std::codecvt_mode – cppreference.com

Aus cppreference.com

definiert in Header `<locale>`

`enum codecvt_mode { consume_header = 4, generate_header = 2, little_endian = 1 };`

Die Facetten std::codecvt_utf8, std::codecvt_utf16 und std::codecvt_utf8_utf16 akzeptieren einen optionalen Wert vom Typ std::codecvt_mode als Vorlage Argument, das optionale Merkmale der Unicode-String-Konvertierung gibt .

Original:

The facets std::codecvt_utf8, std::codecvt_utf16, and std::codecvt_utf8_utf16 accept an optional value of type std::codecvt_mode as a template argument, which specifies optional features of the unicode string conversion.

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

Konstanten

definiert in Header `<locale>`

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

`little_endian`	übernehmen die Eingabe im Little-Endian-Byte-Reihenfolge (gilt für UTF-16-Eingang nur die Standard-Big-Endian ist) Original: assume the input is in little-endian byte order (applies to UTF-16 input only, the default is big-endian) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`consume_header`	verbrauchen Bytereihenfolgemarkierung, falls vorhanden zu Beginn Eingabesequenz, und (im Falle von UTF-16), auf dem Byte-Reihenfolge angibt es zum Decodieren der Rest des Eingangs verlassen Original: consume the byte order mark, if present at the start of input sequence, and (in case of UTF-16), rely on the byte order it specifies for decoding the rest of the input The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`generate_header`	Ausgabe der Bytereihenfolgemarkierung am Beginn des Ausgangs-Sequenz Original: output the byte order mark at the start of the output sequence The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Die anerkannten Bytereihenfolgemarkierungen sind:

Original:

The recognized byte order marks are:

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


`0xfe 0xff`	UTF-16 Big-Endian Original: UTF-16 big-endian The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`0xff 0xfe`	UTF-16 Little-Endian Original: UTF-16 little-endian The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

`0xef 0xbb 0xbf`	UTF-8 (keine Auswirkung auf endianness) Original: UTF-8 (no effect on endianness) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Wenn std::consume_header nicht ausgewählt wird, wenn eine Datei lesen, beginnend mit Bytereihenfolgemarkierung wird das Unicode-Zeichen U + FEFF (Zero width non-breaking space) als erstes Zeichen des Strings Inhalte gelesen werden .

Original:

If std::consume_header is not selected when reading a file beginning with byte order mark, the Unicode character U+FEFF (Zero width non-breaking space) will be read as the first character of the string content.

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

Beispiel

Das folgende Beispiel demonstriert verzehrt den UTF-8 BOM

Original:

The following example demonstrates consuming the UTF-8 BOM

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

#include <fstream>
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
    // UTF-8 data with BOM
    std::ofstream("text.txt") << u8"\ufeffz\u6c34\U0001d10b";
    // read the UTF8 file, skipping the BOM
    std::wifstream fin("text.txt");
    fin.imbue(std::locale(fin.getloc(),
                          new std::codecvt_utf8<wchar_t, 0x10ffff, std::consume_header>));
    for(wchar_t c; fin.get(c); )
        std::cout << std::hex << std::showbase << c << '\n';
}

Output:

Siehe auch


codecvt	Konvertiten zwischen Zeichenkodierungen, inklusive UTF-8, UTF-16, UTF-32 Original: converts between character encodings, including UTF-8, UTF-16, UTF-32 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

codecvt_utf8 (C++11)	konvertiert zwischen UTF-8 und UCS2/UCS4 Original: converts between UTF-8 and UCS2/UCS4 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

codecvt_utf16 (C++11)	konvertiert zwischen UTF-16 und UCS2/UCS4 Original: converts between UTF-16 and UCS2/UCS4 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) [edit]

codecvt_utf8_utf16 (C++11)	converts between UTF-8 and UTF-16 (Klassen-Template) [edit]