I want to split the json part from this URL in my iPhone application.
http://vkontakte.ru/login_success.html#session={"expire":"1272008089","mid":"100172","secret":"9c8d8f0305","sid":"1131703552161ae352a1256402e3140d7cbde41b1602a93d15472c82"}
I tried and and saved the JSON into a NSString but what i am getting is
http://vkontakte.ru/api/login_success.html?session=%7B%22mid%22:113158415,%22secret%22:%227ce58bfcd3%22,%22sid%22:%2203831b43c1bb992f9477efbfe96e83f6ecff1c1b661315ac0a20719cf57a44%22,%22expire%22:0%7D
This is not coming in JSOn Format. Below is my code
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
NSURL *url = [request URL];
NSError* error;
NSLog (#"json path %#",url);
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSURLRequest *request1 = [NSURLRequest requestWithURL:url];
NSString *json_string = [url absoluteString];
NSArray *arr = [json_string componentsSeparatedByString:#"="];
json_string = [arr objectAtIndex:1];
// parse the JSON response into an object
// Here we're using NSArray since we're parsing an array of JSON status objects
NSArray *statuses = [json_string JSONValue];
NSLog(#"%#",error);
// Each element in statuses is a single status
// represented as a NSDictionary
for (NSDictionary *status in statuses)
{
// You can retrieve individual values using objectForKey on the status NSDictionary
// This will print the tweet and username to the console
NSLog(#"%# - %#", [status objectForKey:#"secret "], [[status objectForKey:#"mid"] objectForKey:#"sid"]);
}
return YES;
}
How can move further?
Try replacing:
NSString *json_string = [url absoluteString];
with
NSString *json_string = [[url absoluteString] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];.
That's a really strange thing you're doing, though. Why does the URL have JSON in it?
Related
I am writing an application to authorise itself into Spotify. I used the node app.js example to get things working and an now re-writing natively into Objective C. I have extracted the authorisation code via a callback function
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"https://accounts.spotify.com/api/token"]];
request.HTTPMethod = #"POST";
// put in the header fields
NSString *headerString = [NSString stringWithFormat:#"%#:%#",clientID,clientSecret];
NSData *nsdata = [headerString dataUsingEncoding:NSUTF8StringEncoding];
NSString *base64Encoded = [nsdata base64EncodedStringWithOptions:0];
base64Encoded = [ NSString stringWithFormat:#"Basic %#", base64Encoded];
[request setValue:base64Encoded forHTTPHeaderField:#"Authorization"];
NSLog(#"request.header %#", request.allHTTPHeaderFields.description);
// put in the body form
NSString * stringData = [NSString stringWithFormat:#"grant_type:%#, code:%#, redirect_uri:\"%#\"", #"authorization_code",authorisationCode,redirectUri];
NSData * requestBodyData = [stringData dataUsingEncoding:NSUTF8StringEncoding];
request.HTTPBody = requestBodyData;
NSLog(#"request.body %#", [[NSString alloc] initWithData:request.HTTPBody encoding:NSUTF8StringEncoding]);
I then post this request and get
{"error":"server_error","error_description":"Unexpected status: 415"}
returned.
I have found a variety of questions on this topic revolving around the Content-Type needing to be application/x-www-form-urlencoded but this was no direct cure.
Anyone got any suggestions for me?
I found the answer here NSURLRequest : Post data and read the posted page
It appears that the raw data within the HTTPBody needs to be formatted differently - no JSON at all. The above link has a useful function which I updated slightly
-(NSData*)encodeDictionary:(NSDictionary*)dictionary {
NSMutableArray *parts = [[NSMutableArray alloc] init];
for (NSString *key in dictionary) {
NSString *encodedValue = [[dictionary objectForKey:key] stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLPasswordAllowedCharacterSet]];
NSString *encodedKey = [key stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLPasswordAllowedCharacterSet]];
NSString *part = [NSString stringWithFormat: #"%#=%#", encodedKey, encodedValue];
[parts addObject:part];
}
NSString *encodedDictionary = [parts componentsJoinedByString:#"&"];
return [encodedDictionary dataUsingEncoding:NSUTF8StringEncoding];
}
and ..
