How to parse JSON with multiple instance in Object C [duplicate] - iphone

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Closed 10 years ago.
Possible Duplicate:
How to use NSJSONSerialization
I am testing to use the web service of my website on iphone Application.
The JSON with problem is that:
[
{
"name": "Jason1",
"age": 20
},
{
"name": "Jason2",
"age": 40
},
{
"name": "Jason3",
"age": 60
}
]
And my codes:
NSData *jasonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://localhost:3000/all_personal_information.json"]];
NSDictionary *json = nil;
if (jasonData) {
json = [NSJSONSerialization JSONObjectWithData:jasonData options:kNilOptions error:nil];
}
The code work fine with {"name":"jason","age":20}
and I can get the values by using json[#"name"] and json[#"age"]
But i don't know how to get the value from the JSON with problem.
I tried to use [json enumerateKeysAndObjectsWithOptions] to transverse the dictionary.
But I will get an error:
enumerateKeysAndObjectsWithOptions:usingBlock:]: unrecognized selector sent to instance 0x89b2490
But I can get the full JSON when I Log the [json description] into console.

Answer 1

Take it in an array.. for example
NSData *jasonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://localhost:3000/all_personal_information.json"]];
NSDictionary *json = nil;
if (jasonData) {
NSError *e = nil;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:jasonData options:NSJSONReadingMutableContainers error: &e];
}
the array will contain your
{
"name": "Jason1",
"age": 20
}
etc in its individual indexes. when u want to get the values in it, you can use this below method to get the values
NSDictionary *userName = [jsonArray objectAtIndex:1];
NSString *stringName = [userName valueForKey:#"name"];

Answer 2

You're creating a dictionary while you get an array. If you do the following it should work:
id json = nil;
if (jasonData)
{
json = [NSJSONSerialization JSONObjectWithData:jasonData options:kNilOptions error:nil];
}
if ([json isKindOfClass:NSArray.class])
{
for (id personDef in json)
{
if ([personDef isKindOfClass:NSDictionary.class])
{
NSDictionary * dict = (NSDictionary *) moduleDef;
NSString * name = [dict objectForKey:#"name" withClass:NSString.class];
NSLog(#"Person: #%", name);
}
}
}
In here I do some additional checking if the objects are the ones we expect. If this isn't the case you should add (proper) error handling.

Answer 3

it will help you.
NSMutableDictionary *CompaintsAry =[NSJSONSerialization JSONObjectWithData:respo options:kNilOptions error:&error];
NSMutableArray *tempary =[[NSMutableArray alloc]init];
for (int i=0;i < [CompaintsAry count];i++) {
CfResultFatch *rs = [[CfResultFatch alloc] initWithName:[[CompaintsAry obj ectAtIndex:i]objectForKey:#"Name"]
cipd :[[CompaintsAry objectAtIndex:i] objectForKey:#"Age"]];
[tempary addObject:rs];
}
cfComlaintsLists = [[NSMutableArray alloc] initWithArray:tempary];
SelectComplain = [[NSMutableArray alloc] initWithCapacity:[cfComlaintsLists count]];
[chiftab reloadData];