std::basic_filebuf::open
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<metanoindex/>
<tbody> </tbody> 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 o arquivo cujo nome é dado por
Original:
Opens the file whose name is given by
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1)
terminada em nulo
s corda estreita byteOriginal:
the null-terminated narrow byte string
sThe text has been machine-translated via Google Translate.
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2)
terminada em nulo
s.c_str() corda estreita byteOriginal:
the null-terminated narrow byte string
s.c_str()The text has been machine-translated via Google Translate.
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como se ligando
std::fopen(s, modestring), onde modestring é determinada como se segue: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
|
Se
openmode não é um dos modos listados, o open() falhar.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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Se a operação for bem-sucedido e
openmode & std::ios_base::ate != 0 aberto (o bit é definido ate), reposiciona a posição do arquivo para o final do arquivo, como se chamando std::fseek(file, 0, SEEK_END). Se o reposicionamento falhar, chama close() e retorna um ponteiro nulo para indicar falha.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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Se o arquivo associado já estava aberta, retorna um ponteiro nulo imediatamente.
Original:
If the associated file was already open, returns a null pointer right away.
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Parâmetros
| s | - | o nome do arquivo para abrir
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 | - | o modo de abertura de arquivo, um binário OR dos modos 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. |
Valor de retorno
*this em caso de sucesso, um ponteiro nulo em caso de falha.Original:
*this on success, a null pointer on failure.The text has been machine-translated via Google Translate.
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Notas
open() é normalmente chamado através do construtor ou a função de membro 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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Exemplo
| Esta seção está incompleta Motivo: sem exemplo |
Veja também
| checks if the associated file is open (função pública membro) | |
esvaziará o buffer área e colocar fecha o arquivo associado 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. (função pública membro) | |