I have JSON that reads like this:
{
"categories":["Love", "Hope, "Dreams"],
}
I am familiar with parsing arrays or dictionaries with objects, but I am slightly confused as to how to parse an array full of strings. How do I go about doing so?
use the following custom method
-(NSArray *)stringArrayFromJsonFile:(NSString *)jsonFileName withKey:(NSString *)key
{
NSData *fileContents = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:jsonFileName ofType:#"json"]];
NSError *error;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:fileContents options:kNilOptions error:&error];
NSArray * stringArray = [dict objectForKey:key];
return stringArray;
}
now call that method like
NSArray* stringArray = [self stringArrayFromJsonFile:#"yourJsonFileName" withKey:#"categories"];
You should get the data first.
NSString * JSONString = #"{\"somekey\":[\"somevalue\"]}";
NSData * JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];
id JSONResult = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingAllowFragments error:nil];
if ([JSONResult isKindOfClass:[NSDictionary class]]) {
NSDictionary * dictionary = JSONResult;
} else {
...
}
Related
#"SaveRegistrationIDResult" : #"{\"Table\":[{\"Return_Code\":1,\"Return_Message\":\"ALREADY REGISTERED\"}]}"
I'm finding it impossible to fetch data from this json string.
I'm getting the table Table Object as a NSDictionary using this code.
NSMutableDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSData *processedJsondata = [jsonData objectForKey:#"SaveRegistrationIDResult"];
but I getting errors for everything i try ahead.
I'd like to fetch data from within the Table array ('Return_Code') and print it in a Log.
You are getting json string so you can parse it like,
id jsonString = #"{\"Table\":[{\"Return_Code\":1,\"Return_Message\":\"ALREADY REGISTERED\"}]}"; // or [yourDictionary objectForKey : #"SaveRegistrationIDResult"];
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
Now you can get value of any key from above object like,
NSArray *arr = [jsonObject objectForKey : #"Table"];
NSLog(#"your result : %#", arr);
Lion's comment worked.
This is how I fetched the value. Any optimizations welcome.
NSMutableDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSString *processedJsondata = [jsonData objectForKey:#"SaveRegistrationIDResult"];
NSData *tableData = [processedJsondata dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *tableJsonObject = [NSJSONSerialization JSONObjectWithData:tableData options:0 error:nil];
NSArray *tableArray = [tableJsonObject objectForKey:#"Table"];
NSDictionary *tableObject = [tableArray objectAtIndex:0];
NSString *reposnseCode = [tableObject objectForKey:#"Return_Message"];
NSLog(#"%#",reposnseCode);
How to convert string to JSON object or JSON array in iOS?
my JSON string Like That.
{"Data": [{"ID":"1","Name":"Raj"},{"ID":"2","Name":"Rajneesh"}]}
I want to get ID or Name from this string please help me if anyone now this.
Thank You.
I try below code but print null
NSString *JsonString=#"{"Data": [{"ID":"1","Name":"Raj"},{"ID":"2","Name":"Rajneesh"}]}";
NSData *objectData = [JsonString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:objectData options:0 error:&error];
NSArray* array = [json objectForKey:#"Data"];
NSLog(#"Print Array %#",array);
Use this
NSString *str=#"{\"Data\": [{\"ID\":\"1\",\"Name\":\"Raj\"},{\"ID\":\"2\",\"Name\":\"Rajneesh\"}]}";
NSMutableDictionary *dict=[NSJSONSerialization JSONObjectWithData:[str dataUsingEncoding:NSUTF8StringEncoding] options:kNilOptions error:nil];
NSMutableArray *dataArr=[dict valueForKey:#"Data"];
for (NSDictionary *userData in dataArr) {
NSLog(#"Id:%# Name:%#",[userData valueForKey:#"ID"],[userData valueForKey:#"Name"]);
}
Always Remember that when there are { } curly brackets, it means it is Dictionary and when [ ] this, means Array
NSURL *url=[NSURL URLWithString:#"Your JSON URL"];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSArray *array = json[#"Data"];
for(NSMutableDictionary *dic in array)
{
NSLog(#"%#",dic[#"ID"]); // give 1 & 2
NSLog(#"%#",dic[#"Name"]); // Raj and Rajneesh
}
This is not the correct JSON string which can be parsed by Objective c, get string from encoder and you will get a valid string, other then that for JSON to Dictionary conversion is simple in iOS as its natively supported.
NSData *data = [strJSON dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonResponse = [NSJSONSerialization JSONObjectWithData:data
options:kNilOptions
error:&error];
Here's an example of my data:
[
{
code: "DRK",
exchange: "BTC",
last_price: "0.01790000",
yesterday_price: "0.01625007",
top_bid: "0.01790000",
top_ask: "0.01833999"
}
]
I'm trying to retrieve the value for last_price by loading the contents of my NSDictionary into an Array.
NSURL *darkURL = [NSURL URLWithString:#"https://api.mintpal.com/v1/market/stats/DRK/BTC"];
NSData *darkData = [NSData dataWithContentsOfURL:darkURL];
NSError *error = nil;
NSDictionary *darkDict = [NSJSONSerialization JSONObjectWithData:darkData options:0 error:&error];
self.darkPosts = [NSMutableArray array];
NSArray *darkPostArray = [darkDict objectForKey:#""];
for (NSDictionary *darkDict in darkPostArray) {...
But my json doesn't have a root element, so what do I do?
Additionally, when using the suggested answer, the output is ("...
