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std::freopen

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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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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
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Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
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Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
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Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
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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fopen
freopen
fclose
fflush
Entrée / sortie directe
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Direct input/output
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fread
fwrite
Entrée non formatée / sortie
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Unformatted input/output
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Formatted input/output
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remove
rename
tmpfile
tmpnam
 
Defined in header <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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Sommaire

[modifier] 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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[modifier] Retourne la valeur

stream en cas de succès, NULL cas d'échec
Original:
stream on success, NULL on failure
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[modifier] 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

[modifier] 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