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std::mbrtowc

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< cpp‎ | string‎ | multibyte

 
 
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
Original:
Types
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mbstate_t
 
Defined in header <cwchar>
std::size_t mbrtowc( wchar_t* pwc,

                     const char* s,
                     std::size_t n,

                     std::mbstate_t* ps );
Konvertiert einen schmalen Multibyte-Zeichen zu einem breiten Charakter .
Original:
Converts a narrow multibyte character to a wide character.
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Wenn s nicht ein NULL-Zeiger, prüft in den meisten n Bytes des Multibyte-String, beginnend mit dem Byte, auf das s, um die Anzahl von Bytes um den nächsten Multibyte-Zeichen (einschließlich etwaiger Schichtfolgen) vervollständigen bestimmen. Wenn die Funktion bestimmt, dass die nächste Multibyte-Zeichen in s vollständig und gültig ist, wandelt es in der entsprechenden Breitzeichen und speichert sie in *pwc (wenn pwc nicht null ist) .
Original:
If s is not a null pointer, inspects at most n bytes of the multibyte character string, beginning with the byte pointed to by s to determine the number of bytes necessary to complete the next multibyte character (including any shift sequences). If the function determines that the next multibyte character in s is complete and valid, converts it to the corresponding wide character and stores it in *pwc (if pwc is not null).
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Wenn ein Null-Zeiger s ist, die Werte von n und pwc ignoriert und Anruf entspricht std::mbrtowc(NULL, "", 1, ps) .
Original:
If s is a null pointer, the values of n and pwc are ignored and call is equivalent to std::mbrtowc(NULL, "", 1, ps).
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Wenn die weite Zeichen produziert, ist das Null-Zeichen, ist die Umwandlung Staat *ps gespeicherten die ursprüngliche Schaltzustand .
Original:
If the wide character produced is the null character, the conversion state stored in *ps is the initial shift state.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

pwc -
Zeiger auf die Stelle, wo das resultierende breite Zeichen geschrieben werden
Original:
pointer to the location where the resulting wide character will be written
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s -
Zeiger auf die Multibyte Zeichenkette als Eingabe verwendet
Original:
pointer to the multibyte character string used as input
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n -
Grenze für die Anzahl von Bytes in s, die untersucht werden können
Original:
limit on the number of bytes in s that can be examined
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ps -
Zeiger auf die Umwandlung Zustand verwendet bei der Auslegung des Multibyte-String
Original:
pointer to the conversion state used when interpreting the multibyte string
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[Bearbeiten] Rückgabewert

Die erste, die der folgenden gilt:
Original:
The first of the following that applies:
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  • 0 wenn der Charakter von s umgewandelt (und in pwc wenn nicht null) war die Null-Zeichen
    Original:
    0 if the character converted from s (and stored in pwc if non-null) was the null character
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  • die Anzahl der Bytes [1...n] des Multibyte erfolgreich aus s umgewandelt
    Original:
    the number of bytes [1...n] of the multibyte character successfully converted from s
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  • static_cast<std::size_t>(-2) wenn die nächsten n bytes bilden eine unvollständige, aber bisher gültige Multibyte-Zeichens. Nichts wird dem *pwc geschrieben .
    Original:
    static_cast<std::size_t>(-2) if the next n bytes constitute an incomplete, but so far valid, multibyte character. Nothing is written to *pwc.
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  • static_cast<std::size_t>(-1) wenn die Kodierung Fehler auftritt. Nichts zu *pwc geschrieben wird, wird der Wert EILSEQ in errno gespeichert und der Wert *ps undefiniert bleibt .
    Original:
    static_cast<std::size_t>(-1) if encoding error occurs. Nothing is written to *pwc, the value EILSEQ is stored in errno and the value of *ps is left unspecified.
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[Bearbeiten] Beispiel

#include <iostream>
#include <clocale>
#include <cstring>
#include <cwchar>
 
void print_mb(const char* ptr)
{
    std::mbstate_t state = std::mbstate_t(); // initial state
    const char* end = ptr + std::strlen(ptr);
    int len;
    wchar_t wc;
    while((len = std::mbrtowc(&wc, ptr, end-ptr, &state)) > 0) {
        std::wcout << "Next " << len << " bytes are the character " << wc << '\n';
        ptr += len;
    }
}
 
int main()
{
    std::setlocale(LC_ALL, "en_US.utf8");
    // UTF-8 narrow multibyte encoding
    const char* str = u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                      // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";
    print_mb(str);
}

Output:

Next 1 bytes are the character z
Next 2 bytes are the character ß
Next 3 bytes are the character 水
Next 4 bytes are the character 𝄋

[Bearbeiten] 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 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 of std::codecvt) [edit]
C documentation for mbrtowc