I am having trouble only executing objectAtIndex if I have values present.
My code:
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSDictionary *results = [json objectForKey:#"d"];
NSString *error = [results objectForKey:#"error"];
NSLog(#"results::%#", [results objectForKey:#"agency"]);
if ( results !=nil)
{
item = [[results objectForKey:#"agency"] objectAtIndex:0];
codeItem = [[results objectForKey:#"agency"] objectAtIndex:1];
}
It works fine if I have data in the json but if the json comes back like this:
{"d":{"success":true,"agency":[]}}
It crashes, I know my if statement is wrong but I dont know the correct method to make this work.
Just check the value before getting the object:
NSArray *agencyItem = [results objectForKey:#"agency"];
if ([agencyItem count] > 1)
{
codeItem = [agencyItem objectAtIndex:1];
}
Related
This question already has answers here:
How To Add New Keys and Values Into Plist Using Objective C?
(1 answer)
Save NSDictionary to plist
(3 answers)
Closed 7 years ago.
I have created JSON data store Into Plist. Now the problem is after JSON data storage, I need to add two set of keys into every array of dictionary items like below Image_2.The key name isParent - Boolean YES and isChild - Boolean YES with levels like mentioned below Image_2.
Now I have below structure of plsit datas Its perfectly working by below code.
I need to add two keys for outside of object subjectcount and inside of objectsubjectcount red marked datas.
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves | NSJSONReadingMutableContainers error:&error];
NSDictionary *response = JSON[#"response"];
NSArray *keys = [response allKeys];
NSMutableArray *objects = [NSMutableArray new];
for (NSString *key in keys) {
NSMutableDictionary *object = response[key];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"subject = %#",object[#"subject"]];
NSArray *objectsWithSameSubject = [objects filteredArrayUsingPredicate:predicate];
NSInteger subjects = [object[#"subject"] integerValue];
if (subjects > 0) {
NSMutableArray *Objects_Subjectcount = [NSMutableArray new];
[object setObject:Objects_Subjectcount forKey:#"Objects_Subjectcount"];
for (NSInteger i = 0; i < subjects; i++) {
[Objects_Subjectcount addObject:object];// object or anything you need
}
}
[objects addObject:object];
}
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = paths.firstObject;
NSString *plistPath = [documentsPath stringByAppendingPathComponent:#"File.plist"];
NSError *writeError = nil;
NSDictionary *finalDict = #{#"Objects": objects};
NSData *plistData = [NSPropertyListSerialization dataWithPropertyList:finalDict format:NSPropertyListXMLFormat_v1_0 options:NSPropertyListImmutable error:&writeError];
if(plistData){
[plistData writeToFile:plistPath atomically:YES];
}
else {
NSLog(#"Error in saveData: %#", error);
}
NOTE : all the datas store by JSON but after storage need to add additional values by manually! Thats I am trying
NSData *plistData = [NSPropertyListSerialization dataWithPropertyList:finalDict format:NSPropertyListXMLFormat_v1_0 options:NSPropertyListMutable error:&writeError];
Retrieve data from plist like this.
NSMutableDictionary *plistDic = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
Now suppose you want to update first array of dictionary then
NSMutableArray *array = [[NSMutableArray alloc]init:[plistDic objectAtIndex:0]]
You can do for loop if you want to change all array data...Right i am just using first object data..
NSMutableDictionary *dict = [[NSMutableDictionary alloc]init:[array objectAtIncex:0]];
[dict addObject:"yourdata" forKey:"yourkey"];
[array replaceObject:dict atIndex:0];
[plistDic replaceObjectAtIndex:0 withObject:array];
And last
[plistDic writeToFile:plistPath atomically:YES];
The object from response[key] is immutable so it can't be modified as below:
[object setObject:Objects_Subjectcount forKey:#"Objects_Subjectcount"];
Making it mutable as below, it can be modified by any method add/remove/set.
NSMutableDictionary *object = [response[key] mutableCopy];
Hope using below modified block, you would see required changes.
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves | NSJSONReadingMutableContainers error:&error];
NSDictionary *response = JSON[#"response"];
NSArray *keys = [response allKeys];
NSMutableArray *objects = [NSMutableArray new];
for (NSString *key in keys) {
NSMutableDictionary *object = [response[key] mutableCopy];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"subject = %#",object[#"subject"]];
NSArray *objectsWithSameSubject = [objects filteredArrayUsingPredicate:predicate];
NSInteger subjects = [object[#"subject"] integerValue];
if (subjects > 0) {
[object setObject:#"" forKey:#"level"];
[object setObject:#(YES) forKey:#"isParent"];
NSMutableArray *Objects_Subjectcount = [NSMutableArray new];
for (NSInteger i = 0; i < subjects; i++) {
[Objects_Subjectcount addObject:#{#"level":#(0), #"isChild":#(YES)}];
}
[object setObject:Objects_Subjectcount forKey:#"Objects_Subjectcount"];
}
[objects addObject:object];
}
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = paths.firstObject;
NSString *plistPath = [documentsPath stringByAppendingPathComponent:#"File.plist"];
NSError *writeError = nil;
NSDictionary *finalDict = #{#"Objects": objects};
NSData *plistData = [NSPropertyListSerialization dataWithPropertyList:finalDict format:NSPropertyListXMLFormat_v1_0 options:NSPropertyListImmutable error:&writeError];
if(plistData){
[plistData writeToFile:plistPath atomically:YES];
}
else {
NSLog(#"Error in saveData: %#", 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.
