The hint is that the NSXMLParser docs say:
Parameters
stream
The input stream. The content is incrementally loaded from the specified stream
and parsed.
if (*ra4 != 0xffc78948) { return false; }
On 8 Aug 2011, at 17:59, Mikkel Islay wrote:
> Thanks for the explanation, Jens too.
> The hint that NSXMLParser has that behaviour is that it accepts an
> NSInputStream, or that it relies on a delegate for communicating
> "parse-events"?
>
> Mikkel
>
>
> On 8 Aug 2011, at 10:34, Andreas Grosam wrote:
>
>> No. Asynchronous routines can be implemented above a blocking interface.
>> Blocking and asynchronous interfaces work well together, and you may not
>> even notice the existence of a blocking interface since it is working under
>> the hood as an implementation detail.
>>
>> For instance the parser *could* (we don't know) be implemented as a
>> "recursive decent" parser. This kind of parser will effectively require that
>> the parsing routine blocks, when there is no further input available, since
>> the state of the parser will be in its call stack. So you can't just stop
>> and exit the parse function in the middle of a stream, and then continue
>> with a newly invoked method when more data is available.
>>
>> The parser would just dispatch its events on the main thread where the
>> delegate can handle them. So, from the view point of the delegate, it looks
>> like an asynchronous interface.
>>
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