json parsing+iphone

Question

如何在iphone.i中做json解析。我用了下面的方法：

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    NSLog(@"viewdidload");
    responseData = [[NSMutableData data] retain]; 
    NSURLRequest *request = [NSURLRequest requestWithURL:
                             [NSURL URLWithString:@"https://maps.googleapis.com/maps/api/place/search/json?location=-33.8670522,151.1957362&radius=500&types=food&name=harbour&sensor=false&key=AIzaSyAbgGH36jnyow0MbJNP4g6INkMXqgKFfHk"]];
    [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"didReceiveResponse");
    [responseData setLength:0];
}

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

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {    
    NSLog(@"didFailWithError");
    label.text = [NSString stringWithFormat:@"Connection failed: %@",
                                            [error description]];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSLog(@"connectionDidFinishLoading");   
    [connection release];
}

请告诉我这是真的吗？如何才能获得我们在xml中所做的准确的标签数据。

Answer 1

...and在iPhone上是这样做的：

NSDictionary *feed = responseData;
// get the array of "results" from the feed and cast to NSArray
NSArray *results= (NSArray *)[feed valueForKey:@"results"];

// loop over all the results objects and print their names
int ndx;
NSDictionary *result;
for (ndx = 0; ndx < results.count; ndx++) {
    NSDictionary *result = (NSDictionary *)[results objectAtIndex:ndx];
    NSLog(@"This is the name of this result: %@", [resultvalueForKey:@"name"]); 
}

Answer 2

之后

 - (void)connectionDidFinishLoading:(NSURLConnection *)connection

你会在这里得到responseData。您必须将其转换为NSString格式，然后简单地编写

[responseString JSONValue];

如果您的响应是数组或字典，那么您必须在accordingly.Like中捕获它。如果您的响应是字典格式的，则编写

NSDictionary *tempDict = [responseString JSONValue];

我希望这能对你有所帮助。

Answer 3

听到是json连接到JSON解析url字符串简单演示，您必须为此添加JSON框架，但现在在iOS5中，json是内置在xcode中的

- (void)viewDidLoad
{
[super viewDidLoad];
[self MethodCalling:@"GET" Body:@"" ValueForPut:@""];
}
-(void)MethodCalling:(NSString *)HttpMethod Body:(NSString *)BodyString ValueForPut:(NSString *)valueforput
{

NSString *strUrl= @"http://xoap.weather.com/weather/local/33135?cc=*&dayf=5&link=xoap&prod=xoap&par=1251259247&key=39128d1062f86c8e";
NSURL *url=[NSURL URLWithString:strUrl];
 strUrl=[strUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSLog(@"domainURL :: %@",url);
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];

[req setTimeoutInterval:60.0];
[req setHTTPMethod:@"GET"];
if(theConnection)//NSURLConnection
    [self Set2Defaults];
theConnection=[[NSURLConnection alloc]initWithRequest:req delegate:self];
if(theConnection)
    webData=[[NSMutableData data]retain];//NSMutableData
else
    NSLog(@"Connection Failed !!!");

NSLog(@"Has got response");
 }


#pragma mark -
#pragma mark NSURL Connection Delegate methods

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

}

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

-(void) connection:(NSURLConnection *) connection didFailWithError:(NSError *) error {

NSLog(@"Connection Failed!!!");

UIAlertView *noConnect = [[UIAlertView alloc] initWithTitle:@"Error!!!" message:@"Request Failed." delegate:self cancelButtonTitle:@"Retry" otherButtonTitles:@"Cancel",nil];
[noConnect show];
[noConnect release];
 }


-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *theXML = @"";
theXML = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSASCIIStringEncoding];

NSLog(@"theXML Values : %@", theXML);

ResponseDict = [theXML JSONValue];
NSLog(@"Responce is.........##%@",[ResponseDict description]);

}

-(void)Set2Defaults {

if (webData != nil){
    [webData release];
    webData = nil;
}

if (theConnection != nil) {
    [theConnection release];
    if (theConnection != nil) 
        theConnection = nil;
}
 }