std::wstring_convert::to_bytes
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<metanoindex/>
<tbody> </tbody>| Elemento definito nell'header <locale>
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byte_string to_bytes( Elem wchar ); |
(1) | |
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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Esegue bersaglio multibyte di conversione, con la faccetta
codecvt alimentato a costruzione.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)
Converte
wchar come se fosse una stringa di lunghezza 1, a 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)
Converte il null-terminated gamma inizio sequenza di caratteri in caratteri estesi puntato da
wptr, a 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)
Converte la stringa da
str ampia 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)
Converte l'ampio
[first, last) sequenza di caratteri a 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.
In tutti i casi, la conversione inizia in stato di spostamento iniziale, a meno che non stato iniziale di partenza è stato fornito a questo costruttore
wstring_convert. Il numero di caratteri convertiti e il valore finale dello stato di conversione sono ricordati e si può accedere con state() e 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.
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.
Valore di ritorno
Un oggetto
byte_string contenente i risultati del bersaglio multibyte conversione. Se la conversione non è riuscita e si è fornita dall'utente byte stringa di errore fornito al costruttore di questo wstring_convert, restituisce quel byte-stringa di errore.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.
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.
Eccezioni
Se questo oggetto
wstring_convert è stato costruito senza fornito dall'utente byte stringa di errore, getta std::range_error in caso di fallimento di conversione.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.
You can help to correct and verify the translation. Click here for instructions.
Esempio
#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);
}
Output:
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
Vedi anche
converte una stringa di byte in una stringa di larghezza 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. (metodo pubblico) | |
converte una stringa larga a stretta stringa a caratteri multibyte, determinato stato 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. (funzione) | |
[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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtuale protetto funzione of std::codecvt membro)
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