Convert Raw Data "AnyObject?" to NSData or String

Question

I have been stuck for the last few days on this and have read countless posts here on Stackoverflow and across the web, but am still a little lost. (by the way I am a bit of a newbie in Swift).

i have the following code

Alamofire.request(.GET, "url") .response { (request, response, data, error) in printIn(data)}

This prints out a long string of numbers in the Console, which is perfect, exactly what I need.

However I now would like to iterate through these and get the number at certain index's, so would like to convert this into a string or NSData.

I have tried many different ways but have not yet found how to do this, if somebody could please help me I would be very grateful.

I have tried using

Alamofire.request(.GET, "url")
    .responseString(encoding: NSASCIIStringEncoding) { (request, response, data, error) -> Void in
        println(data)
    }

but this only prints out a jumbled up mess.

many thanks

Chris

Answer 1

You say:

However I now would like to iterate through these and get the number at certain index's, so would like to convert this into a string or NSData.

When you use response, the data parameter actually is a NSData. So just cast the variable to the appropriate type, and you should be in business, e.g.:

Alamofire.request(.GET, urlString)
    .response { (request, response, data, error) in
        if let data = data as? NSData {
            for i in 0 ..< data.length {
                var byte: UInt8!
                data.getBytes(&byte, range: NSMakeRange(i, 1))
                print(String(format: "%02x ", byte))
            }
        }
}

In my example loop, just logging the hex string representation of the byte variable, but it's a numeric value with which you can do whatever you'd like.