I'm learning a very basic method to download data from a weather api.
Basically trying to follow a tutorial.
Using the URL, I am able to download the data in JSON format into a dictionary. Then put into an array.
My question now is how do I read the particular value of an item in the array.
For example, when I do an NSLOG of the array I get the following... I only cut/paste a couple as there are 55 items.
So my question is how do I grab a particular value our of this array?
2013-03-18 14:37:57.576 LocalWeatherV3[1220:c07] loans: {
UV = 2;
"dewpoint_c" = "-4";
"dewpoint_f" = 24;
"dewpoint_string" = "24 F (-4 C)";
"display_location" = {
city = "Jersey City";
country = US;
"country_iso3166" = US;
elevation = "47.00000000";
full = "Jersey City, NJ";
latitude = "40.75180435";
longitude = "-74.05393982";
state = NJ;
"state_name" = "New Jersey";
zip = 07097;
};
estimated = {
};
"feelslike_c" = 2;
"feelslike_f" = 35;
"feelslike_string" = "35 F (2 C)";
"forecast_url" = "http://www.wunderground.com/US/NJ/
here is a piece of the .m
- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
NSArray* latestLoans = [json objectForKey:#"current_observation"]; //2
NSLog(#"loans: %#", latestLoans); //3
// 1) Get the latest loan
//NSDictionary* loan = [latestLoans objectAtIndex:1];
NSInteger counter = [latestLoans count];
thanks in advance!!
so when I do this
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
and i mouse over the local watch, I see
json NSDictionary * 0x08d62d40
[0] key/value pair
key id 0x08d61cf0
value id 0x08d62100
[1] key/value pair
key id 0x08d62150
value id 0x08d633a0
then i do
NSArray* latestLoans = [json objectForKey:#"current_observation"]; //2
NSLog(#"loans: %#", latestLoans); //3
and one of the items I want is in "latestloans" which is where all that data shows up. so I cant figure out how to grab one of the items
Let's assume you're trying to grab the forecast url. It's as simple as:
// update this line
NSDictionary *latestLoans = [json objectForKey:#"current_observation"];
// url variable will contain the first forecast url in the array
NSString *url = [latestLoans objectForKey:#"forecast_url"];
Related
I am trying to get response of first key value without mentioning key name of "A" using objective C. I cant get exactly, please help me to get from below response.
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves | NSJSONReadingMutableContainers error:&error];
NSDictionary *response = [JSON[#"response"]firstObject];
response = {
A = {
company = (
{
no = "115";
student = "Mich";
school = (
{
grade = A;
}
);
test = "<null>";
office = tx;
}
);
};
}
There are a few ways to do this, depending on your exact requirements. If you just need to access the value of each key in JSON[#"response"], you can enumerate the JSON dictionary:
[JSON enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
NSDictionary *dict = (NSDictionary *)obj;
...
if (shouldStop) { // whatever condition you want, if any
*stop = YES;
}
}];
If you want some kind of ordering, you need to use [JSON allKeys]:
NSArray *keys = [[JSON allKeys] sortedArrayUsing...]; // Use whichever sort method you like
for (NSString *key in keys) {
NSDictionary *dict = JSON[key];
...
}
If all you want are the values, you can use [JSON allValues]. Sort if desired.
I'm able to retrieve data from the weather map api, however I can't figure out how to exactly parse the data. I'm able to do it only for a certain part of it.
This is the JSON data:
{
base = "cmc stations";
clouds = {
all = 56;
};
cod = 200;
coord = {
lat = "29.66";
lon = "-82.3";
};
dt = 1403641995;
id = 4156404;
main = {
humidity = 74;
pressure = 1018;
temp = "304.08";
"temp_max" = "306.48";
"temp_min" = "302.15";
};
name = Gainesville;
rain = {
3h = 0;
};
sys = {
country = US;
message = "0.2087";
sunrise = 1403605821;
sunset = 1403656392;
};
weather = (
{
description = "broken clouds";
icon = 04d;
id = 803;
main = Clouds;
}
);
wind = {
deg = 153;
gust = "1.54";
speed = "0.51";
};
}
Now I am able to get only one part of it :
base = "cmc stations"
like this:
- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
NSLog(#"values %#",json);
NSLog(#"Checking values ------------ %#",[json objectForKey:#"cloud"]);
}
But when I try to do the same for other fields like
clouds
coord
main
I can't. I get a null value.
I'm guessing I need an additional NSDictionary or NSArray but just not sure how to go about it. Can someone please tell how can I do this? I'm mainly looking to get data from the main block :
humidity
temp
temp_max
temp_min
rain
sunrise
sunset
I think I have found a solution:
Here's how I'm getting the data:
NSString* base = [json objectForKey:#"base"];
NSLog(#"Value of first base variable: %#",base);
// NSArray* base = [json objectAtIndex:0];
NSArray *clouds = [json objectForKey:#"clouds"];
NSLog(#"Value of first clouds‹ variable: %#",clouds);
NSArray *coord = [json objectForKey:#"coord"];
NSLog(#"Value of first coord variable: %#",coord);
NSDictionary *main = [json objectForKey:#"main"];
NSLog(#"Value of first coord variable: %#",main);
NSArray* humidity = [main objectForKey:#"humidity"];
NSLog(#"humidity levels found manually : %#",humidity);
NSArray* temp_max = [main objectForKey:#"temp_max"];
NSLog(#"max temp levels found manually : %#",temp_max);
The problem is that most of those values are dictionaries, not arrays. When you see { } and colons (:) that will generally indicate the presence of a dictionary of key-value pairs, even though some of them may only have one such pair which might make it appear like an array or a stand-alone object.
