I'm having trouble converting my NSString of JSON objects to an NSArray.
The NSArray object seems to be null.
Here is my NSString JSON code:
NSString* retrievedStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
This gives me a printout of:
{"image_link":"schedule_tien_nguyen.jpg","start_time":"18:00","end_time":"19:00","viet_performer":"","english_performer":"Tien
Nguyen","viet_event":"","english_event":"Singing","day":0,"stage":0}
....
I tried to convert the NSString to an NSArray using:
NSArray *jsonObject = [NSJSONSerialization JSONObjectWithData:
[retrievedStr dataUsingEncoding:NSUTF8StringEncoding]
options:0 error:&error];
However the printout of the jsonObject is (null)
I have tried the solutions from here:
Converting an NSString of JSON Data to NSArray and How to convert a JSON String into an NSArray? but it's still printing out null.
The error printout states:
"Garbage at end."
I'm not sure what that means?
Try the following to read your JSON response. As others have mentioned, it's a JSON dictionary, not an NSArray. The dictionary may contain arrays, but the object response itself is a dictionary.
NSString* retrievedStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSString *imageLink = (NSString *)[retrievedStr objectForKey:#"image_link"]
NSLog(#"%#", imageLink);
use NSArray *jsonObject = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
Related
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?
How do I get true/false (instead of "true"/"false") in json from a NSDictionary using NSJSONSerialization dataWithJSONObject? What keys should I store in the dictionary to get that?
NSNumber objects containing a BOOL are mapped to JSON "true" and "false".
So just use #YES, #NO, or generally #(someBOOL). For example:
NSDictionary *dict = #{#"this is": #YES};
NSData *data = [NSJSONSerialization dataWithJSONObject:dict options:0 error:NULL];
NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
// {"this is":true}
I'm now parsing with NSJSONSerialization
NSData *jsonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"url"]];
NSError *jsonError = nil;
id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&jsonError];
NSDictionary *jsonDictionary = (NSDictionary *)jsonObject;
[self setTableData:jsonDictionary];
But it won't parse my JSON because of special characters in the JSON like the letter 'ü' when i remove the 'ü' from the JSON it's working correclty. I tried the code above and:
options:utf8...
Does anyone know how i can fix this?
Try using NSString with which you can explicitly specify encoding. Ex:
NSString *string = [NSString stringWithContentsOfURL:webURL encoding:NSUTF8StringEncoding error:&error];
You can then convert the NSString object to NSData and then do the JSON serialisation..
Try to change NSJSONReadingMutableContainers with NSJSONReadingMutableLeaves. This solved me similar problem.
My json response from a URL is:
[
{"status":0,
"id":"26",
"content":"See info field for info",
"time":1347565292761,
"info": {"id":"26",
"name":"Ruti",
"twitterPageFollowers":null,
"facebookPageLikes":null,
"activeEmailClients":1}
}
]
I need to extract from it the following strings:
twitterPageFollowers
facebookPageLikes
activeEmailClients
How can I do it?
I tried parsing like this
NSData *urlData=[NSURLConnection sendSynchronousRequest:serviceRequest returningResponse:nil error:nil ];
NSString *returnString=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
NSData *jsonData = [returnString dataUsingEncoding:NSUTF8StringEncoding];
NSArray *json = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
NSDictionary *response = [json objectAtIndex:0];
NSString *info = [response objectForKey:#"info"];
NSData *businessInfoString = [info dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *businessInfo =
[NSJSONSerialization JSONObjectWithData: businessInfoString
options: NSJSONReadingMutableContainers
error: nil];
And the return data is ok, but I get [__NSCFDictionary dataUsingEncoding:unrecognized selector sent to instance for the last NSDictionary creation from info field.
What is wrong or what is the shorter way to retrieve the above fields?
When you retrieve the "info" field using [response objectForKey:#"info"];, you already get an NSDictionary! (and NOT an NSString).
That's why when you try to call dataUsingEncoding: on this object (that you believed was an NSString but is as NSDictionary) you get the exception.
There is no need to retrieve the value of "info" key then converting it to NSData and converting it back a JSONObject, because it is already a JSONObject, namely an NSDictionary in your case. Why bother trying to convert it back and forth, whereas [response objectForKey:#"info"]; already returns that businessInfo dictionary that you expect at the end of your code?
I have this JSON response string:
{"d":"{\"ID_usuario\":\"000130\",\"Nombre\":null,\"Vipxlo\":0,\"Provmun\":null,\"Descuentos\":null,\"Listaviplocal\":null}"}`
With this code:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
//Check valid signal
connection = nil;
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
//data =nil;
NSArray *jsonArray = [responseString JSONValue];
How can I do it?
When you can afford to require iOS 5 you should try NSJSONSerialization.
Your code could look like this but I suggest reading the Docs first.
NSArray* jsonArray = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableLeaves error:someError]
This JSON should result in a Dictionary
NSDictionary *jsonDict = [responseString JSONValue];
then use:
[jsonDict objectForKey:#"d"];
Try using the SBJasonParser library for iOS.
You can then use this code (for all iOS versions):
SBJsonParser* parser = [[[SBJsonParser alloc] init] autorelease];
NSDictionary* myDict = [parser objectWithString: responseString];
Note: Your code above has a JSON Dictionary but you were trying to access it as an Array.