working with json data - iphone

Question

I have the follow code that parses JSON data received from a server:
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSAutoreleasePool *pool=[[NSAutoreleasePool alloc] init];
NSArray *array_webdata=[[NSArray array] init];
NSString *searchStatus = [[NSString alloc] initWithData:webData encoding:NSUTF8StringEncoding];
array_webdata = [parsedata objectWithString:searchStatus error:nil];
NSDictionary *usersList = [array_webdata valueForKey:#"results"];
//I think that is not a real NSDictionary because if I write NSArray *keys = [usersList allKeys]; the execution crashes
NSLog(#"\n usersList =\n %# \n", usersList);
[searchStatus release];
[connection release];
[webData release];
[pool drain];}
the json data stored in usersList has the structure:
(
{
createTime = "date hour";
fullname = "user name";
"prof_id" = number;
thumb = "image.jpg";
},
{
data of rest of users...
}
)
And I would like create a class to store the data of each user and use "prof_id" when I want to use a particular use.
I need this because the app needs a list with all users (not tableview) and I think this is de easiest way.
Can someone help me? Thanks!!

Answer 1

Please used JsonKit Framework to parse json data received from web service.
Read data and parse using JSONKit:
NSData* jsonData = [NSData dataWithData:webData];
JSONDecoder* decoder = [[JSONDecoder alloc]
initWithParseOptions:JKParseOptionNone];
NSArray* json = [decoder objectWithData:jsonData];
After that, you'll have to iterate over the json variable using a for loop.
Create new class with the name User (file->new->file) inherited from NSObject class, create required parameters in .h/.m file.(do synthesize to generate getter/setter for attributes)
import User.h in your connection class and create objects of User entity in iterator loop and add those object in global scope array.
for(NSDictionary *userInfo in json) {
User* user=[[User alloc] init];
user.fullName=[userInfo valueForKey:#"fullname"];
user.prof_id=[[userInfo valueForKey:#"prof_id"] integerValue];
// Add into your global array
[usersList addObject:user];
[user release];// if ARC is not enable
}
// Check for successful object creation
NSLog(#"USER LIST contain User class Objects- %#",userList);

Answer 2

if i'm not wrong the only thing you need to do is :
NSMutableArray *yourArray = usersList;
and then with a for loop like
for(int i = 0;i<[usersList count] ;i++)
{
NSMutableDictionary *yourDictionary = [usersList objectAtIndex:i];
int prof_id = [yourDictionary valueForKey:#"prof_id"];
}
you can get your prof_id like that.
i hope this helps...

Answer 3

Use JSON Framework, and parse data using below code.
NSString* newStr = [[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:#"yout link to json file"] encoding:NSUTF8StringEncoding error:nil];
NSLog(#"new str - %#",newStr);
NSArray *response = [newStr JSONValue];
NSLog(#"json array - %#",response);
Use the response array to show your results.