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    std::codecvt

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    <metanoindex/>

     
    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
    Original:
    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)
    C locale
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    C locale
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    std::codecvt
     
    <tbody> </tbody>
    definiert in Header <locale>
    template< class InternT, class ExternT, class State > class codecvt;
    Klasse std::codecvt kapselt Umwandlung von Zeichenketten, einschließlich breit und Multibyte aus einer Codierung in eine andere. Alle Datei-I / O-Operationen durchgeführt durch std::basic_fstream<CharT> die std::codecvt<CharT, char, std::mbstate_t> Facette der locale im Strom durchdrungen verwenden .
    Original:
    Class std::codecvt encapsulates conversion of character strings, including wide and multibyte, from one encoding to another. All file I/O operations performed through std::basic_fstream<CharT> use the std::codecvt<CharT, char, std::mbstate_t> facet of the locale imbued in the stream.
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    cpp/locale/codecvt basecpp/locale/locale/facet

    Inheritance diagram

    Vier Spezialisierungen werden durch die Standard-Bibliothek zur Verfügung gestellt und werden von allen locale Objekte in einem C + +-Programm erstellt implementiert:
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    Four specializations are provided by the standard library and are implemented by all locale objects created in a C++ program:
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    definiert in Header <locale>
    std::codecvt<char, char, std::mbstate_t>
    Identitätskonvertierung
    Original:
    identity conversion
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    std::codecvt<char16_t, char, std::mbstate_t>
    Konvertierung zwischen UTF-16 und UTF-8 (seit C++11)
    Original:
    conversion between UTF-16 and UTF-8 (seit C++11)
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    std::codecvt<char32_t, char, std::mbstate_t>
    Konvertierung zwischen UTF-32 und UTF-8 (seit C++11)
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    conversion between UTF-32 and UTF-8 (seit C++11)
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    std::codecvt<wchar_t, char, std::mbstate_t>
    locale-spezifischen Konvertierung zwischen breiten und schmalen String, möglicherweise Multibyte, string
    Original:
    locale-specific conversion between wide string and narrow, possibly multibyte, string
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    Mitglied Typen

    Mitglied Typ
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    Member type
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    		 Definition
    intern_type internT
    extern_type externT
    state_type stateT

    Mitglied widerspricht

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

    Member-Funktionen
    baut eine neue codecvt Facette
    Original:
    constructs a new codecvt facet
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    (öffentliche Elementfunktion)
    zerstört sich eine codecvt Facette
    Original:
    destructs a codecvt facet
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    (geschützt Member-Funktion)
    Beruft do_out
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    invokes do_out
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    (öffentliche Elementfunktion) [edit]
    Beruft do_in
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    invokes do_in
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    (öffentliche Elementfunktion) [edit]
    Beruft do_unshift
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    invokes do_unshift
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    (öffentliche Elementfunktion) [edit]
    Beruft do_encoding
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    invokes do_encoding
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    (öffentliche Elementfunktion) [edit]
    Beruft do_always_noconv
    Original:
    invokes do_always_noconv
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    (öffentliche Elementfunktion) [edit]
    Beruft do_length
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    invokes do_length
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    (öffentliche Elementfunktion) [edit]
    Beruft do_max_length
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    invokes do_max_length
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    (öffentliche Elementfunktion) [edit]

    Geschützt Member-Funktionen

    [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) [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) [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) [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) [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) [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) [edit]
    [virtuell]
    gibt die maximale Anzahl von externT Zeichen, die in einem einzigen Internt Zeichen umgewandelt werden konnte
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    returns the maximum number of externT characters that could be converted into a single internT character
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    (virtuellen geschützten Member-Funktion) [edit]

    Inherited from std::codecvt_base

    Mitglied Typ
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    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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    Beispiel

    Die folgenden Beispiele liest einen UTF-8-Datei mit einem Locale, das UTF-8-Konvertierung implementiert in codecvt <wchar_t, char, mbstate_t>
    Original:
    The following examples reads a UTF-8 file using a locale which implements UTF-8 conversion in codecvt<wchar_t, char, mbstate_t>
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    #include <iostream>
#include <fstream>
#include <string>
#include <locale>
#include <iomanip>
int main()
{
    // UTF-8 narrow multibyte encoding
    std::ofstream("text.txt") << u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                                           // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
    std::wifstream fin("text.txt");
    fin.imbue(std::locale("en_US.UTF-8")); // this locale's codecvt<wchar_t, char, mbstate_t>
                                           // converts UTF-8 to UCS4
    std::cout << "The UTF-8 file contains the following wide characters: \n";
    for(wchar_t c; fin >> c; )
        std::cout << "U+" << std::hex << std::setw(4) << std::setfill('0') << c << '\n';
}

    Output: 

    The UTF-8 file contains the following wide characters:
U+007a
U+00df
U+6c34
U+1d10b

    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
    definiert Charakter Konvertierungsfehler
    Original:
    defines character conversion errors
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    (Klassen-Template)
    schafft eine codecvt Facette für die benannte locale
    Original:
    creates a codecvt facet for the named locale
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    (Klassen-Template)
    (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
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    converts between UTF-16 and UCS2/UCS4
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    (Klassen-Template) [edit]
    (C++11)
    		 converts between UTF-8 and UTF-16
    (Klassen-Template) [edit]