Working with XML (?)

[bergetun]

Hi,

I am working on a project that parses some xml from a webpage.

Do anyone know of a good tutorial for parsing xml and using its elements in code ?


Thanks

[odbc2000]

iPhone SDK Tutorial: Build a Simple RSS reader for the iPhone | The Apple Blog

[bergetun]

Originally Posted by odbc2000

iPhone SDK Tutorial: Build a Simple RSS reader for the iPhone | The Apple Blog

Thank you.

I heard some rumors that NSXML wasn't available on the iphone (Only on the simulator )

Is that true ?

[odbc2000]

Originally Posted by bergetun

Thank you.

I heard some rumors that NSXML wasn't available on the iphone (Only on the simulator )

Is that true ?

It's not TRUE, NSXML is available both on the simulator and the device.

[bergetun]

Originally Posted by odbc2000

It's not TRUE, NSXML is available both on the simulator and the device.

Okay. Thanks for the help.

[mxweas]

Here is what is going on with NSXML:
NSXMLDocument has been removed from the SDK because it is processor intensive. NSXMLParser has been left over. If you try using NSXMLDocument on the simulator it will work fine because the simulator uses the standard Cocoa Foundation classes. But as soon as you build for the device NSXMLDocument will not function.

Max

[bergetun]

Originally Posted by mxweas

Here is what is going on with NSXML:
NSXMLDocument has been removed from the SDK because it is processor intensive. NSXMLParser has been left over. If you try using NSXMLDocument on the simulator it will work fine because the simulator uses the standard Cocoa Foundation classes. But as soon as you build for the device NSXMLDocument will not function.

Max

Thanks for the explanation.

[bergetun]

Hi again,

Can anyone please explain a bit more on this tutorial :
Parse XML to custom objects : Atrexis Blog: iPhone - Parse XML to custom objects


What I don't understand how I can cast the XMLToObjectParser (myParser) to a Contact object array.

Lets say I want to loop trough the contacts and print all the lastName information.


Edit: Reading my own post, made me realize that I really have some more reading to do .. (hurry up Amazon)

[hypercrypt]

You set the delegate. Then listen for three calls:

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict;
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName;
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string;

You also need an NSMutableArray, let's call it textInProgress.

• In didStartElement you just clear textInProgress to be an empty NSMutableArray.
• In didEndElement you can check what the elementName is and act accordingly, using string as the part between the element beginning and end.
• In foundCharacters just do something like this: [textInProgress appendString:string];

[bergetun]

Originally Posted by hypercrypt

You set the delegate. Then listen for three calls:

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict;
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName;
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string;

You also need an NSMutableArray, let's call it textInProgress.

• In didStartElement you just clear textInProgress to be an empty NSMutableArray.
• In didEndElement you can check what the elementName is and act accordingly, using string as the part between the element beginning and end.
• In foundCharacters just do something like this: [textInProgress appendString:string];

But when I browse the myParser with the "object browser" I see that myParser contains a NSCFArray with all my Contacts.

NSURL *url = [NSURL URLWithString: @"http://localhost/contacts.xml"];
XMLToObjectParser *myParser = [[XMLToObjectParser alloc] parseXMLAtURL:url toObject:@"Contact" parseError:nil];

Shoulnd't it be possible to cast this to a "normal" array and then I can work with it

[tpbradley]

Check out TBXML V1.2 for a super-fast, lightweight, easy to use XML parser!