCS4
Original:
converts between UTF-16 and UCS2/UCS4
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(classe template) [edit]