std::wstring_convert::to_bytes
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<metanoindex/>
<tbody> </tbody>| Déclaré dans l'en-tête <locale>
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byte_string to_bytes( Elem wchar ); |
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byte_string to_bytes( const Elem* wptr ); |
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byte_string to_bytes( const wide_string& wstr ); |
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byte_string to_bytes( const Elem* first, const Elem* last); |
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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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
1)
Convertit
wchar comme s'il s'agissait d'une chaîne de longueur 1, à byte_stringOriginal:
Converts
wchar as if it was a string of length 1, to byte_stringThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
2)
Convertit le zéro terminal début large séquence de caractères au caractère large pointé par
wptr, à byte_stringOriginal:
Converts the null-terminated wide character sequence beginning at the wide character pointed to by
wptr, to byte_stringThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
3)
Convertit la chaîne
str large pour byte_string .Original:
Converts the wide string
str to byte_string.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
4)
Convertit le caractère large
[first, last) séquence à byte_stringOriginal:
Converts the wide character sequence
[first, last) to byte_stringThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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()The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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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
Voir aussi
convertit une chaîne d'octets en une chaîne large Original: converts a byte string into a wide string The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) | |
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) | |
[ virtuel ]Original: virtual The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre virtuelle protégée de std::codecvt)
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