Incorrect NSStringEncoding value 0x0000 detected in NSURLRequest

Question

I am getting an error when i try to convert NSData to NSString in Swift

This is my request :

var request = NSURLRequest(URL: url!, cachePolicy: NSURLRequestCachePolicy.ReturnCacheDataElseLoad, timeoutInterval: 200)

I am getting the error here :

        var mydata :NSData = NSURLCache.sharedURLCache().cachedResponseForRequest(request)!.data
        var datastring = NSString(data: mydata, encoding: UInt()) as! String

My both try to get rid of the warning error but didn't work: i increased timeoutInterval to be 200 .

And i tried :

var myinfo = NSString(bytes: mydata.bytes, length: mydata.length, encoding: self.responseEncoding())

func responseEncoding() -> NSStringEncoding {

    return responseEncoding()


}

This solution didn't work for me here : Incorrect NSStringEncoding value 0x0000 detected

Answer 1

UInt() creates an integer with the value zero, so you are effectively calling

var datastring = NSString(data: mydata, encoding: 0) as! String

But 0 is not a valid argument for the encoding parameter, you have to replace it by a valid NSStringEncoding, e.g. NSUTF8StringEncoding.

Note also that the conversion can fail, so you better use optional binding instead of a forced cast:

if let datastring = NSString(data: mydata, encoding: NSUTF8StringEncoding) as? String {

} else {
      // Encoding error ...
}