To get clouds for instance:
NSDictionary *clouds = [json objectForKey:#"clouds"];
NSNumber *allClouds = [clouds objectForKey:#"all"];
NSLog(#"Value of first clouds‹ variable: %#",allClouds);
To get coord:
NSDictionary *coords = [json objectForKey:#"coord"];
NSNumber *lon = [coords objectForKey:#"lon"];
NSNumber *lat = [coords objectForKey:#"lat"];
NSLog(#"Value of lon is: %#",lon);
list = ({
clouds = 24;
speed = "4.31";
temp = {
day = "283.84";
eve = "283.84";
night = "283.84";
};
}),
Please can anyone tell me what am I doing wrong - I want to display list-->temp-->day value in table first I am trying to get data in an array which is terminating.
Here is my code am I doing any wrong
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:dataBuffer options:-1 error:nil];
NSLog(#"%#",json);
NSMutableDictionary * list = [json objectForKey:#"list"];
NSMutableArray *arrays = [[NSMutableArray alloc]initWithCapacity:0];
for (NSDictionary *lists in [list allValues]) {
[arrays addObject:[list valueForKey:#"temp"]];
}
If you want to access day then use below line,
NSString *day = [json valueForKeyPath:#"list.temp.day"];
Your list is an array, so if you want to do your things without changing much, you can replace:
NSMutableDictionary * list = [json objectForKey:#"list"];
With:
NSMutableDictionary * list = [[json objectForKey:#"list"] objectAtIndex:0];
I got json reponse in the following way...i have tried to parse in many ways all went ruin.
dic:
(
{
events = {
id = 1;
name = "Event One";
};
},
{
events = {
id = 2;
name = "Test 2";
};
},
{
events = {
id = 12;
name = "vivek 11";
};
},
)
NSDictionary *jsonDictionaryResponse = [response JSONValue];
NSString *name=[[[jsonDictionaryResponse objectForKey:#"events"]objectAtIndex:0]valueForKey:#"name"];
json response:
Login response :[{"events":{"id":"1","name":" Event
One"}},{"events":{"id":"2","name":"Test
2"}},{"events":{"id":"12","name":"vivek
11"}},{"events":{"id":"13","name":"Baby's Day
out"}},{"events":{"id":"15","name":"Childrens
Day"}},{"events":{"id":"16","name":"event
two"}},{"events":{"id":"17","name":"Test
Creattion"}},{"events":{"id":"29","name":"Susan
Test"}},{"events":{"id":"30","name":"Summer
Holidays"}},{"events":{"id":"38","name":"Event
7"}},{"events":{"id":"69","name":"vivek event for
tests"}},{"events":{"id":"102","name":"chinees food mela"}}]
first transform your response string to NSData. then try this:
NSError *error;
NSArray *jSONArray = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&error];
for (NSDictionary *dict in jSONArray) {
NSDictionary *event = [dict objectForKey=#"events"];
NSString *name = [event objectForKey:#"name"];
....
}
The easiest way to understand a JSON object in Objective-C is to understand how it breaks things up into Arrays and Dictionaries. Every time you see a "[" think Array. Every time you see a "{" think Dictionary.
An Array can have Dictionary or other Array objects as part of the collection and a Dictionary can have Array or more Dictionary objects which can contain more Arrays or Dictionaries.
If you remember that "[ ]" means Array and "{ }" means Dictionary, you will know JSON in Objective-C.
Check that result coming as JSON. it is not aDictionary check it
here
PLease find the code here
NSArray *jsonArrayResponse = [response JSONValue];
NSDictionary *firstDic = [jsonArrayResponse objectAtIndex:0];
NSDictionary *secondDic = [firstDic objectForKey:#"events"];
NSLog(#"The values in the events dictioanry is %# ",[secondDic allValues]);
NSString *stringNAme = [secondDic objectForKey:#"id"];
Well I guess its an easy question (because I am only learning IOS recently).
Most of the tutorials that I have seen show simple JSON key value examples.
However I am looking a JSON structure which has the following format:
So I have lets say a JSON page that displays something like:
loans: (
{
activity = "Personal Products Sales";
"basket_amount" = 0;
"bonus_credit_eligibility" = 1;
"borrower_count" = 1;
description = {
languages = (
en
);
};
"funded_amount" = 0;
id = 623727;
image = {
id = 1457061;
"template_id" = 1;
};
"loan_amount" = 475;
location = {
country = Philippines;
"country_code" = PH;
geo = {
level = country;
pairs = "13 122";
type = point;
};
town = "Maasin City, Leyte";
};
name = Zita;
"partner_id" = 145;
"planned_expiration_date" = "2013-11-28T21:00:02Z";
"posted_date" = "2013-10-29T21:00:02Z";
sector = Retail;
status = fundraising;
use = "to buy additional stocks of soap, toothpaste, dish washing products, etc.";
},
So for example if I want to extract the name I understand the key pair ideas so I just do something like:
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
NSArray* latestLoans = [json objectForKey:#"loans"]; //2
NSDictionary* loan = [latestLoans objectAtIndex:0];
NSString *name = [loan objectForKey:#"name"];
And then *name should evaluate to : Zita.
But my question is ....
1) What wizardry do I need to do in order to get access data deep inside the structure like "level = country;" (the level is located inside "geo" which is located inside "location")
Can someone explain how to do this ?
Exactly the same way as you're doing right now :)
NSDictionary* loan = [latestLoans objectAtIndex:0];
NSDictionary* location = [loan objectForKey:#"location"];
NSDictionary* geo = [locationobjectForKey:#"geo"];
NSString* level = [geo objectforKey:#"country"];
or shorter:
NSDictionary* loan = [latestLoans objectAtIndex:0];
NSString* level = loan[#"location"][#"geo"][#"level"];