I need to parse a JSON array in the following format:
[
{
name: "10-701 machine learning",
_id: "52537480b97d2d9117000001",
__v: 0,
ctime: "2013-10-08T02:57:04.977Z"
},
{
name: "15-213 computer systems",
_id: "525616b7807f01fa17000001",
__v: 0,
ctime: "2013-10-10T02:53:43.776Z"
}
]
So after getting the NSData, I transfer it to a NSDictionary:
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSLog(#"%#", dict);
But viewing from the console, I think the dictionary is actually like this:
(
{
"__v" = 0;
"_id" = 52537480b97d2d9117000001;
ctime = "2013-10-08T02:57:04.977Z";
name = "10-701 machine learning";
},
{
"__v" = 0;
"_id" = 525616b7807f01fa17000001;
ctime = "2013-10-10T02:53:43.776Z";
name = "15-213 computer systems";
}
)
What do those parenthesis in the outside mean? How should I further transfer this NSDictionary to an NSArray or an NSMutableArray of some Course objects (what I defined myself, try to represent each element of the JSON array)?
Use this code,
NSArray *array = [NSJSONSerialization JSONObjectWithData: responseData options:NSJSONReadingMutableContainers error:&error];
NSDictionary *dict = [array objectAtIndex:0];
Then you can retrieve the values by following code,
NSString *v = [dict objectForKey:#"__v"];
NSString *id = [dict objectForKey:#"_id"];
NSString *ctime = [dict objectForKey:#"ctime"];
NSString *name = [dict objectForKey:#"name"];
The parenthesis are just the result of NSDictionary output format not being exactly the same thing as how JSON is formatted. Your code still successfully converted the JSON into a NSDictionary object.
I think what you really want, though, is an array of dictionaries. Something like this:
NSArray *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSDictionary *firstObject = [json objectAtIndex:0];
After this, firstObject would contain:
{
"__v" = 0;
"_id" = 52537480b97d2d9117000001;
"ctime" = "2013-10-08T02:57:04.977Z";
"name" = "10-701 machine learning";
}
And you can retrieve the information with objectForKey:
NSString *time = [firstObject objectForKey:#"ctime"];
// time = "2013-10-08T02:57:04.977Z"
Hope that helps.
Related
Can anybody help me create an NSDictionary format of the following structure:
{
key1 = "value1";
key2 = "value2";
key3 = [
{
key01 = "value01";
key02 = "value02";
},
{
key01 = "value01";
key02 = "value02";
},
{
key01 = "value01";
key02 = "value02";
}
];
}
Try this code it might help you.
NSDictionary *dicationary = #{
#"key1":#"value1",
#"key2":#"value2",
#"key3":#[#{#"key01":#"value01",#"key02":#"value02"},
#{#"key01":#"value01",#"key02":#"value02"},
#{#"key01":#"value01",#"key02":#"value02"}]
};
There is API in obj-c to convert Json to nsdictionary .I guess you should try that :
First convert json to nsdata (assuming you above JSON is in string format)
2.Then you API to convert that to NSDictionary :
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
Just to answer your question about converting that JSON data to NSDictionary, here it is:
(assuming you already got your JSON data)
// add the first 2 VALUES with it's KEYS
NSMutableDictionary *mainDict = [NSMutableDictionary dictionary];
[mainDict setValue:VALUE1 forKey:KEY1];
[mainDict setValue:VALUE2 forKey:KEY2];
// then for the last KEY, create a mutable array where you will store your sub dictionaries
NSMutableArray *ma = [NSMutableArray array];
NSMutableDictionary *subDict = [NSMutableDictionary dictionary];
[subDict setValue:SUB_VALUE1 forKey:SUB_KEY1];
[subDict setValue:SUB_VALUE1 forKey:SUB_KEY2];
[ma addObject:subDict];
// then add that array to your main dictionary
[mainDict setValue:ma forKey:KEY3];
// check the output
NSLog(#"mainDict : %#", mainDict);
// SAMPLE DATA - Test this if this is what you want
NSMutableDictionary *mainDict = [NSMutableDictionary dictionary];
[mainDict setValue:#"value1" forKey:#"key1"];
[mainDict setValue:#"value2" forKey:#"key2"];
NSMutableArray *ma = [NSMutableArray array];
NSMutableDictionary *subDict = [NSMutableDictionary dictionary];
[subDict setValue:#"subValue1" forKey:#"subKey1"];
[subDict setValue:#"subValue2" forKey:#"subKey2"];
[ma addObject:subDict];
[mainDict setValue:ma forKey:#"key3"];
NSLog(#"mainDict : %#", mainDict);
The following should work for you:
NSString *jsonString = #"{\"ID\":{\"Content\":268,\"type\":\"text\"}}";
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(#"%#", jsonDict[#"ID"][#"Content"]);
Will return you:
268
I am trying store text fields data into a NSDictionary from json. I have used SBJson for this.