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
//NSLog(#"request.header %#", request.allHTTPHeaderFields.description);
// put in the body form using the new function
NSDictionary * parameters = [[NSDictionary alloc] initWithObjectsAndKeys:#"authorization_code",#"grant_type",authorisationCode,#"code",redirectUri,#"redirect_uri", nil ];
NSData * requestBodyData = [self encodeDictionary:parameters];
request.HTTPBody = requestBodyData;
I use openweathermap API to print current weather. I need to parse this JSON (JSON with available cities). I tried to parse it with NSJSONSerializer, but the answer was :"error NSError * domain: #"NSCocoaErrorDomain" - code: 3840".
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"city.list" ofType:#"json"];
NSString *myJSON = [[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
NSError *error;
NSData *objectData = [myJSON dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:objectData options:NSJSONReadingMutableContainers error:&error];
As i understand, error 3840 says about wrong JSON format, but i have downloaded JSON from official openweathermap page. What's wrong? How parse this JSON correctly?
The file is no valid JSON, but a list of valid JSONs.
{"_id":707860,"name":"Hurzuf","country":"UA","coord":{"lon":34.283333,"lat":44.549999}}
{"_id":519188,"name":"Novinki","country":"RU","coord":{"lon":37.666668,"lat":55.683334}}
{"_id":1283378,"name":"Gorkhā","country":"NP","coord":{"lon":84.633331,"lat":28}}
…
Such a list in a valid JSON would look like this …:
[
{"_id":707860,"name":"Hurzuf","country":"UA","coord":{"lon":34.283333,"lat":44.549999}},
{"_id":519188,"name":"Novinki","country":"RU","coord":{"lon":37.666668,"lat":55.683334}},
{"_id":1283378,"name":"Gorkhā","country":"NP","coord":{"lon":84.633331,"lat":28}},
…
]
… or like this …
{
{"707860": {"name":"Hurzuf","country":"UA","coord":{"lon":34.283333,"lat":44.549999}},
{"519188": {"name":"Novinki","country":"RU","coord":{"lon":37.666668,"lat":55.683334}},
{"1283378":{"name":"Gorkhā","country":"NP","coord":{"lon":84.633331,"lat":28}},
…
However, what you can do is to iterate over the list and convert it item separately:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"city.list" ofType:#"json"];
NSString *myList = [[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
// Separate the lines
NSArray *myItems = [myList componentsSeperatedByCharactersInSet:[NSCharacterSet newLineCharacterSet];
NSError *error;
for( NSString *JSON in myItems )
{
if( [JSON length]==0)
{
// empty line
continue;
}
NSData *objectData = [JSON dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *object = [NSJSONSerialization JSONObjectWithData:objectData options:NSJSONReadingMutableContainers error:&error];
if( object == nil )
{
NSLog( #"Error %# reading\n%#", error, JSON);
}
}
Your json is not formatted correctly.
{"_id":707860,"name":"Hurzuf","country":"UA","coord":{"lon":34.283333,"lat":44.549999}}
{"_id":519188,"name":"Novinki","country":"RU","coord":{"lon":37.666668,"lat":55.683334}}
should be
[{"_id":707860,"name":"Hurzuf","country":"UA","coord":{"lon":34.283333,"lat":44.549999}},
{"_id":519188,"name":"Novinki","country":"RU","coord":{"lon":37.666668,"lat":55.683334}},
...]
Note the encapsulating square brackets and commas at the end.
Or you could parse the text line-by-line (it seems it is ment to be parsed like that).
