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std::basic_filebuf::open

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< cpp‎ | io‎ | basic filebuf

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C++
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
Original:
Streams
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Abstraktionen
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-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(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
Original:
Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_filebuf
Öffentliche Member-Funktionen
Original:
Public member functions
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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
Geschützt Member-Funktionen
Original:
Protected member functions
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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-Member-Funktionen
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Non-member functions
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swap(std::basic_filebuf)(C++11)
 
std::basic_filebuf<CharT, Traits>* open( const char* s, std::ios_base::openmode mode )
 (1)
std::basic_filebuf<CharT, Traits>* open( const std::string& s, std::ios_base::openmode mode )
 (2) (seit C++11)
Öffnet die Datei, deren Name ist gegeben durch
Original:
Opens the file whose name is given by
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1)
die Null-terminierte engen Bytestring s
Original:
the null-terminated narrow byte string s
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2)
die Null-terminierte engen Bytestring s.c_str()
Original:
the null-terminated narrow byte string s.c_str()
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Wie von anrufenden std::fopen(s, modestring), wo modestring wie folgt bestimmt wird:
Original:
as if by calling std::fopen(s, modestring), where modestring is determined as follows:
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modestring
Original:
modestring
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 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
Wenn openmode nicht einer der aufgeführten Modi, schlägt der open() .
Original:
If openmode is not one of the modes listed, the open() fails.
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Wenn die offene Operation gelingt und openmode & std::ios_base::ate != 0 (die ate Bit gesetzt ist), positioniert die Datei Position bis zum Ende der Datei, als ob durch den Aufruf std::fseek(file, 0, SEEK_END). Wenn die Neupositionierung fehlschlägt, ruft close() und gibt einen Null-Pointer auf Fehler hinweisen .
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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Wenn die zugehörige Datei bereits geöffnet war, gibt ein NULL-Zeiger rechts weg .
Original:
If the associated file was already open, returns a null pointer right away.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

s -
der Name der Datei zu öffnen
Original:
the file name to open
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openmode -
die Datei Öffnen-Modus, ein binäres OR der std::ios_base Modi
Original:
the file opening mode, a binary OR of the std::ios_base modes
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[Bearbeiten] Rückgabewert

*this bei Erfolg ein NULL-Zeiger bei Ausfall .
Original:
*this on success, a null pointer on failure.
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[Bearbeiten] Notes

open() wird in der Regel durch den Konstruktor oder open() Elementfunktion std::basic_fstream genannt .
Original:
open() is typically called through the constructor or the open() member function of std::basic_fstream.
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[Bearbeiten] Beispiel

This section is incomplete
Reason: no example

[Bearbeiten] Siehe auch

 checks if the associated file is open
(öffentliche Elementfunktion) [edit]
spült die Put-Bereich Puffer und schließt die zugehörige Datei
Original:
flushes the put area buffer and closes the associated file
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(öffentliche Elementfunktion) [edit]
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