Re: When does NSInputStream's -getBuffer:length: actually work?
Re: When does NSInputStream's -getBuffer:length: actually work?
- Subject: Re: When does NSInputStream's -getBuffer:length: actually work?
- From: Thomas Davie <email@hidden>
- Date: Wed, 25 Jul 2012 18:49:08 +0100
On 25 Jul 2012, at 18:08, Jens Alfke wrote:
> NSInputStream has a -getBuffer:length: method that lets you get the available data from the stream without copying. This is great for performance, and I've written my client code to take advantage of it if it's supported, but every time I've tested, it isn't supported (i.e. just returns NO) so my code just falls back to calling -read:maxLength: instead.
>
> Does anyone know in what circumstances, or in what types of streams, this method actually works?
I don't know for sure, but I would bet it's streams reading from files, which have become memory mapped.
Bob
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