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std::feof

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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)
 
C estilo de I / O
Funções
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Functions
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Arquivo de acesso
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File access
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Directa de entrada / saída
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Direct input/output
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Não formatado entrada / saída
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Unformatted input/output
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Formatado de entrada / saída
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Formatted input/output
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Arquivo de posicionamento
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File positioning
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De tratamento de erros
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Error handling
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feof
Operações em arquivos
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Operations on files
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Definido no cabeçalho <cstdio>
int feof( FILE* stream );
Verifica se o fim do fluxo determinado arquivo foi atingido.
Original:
Checks if the end of the given file stream has been reached.
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Índice

[editar] Parâmetros

stream -
o fluxo de arquivo para verificar
Original:
the file stream to check
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[editar] Valor de retorno

Valor diferente de zero se o fim do fluxo foi atingido, de outro modo.. ​0​
Original:
Nonzero value if the end of the stream has been reached, otherwise ​0​.
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[editar] Notas

Esta função só informa o estado de fluxo, conforme relatado pelo mais recente operação I / O, que não examina a fonte de dados associado. Por exemplo, se o que eu mais recentes / O foi um std::fgetc, que retornou o último byte de um arquivo, std::feof retorna não-zero. O std::fgetc próxima falha e muda o estado de fluxo para' fim-de-arquivo. Só então std::feof retorna zero.
Original:
This function only reports the stream state as reported by the most recent I/O operation, it does not examine the associated data source. For example, if the most recent I/O was a std::fgetc, which returned the last byte of a file, std::feof returns non-zero. The next std::fgetc fails and changes the stream state to end-of-file. Only then std::feof returns zero.
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Em utilização normal, o processamento pára no fluxo de entrada de qualquer erro, e feof std::ferrror são então utilizados para distinguir entre as condições de erro diferentes.
Original:
In typical usage, input stream processing stops on any error; feof and std::ferrror are then used to distinguish between different error conditions.
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[editar] Exemplo

#include <cstdio>
#include <cstdlib>
 
int main()
{
    FILE* fp = std::fopen("test.txt", "r");
    if(!fp) {
        std::perror("File opening failed");
        return EXIT_FAILURE;
    }
 
    int c; // note: int, not char, required to handle EOF
    while ((c = std::fgetc(fp)) != EOF) { // standard C I/O file reading loop
       std::putchar(c);
    }
 
    if (std::ferror(fp))
        std::puts("I/O error when reading");
    else if (std::feof(fp))
        std::puts("End of file reached successfully");
}


[editar] Veja também
verifica se fim-de-arquivo foi atingido
Original:
checks if end-of-file has been reached
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(of std::basic_ios função pública membro) [edit]
elimina erros
Original:
clears errors
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(função) [edit]
exibe uma seqüência de caracteres correspondente do erro atual para stderr
Original:
displays a character string corresponding of the current error to stderr
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(função) [edit]
verifica um erro de arquivo
Original:
checks for a file error
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(função) [edit]
Documentação C para feof
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