Namespace
Varianti

std::fopen

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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
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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
 
Elemento definito nell'header <cstdio>
FILE *fopen( const char *filename, const char *mode );
Apre un file indicato da filename e restituisce un flusso di file associato al file. mode viene utilizzato per determinare la modalità di accesso file.
Original:
Opens a file indicated by filename and returns a file stream associated with that file. mode is used to determine the file access mode.
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[modifica] Parametri

filename -
il nome del file per associare il flusso di file
Original:
file name to associate the file stream to
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mode -
terminazione null stringa di caratteri che determinano l'accesso in modalità file
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 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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[modifica] Valore di ritorno

Aperto flusso di file in caso di successo, NULL in caso di fallimento
Original:
Opened file stream on success, NULL on failure
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[modifica] Vedi anche
chiude un file
Original:
closes a file
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(funzione) [modifica]
sincronizza un flusso di output con il file vero e proprio
Original:
synchronizes an output stream with the actual file
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(funzione) [modifica]
aprire uno stream esistente con un nome diverso
Original:
open an existing stream with a different name
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(funzione) [modifica]
C documentation for fopen
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/io/c/fopen&oldid=25770"