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    std::wcsrtombs

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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
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    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 <cwchar>
    std::size_t wcsrtombs( char* dst, const wchar_t** src, std::size_t len, std::mbstate_t* ps );
    Konvertiert eine Folge von breiten Zeichen aus dem Array, dessen erstes Element ist, um durch *src seiner schmalen Multibyte-Darstellung die in der Konvertierung Zustand durch *ps beschrieben beginnt hingewiesen. Wenn dst nicht null ist, umgewandelt werden Zeichen in den aufeinanderfolgenden Elementen der char Array, auf das dst gespeichert. Nicht mehr als len Bytes an das Ziel-Array geschrieben .
    Original:
    Converts a sequence of wide characters from the array whose first element is pointed to by *src to its narrow multibyte representation that begins in the conversion state described by *ps. If dst is not null, converted characters are stored in the successive elements of the char array pointed to by dst. No more than len bytes are written to the destination array.
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    Jedes Zeichen wird, als ob durch einen Aufruf std::wcrtomb umgewandelt. Die Umwandlung gestoppt, wenn:
    Original:
    Each character is converted as if by a call to std::wcrtomb. The conversion stops if:
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    • Das Null-Zeichen wurde umgewandelt und gespeichert. src eingestellt ist NULL und *ps stellt den ersten Schaltzustand .
      Original:
      The null character was converted and stored. src is set to NULL and *ps represents the initial shift state.
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    • A wchar_t wurde festgestellt, dass nicht zu einem gültigen Zeichen in der aktuellen C locale entsprechen. src soll bei der ersten umgesetzten breite Zeichen zeigen .
      Original:
      A wchar_t was found that does not correspond to a valid character in the current C locale. src is set to point at the first unconverted wide character.
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    • die nächste Multibyte-Zeichen gespeichert werden übersteigen würde len. src soll bei der ersten umgesetzten breite Zeichen zeigen. Dieser Zustand wird nicht geprüft, ob dst==NULL .
      Original:
      the next multibyte character to be stored would exceed len. src is set to point at the first unconverted wide character. This condition is not checked if dst==NULL.
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    Parameter

    dst -
    Zeiger auf schmalen Zeichen-Array, wo die Multibyte-Zeichen gespeichert werden
    Original:
    pointer to narrow character array where the multibyte characters will be stored
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    src -
    Zeiger auf Zeiger auf das erste Element einer nullterminierten breite String
    Original:
    pointer to pointer to the first element of a null-terminated wide string
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    len -
    Anzahl der verfügbaren Bytes im Array, auf das dst
    Original:
    number of bytes available in the array pointed to by dst
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    ps -
    Zeiger auf die Umwandlung Zustand Objekt
    Original:
    pointer to the conversion state object
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    Rückgabewert

    Bei Erfolg gibt die Anzahl der Bytes (einschließlich etwaiger Schichtfolgen, aber ohne das abschließende '\0') geschrieben, um die Zeichen-Array, dessen erstes Element wird durch dst hingewiesen. Wenn dst==NULL, gibt die Anzahl von Bytes, die geschrieben worden wäre .
    Original:
    On success, returns the number of bytes (including any shift sequences, but excluding the terminating '\0') written to the character array whose first element is pointed to by dst. If dst==NULL, returns the number of bytes that would have been written.
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    Bei der Umwandlung Fehler (wenn ungültige Multibyte-Zeichen angetroffen wurde), kehrt static_cast<std::size_t>(-1), speichert EILSEQ in errno und verlässt *ps in unbestimmten Zustand .
    Original:
    On conversion error (if invalid wide character was encountered), returns static_cast<std::size_t>(-1), stores EILSEQ in errno, and leaves *ps in unspecified state.
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    Beispiel

    #include <iostream>
#include <vector>
#include <clocale>
#include <string>
#include <cwchar>

void print_wide(const wchar_t* wstr)
{
    std::mbstate_t state = std::mbstate_t();
    int len = 1 + std::wcsrtombs(NULL, &wstr, 0, &state);
    std::vector<char> mbstr(len);
    std::wcsrtombs(&mbstr[0], &wstr, mbstr.size(), &state);
    std::cout << "multibyte string: " << &mbstr[0] << '\n'
              << "Length, including '\\0': " << mbstr.size() << '\n';
}

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

    Output: 

    multibyte string: zß水𝄋
Length, including '\0': 11

    Siehe auch
    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]
    wandelt einen schmalen Multibyte Zeichenkette breite Zeichenfolge mit dem angegebenen Zustand
    Original:
    converts a narrow multibyte character string to wide 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]
    C documentation for wcsrtombs