I'm primarily a c# developer but I have been tasked with resolving a bug in an objective-c mac client. I am using nsjsonserialization to serialize the json object.
The bug occurs on deserialization if the json object contains the copyright symbol.
We were using sbjson and I switched to nsjsonserialization and that didn't resolve the issue. I don't know if I am doing it wrong or if I need to use a different serialization library. In c# I could just use newtonsoft. Is there a similarly standard json serialization library for objective-c that I should use?
Here is the serialization code:
-(void)sendMessage:(NSString *)method:(NSDictionary *)inData {
NSDictionary *outData = [[NSDictionary alloc] init];
#try {
JsonServiceComm *newCom = [[JsonServiceComm alloc] init];
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"%#/%#", host, method]];
NSData *json = [NSJSONSerialization dataWithJSONObject:inData options:kNilOptions error:nil];
json = [json subdataWithRange:NSMakeRange(0, [json length] - 1)];
NSString* jsData = [NSString stringWithUTF8String:[json bytes]];
NSString *outData = [newCom userSpaceRequest:url :jsData];
} #catch (NSException* ex) {
NSLog(#"%#", [ex reason]);
}
}
Here is where it is being deserialized:
-(void)handleMessage:(NSString *)messageType message:(NSString *)message {
#autoreleasepool {
NSData *jsMessage = [message dataUsingEncoding:NSUTF8StringEncoding];
NSError *error;
NSDictionary *data = [NSJSONSerialization JSONObjectWithData:jsMessage options:NSJSONReadingMutableLeaves error:&error];
}}
If the data does not contain a copyright symbol, *data is populated with a dictionary of values, however if it does contain the copyright symbol, *data comes out nil. The error returned is "Unexpected end of file while parsing object."
This is resolved. I discovered that the json was being passed through a separate json parser where it was not being utf8 encoded.
Try using options:0 instead of options:NSJSONReadingMutableLeaves
https://developer.apple.com/documentation/foundation/nsjsonreadingoptions/nsjsonreadingmutableleaves?language=objc
Related
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 am parsing and NSString value but getting null in console. Please help me with the issue.
NSString *responseData = [[NSString alloc] initWithData:_responseData encoding:NSASCIIStringEncoding];
NSLog(#"Data: %#", responseData);
NSData *data = [responseData dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSDictionary *res = [json objectForKey:#"demo"];
NSLog(#"res is %#",res);
I was having a similar problem in one of my projects. I was trying to create NSString from NSData(response from webservice) and i was getting a nil. I found out that using NSASCIIStringEncoding when creating the String solved my problem. It turns out that even though UTF8 has all ASCII chars, char * may not line up correctly for certain characters and by default the init methods do nonlossy encoding which means that nil gets returned when an unexpected char is encountered.
For your case this could be your code.
NSString *responseData = [[NSString alloc] initWithData:_responseData encoding:NSASCIIStringEncoding];
NSLog(#"Data: %#", responseData);
NSData *data = [responseData dataUsingEncoding:NSASCIIStringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSDictionary *res = [json objectForKey:#"demo"];
NSLog(#"res is %#",res);
NOTE: I am not sure why you are doing all the _responseData->data conversion. If you are doing that just to deserialize your _responseData to json object, you could use it directly in NSJSONSerialization. As below.
id json = [NSJSONSerialization JSONObjectWithData:_responseData options:0 error:nil];
For more information check out this link.
Maybe error appear because you using different encoding? Try using NSUTF8StringEncoding in NSString and in NSData.
From NSString class reference:
-initWithData:encoding:
Return Value
An NSString object initialized by converting the bytes in data into Unicode characters using encoding. The returned
object may be different from the original receiver. Returns nil if the
initialization fails for some reason (for example if data does not
represent valid data for encoding).
Where are you getting _responseData from? Is it definitely an NSDataobject?
Are you sure that you are using the correct encoding?
Could you print out _responseData and update your question so we can take a look?
I have this problem in this method that uses json in xcode.(My xcode version is 5)
This is the statement with the error:
NSDictionary * dict = [[CJSONDeserializer deserializer] deserializeAsDictionary:jsonData error:&error];
The error: Use of undeclared identifier 'CJSONDeserializer'. but I already did declare this class in the project, so what I can do???
PLEASE HELP ME I REALLY NEED TO SOLVE THIS PROBLEM ASAP.
This is all the method.
- (void) viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSURL *url = [NSURL URLWithString:#"http://localhost:8888/json.php"]; // Modify this to match your url.
NSString *jsonreturn = [[NSString alloc] initWithContentsOfURL:url]; // Pulls the URL
NSLog(jsonreturn); // Look at the console and you can see what the restults are
NSData *jsonData = [jsonreturn dataUsingEncoding:NSUTF32BigEndianStringEncoding];
NSError *error = nil;
// In "real" code you should surround this with try and catch
#try {
NSDictionary * dict = [[CJSONDeserializer deserializer] deserializeAsDictionary:jsonData error:&error];
if (dict)
{
rows = [[dict objectForKey:#"user"] retain];
}
NSLog(#"Array: %#",rows);
[jsonreturn release];
}
}
That's part of the TouchJSON library. You should make sure you've included that library in your project. Also make sure you have imported the appropriate header at the top of your .m file:
#import "CJSONDeserializer.h"
Or change your code to use the built in NSJSONSerialization, e.g. replace the line that says:
NSDictionary * dict = [[CJSONDeserializer deserializer] deserializeAsDictionary:jsonData error:&error];
With one that says:
NSDictionary * dict = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];
I am trying to parse some Json with Objective C.
My problem is that I am getting the correct json back but when I try parse some of the json my app crashes.
// i will use a code from connect to DB tutorial
NSString *strURL = [NSString stringWithFormat:#"http://www.ddproam.co.za/Central/Asset/AssetsWithSerial?Serial=S00000001"];
// to execute php code
NSData *dataURL = [NSData dataWithContentsOfURL:[NSURL URLWithString:strURL]];
// to receive the returend value
NSString *strResult = [[NSString alloc] initWithData:dataURL encoding:NSUTF8StringEncoding];
NSLog(#"Login response:%#",strResult);
NSError *error;
//parse out the json data
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:dataURL //1
options:kNilOptions
error:&error];
NSArray* defineJsonData = [json objectForKey:#"AssetDesc"]; //2
NSLog(#"value: %#", defineJsonData); //3
Here is my json:
[{"AssetID":1,"AssetName":"Asset 1","AssetDesc":"This is a manually inserted Asset","AssetTypeID":1,"AssetTypeDesc":"This is a manually inserted Asset Type"}]
I am trying to get the AssestName out of the string. I must be doing something wrong.
The whole thing is an array containing a dictionary, not a dictionary containing an array...
This is a very dirty way to get the value you want - you want to write something more safe than this. Try checking the type of class returned before you try to use it...
NSArray* json = [NSJSONSerialization JSONObjectWithData:dataURL //1
options:kNilOptions
error:&error];
NSDictionary* defineJsonData = [json lastObject]; //2
NSLog(#"value: %#", [defineJsonData objectForKey:#"AssetDesc"]); //3
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.