{
"fields":[
{
"textFields":[
{
"text":"Congratulations",
"textSize":"12"
},
{
"text":"Best Wishes",
"textSize":"15"
},
{
"text":"Test text",
"textSize":"10"
}
]
},
{
"imageFields":[
{
"image":"test1.jpg",
"width":"200",
"height":"100"
},
{
"image":"test2.jpg",
"width":"200",
"height":"100"
}
]
}
]
}
My code:
-(void)readJson{
NSDictionary *jsonDict = [jsonString JSONValue];
NSDictionary *fieldsDict =[jsonDict valueForKey:#"fields"];
NSDictionary *textFieldsDict = [fieldsDict valueForKey:#"textFields"];
NSLog(#" Dictionary %# ",textFieldsDict );
}
But its output as follows.
Dictionary (
(
{
text = Congratulations;
textSize = 12;
},
{
text = "Best Wishes";
textSize = 15;
},
{
text = "Test text";
textSize = 10;
}
),
"<null>"
)
It seems like there are two items in dictionary and one is null. I wanted to put three textfield items into the array. How can i solve this.
Don't use SBJSON. Use NSJSONSerialization.
Don't use valueForKey:, use objectForKey:.
You are mixing up dictionaries and arrays. Don't do that. Use NSArray for arrays.
I am revising your code for better understanding
-(void)readJson
{
NSDictionary *jsonDict = [jsonString JSONValue];
NSDictionary *fieldsDict =[jsonDict valueForKey:#"fields"];
NSDictionary *textFieldsDict = [fieldsDict valueForKey:#"textFields"];
NSLog(#" Dictionary %# ",textFieldsDict );
}
More appropriate way is
-(void)readJson
{
NSDictionary *jsonDict = [jsonString JSONValue];
NSArray *fieldsArr =[jsonDict objectForKey:#"fields"];
for(int i=0;i<[fieldArr count];i++)
{
NSArray *textFieldArr = [fieldArr objectAtIndex: i];
for(int j=0;j<[textFieldArr count];j++)
{
NSDictionary *dicTextField = [textFieldArr objectAtIndex: j];
NSString *text = [dicTextField objectForKey: #"text"];
NSString *textSize = [dicTextField objectForKey: #"textSize"];
}
}
}
For quick help
treat { as dictionary and [ as array.
Hope, i am helpful to you.
As your json format, [jsonDict valueForKey:#"fields"] will return an array not dictionary so your code must be
NSDictionary *jsonDict = [jsonString JSONValue];
NSArray *fields = [jsonDict objectForKey:#"fields"];
NSDictionary *fieldsDict = fields[0];
NSArray *textFieldsDict = [fieldsDict objectForKey:#"textFields"];
I have corrected the json format and used NSJSONSerialization,
{"fields":
{"textFields":
[ {"text":"Congratulations", "textSize":"12"},
{"text":"Best Wishes", "textSize":"15"},
{"text":"Test text", "textSize":"10"}
],
"imageFields":
[ {"image":"test1.jpg","width":"200", "height":"100"},
{"image":"test2.jpg", "width":"200", "height":"100"}
]
}
}
-(void)readJson
NSError *e = nil;
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&e];
NSDictionary *fields = [jsonDict objectForKey:#"fields"];
NSArray *textArray=[fields objectForKey:#"textFields"] ;
NSLog(#"--- %#",textArray );
}
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"];
I get this JSON from a web service:
{
"Respons": [{
"status": "101",
"uid": "0"
}]
}
I have tried to access the data with the following:
NSError* error;
//Response is a NSArray declared in header file.
self.response = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSString *test = [[self.response objectAtIndex:0] objectForKey:#"status"]; //[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance
NSString *test = [[self.response objectForKey:#"status"] objectAtIndex:0]; //(null)
But none of them work, if i NSLog the NSArray holding the serialized data, this i what i get:
{
Respons = (
{
status = 105;
uid = 0;
}
);
}
How do i access the data?
