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POxcode 4.2 Loop Through XML Data Elements
 

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  1. POxcode 4.2 Loop Through XML Data Elements
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    <p>I am very confused on how I am supposed to loop through XML elements for my current iPhone app project. I will show my code, then clarify my question.</p> <p>Here is sample XML I am using:</p> <pre><code>&lt;restaurant_details&gt; &lt;total_results&gt;90&lt;/total_results&gt; &lt;restaurant&gt; &lt;name&gt;Through the Garden&lt;/name&gt; &lt;distance_from_current_location&gt;0.55&lt;/distance_from_current_location&gt; &lt;restaurant_id&gt;123&lt;/restaurant_id&gt; &lt;longitude&gt;-84.373734&lt;/longitude&gt; &lt;latitude&gt;39.258606&lt;/latitude&gt; &lt;address&gt;10738 Kenwood Rd | cincinnati ,OH | 45242&lt;/address&gt; &lt;phone_number&gt;513-791-2199&lt;/phone_number&gt; &lt;restaurant_type&gt;General&lt;/restaurant_type&gt; &lt;/restaurant&gt; &lt;/restaurant_details&gt; </code></pre> <p>Getting data for my table:</p> <pre><code>- (void)get_table_data { NSString *day = [self dateInFormat:@"%A"]; NSLog (@"At get_table_data"); NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.url.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if (theConnection) { NSLog (@"At connection"); receivedData = [NSMutableData data]; } } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [receivedData setLength:0]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [receivedData appendData:data]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { } -(void)connectionDidFinishLoading:(NSURLConnection *)connection { // NSString *theXML = [[NSString alloc] initWithBytes: [myWebData mutableBytes] length:[myWebData length] encoding:NSUTF8StringEncoding]; // NSLog(@"%@",theXML);[theXML release]; if(parser){ parser = nil; } parser = [[NSXMLParser alloc] initWithData: receivedData]; [parser setDelegate: self]; [parser setShouldResolveExternalEntities: YES]; [parser parse]; } </code></pre> <p>And my parser code:</p> <pre><code>- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict{ NSLog (@"At parser"); currentElement = elementName; if ([currentElement isEqualToString:@"restaurant_details"]) { if ([currentElement isEqualToString:@"total_results"]) { //NSLog(@"Element: %@", currentElement); }else if ([currentElement isEqualToString:@"restaurant"]) { restaurantObj = [[DOR_RestaurantClass alloc]init]; } } } - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{ if([currentElement isEqualToString:@"name"]) { restaurantObj.name=[NSString stringWithFormat:@"%@",string]; //NSLog(@"Name to be saved in Array :- %@",string); } if([currentElement isEqualToString:@"distance_from_current_location"]) { restaurantObj.distance=[NSString stringWithFormat:@"%@",string]; //NSLog(@"Name to be saved in Array :- %@",string); } if([currentElement isEqualToString:@"restaurant_id"]) { restaurantObj.restId=[NSString stringWithFormat:@"%@",string]; //NSLog(@"Name to be saved in Array :- %@",string); } if([currentElement isEqualToString:@"address"]) { NSArray *stringArray = [string componentsSeparatedByString:@" | "]; restaurantObj.address=[stringArray objectAtIndex:0]; restaurantObj.address2=[stringArray objectAtIndex:1]; restaurantObj.address3=[stringArray objectAtIndex:2]; //NSLog(@"Name to be saved in Array :- %@",string); } if([currentElement isEqualToString:@"phone_number"]) { restaurantObj.phone=[NSString stringWithFormat:@"%@",string]; //NSLog(@"Name to be saved in Array :- %@",string); } if([currentElement isEqualToString:@"description"]) { restaurantObj.description=[NSString stringWithFormat:@"%@",string]; //NSLog(@"Name to be saved in Array :- %@",string); } if([currentElement isEqualToString:@"image_url"]) { restaurantObj.image=[NSString stringWithFormat:@"%@",string]; //NSLog(@"Name to be saved in Array :- %@",string); } if([currentElement isEqualToString:@"restaurant_type"]) { //restaurantObj.Name=[NSString stringWithFormat:@"%@",string]; //NSLog(@"Name to be saved in Array :- %@",string); } NSLog (@"At parser2"); if(!currentElementValue) currentElementValue=[[NSMutableString alloc] initWithString:string]; else [currentElementValue appendString:string]; NSLog(@"the parser just found this text in a tag:%@",string); } -(void)parser:(NSXMLParser*)parser didEndElement:(NSString*)elementName namespaceURI:(NSString*)namespaceURI qualifiedName:(NSString*)qualifiedName { NSLog(@"Current element in End Element Category:- %@",currentElement); if([elementName isEqualToString:@"restaurant"]) { [listItems addObject:restaurantObj]; NSLog(@"Array: %@", listItems); }else{ currentElementValue=nil; } } </code></pre> <p>Here's my .h for my restaurant class:</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @interface DOR_RestaurantClass : NSObject @property (nonatomic, retain) NSString *restId; @property (nonatomic, retain) NSString *image; @property (nonatomic, retain) NSString *name; @property (nonatomic, retain) NSString *description; @property (nonatomic, retain) NSString *distance; @property (nonatomic, retain) NSString *address; @property (nonatomic, retain) NSString *address2; @property (nonatomic, retain) NSString *address3; @property (nonatomic, retain) NSString *phone; @property (nonatomic, retain) NSString *expires; @end </code></pre> <p>And my .m:</p> <pre><code>#import "DOR_RestaurantClass.h" @implementation DOR_RestaurantClass @synthesize restId; @synthesize image; @synthesize name; @synthesize description; @synthesize distance; @synthesize address; @synthesize address2; @synthesize address3; @synthesize phone; @synthesize expires; @end </code></pre> <p>I am getting my data and so forth, so that's not an issue. My question is this: With multiple "restaurant" tags in my XML data, how do I sort through the XML so that I keep restaurant data together? I come from PHP, so I would have done a foreach on the restaurant tags, but I'm not sure how the NSXMLParser is supposed to keep the data seperated. I will be putting this information into an NSMutableArray in the end. I just don't know where to start, and cannot find any good examples on doing this. Any and all help is greatly appreciated.</p> <p><strong>This has been updated</strong></p> <p>My array <code>listItems</code> (NSMutableArray) is <code>null</code> when I print it to <code>NSLog</code>.</p>
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