I have made this so far. It's code that will make a json String request with an http Header. When i run this code i get no errors. But i get a Expression result unused warning. I should get a response from the web service after sending this http header.
code:
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *nid = #"";
NSString *vocab = #"";
NSString *inturl = #"testoverview";
NSString *mail = #"chh#fbr.dk";
NSString *md5pw = #"4d57e7ef1b7c3f431aca424764e9d786";
NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
nid, #"nid",
vocab, #"vocab",
inturl, #"inturl",
mail, #"mail",
md5pw, #"md5pw",nil];
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
if (!jsonData) {
NSLog(#"Got an error; %#", error);
} else if(jsonData) {
NSString *url = #"http://www.taenk.dk/services/mobile";
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url] cachePolicy:NSURLCacheStorageAllowed timeoutInterval:30.0];
[request setValue:jsonString forHTTPHeaderField:#"X-FBR-App"];
[[NSURLConnection alloc] initWithRequest:request delegate:self]; <-- this line triggers the warning: "Expression result unused"
NSLog(#"jsonString %#", jsonString);
}
Can anybody clarify 2 things for me:
Does this trigger a response as soon as the request to the web service?
If yes, how do i print this result out?
You need to assign the result to a variable like
NSURLConnection *con = [[NSURLConnection alloc] initWithRequest:...
for later use (e.g. [con cancel];)
Then you should at least implement the delegate method connection:didFailWithError:. In the class reference I don't see the connection:didFinishLoading... anymore. Can you use the sendSynchronousRequest:returningResponse:error: instead, then you'll have the result, be it positive or negative.
This is how I retrieved the data (this version is without ARC):
- (void) connection :(NSURLConnection *)conn didReceiveData :(NSData *)data {
NSString *msg = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
[self checkAutoMailReply:msg];
[msg release];
}
msg contains the pure response data, no header or such.
So far I've discovered in JSON that everything enclosed in { } are objects (objC : NSDictionary) and anything enclosed in [ ] is an array (objC : NSArray).
I've read and re-read this article about the subject>
How to parse JSON into Objective C - SBJSON
I have a .json file with the data modeled like this:
http://elbee101.com/dummySchedule.json
...and now for the code:
SBJSON *parser = [[SBJSON alloc] init];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://elbee101.com/dummySchedule.json"]];
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
NSDictionary *schedule = [parser objectWithString:json_string error:nil];
NSDictionary *day = [schedule objectForKey:#"day"];
NSArray *myList = [day objectForKey:#"name"];
NSLog(#"myList %#", myList);
NSArray *numLaps = [myList objectAtIndex:0];
NSLog(#"numlaps%# ", numLaps);
I'm getting "myList (null)" and "numlaps (null)" from the above code?!#
The question: Can somebody please set me straight on the ordering of objects and arrays with respect to my json data? I want to drill down the tree so that I can access the 'day name', 'session starttime/endtime/sessionname', 'numlaps' & 'class' but I can't seem to get past the 'day' object/array(?)
What you're referring to as schedule is the object enclosed in the outermost {}. Try this:
NSDictionary *json = [parser objectWithString:json_string error:nil];
NSDictionary *schedule = [json objectForKey:#"schedule"];
Then continue as before.
Also, if you're on iOS 5 you can use the NSJSONSerialization class -- using it is pretty much the same, you might get better performance, and you don't have to worry about the hassles of using a third-party library.
call this where ever u need to parse
NSMutableArray *arr=[[NSMutableArray alloc] init];
arr=[[Headparse getArrayFromUrl:#"http://elbee101.com/dummySchedule.json"] retain];
NSLog(#"%#",[arr description]);
[arr release];
write this method as custom class use when ever you need
+(NSMutableArray *) getArrayFromUrl: (NSString *)actionType
{
NSMutableData *responseData1= [NSMutableData data] ;
responseData1 = [NSMutableData dataWithContentsOfURL:[NSURL URLWithString:actionType]];
// NSLog(#"%#",responseData1);
NSString *responseString1 = [[NSString alloc] initWithData:responseData1 encoding:NSUTF8StringEncoding];
//NSLog(#"REs:-->%#",responseString1);
//[responseData1 release];
responseData1 = nil;
NSMutableArray *responseArray = [[NSMutableArray alloc]init];
responseArray = (NSMutableArray *)[responseString1 JSONValue];
// NSLog(#"ghfchfvghv%#",responseArray);
[responseString1 release];
return responseArray;
}
This is how i use NSJsonSerialization for parsing the json object.