My JSON String is :
[
{'Local':'webaddress'},
{'QA':'webaddress1'}
]
My Code is :
NSMutableDictionary *dataDictonary = [NSJSONSerialization
JSONObjectWithData:responseData
options:0
error:nil];
NSArray *keys = [dataDictonary allKeys];
NSArray *values = [dataDictonary allValues];
int i=0;
NSLog(#"",[keys count]);
NSLog(#"",[values count]);
int i=0;
for ( NSString *items in keys )
{
NSLog(#"----");
NSLog(#"Name: %#", items);
NSLog(#"Address: %#", values[i++]);
NSLog(#"----");
}
Here i get size as nothing blank in NSlog and can't Parse this value don't don't why. Please help..
Your JSON is an Array with Objects inside so you need to convert it to a NSArray:
NSString *json_string = #"[{\"Local\": \"webaddress\" }, {\"QA\": \"webaddress1\" }]";
NSError *error;
NSArray *JSON =
[NSJSONSerialization JSONObjectWithData: [json_string dataUsingEncoding:NSUTF8StringEncoding]
options: NSJSONReadingMutableContainers
error: &error];
NSLog(#"Local: %#", JSON[0][#"Local"]); // output is: Local: webaddress
UPDATE
// itherate through array
for(NSDictionary *dictionary in JSON)
{
//now you can iterate throug each dicitonary
NSEnumerator *enumerator = [dictionary keyEnumerator];
id key;
while((key = [enumerator nextObject])){
NSLog(#"key=%# value=%#", key, [dictionary objectForKey:key]);
}
}
Log looks like this:
key=Local value=webaddress
key=QA value=webaddress1
Please help me debug this code
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(queue, ^{
NSError *error = nil;
NSURL *urls = [NSURL URLWithString:[NSString stringWithFormat:#"http://cnapi.iconnectgroup.com/api/UserProfile?id=1"]];
NSString *json = [NSString stringWithContentsOfURL:urls encoding:NSASCIIStringEncoding error:&error];
NSLog(#"JSon data = %# and Error = %#", json, error);
if(!error)
{
NSData *jsonData = [json dataUsingEncoding:NSASCIIStringEncoding];
NSArray *myJsonArray = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
NSLog(#"JSON data is :: %#", myJsonArray);
for(NSDictionary *jsonDictionary in myJsonArray)
{
//NSString *uids = jsonDictionary[#"UID"];
NSString *address1 = jsonDictionary[#"Address1"];
NSString *address2 = jsonDictionary[#"Address2"];
NSString *city = jsonDictionary[#"City"];
NSString *emailId = jsonDictionary[#"EmailID"];
NSString *fname = jsonDictionary[#"FName"];
NSString *fax = jsonDictionary[#"Fax"];
NSString *lname = jsonDictionary[#"LName"];
NSString *password = jsonDictionary[#"Password"];
NSString *phone = jsonDictionary[#"Phone"];
NSString *state = jsonDictionary[#"State"];
NSString *uids = [jsonDictionary objectForKey:#"UID"];
NSString *zip = jsonDictionary[#"Zip"];
NSString *company = jsonDictionary[#"company"];
NSString *department = jsonDictionary[#"department"];
NSLog(#"Uid is = %#", uids);
NSLog(#"First Name = %#", fname );
NSLog(#"Last Name = %#", lname);
NSLog(#"Company = %#", company);
NSLog(#"Email Id = %#", emailId);
NSLog(#"Password = %#", password);
NSLog(#"Department = %#", department);
NSLog(#"Address 1 = %#", address1);
NSLog(#"Address 2 = %#", address2);
NSLog(#"City = %#", city);
NSLog(#"State = %#", state);
NSLog(#"Zip = %#", zip);
NSLog(#"Phone = %#", phone);
NSLog(#"Fax = %#", fax);
}
}
});
[activity stopAnimating];
self.activity.hidden = YES;
}
Image will give you where the error is. I get this error after clicking stepover to debug. I also tried
NSString *address1 = [jsonDictionary objectForKey:#"Address1"];
From the output of url, it shows it's not array but a dictionary. You are trying to convert to array here.
NSArray *myJsonArray = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
instead use this
NSDictionary *myJsonDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
then remove that for loop no need of it. and replace your variable jsonDictionary with myJsonDictionary so to retrieve values.
