How to reach members of json with iOS - ios

Question

I want to reach from ios to a .net .asmx web service, and I reach with the following code:
NSString *urlString = #"http://www.****.com/Mobile.asmx/HelloWorld";
NSURL *url = [NSURL URLWithString:urlString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod: #"POST"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
NSError *errorReturned = nil;
NSURLResponse *theResponse =[[NSURLResponse alloc]init];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&theResponse error:&errorReturned];
if (errorReturned)
{
//...handle the error
}
else
{
NSString *retVal = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"%#", retVal);
//...do something with the returned value
}
It returns clean json {"hellom":"Hello World","hellom2":"HelloWorld2"} but I can't reach members and value one by one
How can I do that?

Answer 1

You can convert JSON data into an object by using the following code...
NSData *jsonData = ... the data you got from the server
NSDictionary *object = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
object will then be a NSDictionary like this...
#{
hellom : #"Hello World",
hellom2: #"HelloWorld2"
}
You can then get to the keys and values like any other dictionary.