Namespace
Varianti

std::feof

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< cpp‎ | io‎ | c

 
 
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
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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
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)
 
C-style I / O
Funzioni
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Functions
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Accesso ai file
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File access
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Diretta input / output
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Direct input/output
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fread
fwrite
Ingresso formattato / uscita
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Unformatted input/output
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Formattato di input / output
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Formatted input/output
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File di posizionamento
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File positioning
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ftell
fgetpos
fseek
fsetpos
rewind
La gestione degli errori
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Error handling
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clearerr
feof
ferror
perror
Le operazioni sui file
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Operations on files
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remove
rename
tmpfile
tmpnam
 
Defined in header <cstdio>
int feof( FILE* stream );
Controlla se la fine del flusso di file specificato è stato raggiunto.
Original:
Checks if the end of the given file stream has been reached.
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Indice

[modifica] Parametri

stream -
il flusso di file da controllare
Original:
the file stream to check
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[modifica] Valore di ritorno

Valore diverso da zero se la fine del flusso è stato raggiunto, altrimenti 0.
Original:
Nonzero value if the end of the stream has been reached, otherwise 0.
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[modifica] Note

Questa funzione riporta solo lo stato corrente come riportato dal più recente I / O, non esamina l'origine dati associata. Ad esempio, se il più recente I / O è un std::fgetc, che restituito l'ultimo byte del file, std::feof restituisce non-zero. Il std::fgetc successivo non riesce e modifica lo stato corrente di fine del file. Solo allora std::feof restituisce 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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Nell'uso tipico, trattamento di flussi di input si ferma in caso di errori, feof e std::ferrror vengono poi utilizzati per distinguere tra diverse condizioni di errore.
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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[modifica] Esempio

[edit]
#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");
}


[modifica] Vedi anche

controlli se end-of-file è stato raggiunto
Original:
checks if end-of-file has been reached
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(membro pubblico of std::basic_ios funzione) [edit]
cancella errori
Original:
clears errors
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(funzione) [edit]
visualizza una stringa di caratteri del corrispondente errore di corrente stderr
Original:
displays a character string corresponding of the current error to stderr
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(funzione) [edit]
assegni per un errore di file
Original:
checks for a file error
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(funzione) [edit]