Using GDataXML to Parse Included XML File - iphone

Question

This XML will be included in the app:
<?xml version="1.0" encoding="utf-8"?>
<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>Directory</title>
<description>Directory of Members</description>
<language>en</language>
<item>
<LastName></LastName>
<FirstName></FirstName>
<Address></Address>
<Phone></Phone>
<Email></Email>
</item>
<item>
<LastName></LastName>
<FirstName></FirstName>
<Address></Address>
<Phone></Phone>
<Email></Email>
</item>
</channel>
</rss>
I would like to be able to parse the XML and store into an RSSEntry Class that I have done before with other XMLs. The issue is that the only other XMLs I have worked with have been located online, and I use ASIHttpRequest Classes as part of the method, and am unsure how to go about changing the code to make it fit. I currently use this code:
- (void)viewDidLoad {
[super viewDidLoad];
self.allEntries = [NSMutableArray array];
self.queue = [[[NSOperationQueue alloc] init] autorelease];
self.feeds = [NSArray arrayWithObjects:#"http://316apps.com/LakesideNews/feed/",
nil];
NSLog(#"%#", self.feeds);
[self refresh];
}
- (void)refresh {
for (NSString *feed in _feeds) {
NSURL *url = [NSURL URLWithString:feed];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:self];
[_queue addOperation:request];
}
}
- (void)parseRss:(GDataXMLElement *)rootElement entries:(NSMutableArray *)entries {
NSArray *channels = [rootElement elementsForName:#"channel"];
for (GDataXMLElement *channel in channels) {
NSString *blogTitle = [channel valueForChild:#"title"];
NSArray *items = [channel elementsForName:#"item"];
for (GDataXMLElement *item in items) {
NSString *articleTitle = [item valueForChild:#"title"];
NSString *articleUrl = [item valueForChild:#"guid"];
NSString *articleDateString = [item valueForChild:#"pubDate"];
NSDate *articleDate = [NSDate dateFromInternetDateTimeString:articleDateString formatHint:DateFormatHintRFC822];
NSString *articleImage = [item valueForChild:#"content:encoded"];
RSSEntry *entry = [[[RSSEntry alloc] initWithBlogTitle:blogTitle
articleTitle:articleTitle
articleUrl:articleUrl
articleDate:articleDate
articleImage:articleImage] autorelease];
[entries addObject:entry];
}
}
}
- (void)parseFeed:(GDataXMLElement *)rootElement entries:(NSMutableArray *)entries {
if ([rootElement.name compare:#"rss"] == NSOrderedSame) {
[self parseRss:rootElement entries:entries];
} else if ([rootElement.name compare:#"feed"] == NSOrderedSame) {
[self parseAtom:rootElement entries:entries];
} else {
NSLog(#"Unsupported root element: %#", rootElement.name);
}
}
- (void)requestFinished:(ASIHTTPRequest *)request {
[_queue addOperationWithBlock:^{
NSError *error;
GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:[request responseData]
options:0 error:&error];
if (doc == nil) {
NSLog(#"Failed to parse %#", request.url);
} else {
NSMutableArray *entries = [NSMutableArray array];
[self parseFeed:doc.rootElement entries:entries];
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
for (RSSEntry *entry in entries) {
int insertIdx = [_allEntries indexForInsertingObject:entry sortedUsingBlock:^(id a, id b) {
RSSEntry *entry1 = (RSSEntry *) a;
RSSEntry *entry2 = (RSSEntry *) b;
return [entry1.articleDate compare:entry2.articleDate];
}];
[_allEntries insertObject:entry atIndex:insertIdx];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForRow:insertIdx inSection:0]]
withRowAnimation:UITableViewRowAnimationRight];
}
}];
}
}];
}
- (void)requestFailed:(ASIHTTPRequest *)request {
NSError *error = [request error];
NSLog(#"Error: %#", error);
[self refresh];
}
I know to change all the areas for Title to things like Family name, etc., I just don't know how to go about getting the GDataXML to begin parsing the nested XML.

Answer 1

Ray Wenderlich has a fantastic tutorial covering exactly what you are doing. I would start there. Here's the link.