how can parse this json file in iphone [duplicate] - iphone

Question

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Closed 10 years ago.
I am new in iPhone programming. Can anyone tell how parse the JSON string in iPhone?
I'm using JSON parsing in my application. This is my JSON data:
The JSON format is dz.
{
"firstName": "John",
"lastName": "Smith",
"age": 25,
"address": {
"streetAddress": "21 2nd Street",
"city": "New York",
"state": "NY",
"postalCode": "10021"
}
}
How can I do this parsing?

Answer 1

You can use some JSON-Framework, i.e.
https://github.com/stig/json-framework

Answer 2

Another solution would be NSRegularExpression
Save the json Data in a string and then use the regex
For example an Regex for the first line
NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"\"firstName\":[^\"]*\"([^\"]*)\"" options:0 error:&error];
NSArray *matches = [regex matchesInString:theString options:0 range:NSMakeRange(0, [theString length])];
NSTextCheckingResult *match = [matches objectAtIndex:0];
NSLog([theString substringWithRange:[match rangeAtIndex:1]]);
Explanation:
the regex looks for matches where you have "firstName": and then a variable number of signs except of "(because " inidicates where the data begins). ([^\"]) marks a specific range in the regex (so that you can extract it individually whit this line [theString substringWithRange:[match rangeAtIndex:1]]. [^\"] means every sign except "(because this is the end of data). I know this can be confusing at first. But If you take some time with it you will see that it's pretty easy.