Varianti

    std::basic_ifstream::open

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    <metanoindex/>

     
    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
    Original:
    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)
     
    std::basic_ifstream
    Membri funzioni
    Original:
    Member functions
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    basic_ifstream::basic_ifstream
    basic_ifstream::operator=(C++11)
    basic_ifstream::swap(C++11)
    basic_ifstream::rdbuf
    Operazioni sui file
    Original:
    File operations
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    basic_ifstream::is_open
    basic_ifstream::open
    basic_ifstream::close
    Non membri funzioni
    Original:
    Non-member functions
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    basic_ifstream::swap(std::basic_ifstream)(C++11)
     
    <tbody> </tbody>
    void open( const char *filename, ios_base::openmode mode = ios_base::in );
    void open( const std::string &filename, ios_base::openmode mode = ios_base::in );
    		 (dal C++11)
    Apre e collaboratori file con il flusso di file. Chiede clear() in caso di successo o setstate(failbit) in caso di fallimento.
    Original:
    Opens and associates file with the file stream. Calls clear() on success or setstate(failbit) on failure.
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    La prima versione chiama efficacemente rdbuf()->open(filename, mode | ios_base::in).
    Original:
    The first version effectively calls rdbuf()->open(filename, mode | ios_base::in).
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    La seconda versione chiama efficacemente open(filename.c_str(), mode).
    Original:
    The second version effectively calls open(filename.c_str(), mode).
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    Parametri

    filename -
    il nome del file da aprire
    Original:
    the name of the file to be opened
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    mode -
    specifica modalità di apertura flusso. E 'tipo di maschera di bit, le seguenti costanti sono definite:
    Constant
    Original:
    Constant
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    		 Explanation
    app
    cercano alla fine del flusso prima di ogni scrittura
    Original:
    seek to the end of stream before each write
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    binary
    aperto in modalità binaria
    Original:
    open in binary mode
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    in
    aprire per la lettura
    Original:
    open for reading
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    out
    aperto per la scrittura
    Original:
    open for writing
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    trunc
    scartare il contenuto del flusso durante l'apertura
    Original:
    discard the contents of the stream when opening
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    ate
    cercano di fine flusso subito dopo aperto
    Original:
    seek to the end of stream immediately after open
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    Original:
    specifies stream open mode. It is bitmask type, the following constants are defined:
    Constant
    Original:
    Constant
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    		 Explanation
    app
    cercano alla fine del flusso prima di ogni scrittura
    Original:
    seek to the end of stream before each write
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    binary
    aperto in modalità binaria
    Original:
    open in binary mode
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    in
    aprire per la lettura
    Original:
    open for reading
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    out
    aperto per la scrittura
    Original:
    open for writing
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    trunc
    scartare il contenuto del flusso durante l'apertura
    Original:
    discard the contents of the stream when opening
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    ate
    cercano di fine flusso subito dopo aperto
    Original:
    seek to the end of stream immediately after open
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    The text has been machine-translated via Google Translate.
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    Valore di ritorno

    (Nessuno)
    Original:
    (none)
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    Esempio

    This section is incomplete
    Reason: no example

    Vedi anche
    controlla se il flusso è associato un file
    Original:
    checks if the stream has an associated file
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    (metodo pubblico) [modifica]
    chiude il file associato
    Original:
    closes the associated file
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    (metodo pubblico) [modifica]