std::wstring_convert::from_bytes
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wide_string from_bytes( char byte ); |
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wide_string from_bytes( const char* ptr ); |
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wide_string from_bytes( const byte_string& str ); |
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wide_string from_bytes( const char* first, const char* last); |
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Effectue la conversion multi-octets de large, en utilisant la facette codecvt fourni la construction .
Original:
Performs multibyte to wide conversion, using the codecvt facet supplied at construction.
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1)
Convertit
byte comme s'il s'agissait d'une chane de longueur 1 wide_stringOriginal:
Converts
byte as if it was a string of length 1 to wide_stringThe text has been machine-translated via Google Translate.
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2)
Convertit le dbut termine par NULL squence de caractres multi-octets en caractres pointe par
ptr wide_stringOriginal:
Converts the null-terminated multibyte character sequence beginning at the character pointed to by
ptr to wide_stringThe 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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3)
Convertit la chane
str troite pour wide_string .Original:
Converts the narrow string
str to wide_string.The text has been machine-translated via Google Translate.
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4)
Convertit le
[first, last) multi-octets troite squence de caractres wide_stringOriginal:
Converts the narrow multibyte character sequence
[first, last) to wide_stringThe text has been machine-translated via Google Translate.
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Dans tous les cas, la conversion commence dans un tat de dcalage initial, moins que la non-tat initial de dpart a t fournie ce constructeur
wstring_convert. Le nombre de caractres convertis et la valeur finale de l'tat de conversion sont mmoriss et peuvent tre accds 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
wide_string contenant les rsultats de la conversion multi-octets de large. Si la conversion a chou et il y avait un fourni par l'utilisateur grand erreur de chane fourni au constructeur de cette wstring_convert, renvoie cette grande erreur de chane .Original:
A
wide_string object containing the results of multibyte to wide conversion. If the conversion failed and there was a user-supplied wide-error string provided to the constructor of this wstring_convert, returns that wide-error string.The text has been machine-translated via Google Translate.
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Exceptions
Si cet objet
wstring_convert a t construit sans fournie par l'utilisateur large erreur de chane, jette std::range_error en cas d'chec de conversion .Original:
If this
wstring_convert object was constructed without a user-supplied wide-error string, throws std::range_error on conversion failure.The text has been machine-translated via Google Translate.
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Exemple
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
std::string utf8 = u8"z\u00df\u6c34\U0001d10b"; // or u8"z"
// or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
// the UTF-8 / UTF-16 standard conversion facet
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> utf16conv;
std::u16string utf16 = utf16conv.from_bytes(utf8.data());
std::cout << "UTF16 conversion produced " << utf16.size() << " code points:\n";
for(char16_t c : utf16)
std::cout << std::hex << std::showbase << c << '\n';
// the UTF-8 / UTF-32 standard conversion facet
std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> utf32conv;
std::u32string utf32 = utf32conv.from_bytes(utf8);
std::cout << "UTF32 conversion produced " << std::dec << utf32.size() << " code points:\n";
for(char32_t c : utf32)
std::cout << std::hex << std::showbase << c << '\n';
}
Rsultat :
UTF16 conversion produced 5 code points:
0x7a
0xdf
0x6c34
0xd834
0xdd0b
UTF32 conversion produced 4 code points:
0x7a
0xdf
0x6c34
0x1d10b
Voir aussi
convertit une chane de large dans une chane d'octets Original: converts a wide string into a byte 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 chane de caractres multi-octets en une chane de caractre troit de large, tat donn Original: converts a narrow multibyte character string to wide 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 chane de Externt internt, comme lors de la lecture du fichier Original: converts a string from externT to internT, such as when reading from 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 protge de std::codecvt)
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