std::basic_filebuf::open

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Ingresso / libreria di output

I / O manipolatori

C-style I / O

Buffer Original: Buffers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (deprecato)

Streams Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Astrazioni Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

String I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

Array I / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream (deprecato)

ostrstream (deprecato)

strstream (deprecato)

Tipi Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

Errore categoria interfaccia Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iostream_category (C++11)

io_errc (C++11)

 

std::basic_filebuf

Funzioni membro pubbliche Original: Public member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_filebuf::basic_filebuf

basic_filebuf::~basic_filebuf

basic_filebuf::operator= (C++11)

basic_filebuf::swap (C++11)

basic_filebuf::is_open

basic_filebuf::open

basic_filebuf::close

Protetto funzioni membro Original: Protected member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_filebuf::showmanyc

basic_filebuf::underflow

basic_filebuf::uflow

basic_filebuf::pbackfail

basic_filebuf::overflow

basic_filebuf::setbuf

basic_filebuf::seekoff

basic_filebuf::seekpos

basic_filebuf::sync

basic_filebuf::imbue

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap(std::basic_filebuf) (C++11)

 

std::basic_filebuf<CharT, Traits>* open(constchar* s, std::ios_base::openmode mode )	(1)
std::basic_filebuf<CharT, Traits>* open(conststd::string& s, std::ios_base::openmode mode )	(2)	(dal C++11)

Apre il file il cui nome è dato da

Original:

Opens the file whose name is given by

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1)

il null-terminated stretta byte s stringa

Original:

the null-terminated narrow byte string s

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2)

il null-terminated stretta byte s.c_str() stringa

Original:

the null-terminated narrow byte string s.c_str()

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come se chiamando std::fopen(s, modestring), dove viene determinato modestring come segue:

Original:

as if by calling std::fopen(s, modestring), where modestring is determined as follows:

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modestring Original: modestring The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	openmode & ~ate
"r"	in
"w"	out, out|trunc
"a"	app, out|app
"r+"	out|in
"w+"	out|in|trunc
"a+"	out|in|app, in|app
"rb"	binary|in
"wb"	binary|out, binary|out|trunc
"ab"	binary|app, binary|out|app
"r+b"	binary|out|in
"w+b"	binary|out|in|trunc
"a+b"	binary|out|in|app, binary|in|app

Se openmode non è una delle modalità elencate, la open() fallisce.

Original:

If openmode is not one of the modes listed, the open() fails.

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Se l'operazione ha esito positivo e aperto openmode &std::ios_base::ate!=0 (il bit ate è impostato), riposiziona la posizione del file alla fine del file, come se chiamando std::fseek(file, 0, SEEK_END). Se il riposizionamento non riesce, chiama close() e restituisce un puntatore nullo per indicare l'errore.

Original:

If the open operation succeeds and openmode &std::ios_base::ate!=0 (the ate bit is set), repositions the file position to the end of file, as if by calling std::fseek(file, 0, SEEK_END). If the repositioning fails, calls close() and returns a null pointer to indicate failure.

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Se il file associato è stato già aperto, restituisce un puntatore nullo subito.

Original:

If the associated file was already open, returns a null pointer right away.

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Parametri

s	-	il nome del file da aprire Original: the file name to open The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
openmode	-	la modalità di apertura del file, un file binario o delle modalità std::ios_base Original: the file opening mode, a binary OR of the std::ios_base modes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

*this in caso di successo, un puntatore nullo in caso di errore.

Original:

*this on success, a null pointer on failure.

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Note

open() viene in genere chiamato tramite il costruttore o la funzione di membro del open()std::basic_fstream.

Original:

open() is typically called through the constructor or the open() member function of std::basic_fstream.

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Vedi anche

is_open	checks if the associated file is open (metodo pubblico)
close	svuota il buffer dell'area mettere e chiude il file associato Original: flushes the put area buffer and closes the associated file The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)