std::basic_istream::read – cppreference.com

std::basic_istream::read

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C++
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
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Streams
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Abstraktionen
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
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Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Globale Objekte
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Global objects
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cin
wcin
Member-Funktionen
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Formatierte Eingabe
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Formatted input
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basic_istream::operator>>
Unformatierte Eingabe
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Unformatted input
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basic_istream::get
basic_istream::peek
basic_istream::unget
basic_istream::putback
basic_istream::getline
basic_istream::ignore
basic_istream::read
basic_istream::readsome
basic_istream::gcount
Positionierung
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Positioning
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basic_istream::tellg
basic_istream::seekg
Verschiedenes
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Mitglied Klassen
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Member classes
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basic_istream::sentry
Non-Member-Funktionen
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Non-member functions
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operator>>(std::basic_istream)
 
<tbody> </tbody>
basic_istream& read( char_type* s, std::streamsize count );
Extrahiert Zeichen von stream .
Original:
Extracts characters from stream.
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Verhält sich wie UnformattedInputFunction. Nach dem Bau und Prüfung der Schildwache Objekts, extrahiert Zeichen und speichert sie in aufeinander folgenden Aufenthaltsorten der Zeichen-Array, dessen erstes Element wird durch s hingewiesen. Zeichen werden extrahiert und gespeichert werden, bis eine der folgenden Bedingungen auftritt:
Original:
Behaves as UnformattedInputFunction. After constructing and checking the sentry object, extracts characters and stores them into successive locations of the character array whose first element is pointed to by s. Characters are extracted and stored until any of the following conditions occurs:
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  • count Zeichen wurden extrahiert und gespeichert
    Original:
    count characters were extracted and stored
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  • Fileende Bedingung tritt auf der Eingabesequenz (in welchem ​​Fall setstate(failbit|eofbit) genannt .
    Original:
    end of file condition occurs on the input sequence (in which case, setstate(failbit|eofbit) is called.
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Parameter

s -
Zeiger auf den Zeichen-Array, um die Zeichen zu speichern
Original:
pointer to the character array to store the characters to
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count -
Zahl der zu lesenden Zeichen
Original:
number of characters to read
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Rückgabewert

*this

Beispiel

read () wird oft für binäre verwendeten I / O
Original:
read() is often used for binary I/O
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#include <iostream>
#include <string>
#include <sstream>
#include <cstdint>
int main()
{
    std::string bin = {'\x12', '\x12', '\x12', '\x12'};
    std::istringstream raw(bin);
    std::uint32_t n;
    raw.read(reinterpret_cast<char*>(&n), 4);
    std::cout << std::hex << std::showbase << n << '\n';
}

Output: 

0x12121212

Siehe auch

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