Closing a connection

Question

stefan12 OP

Created Jul ’15

Replies 1

Boosts 0

Participants 2

Hello,

I am writing an app that connects to a Java-Server.

Declarations at the top of the class:

let ip = "192.168.1.130"
let port = 3333
var inputStream: NSInputStream?
var outputStream: NSOutputStream?

I use this code to connect to the server:

func connect() {
     NSStream.getStreamsToHostWithName(ip, port: port, inputStream: &inputStream, outputStream: &outputStream)
  
     inputStream!.delegate = self
     outputStream!.delegate = self
  
     inputStream!.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
     outputStream!.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
  
     inputStream!.open()
     outputStream!.open()
}

and this to disconnect:

func disconnect() {
     inputStream?.close()
     outputStream?.close()

     inputStream?.removeFromRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
     outputStream?.removeFromRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)

     inputStream = nil
     outputStream = nil
}

connect() is called when the user taps on the connect button

disconnect() is called when the events .ErrorOccurred and .EndEncountered happen or the user taps on the disconnect button.

But the socket seems not be closed because the Java-Server still shows it as open and connected.

In Java i would call

socket.close();

Is there a similar method for iOS?

Thanks in advance!

Boost

Answer 1

DTS Engineer OP

Apple

Jul ’15

Calling

-close

on both the input and output streams should be sufficient to close the streams. I just tested this with a small test app here in my office and it works as expected. Some things to watch out for in your code:

make sure that
```
-disconnect
```
is actually called — It's easy to confirm this in the debugger.
make sure that
```
-disconnect
```
is called on the correct thread — In general it's best to confine your access to a input/output stream pair to one thread. I suspect that you call both
```
-connect
```
and
```
-disconnect
```
from the main thread, so that's not a problem here.
make sure that
```
inputStream
```
is not nil at the time you call
```
-close
```
— Because you're using the "?" operator, if
```
inputStream
```
was nil your entire -disconnect method would be a no-op.

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