std::basic_filebuf::open
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< cpp | io | basic filebuf
 |
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| 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) | (C + + 11以来) |
名前で指定されているファイルを開きます
1) Original:
Opens the file whose name is given by
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NULLで終わる狭いバイト列
2) sOriginal:
the null-terminated narrow byte string
sThe text has been machine-translated via Google Translate.
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NULLで終わる狭いバイト列s.c_str()
Original:
the null-terminated narrow byte string s.c_str()
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：std::fopen(s, modestring)は次のように決定され
modestringを呼び出したかのようにOriginal:
as if by calling std::fopen(s, modestring), where
modestring is determined as follows:The text has been machine-translated via Google Translate.
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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 |
openmodeが記載されているモードのいずれかでない場合は、open()は失敗.Original:
If
openmode is not one of the modes listed, the open() fails.The text has been machine-translated via Google Translate.
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オープン操作はopenmode & std::ios_base::ate != 0を呼び出したかのように、ファイルの末尾にファイル位置を成功し、
ate（std::fseek(file, 0, SEEK_END)ビットがセットされている）、再配置した場合。再配置に失敗した場合は、close()を呼び出して、失敗したことを示すためにnullポインタを返す.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.The text has been machine-translated via Google Translate.
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関連付けられたファイルが既に開いていた場合は、すぐにヌルポインタを返す.
Original:
If the associated file was already open, returns a null pointer right away.
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目次 |
[編集] パラメータ
| s | - | オープンするファイル名
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 | - | ファイルオープンモード、バイナリORstd::ios_baseモード
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. |
[編集] 値を返します
*this成功時、失敗時にはNULLポインタ.
Original:
*this on success, a null pointer on failure.
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[編集] ノート
open()は、通常、コンストラクタまたはopen()のstd::basic_fstreamメンバ関数を介して呼び出され.Original:
open() is typically called through the constructor or the open() member function of std::basic_fstream.The text has been machine-translated via Google Translate.
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[編集] 例
| This section is incomplete Reason: no example |
[編集] も参照してください
| checks if the associated file is open (パブリックメンバ関数) | |
| put領域バッファをフラッシュし、関連付けられているファイルを閉じます 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. (パブリックメンバ関数) | |
