On 27 May 2012, at 7:14 PM, John Drake wrote:
> Looking at the documentation for NSXMLParser, it seems like the
> initWithStream: method to initialize a NSXMLParser would be the perfect
> solution to my problem. I can initialize the parser with a NSInputStream and
> then call the parse method on NSXMLParser whenever I receive data over my
> socket which should in turn call the NSXMLParser delegates.
The documentation for -[NSXMLParser -initWithStream:] is sparse, but I see that
the description is "Initializes the receiver with the XML contents from the
specified stream _and parses it_" [EA]. I guess that there should be no need to
call -[NSXMLParser parse] on the incoming data; the whole point of hooking the
parser up to a stream should be that you don't have to manage the stream
yourself, right?
> However, I'm not seeing any of the delegates being called, the only method I
> see being called is the stream delegate stream:handleEvent:.
I wonder if it's productive to make your ContentParser the delegate** of the
input stream. It's the NSXMLParser that's interested in the incoming data. The
convention in the Delegate pattern is that objects have at most one delegate. I
do wonder why your setting of .delegate persists after you pass the stream into
the parser.
— F
** In Cocoa parlance, a "delegate" is an object that implements the methods of
a delegate protocol (in this case your ContentParser is the delegate of the
parser). The methods themselves are "delegate methods." The latter term may be
awkward, but "delegate" has to be saved for "the object to which functionality
is delegated."
--
Fritz Anderson
Xcode 4 Unleashed: Don't bring your bathroom copy into the kitchen — were you
raised in a barn?
<http://x4u.manoverboard.org/>
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