- (void)viewDidLoad{
[super viewDidLoad];
NSURL *darkURL = [NSURL URLWithString:#"https://api.mintpal.com/v1/market/stats/DRK/BTC"];
NSData *darkData = [NSData dataWithContentsOfURL:darkURL];
NSError *error = nil;
NSDictionary *darkDict = [NSJSONSerialization JSONObjectWithData:darkData options:0 error:&error];
NSString *lastP = [darkDict valueForKey:#"last_price"];
self.dark_label.text = [NSString stringWithFormat: #"%#", lastP];
}
It looks like you are wanting to iterate over your results. The root element is an array not a dictionary so you can just start iterating
NSError *error = nil;
NSArray *items = [NSJSONSerialization JSONObjectWithData:darkData
options:kNilOptions
error:&error];
if (!items) {
NSLog(#"JSONSerialization error %#", error.localizedDescription);
}
for (NSDictionary *item in items) {
NSLog(#"last_price => %#", item[#"last_price"]);
}
If you literally just want to collect an array of the last_price's then you can so this
NSArray *lastPrices = [items valueForKey:#"last_price"];
Convert the JSON to an NSArray with NSJSONSerialization. Then access the value:
NSData *darkData = [#"[{\"code\":\"DRK\",\"exchange\": \"BTC\",\"last_price\": \"0.01790000\",\"yesterday_price\": \"0.01625007\",\"top_bid\": \"0.01790000\"}, {\"top_ask\": \"0.01833999\"}]" dataUsingEncoding:NSUTF8StringEncoding];
NSArray *array = [NSJSONSerialization JSONObjectWithData:darkData
options:0
error:&error];
NSString *value = array[0][#"last_price"];
NSLog(#"value: %#", value);
NSLog output:
value: 0.01790000
If you are having trouble post the code you have written to get some help.
-- updated for new OP code:
The web service returns a JSON array or dictionaries not a JSON dictionary. First you have to index into the array and then index into the dictionary.
NSURL *darkURL = [NSURL URLWithString:#"https://api.mintpal.com/v1/market/stats/DRK/BTC"];
NSData *darkData = [NSData dataWithContentsOfURL:darkURL];
NSError *error = nil;
NSArray *darkArray = [NSJSONSerialization JSONObjectWithData:darkData options:0 error:&error];
NSDictionary *darkDict = darkArray[0];
NSString *lastP = [darkDict valueForKey:#"last_price"];
NSLog(#"lastP: %#", lastP);
NSLog output:
lastP: 0.01970000
Note that the two lines:
NSDictionary *darkDict = darkArray[0];
NSString *lastP = [darkDict valueForKey:#"last_price"];
can be replaced with the single line using array indexing:
NSString *lastP = darkArray[0][#"last_price"];
Where the "[0]" gets the first array element which is a NSDictionary and the "[#"last_price"]" gets the names item from the dictionary.
I'm a newbie about development of iOS.
And when I deal a json with NSJSONSerialization , I find something really a problem to me.
NSLog(#"response: %#", responseString);
NSData *jsonData = [responseString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
NSLog(#"dict: %#", dict);
and the output is:
2013-03-18 20:13:56.228 XXXX[3550:5003] response: {"status":"success","data":"{\"title\":\"\",\"sessionName\":\"sid\",\"sessionID\":\"9217e5df3db6b4b4aa3eed800890069f\",\"rand\":5360}","md5":"292ee1e78628fc6360c647e938c4f1ea"}
2013-03-18 20:13:56.229 XXXX[3550:5003] dict: {
data = "{\"title\":\"\",\"sessionName\":\"sid\",\"sessionID\":\"9217e5df3db6b4b4aa3eed800890069f\",\"rand\":5360}";
md5 = 292ee1e78628fc6360c647e938c4f1ea;
status = success;
with the "\" the data section cannot be a NSDictionary object
So what should I do to make it right?
Sorry for my poor English.
For whatever reason, the value of "data" is not a JSON dictionary, but a string containing JSON data. You can fix this by applying JSONObjectWithData to this string again and replacing the value in the dictionary:
NSData *jsonData = [responseString dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *dict = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
NSData *nestedJsonData = [[dict objectForKey:#"data"] dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *nestedDict = [NSJSONSerialization JSONObjectWithData:nestedJsonData options:NSJSONReadingMutableContainers error:nil];
[dict setObject:nestedDict forKey:#"data"];
NSLog(#"dict: %#", dict);
Output:
dict: {
data = {
rand = 5360;
sessionID = 9217e5df3db6b4b4aa3eed800890069f;
sessionName = sid;
title = "";
};
md5 = 292ee1e78628fc6360c647e938c4f1ea;
status = success;
}
I have a problem parsing JSON string in Objective C:
My JSON:
{"messages":[{"nick":"Tim","message":"Hallo","time":"06.07.2012 13:26:41"}]}
My Objective C Code:
NSError *error = nil;
NSData *data = [NSData dataWithContentsOfURL:#"..URL.."];
NSArray *messages = [data objectForKey:#"messages"];
NSDictionary *json = [NSJSONSerialization
JSONObjectWithData:messages
options:NSJSONReadingMutableLeaves
error:&error];
NSString *nick = [json objectForKey:#"nick"];
NSString *message = [json objectForKey:#"message"];
But this doesn´t work and I don´t know what to do!
Your JSON is a dictionary of arrays of dictionaries, i.e. {[{}]}
NSArray *messages = [json objectForKey:#"messages"];
NSString* nick = [[messages objectAtIndex:0]objectForKey:#"nick"]