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) | (desde C++11) |
Abre el archivo cuyo nombre está dado por
1) Original:
Opens the file whose name is given by
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el byte de terminación nula estrecho
2) s cadenaOriginal:
the null-terminated narrow byte string
sThe text has been machine-translated via Google Translate.
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el byte de terminación nula estrecho s.c_str() cadena
Original:
the null-terminated narrow byte string s.c_str()
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como si se aplicase std::fopen(s, modestring), donde
modestring se determina como sigue: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 |
Si
openmode no es uno de los modos de la lista, el open() falla .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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Si la operación tiene éxito y openmode & std::ios_base::ate != 0 abierto (el bit se establece
ate), vuelve a colocar la posición del archivo al final del archivo, como si se aplicase std::fseek(file, 0, SEEK_END). Si el reposicionamiento de falla, llama close() y devuelve un puntero nulo para indicar el fallo .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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Si el archivo asociado ya estaba abierta, devuelve un puntero nulo en seguida .
Original:
If the associated file was already open, returns a null pointer right away.
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Contenido |
[editar] Parámetros
| s | - | el nombre del archivo para abrirlo
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 | - | el modo de apertura de archivo, un binario o de los modos de 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. |
[editar] Valor de retorno
*this en caso de éxito, un puntero nulo en caso de fallo .
Original:
*this on success, a null pointer on failure.
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[editar] Notas
open() se suele llamar a través del constructor o la función miembro open() de std::basic_fstream .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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[editar] Ejemplo
| Esta sección está incompleta Razón: sin ejemplo |
[editar] Ver también
| checks if the associated file is open (función miembro pública) | |
| vacía el búfer área de poner y cierra el archivo asociado 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. (función miembro pública) |
