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std::codecvt_utf8_utf16

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C++
 
Lokalisierungen Bibliothek
Locales und Facetten
Original:
Locales and facets
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locale
Buchstaben-Klassifikation
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Character classification
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Conversions
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Conversions
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Facet Kategorie Basisklassen
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Facet category base classes
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Facet Kategorien
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Facet categories
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Locale-spezifische Facetten
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Locale-specific facets
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Code-Konvertierung Facetten
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Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
codecvt_utf8_utf16(C++11)
codecvt_mode(C++11)
C locale
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C locale
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definiert in Header <codecvt>
template< class Elem,

          unsigned long Maxcode = 0x10ffff,
          std::codecvt_mode Mode = (std::codecvt_mode)0 >

class codecvt_utf8_utf16 : public std::codecvt<Elem, char, std::mbstate_t>;
std::codecvt_utf8_utf16 ist ein std::codecvt Facette, die Konvertierung zwischen einer UTF-8-codierte Bytefolge und UTF-16-codierte Zeichenfolge kapselt Wenn Elem eine 32 ist... - Bit-Typ, wird ein UTF-16 Codepunkt in jedem 32-Bit-Zeichen des Ausgangs Sequenz gespeichert werden. Diese codecvt Facette verwendet werden, um Lese-und Schreib UTF-8-Dateien, sowohl Text und binäre .
Original:
std::codecvt_utf8_utf16 is a std::codecvt facet which encapsulates conversion between a UTF-8 encoded byte string and UTF-16 encoded character string. If Elem is a 32-bit type, one UTF-16 codepoint will be stored in each 32-bit character of the output sequence. This codecvt facet can be used to read and write UTF-8 files, both text and binary.
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Inhaltsverzeichnis

[Bearbeiten] Template-Parameter

Elem -
entweder char16_t, char32_t oder wchar_t
Original:
either char16_t, char32_t, or wchar_t
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Maxcode -
der größte Wert von Elem daß diese Facette liest oder ohne Fehler zu schreiben
Original:
the largest value of Elem that this facet will read or write without error
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Mode -
eine Konstante vom Typ std::codecvt_mode
Original:
a constant of type std::codecvt_mode
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Inherited from std::codecvt

Member types

Mitglied Typ
Original:
Member type
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 Definition
intern_type internT
extern_type externT
state_type stateT

Member objects

Member name
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Member name
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 Type
id (statisch) std::locale::id

Member functions
Beruft do_out
Original:
invokes do_out
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_in
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invokes do_in
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_unshift
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invokes do_unshift
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_encoding
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invokes do_encoding
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_always_noconv
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invokes do_always_noconv
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_length
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invokes do_length
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(öffentliche Elementfunktion of std::codecvt) [edit]
Beruft do_max_length
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invokes do_max_length
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(öffentliche Elementfunktion of std::codecvt) [edit]

Protected member functions

[virtuell]
wandelt eine Zeichenkette aus Internt zu externT, wie beim Schreiben in eine Datei
Original:
converts a string from internT to externT, such as when writing to file
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
wandelt eine Zeichenkette aus externT um Internt wie beim Lesen aus Datei
Original:
converts a string from externT to internT, such as when reading from file
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
generiert die Beendigung Ziffernfolge externT Zeichen für unvollständige Umsetzung
Original:
generates the termination character sequence of externT characters for incomplete conversion
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
gibt die Anzahl der externT Zeichen notwendig, um ein Internt Charakter zu produzieren, wenn konstant
Original:
returns the number of externT characters necessary to produce one internT character, if constant
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
testet, ob der Facette kodiert eine Identität Konvertierung für alle gültiges Argument Werte
Original:
tests if the facet encodes an identity conversion for all valid argument values
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
berechnet die Länge der Zeichenfolge, externT durch Umwandlung in gegebenen Internt Puffer verbraucht würde
Original:
calculates the length of the externT string that would be consumed by conversion into given internT buffer
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]
[virtuell]
gibt die maximale Anzahl von externT Zeichen, die in einem einzigen Internt Zeichen umgewandelt werden konnte
Original:
returns the maximum number of externT characters that could be converted into a single internT character
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(virtuellen geschützten Member-Funktion of std::codecvt) [edit]


