Get values from JSON string - Objective C

Question

I have this JSON response string:

{"d":"{\"ID_usuario\":\"000130\",\"Nombre\":null,\"Vipxlo\":0,\"Provmun\":null,\"Descuentos\":null,\"Listaviplocal\":null}"}`

With this code:

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{
    //Check valid signal

    connection = nil;

    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    //data =nil;

    NSArray *jsonArray = [responseString JSONValue];

How can I do it?

Solution 1

This JSON should result in a Dictionary

NSDictionary *jsonDict = [responseString JSONValue];

then use:

[jsonDict objectForKey:@"d"];

Solution 2

When you can afford to require iOS 5 you should try NSJSONSerialization.

Your code could look like this but I suggest reading the Docs first.

    NSArray* jsonArray = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableLeaves error:someError]

Solution 3

Try using the SBJasonParser library for iOS.

You can then use this code (for all iOS versions):

SBJsonParser* parser = [[[SBJsonParser alloc] init] autorelease];
NSDictionary* myDict = [parser objectWithString: responseString];

Note: Your code above has a JSON Dictionary but you were trying to access it as an Array.

Comments

[roof]

Hi I've added NSString *userName = [result objectForKey:@"Nombre"]; but I've got "variable is not a CFString at this time" value for userName. Do you why is it? Thanks for your help.

[iDroid]

NSJsonSerializattion is the best and optimized solution compared to anyother framework.But here i found the pretty good solution for identifying the best among SBJson and NSJSONSerialization (Before the release of ios5.0 SBJSON is the good framework for handling Json objects).

[sensorario]

I'm sorry but, ... I dont have any JSONValue class. Can someone suggest me how to get this class?

[vikingosegundo]

@SimoneDemoGentili See cortez' answer. OP uses a third party tool, that isnt needed for iOS 5+.

[sensorario]

Where I can find this third party tool?