如何使用JSONSerialization正确附加NSMutableData和NSData？

Question

im trying to append nsdata to nsmutabledata, on my first attempt, it seems fine, but when i get new contents of nsdata and append it to my nsmutabledata, it seems fine, but my deserialized dictionary returns nil, please help guys. :)

NSData * jsonData = [NSJSONSerialization dataWithJSONObject:myMutableDictionary options:0 error:nil];

NSMutableData * myMutableData = [NSMutableData dataWithData:jsonData];

[myMutableData appendData:jsonData];

NSDictionary *deSerializedDict = [NSJSONSerialization JSONObjectWithData:myMutableData options:NSJSONReadingMutableContainers error:nil];

Answer 1

You should write one JSON function.Why do you want to add NSData to NSMutableData?. If you follow below coding,you can understand easily.

//just give your URL instead of my URL

 NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://stackoverflow.com/questions/30662452/how-to-properly-append-nsmutabledata-and-nsdata-with-jsonserialization"]];

 [request setHTTPMethod:@"GET"];

 [request setValue:@"application/json;charset=UTF-8" forHTTPHeaderField:@"content-type"];

 NSError *err;

 NSURLResponse *response;

 NSData *responseData = [NSURLConnection sendSynchronousRequest:request   returningResponse:&response error:&err];

 NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:responseData options: NSJSONReadingMutableContainers error: &err];

 NSLog("the jsonDict is - %@",jsonDict);

Answer 2

As an absolute, one hundred percent principle, if you have NSData containing a valid JSON object, then after adding anything but white space characters the NSData cannot possibly contain a valid JSON object anymore.

As a special case, if you have TWO NSData containing valid JSON objects, then their concatentation can NEVER contain a valid JSON object.