 | | From: | idesilva at eudoramail.com | | Subject: | Controlling ofstream buffering? | | Date: | 17 Jan 2005 00:25:11 -0800 |
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 | Hi,
I have an app that generates a text log at a very high rate. Currently
I use an ofstream object to write the log. I would like to control when
'exactly' the log is written to the disk. Also I want to be able to
reset the buffer contents without writing them to the disk file.
- Can the 'buffer size' of an ofstream object (in fact, any stream
object) be controlled?
- Can we control *when* the buffer is flushed? [I want ofstream to
flush *only* when I invoke flush(). The default 'nounitbuf' behavior
doesn't do what I want]
- Is there a way to *reset* the ofstream buffer?
Thanks,
Ishan.
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| | From: | Robert Klemme | | Subject: | Re: Controlling ofstream buffering? | | Date: | Mon, 17 Jan 2005 17:43:38 +0100 |
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schrieb im Newsbeitrag
news:1105950311.949682.124190@c13g2000cwb.googlegroups.com...
> Hi,
>
> I have an app that generates a text log at a very high rate. Currently
> I use an ofstream object to write the log. I would like to control when
> 'exactly' the log is written to the disk. Also I want to be able to
> reset the buffer contents without writing them to the disk file.
>
> - Can the 'buffer size' of an ofstream object (in fact, any stream
> object) be controlled?
Only on creation.
> - Can we control *when* the buffer is flushed? [I want ofstream to
> flush *only* when I invoke flush(). The default 'nounitbuf' behavior
> doesn't do what I want]
You can additionally flush the stream, but you cannot prevent a flush when
the buffer is full.
> - Is there a way to *reset* the ofstream buffer?
Nope.
You'll have to roll your own stream class. But that's not too difficult.
Regards
robert
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| | From: | idesilva at eudoramail.com | | Subject: | Re: Controlling ofstream buffering? | | Date: | 18 Jan 2005 01:14:47 -0800 |
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| Thanks.
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