Question

I have task that involves creating the right design for the JSON string before I can get a response from the webservice. The JSON string has to look like this:

{"nid":"","vocab":"", "inturl":"testoverview", "mail":"", "md5pw":""}

and my JSON string looks like this:

"nid:",
"vocab:",
"inturl:testoverview",
"mail:",
"md5pw:"

as you can see it’s not built the same way, I’m not using braces, or separating the strings the right way. And I don’t know how to do this.

my code for this is here:

NSString *nid = @"nid:";
NSString *vocab = @"vocab:";
NSString *inturl = @"inturl:testoverview";
NSString *mail = @"mail:";
NSString *md5pw = @"md5pw:";

NSArray *jsonArray = [NSArray arrayWithObjects:nid, vocab, inturl, mail, md5pw, nil];
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonArray options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];


FSProductTestHandler *handler = [[FSProductTestHandler alloc] init];

if (!jsonData) {
    NSLog(@"Got an error; %@", error);
} else if(jsonData) {

    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

    NSString *url = @"http://www.taenk.dk/services/mobile";
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url] cachePolicy:NSURLCacheStorageAllowed timeoutInterval:30.0];

    [request setValue:jsonString forHTTPHeaderField:@"X-FBR-App"];
    [[NSURLConnection alloc] initWithRequest:request delegate:self];

}

Can anyone help me with this issue?

Answer 1

You are feeding an array to the serialisation which means you’ll get a JSON array as output i.e soemthing like:

[ "foo", "bar", "baz"]

(note the brackets [ ...] instead of braces { ... })

You need to build an NSDictionary and for your particular example, the quickest way is like this:

NSDictionary* dictionary = [NSDictionary dictionaryWithObjectsAndKeys: 
                                @"", @"nid",
                                @"", @"vocab",
                                @"testoverview", @"inturl",
                                @"", @"md5pw", 
                                @"", @"mail",
                                nil];

Feed that into NSJSONSerialization and you’ll get what you want.