How Can I process all elements in xml? - iphone

Question

I have an xml like this, but my XMLParser jumps 1-2 elements, and not process it. I think it works fine, but it not. What do i wrong?
Here is the xml, and i'd like to get the all item tag, and it's child elements.
<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>News</title>
<description>News - Android</description>
<link>http://www.p.com</link>
<item>
<title>World Bench Press highlights - Day 2</title>
<pubDate>Tue, 21 May 2013 00:00:00 +0000</pubDate>
<imgLink>http://www.powerlifting-ipf.com/typo3temp/pics/1b7ecb3ac3.jpg</imgLink>
<description>desc </description>
<URL> some URL </URL>
</item>
</channel>
</item>
</rss>
</channel>
Here is my XMLParser file, but i can't get any node, and it not put in my array. Not going to the
if ([elementname isEqualToString:#"item"])
#import <Foundation/Foundation.h>
#import "XMLParser.h"
#implementation XMLParser
#synthesize tweets = _tweets;
NSMutableString *currentNodeContent;
NSMutableString *copy;
NSXMLParser *parser;
Tweet *currentTweet;
bool isStatus=YES;
-(id) loadXMLByURL:(NSString *)urlString
{
_tweets = [[NSMutableArray alloc] init];
NSURL *url = [NSURL URLWithString:urlString];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
parser = [[NSXMLParser alloc] initWithData:data];
parser.delegate = self;
[parser parse];
NSLog(#"0");
return self;
}
- (void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
NSLog(#"1");
NSLog(#"currentnode %#",currentNodeContent);
currentNodeContent = [[NSMutableString alloc] initWithCapacity:100];
[currentNodeContent appendString:string];
}
- (void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementname namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
NSLog(#"2 Elementname : %#",elementname);
if ([elementname isEqualToString:#"item"])
{
currentTweet = [Tweet alloc];
isStatus = YES;
}
if ([elementname isEqualToString:#"title"])
{
NSLog(#"%#",currentNodeContent);
currentTweet.content = [NSString stringWithFormat:#"%# %#",currentTweet.content ,currentNodeContent];
}
}
- (void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementname namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
NSLog(#"ELEMENT: %#",elementname);
if ([elementname isEqualToString:#"description"])
{
currentTweet.description = currentNodeContent;
}
if ([elementname isEqualToString:#"pubDate"])
{
currentTweet.dateCreated = currentNodeContent;
}
if ([elementname isEqualToString:#"title"])
{
currentTweet.title = currentNodeContent;
}
if ([elementname isEqualToString:#"imgLink"])
{
currentTweet.imgLink = currentNodeContent;
}
if ([elementname isEqualToString:#"URL"])
{
currentTweet.URL = currentNodeContent;
}
if ([elementname isEqualToString:#"item"])
{
NSLog(#"%# elem:",currentNodeContent);
[self.tweets addObject:currentTweet];
currentTweet = nil;
currentNodeContent = nil;
}
}
#end

Answer 1

Your approach is wrong because you are reallocating your mutable string every time that the XML parser finds new characters. This means that if you get a string like #"Hello", and the strings gets parsed into two separated string #"He" and #"llo", just #"llo" gets put into the mutable string. The correct approach is to allocate a new mutable string every time that you find a new tag, not when you find new characters.
Not sure because I am not aware of the whole context, but I would try to edit your first two methods this way:
- (void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
NSLog(#"1");
NSLog(#"currentnode %#",currentNodeContent);
[currentNodeContent appendString:string];
}
- (void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementname namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
currentNodeContent= [NSMutableString new];
NSLog(#"2 Elementname : %#",elementname);
if ([elementname isEqualToString:#"item"])
{
currentTweet = [Tweet alloc];
isStatus = YES;
}
}
Let me know what result you get. I also recommend putting breakpoints into every method to see (in the case) why you get some particular strings instead of expected results.
Edit
As for the XML, I tried to check it with xmllint, and it some errors. The problem is with these two extra lines after closing the channel tag:
</item> <!-- Not needed -->
</rss>
</channel> <!-- Not needed -->

Answer 2

You have one between and . Maybe that tag could be messing the parse procedure, try deleting it