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    std::wctomb

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    <metanoindex/>

     
    C++
     
    Strings Bibliothek
    Null-terminierte Strings
    Original:
    Null-terminated strings
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    Byte-Strings
    Multibyte-Strings
    Wide Strings
    Classes
    Original:
    Classes
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    basic_string
    char_traits
     
    Nullterminierten Multibyte Strings
    Wide / Multibyte Konvertierungen
    Original:
    Wide/multibyte conversions
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    mbsinit
    Types
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    Types
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    mbstate_t
     
    <tbody> </tbody>
    definiert in Header <cstdlib>
    int wctomb( char *s, wchar_t wc );
    Konvertiert eine breite Charakter wc zur Codierung und speichert sie (einschließlich etwaiger Wechsel-Sequenzen) in der char-Arrays, deren erstes Element wird durch s wies multibyte. Nicht mehr als MB_CUR_MAX Zeichen gespeichert werden .
    Original:
    Converts a wide character wc to multibyte encoding and stores it (including any shift sequences) in the char array whose first element is pointed to by s. No more than MB_CUR_MAX characters are stored.
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    Wenn wc das Nullzeichen ist, wird die Null-Byte, um s geschrieben vorangestellt jegliche Verschiebung notwendigen Sequenzen, um die anfängliche Verschiebung Zustand wiederherzustellen .
    Original:
    If wc is the null character, the null byte is written to s, preceded by any shift sequences necessary to restore the initial shift state.
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    Wenn s ist ein NULL-Zeiger, setzt die globale Umstellung Staat und bestimmt, ob Shift-Sequenzen verwendet werden .
    Original:
    If s is a null pointer, resets the global conversion state and determines whether shift sequences are used.
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    Parameter

    s -
    Zeiger auf den Zeichen-Array für die Ausgabe
    Original:
    pointer to the character array for output
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    wc -
    Breitzeichen zu konvertieren
    Original:
    wide character to convert
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    Rückgabewert

    Wenn s nicht ein NULL-Zeiger, gibt die Anzahl von Bytes, die in der Multibyte-Darstellung von enthaltenen wc oder -1 wenn wc ist kein gültiges Zeichen .
    Original:
    If s is not a null pointer, returns the number of bytes that are contained in the multibyte representation of wc or -1 if wc is not a valid character.
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    Wenn ein Null-Zeiger s ist, setzt seinen internen Zustand Umwandlung, um die anfängliche Schaltzustand und kehrt 0 repräsentieren, wenn die aktuelle Multibyte Codierung nicht zustandsabhängigen (verwendet keine Verschiebung Sequenzen) oder einen von Null verschiedenen Wert, falls der aktuelle Multibyte-Kodierung ist state-abhängige (verwendet Schichtfolgen) .
    Original:
    If s is a null pointer, resets its internal conversion state to represent the initial shift state and returns 0 if the current multibyte encoding is not state-dependent (does not use shift sequences) or a non-zero value if the current multibyte encoding is state-dependent (uses shift sequences).
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    Notes

    Jeder Aufruf wctomb aktualisiert die interne globale Umstellung Zustand (ein statisches Objekt vom Typ std::mbstate_t, nur um diese Funktion bekannt). Wenn die Multibyte-Kodierung verwendet Verschiebung Staaten, ist diese Funktion nicht reentrant. In jedem Fall sollten mehrere Threads nicht nennen wctomb ohne Synchronisation: std::wcrtomb dürfen stattdessen verwendet werden .
    Original:
    Each call to wctomb updates the internal global conversion state (a static object of type std::mbstate_t, only known to this function). If the multibyte encoding uses shift states, this function is not reentrant. In any case, multiple threads should not call wctomb without synchronization: std::wcrtomb may be used instead.
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    Beispiel

    #include <iostream>
#include <clocale>
#include <string>
#include <cstdlib>

void print_wide(const std::wstring& wstr)
{
    bool shifts = std::wctomb(NULL, 0); // reset the conversion state
    std::cout << "shift sequences " << (shifts ? "are" : "not" ) << " used\n";
    for (wchar_t wc : wstr) {
        std::string mb(MB_CUR_MAX, '\0');
        int ret = std::wctomb(&mb[0], wc);
        std::cout << "multibyte char " << mb << " is " << ret << " bytes\n";
    }
}

int main()
{
    std::setlocale(LC_ALL, "en_US.utf8");
    // UTF-8 narrow multibyte encoding
    std::wstring wstr = L"z\u00df\u6c34\U0001d10b"; // or L"zß水𝄋"
    print_wide(wstr);
}

    Output: 

    shift sequences not used
multibyte char z is 1 bytes
multibyte char ß is 2 bytes
multibyte char 水 is 3 bytes
multibyte char 𝄋 is 4 bytes

    Siehe auch
    wandelt die nächsten Multibyte Zeichen-Zeichen
    Original:
    converts the next multibyte character to wide character
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    (Funktion) [edit]
    wandelt eine breite Charakter seiner Multibyte-Darstellung, gegebenen Zustand
    Original:
    converts a wide character to its multibyte representation, 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]
    C documentation for wctomb