Parsing XML response Xcode

Question

I want to use a web service and grab the data from the service. I am able to send the request and receive the data but help me with parsing it. heres my code. I want to parse the XML response and store it in a array for further use

-(void)performSearch:(NSString *)searchText
{
    NSString *param = [NSString stringWithFormat:@"ZIP=%@",
                       searchText];

    NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://wsf.cdyne.com/WeatherWS/Weather.asmx/GetCityForecastByZIP?%@", param]];

    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setRequestMethod:@"GET"];

    [request addRequestHeader:@"Content-Type" value:@"application/x-www-form-urlencoded"];

    NSLog(@"%@",param);

    NSLog(@"%@",url);


    NSLog(@"%@",request);
    [request setDelegate:self];
    [request startAsynchronous];

    }
- (void)requestFinished:(ASIHTTPRequest *)request
{
    NSData *response = [request responseData];

    NSLog(@"%@",response);
help me how to parse the data and store it in array 
    //NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:response];


     }

esreli · Accepted Answer · 2012-06-25 15:02:13Z

1

There are plenty of good tutorials for learning how to properly parse XML, here's a quickie:

in .h

@interface ObjectName : ObjectSuperclass <NSXMLParserDelegate> {
    NSMutableString *currentElement;
    NSMutableString *childElement;
    NSMutableDictionary *array;
    NSXMLParser *parser;
}

@end

in .m:

-(void)parseWithData:(NSData *)data {
    parser = [[NSXMLParser alloc] initWithData:data];
    [parser setDelegate:self];
    //You might want to consider additional params like:
    [parser setShouldProcessNamespaces:NO];
    [parser setShouldReportNamespacePrefixes:NO];
    [parser setShouldResolveExternalEntities:NO];
    //And then finally (which activates the delegates):
    [parser parse]; 
 }

Again in .m, insert these NSXMLParser Delegate Methods:

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{    
  currentElement = nil;
  currentElement = [elementName copy];
  if ([elementName isEqualToString:@"xmlParentElement"]) {
    //This means the parser has entered the XML parent element named: xmlParentElement
    //All of the child elements that need to be stored in the array should have their own IVARs and declarations.
    childElement = [[NSMutableString alloc] init];
  }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
  //For all child elements, run this if statement.
  if (currentElement isEqualToString:@"childElement") {
    [childElement appendString:string];
  }
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{   
  if ([elementName isEqualToString:@"xmlParentElement"]) {
    [array addObject:childElement];
  }
}

Feel free to comment if things are unclear!

edited Jun 25, 2012 at 15:02

answered Jun 25, 2012 at 14:56

esreli

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5 Comments

Kashyap Over a year ago

my code is not jumping into parsewithdata method when i run the code

Kashyap Over a year ago

i am able to see the data using NSLog i am new to objective C and read many tutorials but couldn't figure out the mistake im doing

Kashyap Over a year ago

hey Eli Gregory its going through xmlparsing but unable to find the start of xml what do i do its returning null i.e nothing

esreli Over a year ago

For a more in depth answer I will need to know a little more about your problem.. i.e. how is your XML doc formatted? What fields are you drawing from the doc? The code that I wrote above is very much meta code. For it to work , there must be tailoring work done.

esreli Over a year ago

to run the method type: [self parseWithData:response];

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