String Array to Int8 Array byte TypeCasting

Question

The code which i am using but it shows an error of cannot invoke initializer for type array with argument list of string.utf8view

Help me to convert a string to signed int byte array

 static func stringToByteArray(string : String)-> Array<Int8> 
  {
        let array: [Int8] = Array(string.utf8)
        //print("string array \(array)")
        return array

    }

Possible duplicate of stackoverflow.com/questions/30255402/… — ridvankucuk
– ridvankucuk, Commented May 5, 2016 at 4:53
yes i am using that same code but it is for UInt8, i need it for Int8 byte array conversion — Nisha Nair
– Nisha Nair, Commented May 5, 2016 at 4:56

Himanshu · Accepted Answer · 2016-05-05 06:00:14Z

2

Use this method that firstly convert your array to unsigned integer then to signed array as there is no method to typecast unsigned array to signed array directly.

 func stringToByteArray(string : String)-> Array<Int8>
    {
        let array: [UInt8] = Array(string.utf8)
        var arraySigned = [Int8]()
        var convertSigned: Int8!
        for element in array
        {
            convertSigned = Int8(bitPattern: element)
            arraySigned.append(convertSigned)
        }

        print("string array \(arraySigned)")
        return arraySigned

    }

answered May 5, 2016 at 6:00

Himanshu

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2 Comments

Martin R Over a year ago

@NishaNair: Don't forget to accept helpful answers!

Martin R Over a year ago

Simpler: let arraySigned = string.utf8.map { Int8(bitPattern: $0) }

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