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std::feof — cppreference.com

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Déclaré dans l'en-tête `<cstdio>`
`int feof( FILE* stream );`

Vérifie si la fin du flux de fichier donné a été atteint .

Original:

Checks if the end of the given file stream has been reached.

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Paramètres

stream

-

le flux de fichier à vérifier

Original:

the file stream to check

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Retourne la valeur

Valeur différente de zéro si la fin du flux a été atteinte, sinon 0 .

Original:

Nonzero value if the end of the stream has been reached, otherwise 0.

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Notes

Cette fonction signale que l'état courant tel que rapporté par la plus récente opération E / S, il n'examine pas la source de données associée. Par exemple, si la plus récente d'E / S a été un std::fgetc, qui a retourné le dernier octet d'un fichier, std::feof renvoie une valeur non nulle. Le std::fgetc suivante échoue et modifie l'état de flux de fin-de-fichier. C'est alors seulement std::feof retourne zéro .

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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En utilisation normale, le traitement des flux d'entrée s'arrête sur une erreur; feof et std::ferrror sont ensuite utilisés pour distinguer entre les différentes conditions d'erreur .

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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Exemple

#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");
}

Voir aussi


eof	vérifie si fin de fichier a été atteinte Original: checks if end-of-file has been reached The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique de `std::basic_ios`) [edit]

clearerr	efface les erreurs Original: clears errors The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]

perror	affiche une chaîne de caractères correspondant de l'erreur de courant à stderr Original: displays a character string corresponding of the current error to stderr The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]

ferror	chèques pour une erreur de fichier Original: checks for a file error The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]

C documentation for feof