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    std::wstring_convert::to_bytes

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    <metanoindex/>

     
    C++
     
    Lokalisierungen Bibliothek
    Locales und Facetten
    Original:
    Locales and facets
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    locale
    Buchstaben-Klassifikation
    Original:
    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::wstring_convert
    Member-Funktionen
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    Member functions
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    wstring_convert::wstring_convert
    wstring_convert::~wstring_convert
    wstring_convert::from_bytes
    wstring_convert::to_bytes
    wstring_convert::converted
    wstring_convert::state
     
    <tbody> </tbody>
    definiert in Header <locale>
    byte_string to_bytes( Elem wchar );
    		 (1)
    byte_string to_bytes( const Elem* wptr );
    		 (2)
    byte_string to_bytes( const wide_string& wstr );
    		 (3)
    byte_string to_bytes( const Elem* first, const Elem* last);
    		 (4)
    Führt breite Konvertierung multibyte mit dem codecvt Facette an Ausführung geliefert .
    Original:
    Performs wide to multibyte conversion, using the codecvt facet supplied at construction.
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    1)

    wchar wandelt, als ob es ein String der Länge 1, um byte_string war
    Original:
    Converts wchar as if it was a string of length 1, to byte_string
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    2)

    Konvertiert die nullterminierten Breitzeichen Reihenfolge beginnend bei der Wide-Character, auf die wptr, um byte_string
    Original:
    Converts the null-terminated wide character sequence beginning at the wide character pointed to by wptr, to byte_string
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    3)

    Konvertiert die breite String str um byte_string .
    Original:
    Converts the wide string str to byte_string.
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    4)

    Konvertiert die breite Zeichenfolge [first, last) um byte_string
    Original:
    Converts the wide character sequence [first, last) to byte_string
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    In allen Fällen beginnt die Umwandlung in ersten Schaltzustand, sofern nicht anfänglichen Startzustand zu dieser wstring_convert Konstruktor bereitgestellt. Die Anzahl der Zeichen umgewandelt und der Endwert der Konvertierungsstatus werden gespeichert und können mit state() und converted() genutzt werden
    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()
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    Rückgabewert

    A byte_string Objekt, das die Ergebnisse der breiten Konvertierung multibyte. Wenn die Konvertierung gescheitert, und es war eine vom Benutzer angegebene Byte-Fehler-String für den Konstruktor dieses wstring_convert, gibt dieses Byte-Fehler-String .
    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.
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    Ausnahmen

    Wenn dies wstring_convert Objekt ohne vom Benutzer angegebenen Byte-Fehler-String konstruiert wurde, wirft std::range_error der Umwandlung Fehler .
    Original:
    If this wstring_convert object was constructed without a user-supplied byte-error string, throws std::range_error on conversion failure.
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    Beispiel

    #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

    Siehe auch
    wandelt ein Byte-String in einem breiten String
    Original:
    converts a byte string into a wide string
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    (öffentliche Elementfunktion) [edit]
    wandelt eine breite Zeichenfolge in schmale Multibyte Zeichenkette gegebenen Zustand
    Original:
    converts a wide string to narrow multibyte character string, given state
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    (Funktion) [edit]
    [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]