CODEWITHSUNDEEP
iphoneobjective-cjsonnsdictionary
Denoteone
Denoteone

Reputation: 4055

NSDictionary to NSString JSON

I am trying to wrap my head around pulling a keys value from a JSON array and saving it as a String for comparison later: The following code makes my app crash when it gets to this section of code. I don't understand why.

My json array looks like so:

[{"User_Id":"CRNA000099","User_Name":"jbliz","User_Fname":"Julia"}]

My xcode:

userarray_login = [NSJSONSerialization JSONObjectWithData:dataURL options:kNilOptions error:&error];

 NSDictionary* userType = [userarray_login objectForKey:@"User_Name"];
 NSString *userPermission = [userType objectAtIndex:0];

 if ([userPermission isEqualToString:@"jbliz"])
    {
    NSLog(@"I should get the avalue here: %@", userPermission);
}

I am confused between NSDictionary and NSString. Any feedback would be a

Upvotes: 1

Views: 1277

Answers (3)

Tirth
Tirth

Reputation: 7789

Your json has array of Dictionary you need to follow below steps,

//NSJSONSerialization return you array in userarray_login 

userarray_login = [NSJSONSerialization JSONObjectWithData:dataURL options:kNilOptions error:&error];

//You fetch Dictionary from the array 
     NSDictionary* userType = [userarray_login objectAtIndex:0];

//Fetch NSString value using keyValue
     NSString *userPermission = [userType objectForKey:@"User_Name"];

//String comparison 
     if ([userPermission isEqualToString:@"jbliz"])
        {
        NSLog(@"I should get the avalue here: %@", userPermission);
    }

This is correct code for your stuff.

Upvotes: 1

Vedchi
Vedchi

Reputation: 1210

Json Array : [{"User_Id":"CRNA000099","User_Name":"jbliz","User_Fname":"Julia"},{},...] an array contains Dictionaries.

for this try like, 

 NSArray * userarray_login = [NSJSONSerialization JSONObjectWithData:dataURL options:kNilOptions error:&error];

    for (NSDictionary * dict in userarray_login) { 
        NSString * name = [dict objectForKey:@"User_Name"];
        if ([name isEqualToString:@"jbliz"]) {
            NSLog(@"Value is here: %@", name);
        }
    }

Upvotes: 1

user1673099
user1673099

Reputation: 3289

NSMutableArray *name=[[[NSMutableArray alloc] initWithArray:[userarray_login valueForKey:@"User_Name"]]retain];
// Get the only all Names into name Array from json Array

 NSString *userPermission = [name objectAtIndex:0]; // get the first name from Array

 if ([userPermission isEqualToString:@"jbliz"])
    {
    NSLog(@"I should get the avalue here: %@", userPermission);
}

Upvotes: 1

Related Questions