TCP socket connection using CFStreamCreatePairWithSocketToHost not Working - ios

Question

I am new to swift Programming. I am trying to connect to a server socket from my ios app. I have a View controller and in a button action I am calling the function to connect to the socket server
let socketConn = Connection();
socketConn.connect();
I have set the delegate to self in the Connection class, but my stream function is not triggered after connecting to the server socket.
class Connection : NSObject, NSStreamDelegate {
let serverAddress: CFString = "192.168.1.104"
let serverPort: UInt32 = 5012
private var inputStream: NSInputStream!
private var outputStream: NSOutputStream!
func connect() {
println("connecting...")
var readStream: Unmanaged<CFReadStream>?
var writeStream: Unmanaged<CFWriteStream>?
CFStreamCreatePairWithSocketToHost(nil, self.serverAddress, self.serverPort, &readStream, &writeStream)
self.inputStream = readStream!.takeRetainedValue()
self.outputStream = writeStream!.takeRetainedValue()
self.inputStream.delegate = self
self.outputStream.delegate = self
self.inputStream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
self.outputStream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
self.inputStream.open()
self.outputStream.open()
}
func stream(stream: NSStream, handleEvent eventCode: NSStreamEvent) {
println("stream event")
}
}
Can anyone help me how to debug it on why the stream function is called on connection ?

Answer 1

I am using getStreamsToHostWithName function of NSStream class. It is more easy and beeter than CFStreamCreatePairWithSocketToHost
func initNetworkCommunication() {
print("connecting...")
let serverAddress = "gzoa.vps.infomaniak.com"
let serverPort = 1234
NSStream.getStreamsToHostWithName(serverAddress, port: serverPort, inputStream: &inputStream, outputStream: &outputStream)
self.inputStream!.delegate = self
self.outputStream!.delegate = self
self.inputStream!.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
self.outputStream!.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
self.inputStream!.open()
self.outputStream!.open()
}

Answer 2

You can use this
import Foundation
typealias OnComing = (String!) -> (Void)
class SocketClient: NSObject, StreamDelegate {
var host:String?
var port:Int?
var inputStream: InputStream?
var outputStream: OutputStream?
var status = false;
var output = ""
var bufferSize = 1024;
var onComing:OnComing!
func makeCFStreamConnection(host: String, port: Int, onComing:#escaping OnComing) {
self.host = host
self.port = port
self.onComing = onComing
Stream.getStreamsToHost(withName: host, port: port, inputStream: &self.inputStream, outputStream: &self.outputStream)
if self.inputStream != nil && self.outputStream != nil {
self.inputStream!.delegate = self
self.outputStream!.delegate = self
self.inputStream!.schedule(in: .main, forMode: RunLoopMode.defaultRunLoopMode)
self.outputStream!.schedule(in: .main, forMode: RunLoopMode.defaultRunLoopMode)
self.inputStream!.open()
self.outputStream!.open()
}
}
func stream(_ aStream: Stream, handle eventCode: Stream.Event) {
if aStream === self.inputStream {
switch eventCode {
case Stream.Event.errorOccurred:
break
case Stream.Event.openCompleted:
break
case Stream.Event.hasBytesAvailable:
read()
break
default:
break
}
} else if aStream === self.outputStream {
switch eventCode {
case Stream.Event.errorOccurred:
break
case Stream.Event.openCompleted:
break
case Stream.Event.hasSpaceAvailable:
break
default:
break
}
}
}
func read() {
output = ""
var buffer = [UInt8](repeating: 0, count: bufferSize)
while (self.inputStream!.hasBytesAvailable) {
let bytesRead: Int = inputStream!.read(&buffer, maxLength: buffer.count)
if bytesRead >= 0 {
output += NSString(bytes: UnsafePointer(buffer), length: bytesRead, encoding: String.Encoding.ascii.rawValue)! as String
} else {
print("# Stream read() error")
}
}
self.onComing(output)
}
func write(message:String) {
let encodedDataArray = [UInt8]("\(message)\n".utf8)
self.outputStream?.write(encodedDataArray, maxLength: encodedDataArray.count)
}
}