How to fetch details from NSData - iphone

Question

I want to fetch specified data html_instructions from the below URL. I could take all data from this URL.
But I need the specific html_instructions only. How can I split the data?
I used the following code to convert the URL to NSData:
NSString *url = [NSString stringWithFormat:#"http://maps.googleapis.com/maps/api/directions/json?origin=Chennai&destination=Madurai&sensor=false"];
NSURL *googleRequestURL=[NSURL URLWithString:url];
dispatch_async(kBgQueue, ^{
NSData* data = [NSData dataWithContentsOfURL: googleRequestURL];
});

Answer 1

Use this as :
NSData* data = [NSData dataWithContentsOfURL:googleRequestURL];
if (data == nil) {
return;
}
NSError* error;
NSMutableDictionary* json = [NSJSONSerialization
JSONObjectWithData:data
options:kNilOptions
error:&error];
NSLog(#"Json : %#",json);
Hope it helps you.

Answer 2

I parsed the json from the following url and printed the html instructions try copy this code and try:
http://maps.googleapis.com/maps/api/directions/json?origin=Toronto&destination=Montreal&sensor=false
NSData *receivedData = Received data from url;
NSError* error;
NSMutableDictionary* parsedJson = [NSJSONSerialization JSONObjectWithData:receiveData options:kNilOptions error:&error];
NSArray *allkeys = [parsedJson allKeys];
for(int i = 0; i < allkeys.count; i++){
NSLog(#"############################");
if([[allkeys objectAtIndex:i] isEqualToString:#"routes"]){
NSArray *arr = [responseJsonValue objectForKey:#"routes"];
NSDictionary *dic = [arr objectAtIndex:0];
NSLog(#"ALL KEYS FROM ROUTE: %#", [dic allKeys]);
NSArray *legs = [dic objectForKey:#"legs"];
NSLog(#"legs array count %d", legs.count);
for(int i = 0; i < legs.count; i++){
NSArray *stepsArr = [[legs objectAtIndex:i] objectForKey:#"steps"];
for (int i = 0; i < stepsArr.count; i++) {
NSLog(#"HTML INSTRUCTION %#", [[stepsArr objectAtIndex:i] objectForKey:#"html_instructions"]);
}
}
}
NSLog(#"############################");
}