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Varianti

std::basic_istream::read

Da cppreference.com.
< cpp‎ | io‎ | basic istream

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Gli oggetti globali
Original:
Global objects
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cin
wcin
Membri funzioni
Original:
Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Ingresso formattato
Original:
Formatted input
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basic_istream::operator>>
Ingresso non formattato
Original:
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
Posizionamento
Original:
Positioning
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basic_istream::tellg
basic_istream::seekg
Varie
Original:
Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Membri classi
Original:
Member classes
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basic_istream::sentry
Non membri funzioni
Original:
Non-member functions
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operator>>(std::basic_istream)
 
basic_istream& read( char_type* s, std::streamsize count );
Estrae i caratteri dal flusso.
Original:
Extracts characters from stream.
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Si comporta come UnformattedInputFunction. Dopo la costruzione e la verifica dell'oggetto sentinella, estrae i caratteri e li memorizza in posizioni successive della matrice di caratteri il cui primo elemento è puntato da s. Caratteri vengono estratti e memorizzati fino a qualsiasi delle seguenti condizioni:
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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  • Caratteri count stati estratti e memorizzati
    Original:
    count characters were extracted and stored
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  • condizione di fine file avviene sulla sequenza di ingresso (in questo caso, è chiamato setstate(failbit|eofbit).
    Original:
    end of file condition occurs on the input sequence (in which case, setstate(failbit|eofbit) is called.
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Indice

[modifica] Parametri

s -
puntatore alla matrice di caratteri per memorizzare i caratteri
Original:
pointer to the character array to store the characters to
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count -
numero di caratteri da leggere
Original:
number of characters to read
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[modifica] Valore di ritorno

*this

[modifica] Esempio

read () viene spesso usato per binari 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

[modifica] Vedi anche

blocchi inserti di caratteri
Original:
inserts blocks of characters
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(metodo pubblico) [modifica]
estratti i dati formattati
Original:
extracts formatted data
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(metodo pubblico) [modifica]
estrae blocchi già disponibili di caratteri
Original:
extracts already available blocks of characters
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(metodo pubblico) [modifica]
estratti di caratteri
Original:
extracts characters
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(metodo pubblico) [modifica]
caratteri estratti fino a quando il carattere dato è stato trovato
Original:
extracts characters until the given character is found
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(metodo pubblico) [modifica]
legge da un file
Original:
reads from a file
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(funzione) [modifica]