How to parse Google weather API using NSXML? - iphone

Question

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];
}

Answer 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