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://elbee101.com/dummySchedule.json"]];
NSError *err;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:data
options:kNilOptions
error:&err]; //
NSDictionary *schedule_dict = [json objectForKey:#"schedule"];
NSArray *days = [schedule_dict objectForKey:#"day"];//Days Array from day Object
NSDictionary *dayOne = [days objectAtIndex:0];
NSDictionary *dayTwo = [days objectAtIndex:1];
NSLog(#"THE DAY ONE : %#",dayOne);
NSLog(#"THE DAY TWO : %#",dayTwo);
Hope this may help you ....Note : If you don't want to go with NSJsonSerailization(consider reading of this) ,but still the parsing of json data like above will applicable in your case too.
I have the following JSON object:
{
"response": {
"status": 200
},
"messages": [
{
"message": {
"user": "value"
"pass": "value",
"url": "value"
}
]
}
}
I am using JSON-Framework (also tried JSON Touch) to parse through this and create a dictionary. I want to access the "message" block and pull out the "user", "pass" and "url" values.
In Obj-C I have the following code:
// Create new SBJSON parser object
SBJSON *parser = [[SBJSON alloc] init];
// Prepare URL request to download statuses from Twitter
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:myURL]];
// Perform request and get JSON back as a NSData object
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
// Get JSON as a NSString from NSData response
NSString *json_string = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
//Print contents of json-string
NSArray *statuses = [parser objectWithString:json_string error:nil];
NSLog(#"Array Contents: %#", [statuses valueForKey:#"messages"]);
NSLog(#"Array Count: %d", [statuses count]);
NSDictionary *results = [json_string JSONValue];
NSArray *tweets = [[results objectForKey:#"messages"] objectForKey:#"message"];
for (NSDictionary *tweet in tweets)
{
NSString *url = [tweet objectForKey:#"url"];
NSLog(#"url is: %#",url);
}
I can pull out "messages" and see all of the "message" blocks, but I am unable to parse deeper and pull out the "user", "pass", and "url".
Solved:
NSArray *tweets = [[results objectForKey:#"messages"] valueForKey:#"message"];
Array({
0=>Dictionary({
response = Array({
0=>Dictionary(Status = 200)
})
}),
1=>Dictionary({
messages = Array({
0=> Dictionary({
message = Array({
0=>Dictionary({
user = value,
pass=value,
url=value
})
})
})
})
})
})
So, to access dictionary for user, pass, url,
nsarray *arr = jsonmainarray;
arr = [[[jsonmainarray objectAtIndex: 1] objectforkey:#"messages"] objectatindex: 0];
nsdictionary *dict = [arr objectatindex: 0];
arr = [dict objectforkey:#"message"];
dict = [arr objectatindex: 0]; // Dictionary with user, pass, url
there is an easier way (in my opinion) to do JSON parsing :)
- (void)loadJSONData:(NSString *)u{
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"http://expandurl.appspot.com/expand?url=%#", u]];
NSData *rawJsonData = [NSData dataWithContentsOfURL:url];
CJSONDeserializer *parser = [CJSONDeserializer new];
NSError *error;
NSDictionary *jsonDictionary = [parser deserializeAsDictionary:rawJsonData error:&error];
[parser release];
NSArray *array = [jsonDictionary objectForKey:#"urls"];
}
All you have to do is to use JSON touch... like Sheehan Alam mention.
Say that you got this line of JSON data:
{
"end_url" = "http://www.youtube.com";
redirects = 0;
"start_url" = "http://www.youtube.com";
status = OK;
urls = (
"http://www.youtube.com"
);
}
then in your JSONDictonary the data can be accessed by doing:
[jsonDictionary objectForKey:#"urls"]; //This will return an Array since URLS is a array
[jsondictionary objectForKey:#"en_url"]; //this will return an NSString since end_url is a string
Hope this help people as much as it helped me =)
sincerely yours
Kristian