iOS NSDictionary error - iphone

Question

I'm parsing a JSON here and am getting the data correctly. However, when I try to put the info in an NSDictionary and the read it, I get this error
'NSInvalidArgumentException', reason: '-[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x1cda3d50'
heres the code
if (data != nil) {
NSDictionary *res = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
NSDictionary *dic = [[res objectForKey:#"data"] objectForKey:#"current_condition"];
self.location = [[dic objectForKey:#"request"]objectForKey:#"query"];
}
Any idea on whats going wrong here? Thanks.
EDIT
this is what i get when i log NSDictionary *res
data = {
"current_condition" = (
{
cloudcover = 100;
humidity = 86;
"observation_time" = "11:11 PM";
precipMM = "2.2";
pressure = 1019;
"temp_C" = 1;
"temp_F" = 34;
visibility = 8;
weatherCode = 296;
weatherDesc = (
{
value = "Light rain";
}
);
weatherIconUrl = (
{
value = "http://www.worldweatheronline.com/images/wsymbols01_png_64/wsymbol_0033_cloudy_with_light_rain_night.png";
}
);
winddir16Point = SSW;
winddirDegree = 210;
windspeedKmph = 15;
windspeedMiles = 9;
}
);
request = (
{
query = "North Massapequa, United States Of America";
type = City;
}
);
}

Answer 1

Your JSON object probably contains an array somewhere where you expected a dictionary (you sent objectForKey: to an array object).
Try dumping the JSON somewhere and make sure it's in the format you expect.
EDIT: As you can see from the dump, res[#"request"] is an array (it has ()). Thus, you are calling objectForKey:#"query" on the request array and crashing.
Try self.location = [[[res objectForKey:#"request"] objectAtIndex:0] objectForKey:#"query"]; instead.

Answer 2

You're misinterpreting the output of the NSDictionary log, helped by what I believe to be a long-standing bug.
The output looks like this:
data = {
"current_condition" = (
{
cloudcover = 100;
This hides the actual shape of the data. See the long break after the = on the data, current_condition, weatherDesc, etc lines? There should be a line break there, so the output looks like this:
data =
{
"current_condition" =
(
{
cloudcover = 100;
The () indicates an array. (Yes, even though [] is used elsewhere. This output is old and crusty, and I doubt Apple could fix it without breaking code even if they suddenly decided it was important.)
This shows the true shape of the data: current_condition is an array. The dictionary is the first (index 0) object in the array, not the array itself.
Across the whole data, this would look like this:
data =
{
"current_condition" =
(
{
cloudcover = 100;
humidity = 86;
"observation_time" = "11:11 PM";
precipMM = "2.2";
pressure = 1019;
"temp_C" = 1;
"temp_F" = 34;
visibility = 8;
weatherCode = 296;
weatherDesc =
(
{
value = "Light rain";
}
);
weatherIconUrl =
(
{
value = "http://www.worldweatheronline.com/images/wsymbols01_png_64/wsymbol_0033_cloudy_with_light_rain_night.png";
}
);
winddir16Point = SSW;
winddirDegree = 210;
windspeedKmph = 15;
windspeedMiles = 9;
}
);
}
Adjust your code appropriately for the extra level of indirection and you should be fine.

Answer 3

-[__NSCFArray objectForKey:]: unrecognized selector - you can see here that, obviously, you're trying to call objectForKey: on array.
Here:
self.location = [[dic objectForKey:#"request"]objectForKey:#"query"];
dic is an array:
data = {
"current_condition" = ( // <--- array
probably you wanted to do:
self.location = [[res objectForKey:#"request"]objectForKey:#"query"]; // res, not dic
but request is also an array and you'll still get exactly same error...