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std::wstring_convert::to_bytes

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Bibliothèque localisations
Locales et facettes
Original:
Locales and facets
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locale
Classification des caractères
Original:
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
Original:
Code conversion facets
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codecvt_utf8 (C++11)
codecvt_utf16 (C++11)
C locale
Original:
C locale
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std::wstring_convert
Les fonctions membres
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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>
byte_string to_bytes( Elem wchar );
(1)
byte_string to_bytes( const Elem* wptr );
(2)
byte_string to_bytes( const wide_string& wstr );
(3)
byte_string to_bytes( const Elem* first, const Elem* last);
(4)
Effectue large pour multibyte conversion, en utilisant la facette codecvt fourni à la construction .
Original:
Performs wide to multibyte conversion, using the codecvt facet supplied at construction.
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1)
Convertit wchar comme s'il s'agissait d'une chaîne de longueur 1, à byte_string
Original:
Converts wchar as if it was a string of length 1, to byte_string
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2)
Convertit le zéro terminal début large séquence de caractères au caractère large pointé par wptr, à byte_string
Original:
Converts the null-terminated wide character sequence beginning at the wide character pointed to by wptr, to byte_string
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3)
Convertit la chaîne str large pour byte_string .
Original:
Converts the wide string str to byte_string.
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4)
Convertit le caractère large [first, last) séquence à byte_string
Original:
Converts the wide character sequence [first, last) to byte_string
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Dans tous les cas, la conversion commence dans un état de décalage initial, à moins que la non-état initial de départ a été fournie à ce constructeur wstring_convert. Le nombre de caractères convertis et la valeur finale de l'état de conversion sont mémorisés et peuvent être accédés avec state() et 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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Sommaire

[modifier] Retourne la valeur

Un objet byte_string contenant les résultats de la largeur de multibyte conversion. Si la conversion a échoué et il y avait un fourni par l'utilisateur octet d'erreur de chaîne fournie au constructeur de cette wstring_convert, renvoie cette chaîne d'octets d'erreur .
Original:
A byte_string object containing the results of the wide to multibyte conversion. If the conversion failed and there was a user-supplied byte-error string provided to the constructor of this wstring_convert, returns that byte-error string.
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[modifier] Exceptions

Si cet objet wstring_convert a été construit sans fournies par l'utilisateur octet erreur de chaîne, jette std::range_error en cas d'échec de conversion .
Original:
If this wstring_convert object was constructed without a user-supplied byte-error string, throws std::range_error on conversion failure.
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[modifier] Exemple

#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
#include <iomanip>
 
// utility function for output
void hex_print(const std::string& s)
{
    std::cout << std::hex << std::setfill('0');
    for(unsigned char c : s)
        std::cout << std::setw(2) << static_cast<int>(c) << ' ';
    std::cout << std::dec << '\n';
}
 
int main()
{
    // wide character data
    std::wstring wstr =  L"z\u00df\u6c34\U0001d10b"; // or L"zß水𝄋"
 
    // wide to UTF-8
    std::wstring_convert<std::codecvt_utf8<wchar_t>> conv1;
    std::string u8str = conv1.to_bytes(wstr);
    std::cout << "UTF-8 conversion produced " << u8str.size() << " bytes:\n";
    hex_print(u8str);
 
    // wide to UTF-16le
    std::wstring_convert<std::codecvt_utf16<wchar_t, 0x10ffff, std::little_endian>> conv2;
    std::string u16str = conv2.to_bytes(wstr);
    std::cout << "UTF-16le conversion produced " << u16str.size() << " bytes:\n";
    hex_print(u16str);
}

Résultat :

UTF-8 conversion produced 10 bytes:
7a c3 9f e6 b0 b4 f0 9d 84 8b 
UTF-16le conversion produced 10 bytes:
7a 00 df 00 34 6c 34 d8 0b dd

[modifier] Voir aussi

convertit une chaîne d'octets en une chaîne large
Original:
converts a byte string into a wide string
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(fonction membre publique) [edit]
convertit une chaîne large de chaîne de caractères multi-octets étroite, état donné
Original:
converts a wide string to narrow multibyte character string, given state
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(fonction) [edit]
[
virtuel
Original:
virtual
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]
convertit une chaîne de Internt à Externt, comme lors de l'écriture dans un fichier
Original:
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]