CODEWITHSUNDEEP
iosjsonswiftrestkit
user3458924
user3458924

Reputation: 105

Invalid type in JSON write (NSConcreteMutableData) in Swift

i calling Rest API in order to call i have some parameters as dictionary format and passing to api at some point i getting crash in conversion son type

here my sample code : 

    let configuration = NSURLSessionConfiguration .defaultSessionConfiguration()
    let session = NSURLSession(configuration: configuration)

    self.profieImage = UIImage(named: "calendar.png")

    let imageData = UIImageJPEGRepresentation(self.profieImage, 1)

    let params = ["fname":"Martin","lname":"Raj","gender":"Male","dob":"1997-9-14","email":"[email protected]","mobileNumber":"00000","pancard":"vvvv","profileImg":imageData!] as Dictionary!

    let urlString = NSString(format:"http://my.api.call");
    print("url string is \(urlString)")
    let request : NSMutableURLRequest = NSMutableURLRequest()
    request.URL = NSURL(string: NSString(format: "%@", urlString)as String)
    request.HTTPMethod = "POST"
    request.timeoutInterval = 30
    request.addValue("mobile", forHTTPHeaderField: "true")
    request.addValue("token", forHTTPHeaderField: "")
    request.HTTPBody  = try! NSJSONSerialization.dataWithJSONObject(params, options: [])



    let dataTask = session.dataTaskWithRequest(request)
        {
            (let data: NSData?, let response: NSURLResponse?, let error: NSError?) -> Void in
            // 1: Check HTTP Response for successful GET request
            guard let httpResponse = response as? NSHTTPURLResponse, receivedData = data
                else {
                    print("error: not a valid http response")
                    return
            }

            switch (httpResponse.statusCode){
            case 200:
                let response = NSString (data: receivedData, encoding: NSUTF8StringEncoding)

                print("response==\(response)")

                default:
                break
            }    
    }

my log prints this statement :

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid type in JSON write (NSConcreteMutableData)'

Upvotes: 0

Views: 1324

Answers (1)

vadian
vadian

Reputation: 285039

The error message is pretty clear:

NSData in JSON is not supported.

For example you could convert the data to a Base-64 encoded string

let imageDataBase64 = imageData!.base64EncodedStringWithOptions([])
let params = ["fname":"Martin","lname":"Raj","gender":"Male","dob":"1997-9-14","email":"[email protected]","mobileNumber":"00000","pancard":"vvvv","profileImg":imageDataBase64]

On the server side you need to decode the string back to NSData

params is a non-optional dictionary (the compiler can infer that), the type casting to implicit unwrapped Dictionary is meaningless and not needed.

Upvotes: 1

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