std::wstring_convert::from_bytes

<metanoindex/>

 

C++

Sprache

Concepts

Utilities-Bibliothek

Strings Bibliothek

Container-Bibliothek

Algorithmen-Bibliothek

Iteratoren Bibliothek

Numerik-Bibliothek

Input / Output-Bibliothek

Lokalisierungen Bibliothek

Reguläre Ausdrücke Bibliothek (C++11)

Atomare Operationen Bibliothek (C++11)

Thread Support-Bibliothek (C++11)

 

Lokalisierungen Bibliothek

Locales und Facetten Original: Locales and facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
locale
use_facet	has_facet
Buchstaben-Klassifikation Original: Character classification The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
isspace isblank (C++11) iscntrl isupper islower isalpha	isdigit ispunct isxdigit isalnum isprint isgraph
Conversions Original: Conversions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
toupper tolower	wstring_convert (C++11) wbuffer_convert (C++11)
Facet Kategorie Basisklassen Original: Facet category base classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype_base codecvt_base messages_base	time_base money_base
Facet Kategorien Original: Facet categories The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype ctype<char> codecvt collate messages time_get time_put	num_get num_put numpunct money_get money_put moneypunct
Locale-spezifische Facetten Original: Locale-specific facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ctype_byname ctype_byname<char> codecvt_byname messages_byname collate_byname	time_get_byname time_put_byname numpunct_byname moneypunct_byname
Code-Konvertierung Facetten Original: Code conversion facets The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
codecvt_utf8 (C++11) codecvt_utf16 (C++11)	codecvt_utf8_utf16 (C++11) codecvt_mode (C++11)
C locale Original: C locale The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setlocale localeconv lconv	LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME

 

std::wstring_convert

Member-Funktionen Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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>
wide_string from_bytes( char byte );	(1)
wide_string from_bytes( const char* ptr );	(2)
wide_string from_bytes( const byte_string& str );	(3)
wide_string from_bytes( const char* first, const char* last);	(4)

Führt Multibyte um Weitwinkel, mit dem codecvt Facette an Ausführung geliefert .

Original:

Performs multibyte to wide conversion, using the codecvt facet supplied at construction.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

1)

byte wandelt, als ob es ein String der Länge 1 um wide_string war

Original:

Converts byte as if it was a string of length 1 to wide_string

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

2)

Konvertiert die nullterminierten Multibyte Reihenfolge beginnend bei dem Charakter, auf den ptr um wide_string

Original:

Converts the null-terminated multibyte character sequence beginning at the character pointed to by ptr to wide_string

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

3)

Konvertiert den schmalen String str um wide_string .

Original:

Converts the narrow string str to wide_string.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

4)

Konvertiert den schmalen Multibyte Zeichenfolge [first, last) um wide_string

Original:

Converts the narrow multibyte character sequence [first, last) to wide_string

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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()

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Rückgabewert

A wide_string Objekt, das die Ergebnisse der Multibyte zum Weitwinkel. Wenn die Konvertierung gescheitert, und es war ein vom Benutzer angegebenen breiten-error-String für den Konstruktor dieses wstring_convert, gibt, dass weite-Fehler-String .

Original:

A wide_string object containing the results of multibyte to wide conversion. If the conversion failed and there was a user-supplied wide-error string provided to the constructor of this wstring_convert, returns that wide-error string.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Ausnahmen

Wenn dies wstring_convert Objekt ohne Benutzer angegebenen breit Fehlerstring gebaut wurde, wirft std::range_error der Umwandlung Fehler .

Original:

If this wstring_convert object was constructed without a user-supplied wide-error string, throws std::range_error on conversion failure.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Beispiel

#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
    std::string utf8 =  u8"z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋"
                        // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b";

    // the UTF-8 / UTF-16 standard conversion facet
    std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> utf16conv;
    std::u16string utf16 = utf16conv.from_bytes(utf8.data());
    std::cout << "UTF16 conversion produced " << utf16.size() << " code points:\n";
    for(char16_t c : utf16)
        std::cout << std::hex << std::showbase << c << '\n';

    // the UTF-8 / UTF-32 standard conversion facet
    std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> utf32conv;
    std::u32string utf32 = utf32conv.from_bytes(utf8);
    std::cout << "UTF32 conversion produced " << std::dec << utf32.size() << " code points:\n";
    for(char32_t c : utf32)
        std::cout << std::hex << std::showbase << c << '\n';
}

Output:

UTF16 conversion produced 5 code points:
0x7a
0xdf
0x6c34
0xd834
0xdd0b
UTF32 conversion produced 4 code points:
0x7a
0xdf
0x6c34
0x1d10b

Siehe auch

to_bytes	wandelt eine breite Folge in ein Byte String Original: converts a wide string into a byte string The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion)
mbsrtowcs	wandelt einen schmalen Multibyte Zeichenkette breite Zeichenfolge mit dem angegebenen Zustand Original: converts a narrow multibyte character string to wide string, given state The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion)
do_in [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtuellen geschützten Member-Funktion of std::codecvt)