NSXMLParser not parsing attributes. No NSXMLParser Error.
- by Iris
I am trying to parse the XML located at this URL: http://www.iglooseat.com/gis_iphone_xml.php?zip=06488
// 1) This method gets invoked when the user presses a button on the Iphone to retrieve the xml data
(IBAction)getLocations:(id)sender
{
NSString *msg=nil;
NSString *urlString= [[NSString alloc]
initWithFormat:@"http://www.iglooseat.com/gis_iphone_xml.php?zip=%@",zipField.text];
// send the URL
NSError *error;
[siteList updateLocationsFromURL:urlString parseError:&error];
WPSite *w = [siteList siteAtIndex:0];
// alert user what's in the zipField
msg = [[NSString alloc] initWithFormat:
@"url to send: %@\n site name: %@"
, urlString
, w.name];
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Debug"
message:msg
delegate:self
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[urlString release];
[alert show];
[alert release];
[msg release];
}
// 2) This function takes the URL and performs XML parsing on the data at that URL.
(void)updateLocationsFromURL:(NSString )urlString parseError:(NSError *)error{
/*
NSURL
class that inherits from NSObject
class that provides a way to manipulate URLs and the resources they reference.
*/
NSURL *url = [[NSURL alloc] initWithString:urlString];
/*
initWithContentsOfURL:
initializes a newly allocated data object initialized with the data from
the location specified by a URL.
*/
NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
// init bool to NO
errorConnecting = NO;
// release from mem the NSURfile://localhost/Users/icheung/Desktop/WPMap/Classes/WPSite.mL
[url release];
// set parser delgate to self
[parser setDelegate:self];
// don't process namespace
[parser setShouldProcessNamespaces:YES];
// or namespace prefixes
[parser setShouldReportNamespacePrefixes:NO];
/*
don't care 'bout external (ex. don't perform I/O op's to load external
DTD's (Document Type Definitions))
*/
[parser setShouldResolveExternalEntities:NO];
// start the event-driven parsing operation
[parser parse];
// get NSError object if an error occured during parsing
NSError *parseError = [parser parserError];
if(parseError && error) {
*error = parseError;
NSLog(@"Error code:%d %@", parseError.code, parseError.domain);
errorConnecting = YES;
}
// relase from mem the parser
[parser release];
}
// 3) In the parser:didStartElement:namespaceURI:qualifiedName:attributes: I attempt to extract the 'state' attribute from a 'marker' element in my xml. When I use the gdb debugger to inspect the contents of attributeDict it is empty and I'm not sure why.
(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName
attributes:(NSDictionary *)attributeDict {
if(self.parserContentOfCurrentProperty == nil) {
NSMutableString *tmp = [[NSMutableString alloc] init];
self.parserContentOfCurrentProperty = tmp;
[tmp release];
}
[self.parserContentOfCurrentProperty setString:@""];
self.parserNameOfCurrentProperty = elementName;
if ([elementName isEqualToString:@"markers"]) {
WPSite *tmp = [WPSite alloc];
self.parserCurrentSite = tmp;
// retrive value for attribute
NSString *stateAttribute = [attributeDict valueForKey:@"state"];
if (stateAttribute) {
[self.parserCurrentSite setState:stateAttribute];
}
// add this site to the site list
[siteList addObject:self.parserCurrentSite];
return;
}
}
