如何使用NSXML解析Google weather API？

Question

我想使用NSXML解析谷歌天气API，所以请给我一些指导。

这是My url

我采取了这样的步骤：

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

嘿，ankit，你可以得到这个代码，如果它对你有帮助的话，不需要建立连接

只需使用此方法

-(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;
}

还有另一种支持方法

-(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：(NSXMLParser*)解析器foundCharacters:( NSString *)string { if(tmpString==nil && !didGetHTML){ tmpString=[NSString alloc : string]；} else if(!didGetHTML){ NSString *t=NSString string: tmpString；if(tmpString retainCount>0) {tmpString release；tmpString=nil；} tmpString=[NSString alloc：@“%@%@”，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;
    }
}

并且只需调用initwith url方法，您就可以从中编写此方法的任何类。

您只需给出根标签、对象标签和特定对象标签元素标签，然后再给出选择器，然后在字典中获取响应，它们以数组的形式获取响应，并根据您的key值显示结果