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std::basic_istream::read

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< cpp‎ | io‎ | basic istream

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
Original:
Streams
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Abstracciones
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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
Cadena de I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
Original:
Array I/O
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istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
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Types
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streamoff
streamsize
fpos
Error interfaz categoría
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_istream
Los objetos globales
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Global objects
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cin
wcin
Las funciones miembro
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Entrada con formato
Original:
Formatted input
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basic_istream::operator>>
Entrada sin formato
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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
Posicionamiento
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Positioning
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basic_istream::tellg
basic_istream::seekg
Varios
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Clases de miembros
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Member classes
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basic_istream::sentry
Terceros funciones
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Non-member functions
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operator>>(std::basic_istream)
 
basic_istream& read( char_type* s, std::streamsize count );
Extrae caracteres de corriente .
Original:
Extracts characters from stream.
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Se comporta como UnformattedInputFunction. Después de la construcción y comprobación del objeto centinela, extrae los caracteres y los almacena en posiciones sucesivas de la matriz de caracteres cuyo primer elemento es apuntado por s. Los caracteres se extraen y se almacenan hasta que cualquiera de las condiciones siguientes:
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 caracteres se extraen y se almacenan
    Original:
    count characters were extracted and stored
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  • condición de fin de archivo se produce en la secuencia de entrada (en cuyo caso, se llama 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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Contenido

[editar] Parámetros

s -
puntero a la matriz de caracteres para almacenar los caracteres a
Original:
pointer to the character array to store the characters to
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count -
número de caracteres a leer
Original:
number of characters to read
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[editar] Valor de retorno

*this

[editar] Ejemplo

leer () se utiliza a menudo para binarios 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

[editar] Ver también

inserciones de bloques de caracteres
Original:
inserts blocks of characters
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(miembro público of std::basic_ostream función) [edit]
extractos de formato de datos
Original:
extracts formatted data
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(miembro público función) [edit]
extrae los bloques que ya están disponibles los personajes
Original:
extracts already available blocks of characters
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(miembro público función) [edit]
extractos personajes
Original:
extracts characters
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(miembro público función) [edit]
extractos de caracteres hasta el carácter determinado se encuentra
Original:
extracts characters until the given character is found
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(miembro público función) [edit]
lee un archivo
Original:
reads from a file
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(función) [edit]