swift - 在 swift NSNetService 类中如何使用 getInoutStream 发送数据

Question

目前我正在开发一个程序，在该程序中我使用 NSNetService 类连接两个 IOS 设备。我能够连接两个设备，但我不知道如何使用 getInoutStream 函数发送数据。有没有小伙伴可以帮帮我。

Answer 1

为什么不使用multipeer？对于您正在尝试做的事情，这是一个更简单的解决方案。NSNetService 也有一些已知的错误。但是，您可以通过在 NSNetService 上设置 Bonjour 连接在两者之间发送数据。getInputStream 方法需要 UnsafeMutablePointer 类型的参数：

    public func getInputStream(inputStream: UnsafeMutablePointer<NSInputStream?>, outputStream: UnsafeMutablePointer<NSOutputStream?>) -> Bool

var inputStream : NSInputStream?
var outputStream : NSOutputStream?

let success = service.getInputStream(&inputStream, outputStream: &outputStream)

然后只需使用内存流写入数据，它将被传递到侦听器端口。

这是完成的代码：

此函数在 127.0.0.1 上启动连接

func initNetworkCommunication(){
    var host : CFString = "127.0.0.1"
    var port : UInt32 = 7001
    var readstream : Unmanaged<CFReadStream>?
    var writestream : Unmanaged<CFWriteStream>?
    CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, host, port, &readstream, &writestream)

    inputstream = readstream!.takeRetainedValue()
    outputstream = writestream!.takeRetainedValue()

    inputstream.delegate = self
    outputstream.delegate = self


    inputstream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
    outputstream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)

    inputstream.open()

这是针对流 IO 的：

func stream(aStream: NSStream, handleEvent eventCode: NSStreamEvent) { //This is the stream IO function. It allows RW of the stream
        switch (eventCode){
    case NSStreamEvent.ErrorOccurred:
        NSLog("ErrorOccurred")
        break
    case NSStreamEvent.EndEncountered:
        NSLog("EndEncountered")
        break
    case NSStreamEvent.None:
        NSLog("None")
        break
    case NSStreamEvent.HasBytesAvailable:
        NSLog("HasBytesAvaible")
        var buffer = [UInt8](count: 4096, repeatedValue: 0)
        if ( aStream == inputstream){

            while (inputstream.hasBytesAvailable){
                var len = inputstream.read(&buffer, maxLength: buffer.count) 
                if(len > 0){
                    var output = NSString(bytes: &buffer, length: buffer.count, encoding: NSUTF8StringEncoding) 
                    if (output != ""){
                        NSLog("server said: %@", output!)
                    }
                }
            } 
        }
        break
    case NSStreamEvent.allZeros:
        NSLog("allZeros")
        break
    case NSStreamEvent.OpenCompleted:
        NSLog("OpenCompleted")
        break
    case NSStreamEvent.HasSpaceAvailable:
        NSLog("HasSpaceAvailable")
        break
   default:
        // default code here
        break
  }