UInt8 array not getting converted into byte string

Question

I have a function like this in android project

override fun send(data: ByteArray?) {

    if (data == null || data.isEmpty()) {
      warn { "Empty Request" }
      return
    }

    webSocket?.send(ByteString.of(ByteBuffer.wrap(data)))
  }

I have written the equivalent code in swift as

func send(data: [UInt8]?) {
        if(data == nil || data?.count == 0) { return }
        var dataString = String(data: Data(bytes: data!, count: data!.count), encoding : String.Encoding.utf8)!
        if(self.webSocket != nil) {
            self.webSocket!.send(text: dataString)
        }
    }

But I found that my code in swift is breaking when any element of UInt8 array is above 127 ie. anything between 128-255. So how will I achieve the equivalent of Java code in swift.

@JogendarChoudhary how will that help? I am having issue in converting that UInt8 array not with the array itself. — Shubham Agarwal Bhewanewala, Jan 25 '19 at 06:28
Are you sure your data is encoded in UTF8? Can you show some samples of the bytes? — Sweeper, Jan 25 '19 at 06:36
Someone here said anything above 127 is not utf8. and some of my value in array is above 127 — Shubham Agarwal Bhewanewala, Jan 25 '19 at 06:41
Use `.ascii` encoding. What I find suspicious is that you even have to convert byte data to a string to send them over a socket. — Sulthan, Jan 25 '19 at 06:49
Maybe sending the raw bytes instead of a string would help. String creation from raw bytes can fail, and anyway at the end of the day only raw bytes flow through sockets. — Cristik, Jan 25 '19 at 07:44
What is called `ByteString` in `Java`/`JVM` is `Data` in `Swift`/`Cocoa`. You don't need to do anything with `String`, just send `Data`. — user28434'mstep, Jan 31 '19 at 11:58
Possible duplicate of [Unable to convert \[UInt8\] to String. Error: EXC\_BAD\_ACCESS](https://stackoverflow.com/questions/54340302/unable-to-convert-uint8-to-string-error-exc-bad-access) — user28434'mstep, Jan 31 '19 at 12:10

score -2 · Answer 1 · answered Jan 25 '19 at 06:48

-2

I tried using NSString and was able to get a valid string with array elements >127.

Here is my playground code.

import UIKit

var data = [UInt8]()

data.append(0)
data.append(120)
data.append(254)

print(UInt8.max)

print(data)

var dataString =  NSString(bytes: data, length: data.count, encoding: 0)
print(dataString as Any)

Not sure if this is a correct encoded string and will probably cause issues at the other end.

answered Jan 25 '19 at 06:48

humblePilgrim

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Can the person who downvoted please explain the reason too ? so that I too can learn ? – humblePilgrim Jan 27 '19 at 12:18

UInt8 array not getting converted into byte string

1 Answers1