如何使用NSXML解析Google天气API？

Question

我想用NSXML解析谷歌天气API，所以请给我一些指导。

这是My url

，我已经采取的步骤，类型：

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

哎ANKIT你可以得到这个代码，如果在其所有帮助你没有必要建立连接

只用这种方法

-(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; 
} 

还有其他配套方法

-(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]; 
    } 
} 

- （空）解析器：（*的NSXMLParser）分析器foundCharacters：（的NSString *）字符串{ 如果（tmpString ==零& & didGetHTML！）{ tmpString = [[NSString alloc] initWithString：string];其他如果（！didGetHTML）{NBRtring * t = [NSString stringWithString：tmpString]; if（[tmpString retainCount]> 0）{[tmpString release]; tmpString =无; } 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; 
    } 
} 

，并简单地调用从中不断类，你写了这个方法

只是你必须给根标签对象标签和特定对象标记的元素标签，也是initwith URL方法给选择器后，在字典中的响应，他们把它在阵列中，并显示结果根据您的值为键