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    std::freopen

    De cppreference.com
    < cpp | io | c

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    <metanoindex/>

     
    C++
     
    D'entrée / sortie de bibliothèque
    I / O manipulateurs
    C-style I / O
    Tampons
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    Buffers
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    basic_streambuf
    basic_filebuf
    basic_stringbuf
    strstreambuf (obsolète)
    Cours d'eau
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    Streams
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    Abstractions
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    Abstractions
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    ios_base
    basic_ios
    basic_istream
    basic_ostream
    basic_iostream
    Fichier E / O
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    File I/O
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    basic_ifstream
    basic_ofstream
    basic_fstream
    Chaîne I / O
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    basic_istringstream
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    Tableau I / O
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    Array I/O
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    istrstream (obsolète)
    ostrstream (obsolète)
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    Types
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    Types
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    streamoff
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    Error category interface
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    iostream_category (C++11)
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    C-style I / O
    Fonctions
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    Functions
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    Déposer accès
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    File access
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    Entrée / sortie directe
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    Direct input/output
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    fread
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    Entrée non formatée / sortie
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    Unformatted input/output
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    Formatted input/output
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    Fichier de positionnement
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    ftell
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    clearerr
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    remove
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    <tbody> </tbody>
    Déclaré dans l'en-tête <cstdio>
    FILE *freopen( const char *filename, const char *mode, FILE *stream );
    Réaffecte un fichier existant stream flux dans un fichier différent identifié par filenameusing mode spécifié. mode est utilisé pour déterminer le mode d'accès nouveau fichier .
    Original:
    Reassigns an existing file stream stream to a different file identified by filenameusing specified mode. mode is used to determine the new file access mode.
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    Paramètres

    filename -
    nom de fichier à associer le flux de fichier
    Original:
    file name to associate the file stream to
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    mode -
    chaîne de caractères terminée par NULL déterminer le nouveau mode d'accès aux fichiers
    File access
    mode string     		Meaning Explanation Action if file
    already exists     		Action if file
    does not exist
    "r" read Open a file for reading read from start failure to open
    "w" write Create a file for writing destroy contents create new
    "a" append Append to a file write to end create new
    "r+" read extended Open a file for read/write read from start error
    "w+" write extended Create a file for read/write destroy contents create new
    "a+" append extended Open a file for read/write write to end create new
    File access mode flag "b" can optionally be specified to open a file in binary mode. This flag has effect only on Windows systems.
    On the append file access modes, data is written to the end of the file regardless of the current position of the file position indicator.
    Original:
    null-terminated character string determining new file access mode
    File access
    mode string     		Meaning Explanation Action if file
    already exists     		Action if file
    does not exist
    "r" read Open a file for reading read from start failure to open
    "w" write Create a file for writing destroy contents create new
    "a" append Append to a file write to end create new
    "r+" read extended Open a file for read/write read from start error
    "w+" write extended Create a file for read/write destroy contents create new
    "a+" append extended Open a file for read/write write to end create new
    File access mode flag "b" can optionally be specified to open a file in binary mode. This flag has effect only on Windows systems.
    On the append file access modes, data is written to the end of the file regardless of the current position of the file position indicator.
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    stream -
    le flux de fichier à modifier
    Original:
    the file stream to modify
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    Retourne la valeur

    stream en cas de succès, NULL cas d'échec
    Original:
    stream on success, NULL on failure
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    Exemple

    Le code suivant redirige stdout dans un fichier
    Original:
    The following code redirects stdout to a file
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    #include <cstdio>

int main()
{
    std::printf("stdout is printed to console");
    std::freopen("redir.txt", "w", stdout);
    std::printf("stdout is redirected to a file")
    std::fclose(stdout);
}

    Résultat : 

    stdout is printed to console

    Voir aussi
    ouvre un fichier
    Original:
    opens a file
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    (fonction) [edit]
    ferme un fichier
    Original:
    closes a file
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    (fonction) [edit]
    C documentation for freopen