How to parse Google weather API using NSXML?

问题

i want to parse google weather API using NSXML so please give me some Guidance for this.

This is My url

and i have taken such kind of steps:

NSURL *url = [NSURL URLWithString:@"http://www.google.com/ig/api?weather=Ahemdabad"];

 NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
 [theRequest setHTTPMethod:@"POST"];
 NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

 if(theConnection){
  webData = [[NSMutableData data] retain];
  NSLog( @"connection established");
 }
 else {
  NSLog(@"theConnection is NULL");
 }

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
 [webData setLength: 0];
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
 [webData appendData:data]; 
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
 NSLog(@"ERROR with theConenction");
 [connection release];
 [webData release];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connectio   
{     
    NSLog(@"DONE. Received Bytes: %d", [webData length]);

 NSString *theXML = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding];
 NSLog(@"thexml=============>%@", theXML);
 [theXML release];


 if(parser)
 {
  [parser release];
 }

 parser = [[NSXMLParser alloc]initWithData:webData];
 [parser setDelegate: self];
 [parser setShouldResolveExternalEntities: YES];
 [parser parse];

 [connection release];
 [webData release];

}

回答1:

hey ankit you can get this code if at all its helpful to you no need to establish connection

just use this method

-(id)initWithURL:(NSURL*)url arrayRootObjectTags:(NSArray*)arrTags sel:(SEL)seletor andHandler:(NSObject*)handler{
    if(self = [super init] ){
        self.mainArray=arrTags;
        self.MainHandler=handler;
        self.targetSelector=seletor;
        NSLog(@"%@",[url description]);
        NSURLRequest *req=[NSURLRequest requestWithURL:url cachePolicy:NSURLCacheStorageNotAllowed timeoutInterval:30];                 
        con=[[NSURLConnection alloc] initWithRequest:req delegate:self];
        if(con){
            myWebData=[[NSMutableData data] retain];
        } else {
            [MainHandler performSelector:@selector(targetSelector:) withObject:nil];
        }
    }
    return self;
}

also the other supporting method

-(void)parser:(NSXMLParser*)parser didStartElement:(NSString*)elementName namespaceURI:(NSString*)namespaceURI qualifiedName:(NSString*)qualifiedName attributes:(NSDictionary*)attributeDict {
    if([elementName isEqualToString:@"html"] || [elementName isEqualToString:@"HTML"]){
        didGetHTML=YES; [self parserDidEndDocument:parser];
    } else if([[mainArray objectAtIndex:0] isEqualToString:elementName] && [[mainArray objectAtIndex:1] isEqualToString:elementName] && !didGetHTML) {
        objectsArray=[[NSMutableArray alloc] init];
        tmpD=[[NSMutableDictionary alloc] init];
        if(tmpOther==nil) tmpOther=[[NSMutableDictionary alloc] init];      
    } else if([[mainArray objectAtIndex:0] isEqualToString:elementName] && !didGetHTML ) {
        objectsArray=[[NSMutableArray alloc] init];
        if(tmpOther==nil) tmpOther=[[NSMutableDictionary alloc] init];      
    } else if([[mainArray objectAtIndex:1] isEqualToString:elementName] && !didGetHTML ) {
        tmpD=[[NSMutableDictionary alloc] init];
    } else if([mainArray containsObject:elementName] && !didGetHTML){
        [tmpD setValue:[attributeDict valueForKey:@"data"] forKey:elementName];
    }
}

-(void)parser:(NSXMLParser*)parser foundCharacters:(NSString*)string { if(tmpString==nil && !didGetHTML){ tmpString=[[NSString alloc] initWithString:string]; } else if(!didGetHTML){ NSString *t=[NSString stringWithString:tmpString]; if([tmpString retainCount]>0) { [tmpString release]; tmpString=nil; } tmpString=[[NSString alloc] initWithFormat:@"%@%@",t,string]; } }

-(void)parser:(NSXMLParser*)parser didEndElement:(NSString*)elementName namespaceURI:(NSString*)namespaceURI qualifiedName:(NSString*)qualifiedName {
    if([[mainArray objectAtIndex:0] isEqualToString:elementName] && [[mainArray objectAtIndex:1] isEqualToString:elementName] && !didGetHTML){
        [objectsArray addObject:tmpD];
    } else if([elementName isEqualToString:[mainArray objectAtIndex:1]] && !didGetHTML){
        [objectsArray addObject:tmpD];
        [tmpD release]; tmpD=nil;
    } else if([mainArray containsObject:elementName] && !didGetHTML) {
        if(![tmpD valueForKey:elementName]){
            [tmpD setValue:tmpString forKey:elementName];
        }
        [tmpString release]; tmpString=nil;     
    } else {
        [tmpOther setValue:tmpString forKey:elementName];
        [tmpString release]; tmpString=nil;
    }
}

and simply call the initwith url method from which ever class you have written this method

just you have to give root tag object tag and element tag of a particular object tag and also give selector after that take the response in dictionary and they take it in array and display the result according to your value for key

来源：https://stackoverflow.com/questions/3306214/how-to-parse-google-weather-api-using-nsxml

标签

iphone

xml

google-weather-api