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std::wcstombs

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C++
 
Strings Bibliothek
Null-terminierte Strings
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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
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Wide/multibyte conversions
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mbsinit
Types
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Types
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mbstate_t
 
definiert in Header <cstdlib>
std::size_t wcstombs( char* dst, const wchar_t* src, std::size_t len)
Konvertiert eine Folge von breiten Zeichen aus dem Array, dessen erstes Element wird durch src seiner schmalen Multibyte-Darstellung, die in der ursprünglichen Schaltzustand beginnt hingewiesen. Umgerechnet Zeichen werden in den aufeinander folgenden 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 initial shift state. 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::wctomb umgewandelt, außer dass die wctomb Bekehrung Staat nicht betroffen ist. Die Umwandlung gestoppt, wenn:
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Each character is converted as if by a call to std::wctomb, except that the wctomb's conversion state is unaffected. The conversion stops if:
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  • Das Null-Zeichen wurde umgewandelt und gespeichert .
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    The null character was converted and stored.
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  • A wchar_t wurde festgestellt, dass nicht zu einem gültigen Zeichen in der aktuellen C locale entsprechen .
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    A wchar_t was found that does not correspond to a valid character in the current C locale.
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  • Der nächste Multibyte-Zeichen gespeichert werden übersteigen würde len .
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    The next multibyte character to be stored would exceed len.
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Inhaltsverzeichnis

[Bearbeiten] Notes

Bei den meisten Implementierungen aktualisiert diese Funktion eine globale statische Objekt vom Typ std::mbstate_t wenn es durch die Zeichenfolge verarbeitet, und kann nicht gleichzeitig von zwei Threads aufgerufen werden sollte std::wcsrtombs in solchen Fällen eingesetzt werden .
Original:
In most implementations, this function updates a global static object of type std::mbstate_t as it processes through the string, and cannot be called simultaneously by two threads, std::wcsrtombs should be used in such cases.
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POSIX legt eine gemeinsame Erweiterung: Wenn dst ein NULL-Zeiger ist, gibt diese Funktion die Anzahl der Bytes, die dst geschrieben werden würde, wenn umgewandelt. Ein ähnliches Verhalten ist Standard für std::wcsrtombs .
Original:
POSIX specifies a common extension: if dst is a null pointer, this function returns the number of bytes that would be written to dst, if converted. Similar behavior is standard for std::wcsrtombs.
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[Bearbeiten] Parameter

dst -
Zeiger auf schmalen Zeichen-Array, wo die Multibyte-Zeichen gespeichert werden
Original:
pointer to narrow character array where the multibyte character will be stored
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src -
Zeiger auf das erste Element einer nullterminierten breite String zu konvertieren
Original:
pointer to the first element of a null-terminated wide string to convert
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len -
Anzahl der Byte im Array, auf das dst
Original:
number of byte available in the array pointed to by dst
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[Bearbeiten] 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 .
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.
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Bei der Umwandlung Fehler (wenn ungültige Multibyte-Zeichen angetroffen wurde), gibt static_cast<std::size_t>(-1) .
Original:
On conversion error (if invalid wide character was encountered), returns static_cast<std::size_t>(-1).
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[Bearbeiten] Beispiel

#include <iostream>
#include <clocale>
#include <cstdlib>
 
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𝄋"
    char mbstr[11];
    std::wcstombs(mbstr, wstr, 11);
    std::cout << "multibyte string: " << mbstr << '\n';
}

Output: 

multibyte string: zß水𝄋

[Bearbeiten] Siehe auch
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]
wandelt einen schmalen Multibyte Zeichenkette breite String
Original:
converts a narrow multibyte character string to wide string
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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 wcstombs
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/string/multibyte/wcstombs&oldid=27934“