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      std::basic_istream::read

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      <metanoindex/>

       
      C++
       
      De entrada / saída da biblioteca
      I / O manipuladores
      C estilo de I / O
      Buffers
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      Buffers
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      (obsoleta)
      Streams
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      Streams
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      Abstrações
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      Abstractions
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      File I / O
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      File I/O
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      Cordas I / O
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      String I/O
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      Matriz de I / O
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      Array I/O
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      (obsoleta)
      (obsoleta)
      (obsoleta)
      Tipos
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      Types
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      Interface de categoria de erro
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      Error category interface
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      (C++11)
      (C++11)
       
      std::basic_istream
      Objetos globais
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      Global objects
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      Funções de membro
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      Member functions
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      basic_istream::basic_istream
      basic_istream::~basic_istream
      basic_istream::operator=(C++11)
      Entrada formatada
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      Formatted input
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      basic_istream::operator>>
      Entrada não formatado
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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
      Posicionamento
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      Positioning
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      basic_istream::tellg
      basic_istream::seekg
      Diversos
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      Miscellaneous
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      basic_istream::sync
      basic_istream::swap(C++11)
      Aulas-Membros
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      Member classes
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      basic_istream::sentry
      Não-membros funções
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      Non-member functions
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      <tbody> </tbody>
      basic_istream& read( char_type* s, std::streamsize count );
      Extrai personagens de fluxo.
      Original:
      Extracts characters from stream.
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      Se comporta como UnformattedInputFunction. Depois de construir e verificar o objeto de sentinela, extrai os caracteres e armazena-os em locais sucessivos da matriz de caracteres cujo primeiro elemento é apontado por s. Os caracteres são extraídos e armazenados até qualquer uma das seguintes condições ocorre:
      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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      • Caracteres count foram extraídos e armazenados
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        count characters were extracted and stored
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      • condição de fim de arquivo ocorre na sequência de entrada (em cujo caso, é chamado 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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      Parâmetros

      s -
      ponteiro para a matriz de caracteres para armazenar os personagens
      Original:
      pointer to the character array to store the characters to
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      count -
      número de caracteres para ler
      Original:
      number of characters to read
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      Valor de retorno

      *this

      Exemplo

      read () é usado frequentemente para binário 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';
}

      Saída: 

      0x12121212

      Veja também
      insere blocos de caracteres
      Original:
      inserts blocks of characters
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      (of std::basic_ostream função pública membro) [edit]
      extratos dados formatados
      Original:
      extracts formatted data
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      (função pública membro) [edit]
      extrai blocos já disponíveis de caracteres
      Original:
      extracts already available blocks of characters
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      (função pública membro) [edit]
      extratos personagens
      Original:
      extracts characters
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      (função pública membro) [edit]
      extratos de caracteres até o caráter dado foi encontrado
      Original:
      extracts characters until the given character is found
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      (função pública membro) [edit]
      lê um arquivo
      Original:
      reads from a file
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      (função) [edit]