NSJSONSerialization NSJSONReadingMutableLeaves example ios

NSJSONReadingOptions - NSJSONReadingMutableLeaves

Options used when creating Foundation objects from JSON data—seeJSONObjectWithData:options:error: and JSONObjectWithStream:options:error:.

enum {
   NSJSONReadingMutableContainers = (1UL << 0),
   NSJSONReadingMutableLeaves = (1UL << 1),
   NSJSONReadingAllowFragments = (1UL << 2)
};
typedef NSUInteger NSJSONReadingOptions;

Constants

NSJSONReadingMutableContainers

Specifies that arrays and dictionaries are created as mutable objects.

NSJSONReadingMutableLeaves

Specifies that leaf strings in the JSON object graph are created as instances of NSMutableString.

NSJSONReadingAllowFragments

Specifies that the parser should allow top-level objects that are not an instance of NSArray orNSDictionary.

( NSJSONSerialization NSJSONReadingMutableLeaves example )

NSError *myError = nil;

NSArray *jsonObjects= [NSJSONSerialization JSONObjectWithData:responseData   ptions:NSJSONReadingMutableLeaves error:&myError];


for (NSDictionary * dict in jsonObjects) {
    NSLog(@"Some data %@", [dict objectForKey:@"field"]);
    //replace this to access a valid field
  }

( NSJSONSerialization NSJSONReadingMutableLeaves example )

NSError *myError = nil;
NSDictionary *res = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&myError];

if (!res) { // JSON parser failed }

// dictionary (top-level)
if (![res isKindOfClass:[NSDictionary class]]) {
    // JSON parser hasn't returned a dictionary
}

// sethostname (array of dictionaries)
NSArray *setHostNames = [res objectForKey:@"sethostname"];

// dictionary (array element)
for (NSDictionary *setHostName in setHostNames) {
    // status (number)
    NSNumber *status = [setHostName objectForKey:@"status"];

    // statusmsg (string)
    NSString *statusmsg = [setHostName objectForKey:@"statusmsg"];

    …
}

( NSJSONSerialization NSJSONReadingMutableLeaves example )

NSError *error = nil;
   NSURL *request = [NSURL URLWithString:query];
   NSLog(@"Outgoing Request: %@",[request description]);
   NSString *response =  [NSString stringWithContentsOfURL:request encoding:NSUTF8StringEncoding error:nil];

   if (error) { 
       NSLog(@"ERROR: Unable to get response %@",[error localizedDescription]); 
   }

   NSLog("@Synchronous Response: %@",response);

   NSData *jsonData = [response dataUsingEncoding:NSUTF8StringEncoding];
   NSDictionary *results = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers|NSJSONReadingMutableLeaves error:&error];

   if (error) { 
       NSLog(@"ERROR: Unable to parse JSON %@",[error localizedDescription]); 
   }