On 25 Jul 2012, at 10:08 AM, 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?


It sort of works for streams reading from a memory buffer, IIRC. By "sort of", 
I mean it sometimes returns data and sometimes silently discards data. I now 
avoid NSStream/CFStream unless I'm dealing with an API that requires them--- 
they seem to be an unmaintained corner of the codebase.



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