std::codecvt_mode
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<tbody> </tbody>| Dclar dans l'en-tte <locale>
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enum codecvt_mode { consume_header = 4, generate_header = 2, little_endian = 1 }; |
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Les facettes std::codecvt_utf8, std::codecvt_utf16 et std::codecvt_utf8_utf16 accepter une valeur optionnelle de std::codecvt_mode type comme argument de modle, qui spcifie les caractristiques optionnelles de la conversion de la chane unicode .
Original:
The facets std::codecvt_utf8, std::codecvt_utf16, and std::codecvt_utf8_utf16 accept an optional value of type std::codecvt_mode as a template argument, which specifies optional features of the unicode string conversion.
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Constantes
Defined in header
<locale> | |
Valeur
Original: Value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Meaning |
little_endian
|
suppose l'entre est dans l'ordre little-endian (s'applique UTF-16 d'entre uniquement, la valeur par dfaut est big-endian)
Original: assume the input is in little-endian byte order (applies to UTF-16 input only, the default is big-endian) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
consume_header
|
consommer la marque d'ordre d'octet, si elle est prsente au dbut de la squence d'entre, et (dans le cas de l'UTF-16), s'appuient sur l'ordre des octets qu'il spcifie pour dcoder le reste de l'entre
Original: consume the byte order mark, if present at the start of input sequence, and (in case of UTF-16), rely on the byte order it specifies for decoding the rest of the input The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
generate_header
|
fournir en sortie la marque d'ordre d'octets au dbut de la squence de sortie
Original: output the byte order mark at the start of the output sequence The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Les marques d'ordre d'octet reconnus sont les suivants:
Original:
The recognized byte order marks are:
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0xfe 0xff
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UTF-16 big-endian
Original: UTF-16 big-endian The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
0xff 0xfe
|
UTF-16 little-endian
Original: UTF-16 little-endian The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
0xef 0xbb 0xbf
|
UTF-8 (pas d'effet sur boutisme)
Original: UTF-8 (no effect on endianness) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Si std::consume_header n'est pas slectionn lors de la lecture d'un fichier commenant par marque d'ordre d'octet, le caractre Unicode U + FEFF (Zero largeur un espace inscable) sera lu comme premier caractre de la chane content .
Original:
If std::consume_header is not selected when reading a file beginning with byte order mark, the Unicode character U+FEFF (Zero width non-breaking space) will be read as the first character of the string content.
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Exemple
L'exemple suivant illustre la consommation du BOM UTF-8
Original:
The following example demonstrates consuming the UTF-8 BOM
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#include <fstream>
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
// UTF-8 data with BOM
std::ofstream("text.txt") << u8"\ufeffz\u6c34\U0001d10b";
// read the UTF8 file, skipping the BOM
std::wifstream fin("text.txt");
fin.imbue(std::locale(fin.getloc(),
new std::codecvt_utf8<wchar_t, 0x10ffff, std::consume_header>));
for(wchar_t c; fin.get(c); )
std::cout << std::hex << std::showbase << c << '\n';
}
Rsultat :
0x7a
0x6c34
0x1d10b
Voir aussi
convertis entre les codages de caractres, y compris UTF-8, UTF-16, UTF-32 Original: converts between character encodings, including UTF-8, UTF-16, UTF-32 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe gnrique) | |
(C++11) |
convertit entre UTF-8 et UCS2/UCS4 Original: converts between UTF-8 and UCS2/UCS4 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe gnrique) |
(C++11) |
convertit entre UTF-16 et UCS2/UCS4 Original: converts between UTF-16 and UCS2/UCS4 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe gnrique) |
(C++11) |
converts between UTF-8 and UTF-16 (classe gnrique) |