Your JSON represents a dictionary, for whom the value associated with the Respons key is an array. And that array has a single object, itself a dictionary. And that dictionary has two keys, status and uid.
So, for example, if you wanted to extract the status, I believe you need:
NSArray *array = [self.response objectForKey:#"Respons"];
NSDictionary *dictionary = [array objectAtIndex:0];
NSString *status = [dictionary objectForKey:#"status"];
Or, in latest versions of the compiler:
NSArray *array = self.response[#"Respons"];
NSDictionary *dictionary = array[0];
NSString *status = dictionary[#"status"];
Or, more concisely:
NSString *status = self.response[#"Respons"][0][#"status"];
Your top level object isn't an array, it's a dictionary. You can easily bypass this and add the contents of that key to your array.
self.response = [[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error] objectForKey:#"Respons"];
I'm trying to get values from nsdata class and doesn't work.
here is my JSON data.
{
"count": 3,
"item": [{
"id": "1",
"latitude": "37.556811",
"longitude": "126.922015",
"imgUrl": "http://175.211.62.15/sample_res/1.jpg",
"found": false
}, {
"id": "3",
"latitude": "37.556203",
"longitude": "126.922629",
"imgUrl": "http://175.211.62.15/sample_res/3.jpg",
"found": false
}, {
"id": "2",
"latitude": "37.556985",
"longitude": "126.92286",
"imgUrl": "http://175.211.62.15/sample_res/2.jpg",
"found": false
}]
}
and here is my code
-(NSDictionary *)getDataFromItemList
{
NSData *dataBody = [[NSData alloc] initWithBytes:buffer length:sizeof(buffer)];
NSDictionary *iTem = [[NSDictionary alloc]init];
iTem = [NSJSONSerialization JSONObjectWithData:dataBody options:NSJSONReadingMutableContainers error:nil];
NSLog(#"id = %#",[iTem objectForKey:#"id"]);
//for Test
output = [[NSString alloc] initWithBytes:buffer length:rangeHeader.length encoding:NSUTF8StringEncoding];
NSLog(#"%#",output);
return iTem;
}
how can I access every value in the JSON? Please help me.
look like this ..
NSString *jsonString = #"your json";
NSData *JSONdata = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSError *jsonError = nil;
if (JSONdata != nil) {
//this you need to know json root is NSDictionary or NSArray , you smaple is NSDictionary
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:JSONdata options:0 error:&jsonError];
if (jsonError == nil) {
//every need check value is null or not , json null like ( "count": null )
if (dic == (NSDictionary *)[NSNull null]) {
return nil;
}
//every property you must know , what type is
if ([dic objectForKey:#"count"] != [NSNull null]) {
[self setCount:[[dic objectForKey:#"count"] integerValue]];
}
if ([dic objectForKey:#"item"] != [NSNull null]) {
NSArray *itemArray = [dic objectForKey:#"item"]; // check null if need
for (NSDictionary *itemDic in itemArray){
NSString *_id = [dic objectForKey:#"id"]; // check null if need
NSNumber *found = (NSNumber *)[dic objectForKey:#"found"];
//.....
//.... just Dictionary get key value
}
}
}
}
I did it by using the framework : http://stig.github.com/json-framework/
It is very powerfull and can do incredible stuff !
Here how I use it to extract an item name from an HTTP request :
(where result is the JSO string)
NSString *result = request.responseString;
jsonArray = (NSArray*)[result JSONValue]; /* Convert the response into an array */
NSDictionary *jsonDict = [jsonArray objectAtIndex:0];
/* grabs information and display them in the labels*/
name = [jsonDict objectForKey:#"wine_name"];
Hope this will be helpfull
Looking at your JSON, you are not querying the right object in the object hierarchy. The top object, which you extract correctly, is an NSDictionary. To get at the items array, and the single items, you have to do this.
NSArray *items = [iTem objectForKey:#"item"];
NSArray *filteredArray = [items filteredArrayUsingPredicate:
[NSPredicate predicateWithFormat:#"id = %d", 2];
if (filteredArray.count) NSDictionary *item2 = [filteredArray objectAtIndex:0];
Try JSONKit for this. Is is extremely simple to use.
Note sure if this is still relevant, but in iOS 5, apple added reasonable support for JSON. Check out this blog for a small Tutorial
There is no need to import any JSON framework. (+1 if this answer is relevant)