// for(NSDictionary *jsonDictionary in myJsonArray)
Run now it will be fine. Worked for me fine
If the output was array of Dictionaries it would have been looked like this with square brackets around.
For Ex: [{"id": "1", "name":"Aaa"}, {"id": "2", "name":"Bbb"}]
If you are not sure of nature of response from url you can check for
the type. For ex:
id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
if ([jsonObject isKindOfClass:[NSArray class]]) {
NSLog(#"its an array!");
NSArray *myJsonArray = (NSArray *)jsonObject;
// Handle Array of Dictionary
for(NSDictionary *jsonDictionary in myJsonArray)
{
NSString *address1 = jsonDictionary[#"Address1"];
//and so on
}
}
else {
NSLog(#"It's Dictionary");
NSDictionary *jsonDictionary = (NSDictionary *)jsonObject;
NSLog(#"jsonDictionary - %#",jsonDictionary);
//Handle NSDictionary
}
jsonDictonary is a NSString not as you expect NSDictonary.
Double check your JSON and maybe before calling that function check if it's NSDictonary.
Your should use one of the semi-standard frameworks for parsing JSON into Core Data. There are some SO questions about those.
In this case, your JSON has only one object which is not an array.
In general, your app shouldn't abort if server sent something unexpected, so it's better to use a parser which will loudly complain about malformed JSON than with it from scratch.
I'm having some trouble getting to the data I want to in the JSON file. Here is a shortened version of the output from my console:
{
AUD = {
15m = "125.15547";
24h = "124.74";
buy = "121.0177";
last = "125.15547";
sell = "123.44883";
symbol = "$";
};
BRL = {
15m = "120.34";
24h = "120.34";
buy = "120.34";
last = "120.34";
sell = "120.34";
symbol = "R$";
};
CAD = {
15m = "129.08612";
24h = "131.07";
buy = "128.66227";
last = "129.08612";
sell = "129.08612";
symbol = "$";
};
}
I'm trying to parse the file using the built in JSON parsing library. Here is the parser in my viewDidLoad method:
_tickerArray = [NSMutableArray array];
NSURL *tickerDataURL = [NSURL URLWithString:#"https://blockchain.info/ticker"];
NSData *jsonData = [NSData dataWithContentsOfURL:tickerDataURL];
NSError *error = nil;
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
NSLog(#"%#", dataDictionary);
NSArray *ar = [NSArray arrayWithObject:dataDictionary];
for (NSString *key in [dataDictionary allKeys]) {
for (NSDictionary *dict in ar) {
TickerData *t;
t.currency = [dict objectForKey:key];
t.symbol = [dict objectForKey:#"symbol"];
t.last = [dict objectForKey:#"last"];
[_tickerArray addObject:t];
}
}
I want to store the currency code (like AUD or BRL) into t.currency along with some of the other data contained in the currency dictionary but now my app is crashing.
Error code:
NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil
None of the objects seem to get added to the _tickerArray
Help?
EDIT: Getting the keys to display with the proper data populating other fields:
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
NSLog(#"%#", dataDictionary);
for (NSString *key in [dataDictionary allKeys]) {
NSDictionary *dic=[dataDictionary objectForKey:key];
TickerData *t=[[TickerData alloc] init];
t.currency = key;//EDITED
t.symbol = [dic objectForKey:#"symbol"];
t.last = [dic objectForKey:#"last"];
[_tickerArray addObject:t];
}
t is nil, you have to alloc/ init it:
TickerData *t = [[TickerData alloc] init];
NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
NSLog(#"%#", dataDictionary);
//NSArray *ar = [NSArray arrayWithObject:dataDictionary];//REMOVED
for (NSString *key in [dataDictionary allKeys]) {
NSDictionary *dic=[dataDictionary objectForKey:key];//ADDED
for (NSString *dickey in [dic allKeys]) { //MODIFIED
NSDictionary *dict=[dic objectForKey:dicKey];//ADDED
TickerData *t=[[TickerData alloc] init];//ALLOC INIT ?
t.currency = key;//EDITED
t.symbol = [dict objectForKey:#"symbol"];
t.last = [dict objectForKey:#"last"];
[_tickerArray addObject:t];
}
}
Your data doesn't contain any array, its all dictionaries, try the above code see comments too..
Hope it works..
Edited:
Yes you have initialize the object too, as suggested above in other answers..
Try it....
NSURL *url = [NSURL URLWithString:#"https://blockchain.info/ticker"];
NSLog(#"API : %#",url);
NSMutableData *jsonData = [NSMutableData dataWithContentsOfURL:url];
NSString *data = [[NSString alloc] initWithBytes: [jsonData mutableBytes] length:[jsonData length] encoding:NSUTF8StringEncoding];
dictionary = [data JSONValue];
NSDictionary *dict = [dictionary objectForKey:#"AUD"];
NSLog(#"%#",dict);
NSString *last = [dict valueForKey:#"last"];
NSLog(#"%#",last);