Question

I’m a newbie with Json, so I want to extract some app information from the app store, I found this question here :

How to get info from the Apple iTunes «App Store» and «Mac App Store»

It allows to get a Json file containing all the app information, but it would be nice if someone could show me how to get the price for example.

Thanks.

Answer 1

Where and how do you want to collect the results? Is this for an app or for some other kind of tool? In the reuslting JSON you have an array “results” where each element has a “currency” and a “price” value. Those can be queired rather simply. For example using the iOS 5 NSJSONSerialization (note this is an example, there has to be more error handling, handling of no / too many entries etc):

// assuming you have the downloaded data

NSError *error = nil;
NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:downloadedData options:nil error:&error];

if (error != nil)
{
    // error handling
}
else
{
    NSArray *results = [jsonData objectForKey:@"results"];

    // assuming you have 1 valid entry
    NSDictionary *result = [results objectAtIndex:0];
    NSNumber *price = [result objectForKey:@"price"];
    NSString *currency = [result objectForKey:@"currency"];

    NSLog(@"Price is %@ @%", price, currency);
}

Similar ways to access the data are avilable in other JSON frameworks, just grad the results array and every dictionary therein has a price and currency value.