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NSDictionary and NSArray plist examples

Georg Tremmel — Fri, 30 Apr 2010 12:42:19 +0000

NSDictionary

 version="1.0" encoding="UTF-8"?>

 version="1.0">
>
	>arrayKey>
	>
		>string1>
		>string2>
		>string3>
		>string4>
	>
	>dicKey>
	>
		>key1>
		>object1>
		>key2>
		>object2>
		>key3>
		>object3>
	>
	>key2>
	>object2>
	>key3>
	>object3>
>
>

NSArray

 version="1.0" encoding="UTF-8"?>

 version="1.0">
>
	>string1>
	>string2>
	>string3>
	>
		>key1>
		>object1>
		>key2>
		>object2>
		>key3>
		>object3>
	>
	>string5>
>
>

At the end, after , there’s another CR.

Linking libxml2 in Xcode

Georg Tremmel — Wed, 11 Nov 2009 03:27:23 +0000

How to link libxml2 in Xcode for use with TouchXML?

1. Copy TouchXML files. They are wrappers to libxml2.
2. Instead of copying an extra copy of libxml2 to the project frameworks, add the following to the target information:

Header Search Paths:

/usr/include/libxml2

Other Linker Flags:

-lxml2

(Of course assuming, that libxml2 is present at this location on your system.)

In the Target Info, make sure to select the current configuration to see the values. Otherwise you get and they look like it’s not possible to edit them. Took me a while to figure out, that changing the configuration [top left] was the key. Duh.

NSMutableArray: setObject vs. setValue

Georg Tremmel — Tue, 10 Nov 2009 03:53:18 +0000

Following situation Using TouchXML to parse XML data, works without problem on example XML files, but crahes on mine.
Problem Empty values in my data set. (sometimes somePlace, sometimes )

/* CXMLDocument setup & parsing omitted */
NSString *e = [[resultElement childAtIndex:counter] stringValue];
NSString *k = [[resultElement childAtIndex:counter] name];
 
 
[blogItem setObject:e forKey:k];
// crashes when e is empty. Displays a (null), is nil

Solution 1
Check for empty e, replace nil with empty string

// check if element is empty
if ( nil == e ) {	// ...or the less elegant (0 == [e length])
	e = @"";
}
[blogItem setObject:e forKey:k];

Solution 2
Use setValue instead of setObject, as setObject crashes and burns when it encounters nil, whereas setValue specifically deals only with strings and handles nil gracefully.

[blogItem setValue:e forKey:k];

NSXMLParser vs libxml2

Georg Tremmel — Mon, 09 Nov 2009 07:53:19 +0000

NSXMLParser parses XML, reports when each node ends, better for very, very large documents.

libxml2 loads whole xml file into memory.

http://code.google.com/p/touchcode/wiki/TouchXML
http://code.google.com/p/kissxml/

iPhone SDK Development by Bill Dudney and Chris Adamson

NSXMLParser
initWithContentsOfURL: may block GUI while downloading, can not handle HTTP authentication.
initWithData: accumulate data with NSURLConnection’s delegate -didReceiveResponse, -didReceiveData, -connectionDidFinishLoading.

TouchXML
- copy TouchXML files to project
- in “Targets”, select target > Get Info > add /usr/include/libxml2 to Header Search Paths
- add libxml2.dylib to “Frameworks”

UPDATE
instead of adding libxml2.dylib link to the Framework on the system:
Other Linker Flags:

-lxml2

Linking libxml2 in Xcode