Inherited from std::codecvt_base

Mitglied Typ
Original:
Member type
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 Definition
enum result { ok, partial, error, noconv };
Ohne Bereichseinschränkung Aufzählungstyp
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Unscoped enumeration type
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Enumeration konstant
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Enumeration constant
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 Definition
ok
Umwandlung wurde ohne Fehler beendet
Original:
conversion was completed with no error
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partial
nicht alle Quellzeichen umgewandelt wurden
Original:
not all source characters were converted
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error
hat eine ungültige Zeichen
Original:
encountered an invalid character
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noconv
kein Umbau erforderlich, Eingabe und Ausgabe-Typen sind die gleichen
Original:
no conversion required, input and output types are the same
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[Bearbeiten] Beispiel

Das folgende Beispiel zeigt das Lesen eines UTF -8 Datei in eine UTF-16-String auf einem System mit 32-Bit-wchar_t
Original:
The following example demonstrates reading a UTF-8 file into a UTF-16 string on a system with 32-bit wchar_t
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#include <fstream>
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
    std::ofstream("text.txt") << u8"z\u6c34\U0001d10b";
 
    std::wifstream file1("text.txt");
    file1.imbue(std::locale("en_US.UTF8"));
    std::cout << "Normal read from file (using default UTF-8/UTF-32 codecvt)\n";
    for(wchar_t c; file1 >> c; )
        std::cout << std::hex << std::showbase << c << '\n';
 
    std::wifstream file2("text.txt");
    file2.imbue(std::locale(file2.getloc(), new std::codecvt_utf8_utf16<wchar_t>));
    std::cout << "UTF-16 read from the same file (using codecvt_utf8_utf16)\n";
    for(wchar_t c; file2 >> c; )
        std::cout << std::hex << std::showbase << c << '\n';
}

Output: 

Normal read from file (using default UTF-8/UTF-32 codecvt)
0x7a
0x6c34
0x1d10b
UTF-16 read from the same file (using codecvt_utf8_utf16)
0x7a
0x6c34
0xd834
0xdd0b

[Bearbeiten] Siehe auch

Character
conversions 		narrow multibyte
(char) 		UTF-8
(char) 		UTF-16
(char16_t)
UTF-16 mbrtoc16 / c16rtomb codecvt<char16_t, char, mbstate_t>
codecvt_utf8_utf16<char16_t>
codecvt_utf8_utf16<char32_t>
codecvt_utf8_utf16<wchar_t> 		N/A
UCS2 No codecvt_utf8<char16_t> codecvt_utf16<char16_t>
UTF-32/UCS4
(char32_t) 		mbrtoc32 / c32rtomb codecvt<char32_t, char, mbstate_t>
codecvt_utf8<char32_t> 		codecvt_utf16<char32_t>
UCS2/UCS4
(wchar_t) 		No codecvt_utf8<wchar_t> codecvt_utf16<wchar_t>
wide
(wchar_t) 		codecvt<wchar_t, char, mbstate_t>
mbsrtowcs / wcsrtombs 		No No
Konvertiten zwischen Zeichenkodierungen, inklusive UTF-8, UTF-16, UTF-32
Original:
converts between character encodings, including UTF-8, UTF-16, UTF-32
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(Klassen-Template) [edit]
(C++11)
Tags zu ändern, das Verhalten der Standard-codecvt Facetten
Original:
tags to alter behavior of the standard codecvt facets
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(Klasse) [edit]
(C++11)
konvertiert zwischen UTF-8 und UCS2/UCS4
Original:
converts between UTF-8 and UCS2/UCS4
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(Klassen-Template) [edit]
(C++11)
konvertiert zwischen UTF-16 und UCS2/UCS4
Original:
converts between UTF-16 and UCS2/UCS4
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(Klassen-Template) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/locale/codecvt_utf8_utf16&oldid=27144“