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std::codecvt_utf16

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Bibliothèque localisations
Locales et facettes
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Locales and facets
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locale
Classification des caractères
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Character classification
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Conversions
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Conversions
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Classes de facettes catégorie de base
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Facet category base classes
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Catégories de facettes
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Facet categories
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Spécifique aux paramètres régionaux facettes
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Locale-specific facets
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Facettes de conversion de code
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Code conversion facets
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codecvt_utf8 (C++11)
codecvt_utf16 (C++11)
C locale
Original:
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_utf16 : public std::codecvt<Elem, char, std::mbstate_t>;;
std::codecvt_utf16 est une facette std::codecvt qui encapsule conversion entre une chaîne d'octets UTF-16 codé et UCS2 ou UCS4 chaîne de caractères (en fonction du type de Elem). Cette facette codecvt peut être utilisé pour lire et écrire des fichiers UTF-16 en mode binaire .
Original:
std::codecvt_utf16 is a std::codecvt facet which encapsulates conversion between a UTF-16 encoded byte string and UCS2 or UCS4 character string (depending on the type of Elem). This codecvt facet can be used to read and write UTF-16 files in binary mode.
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Sommaire

[modifier] Paramètres de modèle

Elem -
char16_t supporte, char32_t, ou wchar_t
Original:
either char16_t, char32_t, or wchar_t
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Maxcode -
la plus grande valeur de Elem que cette facette va lire ou écrire sans erreur
Original:
the largest value of Elem that this facet will read or write without error
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Mode -
une constante de std::codecvt_mode type
Original:
a constant of type std::codecvt_mode
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Inherited from std::codecvt

Member types

Type du membre Définition
intern_type internT
extern_type externT
state_type stateT

Member objects

Nom du membre
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Member name
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Type
id (
statique
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static
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)
std::locale::id

Member functions

Invoque do_out
Original:
invokes do_out
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(fonction membre publique de std::codecvt) [edit]
Invoque do_in
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invokes do_in
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(fonction membre publique de std::codecvt) [edit]
Invoque do_unshift
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invokes do_unshift
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(fonction membre publique de std::codecvt) [edit]
Invoque do_encoding
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invokes do_encoding
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(fonction membre publique de std::codecvt) [edit]
Invoque do_always_noconv
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invokes do_always_noconv
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(fonction membre publique de std::codecvt) [edit]
Invoque do_length
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invokes do_length
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(fonction membre publique de std::codecvt) [edit]
Invoque do_max_length
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invokes do_max_length
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(fonction membre publique de std::codecvt) [edit]

Protected member functions

[
virtuel
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virtual
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]
convertit une chaîne de Internt à Externt, comme lors de l'écriture dans un fichier
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converts a string from internT to externT, such as when writing to file
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(fonction membre virtuelle protégée de std::codecvt) [edit]
[
virtuel
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virtual
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convertit une chaîne de Externt à internt, comme lors de la lecture du fichier
Original:
converts a string from externT to internT, such as when reading from file
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(fonction membre virtuelle protégée de std::codecvt) [edit]
[
virtuel
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virtual
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génère la séquence de caractères de terminaison de caractères Externt pour la conversion incomplète
Original:
generates the termination character sequence of externT characters for incomplete conversion
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(fonction membre virtuelle protégée de std::codecvt) [edit]
[
virtuel
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virtual
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retourne le nombre de caractères Externt nécessaires pour produire une Internt caractère, si constante
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returns the number of externT characters necessary to produce one internT character, if constant
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(fonction membre virtuelle protégée de std::codecvt) [edit]
[
virtuel
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virtual
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]
Teste si la facette code pour une conversion d'identité pour toutes les valeurs des arguments valables
Original:
tests if the facet encodes an identity conversion for all valid argument values
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(fonction membre virtuelle protégée de std::codecvt) [edit]
[
virtuel
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virtual
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calcule la longueur de la chaîne Externt qui serait consommée par conversion en tampon Internt proposée
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calculates the length of the externT string that would be consumed by conversion into given internT buffer
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(fonction membre virtuelle protégée de std::codecvt) [edit]
[
virtuel
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virtual
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retourne le nombre de caractères maximum Externt qui pourraient être transformés en un seul caractère Internt
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returns the maximum number of externT characters that could be converted into a single internT character
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(fonction membre virtuelle protégée de std::codecvt) [edit]


Inherited from std::codecvt_base

Type du membre Définition
enum result { ok, partial, error, noconv };
Type d'énumération sans portée
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Unscoped enumeration type
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Énumération constante
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Enumeration constant
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Definition
ok
conversion a été effectuée sans erreur
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conversion was completed with no error
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partial
tous les caractères de source ont été converties
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not all source characters were converted
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error
rencontré un caractère non valide
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encountered an invalid character
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noconv
aucune conversion n'est requise, l'entrée et les types de sortie sont les mêmes
Original:
no conversion required, input and output types are the same
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[modifier] Exemple

L'exemple suivant illustre le décodage de UTF-16LE fichier sur un système 32-bit avec wchar_t. Sur un système avec 16-bit wchar_t, le décodage du troisième caractère échouera car std::codecvt_utf16<char16_t> produit UCS2, pas UTF-16 .
Original:
The following example demonstrates decoding of UTF-16le file on a system with 32-bit wchar_t. On a system with 16-bit wchar_t, decoding of the third character will fail because std::codecvt_utf16<char16_t> produces UCS2, not UTF-16.
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#include <fstream>
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
void prepare_file()
{
    // UTF-16le data (if host system is little-endian)
    char16_t utf16le[4] ={0x007a,          // latin small letter 'z' U+007a
                          0x6c34,          // CJK ideograph "water"  U+6c34
                          0xd834, 0xdd0b}; // musical sign segno U+1d10b
    // store in a file
    std::ofstream fout("text.txt");
    fout.write( reinterpret_cast<char*>(utf16le), sizeof utf16le);
}
int main()
{
    prepare_file();
    // open as a byte stream
    std::wifstream fin("text.txt", std::ios::binary);
    // apply facet
    fin.imbue(std::locale(fin.getloc(),
       new std::codecvt_utf16<wchar_t, 0x10ffff, std::little_endian>));
 
    for(wchar_t c; fin.get(c); )
            std::cout << std::showbase << std::hex << c << '\n';
}

Résultat :

0x7a
0x6c34
0x1d10b

[modifier] Voir aussi

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
convertis entre les codages de caractères, y compris UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(classe générique) [edit]
balises pour modifier le comportement des facettes codecvt standard
Original:
tags to alter behavior of the standard codecvt facets
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(classe) [edit]
convertit entre UTF-8 et UCS2/UCS4
Original:
converts between UTF-8 and UCS2/UCS4
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(classe générique) [edit]
converts between UTF-8 and UTF-16
(classe générique) [edit]