Re: Testing if a NSPipe has available data
Re: Testing if a NSPipe has available data
- Subject: Re: Testing if a NSPipe has available data
- From: Alastair Houghton <email@hidden>
- Date: Mon, 10 Aug 2009 11:40:14 +0100
On 10 Aug 2009, at 09:29, Frédéric Testuz wrote:
I'm using gnuplot to obtain graph of data. You can set gnuplot to
send results in various formats and to stdout
I found the way to call it and get the data with NSTask and NSPipe.
Actually, I get the image as an eps. The whole pack of data come in
several packs obtain by the pair of methods -[NSFileHandle
readInBackgroundAndNotify] and -[NSFileHandle availableData].
But I have to know when there is no more data to wait for. I have
found a solution in :
<http://www.cocoabuilder.com/archive/message/cocoa/2000/11/21/31112>
which use ioctl. This solution works, but it is a very low api and
the message is a little old now.
I just want to know if there is, today, another solution with a
higher api perhaps ?
From the documentation:
availableData
Returns the data available through the receiver.
[snip]
... Returns an empty data object if the end of file is reached. ...
So what's wrong with waiting for -[NSFileHandle availableData] to
return with zero bytes?
Kind regards,
Alastair.
--
http://alastairs-place.net
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