Namespace
Varianti

std::ferror

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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
Original:
Functions
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Accesso ai file
Original:
File access
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Diretta input / output
Original:
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
Original:
Error handling
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clearerr
feof
ferror
perror
Le operazioni sui file
Original:
Operations on files
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remove
rename
tmpfile
tmpnam
 
Elemento definito nell'header <cstdio>
int ferror( FILE *stream );
Controlla il flusso di dati per gli errori.
Original:
Checks the given stream for errors.
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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 il flusso di file è si sono verificati errori, ​0​ altrimenti
Original:
Nonzero value if the file stream has errors occurred, ​0​ otherwise
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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
cancella errori
Original:
clears errors
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(funzione) [modifica]
controlli per la fine del file
Original:
checks for the end-of-file
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(funzione) [modifica]
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) [modifica]
C documentation for ferror
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/io/c/ferror&oldid=25763"