Trying again, the HTML markup in the previous version of this e-mail sent the 
size over the list limit.  Apologies if the original also turns up....

I created a little test program to run the XML through a parser and mine worked 
which was a bit mystifying until I figured out what the problem is.  

getWeatherXmlForZipCode: is a class method.  You have set the delegate to the 
class not to an object of the class.

On 5 Jan 2010, at 15:58, Eric E. Dolecki wrote:

> http://weather.yahooapis.com/forecastrss?p=01701
> 
> (For an example)
> 
> Here is all the code in question:
> 
> +(NSString*)getWeatherXmlForZipCode: (NSString*)zipCode {


^^^^ + means class method

<snip>

>       NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
>       [parser setDelegate:self];

^^^^ self in a class method is the class itself.


> 
> - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 
> namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
> attributes:(NSDictionary *)attributeDict

^^^^ - means not a class method.


I attach my little test program for completeness and the output.  There's no 
error checking or anything that would make it production quality.


----

#import <Foundation/Foundation.h>

@interface MyParser : NSObject <NSXMLParserDelegate>
{
        
}

-(void) parse: (NSString*) urlString;

@end

@implementation MyParser

-(void) parse: (NSString*) urlString
{
        NSURL* url = [[NSURL alloc] initWithString: urlString];
        NSXMLParser* parser = [[NSXMLParser alloc] initWithContentsOfURL: url];
        [url release];

        [parser setDelegate: self];
        [parser setShouldProcessNamespaces: YES];
        [parser setShouldReportNamespacePrefixes:YES];
        [parser setShouldResolveExternalEntities:YES];

        [parser parse];
        [parser release];
}

-(void)  parser: (NSXMLParser *) parser 
didStartElement: (NSString*) elementName 
   namespaceURI: (NSString*) namespaceURI 
  qualifiedName: (NSString*) qualifiedName 
         attributes: (NSDictionary*) attributeDict
{
        NSLog(@"element %@, ns %@, qn %@", elementName, namespaceURI, 
qualifiedName);
}

@end

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
        MyParser* parser = [[MyParser alloc] init];
        [parser parse: @"http://weather.yahooapis.com/forecastrss?p=01701";];
        [parser release];
    [pool drain];
    return 0;
}

----

2010-01-06 14:46:49.410 TestNSXMLParser[17401:a0f] element rss, ns , qn rss
2010-01-06 14:46:49.412 TestNSXMLParser[17401:a0f] element channel, ns , qn 
channel
2010-01-06 14:46:49.412 TestNSXMLParser[17401:a0f] element title, ns , qn title
2010-01-06 14:46:49.412 TestNSXMLParser[17401:a0f] element link, ns , qn link
2010-01-06 14:46:49.412 TestNSXMLParser[17401:a0f] element description, ns , qn 
description
2010-01-06 14:46:49.413 TestNSXMLParser[17401:a0f] element language, ns , qn 
language
2010-01-06 14:46:49.413 TestNSXMLParser[17401:a0f] element lastBuildDate, ns , 
qn lastBuildDate
2010-01-06 14:46:49.413 TestNSXMLParser[17401:a0f] element ttl, ns , qn ttl
2010-01-06 14:46:49.413 TestNSXMLParser[17401:a0f] element location, ns 
http://xml.weather.yahoo.com/ns/rss/1.0, qn yweather:location
2010-01-06 14:46:49.414 TestNSXMLParser[17401:a0f] element units, ns 
http://xml.weather.yahoo.com/ns/rss/1.0, qn yweather:units
2010-01-06 14:46:49.414 TestNSXMLParser[17401:a0f] element wind, ns 
http://xml.weather.yahoo.com/ns/rss/1.0, qn yweather:wind
2010-01-06 14:46:49.414 TestNSXMLParser[17401:a0f] element atmosphere, ns 
http://xml.weather.yahoo.com/ns/rss/1.0, qn yweather:atmosphere
2010-01-06 14:46:49.414 TestNSXMLParser[17401:a0f] element astronomy, ns 
http://xml.weather.yahoo.com/ns/rss/1.0, qn yweather:astronomy
2010-01-06 14:46:49.414 TestNSXMLParser[17401:a0f] element image, ns , qn image
2010-01-06 14:46:49.415 TestNSXMLParser[17401:a0f] element title, ns , qn title
2010-01-06 14:46:49.415 TestNSXMLParser[17401:a0f] element width, ns , qn width
2010-01-06 14:46:49.415 TestNSXMLParser[17401:a0f] element height, ns , qn 
height
2010-01-06 14:46:49.415 TestNSXMLParser[17401:a0f] element link, ns , qn link
2010-01-06 14:46:49.415 TestNSXMLParser[17401:a0f] element url, ns , qn url
2010-01-06 14:46:49.415 TestNSXMLParser[17401:a0f] element item, ns , qn item
2010-01-06 14:46:49.416 TestNSXMLParser[17401:a0f] element title, ns , qn title
2010-01-06 14:46:49.416 TestNSXMLParser[17401:a0f] element lat, ns 
http://www.w3.org/2003/01/geo/wgs84_pos#, qn geo:lat
2010-01-06 14:46:49.416 TestNSXMLParser[17401:a0f] element long, ns 
http://www.w3.org/2003/01/geo/wgs84_pos#, qn geo:long
2010-01-06 14:46:49.417 TestNSXMLParser[17401:a0f] element link, ns , qn link
2010-01-06 14:46:49.417 TestNSXMLParser[17401:a0f] element pubDate, ns , qn 
pubDate
2010-01-06 14:46:49.417 TestNSXMLParser[17401:a0f] element condition, ns 
http://xml.weather.yahoo.com/ns/rss/1.0, qn yweather:condition
2010-01-06 14:46:49.417 TestNSXMLParser[17401:a0f] element description, ns , qn 
description
2010-01-06 14:46:49.418 TestNSXMLParser[17401:a0f] element forecast, ns 
http://xml.weather.yahoo.com/ns/rss/1.0, qn yweather:forecast
2010-01-06 14:46:49.418 TestNSXMLParser[17401:a0f] element forecast, ns 
http://xml.weather.yahoo.com/ns/rss/1.0, qn yweather:forecast
2010-01-06 14:46:49.418 TestNSXMLParser[17401:a0f] element guid, ns , qn guid

----_______________________________________________

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