Re: Parsing xml files in Cocoa applications
Re: Parsing xml files in Cocoa applications
- Subject: Re: Parsing xml files in Cocoa applications
- From: Dave DeLong <email@hidden>
- Date: Fri, 31 Oct 2008 08:59:34 -0600
Our local CocoaHeads group had a presentation on XML parsing this
month in Cocoa. We should be getting our screencasts and slides
online in the next day or two. I'll let you know when they're up.
Dave DeLong
On Oct 31, 2008, at 8:56 AM, Nicko van Someren wrote:
On 30 Oct 2008, at 09:29, Paul Reilly wrote:
There is also some good sample code on the iPhone Developer site,
called
SeismicXML which shows how to parse an XML document.
It is worth noting that while the event-driven NSXMLParser class is
available on the iPhone, NXSMLDocument and its friends for the XML
DOM are NOT available on the iPhone. If you have existing code that
uses NSXMLDocument which you want to port to the iPhone you shall
need to rework the code or write classes to emulate the necessary
functionality.
Unless you know that you need to keep all the information in your
XML document for use later you can usually save quite a lot of space
by using the event model and being careful which parts of the data
you bother keeping. I suspect that in the memory-constrained world
of the iPhone this was the rationale behind forcing people to use
the event-driven model. You do however need to be cautious when
using the event driven parser in a memory-constrained environment to
make sure that you don't leave lots of objects in the auto-release
pool after your event calls. If you have a large document which you
parse and filter down to some much smaller data set but on the way
leave a lot of trash in the auto-release pool you can find the
iPhone app running out of memory before you've finished parsing the
document. If you are unsure you can always push a local auto-
release pool at the start of each of the event callbacks which do
any hard work and pop them again before you return from the callback.
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