CODEWITHSUNDEEP
iphoneobjective-cxpathios5html-parsing
Boos1993
Boos1993

Reputation: 99

How to display Xpath on the iPhone

I'm trying to extract the weather information from here using Xpath on the iPhone. As of now it parses all the data but I'm stuck on how to extract the content and display it in a table. This is what I have so far:

NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[ @"http://aviationweather.gov/adds/metars/?station_ids=1234&std_trans=translated&chk_metars=on&hoursStr=most+recent+only&submitmet=Submit"stringByReplacingOccurrencesOfString:@"1234" withString:self.title]]];

TFHpple * doc       = [[TFHpple alloc] initWithHTMLData:data];
NSArray * elements  = [doc searchWithXPathQuery:@"//table[1]//tr"];
NSLog(@"%@", elements);
TFHppleElement * element = [elements objectAtIndex:0];
[element content];              // Tag's innerHTML
[element  tagName];              // "a"
[element  attributes];           // NSDictionary of href, class, id, etc.
[element  objectForKey:@"href"]; // Easy access to single attribute

If anybody needs to see what its outputting so far, let me know.

Thanks, Andrew

Upvotes: 2

Views: 314

Answers (1)

Popeye
Popeye

Reputation: 12113

I had the same issue I got to the point your at and didn't no where to go but I end up implementing this code. Hope it helps there is still little bits need to make it work correctly but do to the nature of the app I have developed this is all I can give you. its not much more its just the actual implementation into your code that you need really. 

#import "XPathQuery.h"


NSMutableArray *weatherArray = [[NSMutableArray arrayWithArray:0]retain]; // Initilize the NSMutableArray can also be done with just an NSArray but you will have to change the populateArray method.
NSString *xPathLookupQuery = @"//table[1]//tr"; // Path in xml
nodes = PerformXMLXPathQuery(data, xPathLookupQuery); // Pass the data in that you need to search through
[self populateArray:weatherArray fromNodes:nodes]; // To populate multiple values into array.

session = [[self fetchContent:nodes] retain]; // To populate a single value and returns value.

- (void)populateArray:(NSMutableArray *)array fromNodes:(NSArray *)nodes 
{
for (NSDictionary *node in nodes) {
    for (id key in node) {
        if ([key isEqualToString:@"nodeContent"]) {
            [array addObject:[node objectForKey:key]];
        }
    }
}
}

You only need either the above code or below code unless you want both.

- (NSString *)fetchContent:(NSArray *)nodes 
{
NSString *result = @"";
for (NSDictionary *node in nodes) {
    for (id key in node) {
        if([key isEqualToString:@"nodeContent"]) {
            result = [node objectForKey:key];
        }
    }
}
return result;
}

Upvotes: 1

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