Namespace
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
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Astrazioni
Original:
Abstractions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Gli oggetti globali
Original:
Global objects
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
cin
wcin
Membri funzioni
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.
basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Ingresso formattato
Original:
Formatted input
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_istream::operator>>
Ingresso non formattato
Original:
Unformatted input
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_istream::tellg
basic_istream::seekg
Varie
Original:
Miscellaneous
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_istream::sync
basic_istream::swap(C++11)
Membri classi
Original:
Member classes
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_istream::sentry
Non membri funzioni
Original:
Non-member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
operator>>(std::basic_istream)
 
basic_istream& read( char_type* s, std::streamsize count );
Estrae i caratteri dal flusso.
Original:
Extracts characters from stream.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
  • Caratteri count stati estratti e memorizzati
    Original:
    count characters were extracted and stored
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
  • 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.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.

Indice

[modifica] Parametri

s -
puntatore alla matrice di caratteri per memorizzare i caratteri
Original:
pointer to the character array to store the characters to
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
count -
numero di caratteri da leggere
Original:
number of characters to read
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifica] Valore di ritorno

*this

[modifica] Esempio

read () viene spesso usato per binari I / O
Original:
read() is often used for binary I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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

(membro pubblico of std::basic_ostream funzione) [edit]
estratti i dati formattati
Original:
extracts formatted data
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(membro pubblico funzione) [edit]
estrae blocchi già disponibili di caratteri
Original:
extracts already available blocks of characters
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(membro pubblico funzione) [edit]
estratti di caratteri
Original:
extracts characters
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(membro pubblico funzione) [edit]
caratteri estratti fino a quando il carattere dato è stato trovato
Original:
extracts characters until the given character is found
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(membro pubblico funzione) [edit]
legge da un file
Original:
reads from a file
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(funzione) [edit]