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swift - NSInputStream/NSOutputStream 未打开

转载 作者:搜寻专家 更新时间:2023-10-31 23:02:19 29 4
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我正在尝试使用 NSInputStreamNSOutputStream 建立到 TCP 服务器的连接。永远不会收到 HasBytesAvailableHasSpaceAvailable 事件。所以我不知道套接字是否真的设置好了?

在这种特殊情况下,我可以访问服务器并且实际上可以看到它建立了连接,所以我尝试在接收到 HasSpaceAvailable 事件之前写入数据并且成功了!

但由于 HasBytesAvailable 事件从未触发,我不知道何时从流中读取。

虽然我已经阅读了大部分关于 SO 的类似帖子并尝试了其中的很多,但没有运气。

如果有人能看到我遗漏的明显内容,那将对我有很大帮助! :)

下面是我类(class)的相关代码:

class TCPConnection : NSObject, NSStreamDelegate {


private var host: String
private var port: Int
private var inputStream: NSInputStream?
private var outputStream: NSOutputStream?
private var readyToWrite = true

init(host: String, port: Int) {
self.host = host
self.port = port

super.init()

NSStream.getStreamsToHostWithName(self.host, port: self.port, inputStream: &inputStream, outputStream: &outputStream)

inputStream!.delegate = self
outputStream!.delegate = self

inputStream!.scheduleInRunLoop(.currentRunLoop(), forMode: NSDefaultRunLoopMode)
outputStream!.scheduleInRunLoop(.currentRunLoop(), forMode: NSDefaultRunLoopMode)

inputStream!.open()
outputStream!.open()
}

func stream(aStream: NSStream, handleEvent eventCode: NSStreamEvent) {
if (aStream == inputStream) {
print("event received: inputStream")
switch eventCode {
case NSStreamEvent.ErrorOccurred:
print("ErrorOccurred: \(aStream.streamError?.description)")
break

case NSStreamEvent.EndEncountered:
print("EndEncountered: \(aStream.streamError?.description)")
break

case NSStreamEvent.HasBytesAvailable:
print("HasBytesAvailable")
break

case NSStreamEvent.None:
print("None")
break

case NSStreamEvent.OpenCompleted:
print("opened!")
break

default:
print("default")
}
} else if aStream == outputStream {
print("event received: outputStream")
switch eventCode {
case NSStreamEvent.ErrorOccurred:
print("ErrorOccurred: \(aStream.streamError?.description)")
break

case NSStreamEvent.EndEncountered:
print("EndEncountered: \(aStream.streamError?.description)")
break

case NSStreamEvent.HasSpaceAvailable:
print("HasSpaceAvailable")
break

case NSStreamEvent.None:
print("None")
break

case NSStreamEvent.OpenCompleted:
print("opened!")
break

default:
print("default")
}
} else {
print("another stream?")
}

}

}

最佳答案

只需在 getStreamsToHostWithName 方法调用中添加 autoreleasepool,因为 NSStream 在 block 执行完成时释放

autoreleasepool {
NSStream.getStreamsToHostWithName(self.host, port: self.port, inputStream: &inputStream, outputStream: &outputStream)
}

我已经在 xcode7 beta 4 和 SocketTest 工具(http://sourceforge.net/projects/sockettest/?source=typ_redirect)中测试了上面的代码 enter image description here

或者,您也可以使用 CFStreamCreatePairWithSocketToHost API

class TCPConnection: NSObject, NSStreamDelegate {
var host:String?
var port:UInt32?
var inputStream: NSInputStream?
var outputStream: NSOutputStream?
var status = false;
var output = "message"
var bufferSize = 1024;
init(host: String, port:UInt32){
self.host = host
self.port = port
self.status = false
output = ""
super.init()
}

func stream(aStream: NSStream, handleEvent aStreamEvent: NSStreamEvent) {
switch aStreamEvent {

case NSStreamEvent.OpenCompleted:
print("OpenCompleted")
break

case NSStreamEvent.HasBytesAvailable:
print("HasBytesAvailable")
break

case NSStreamEvent.HasSpaceAvailable:
print("HasSpaceAvailable")
break

case NSStreamEvent.EndEncountered:
print("EndEncountered")

// aStream.close()
aStream.removeFromRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
break

case NSStreamEvent.None:

break

case NSStreamEvent.ErrorOccurred:

break

default:
print("# something weird happend")
break
}
}

func connect() {
print("# connecting to \(host):\(port)")
var cfReadStream : Unmanaged<CFReadStream>?
var cfWriteStream : Unmanaged<CFWriteStream>?

CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, host, port!, &cfReadStream, &cfWriteStream)
inputStream = cfReadStream!.takeRetainedValue()
outputStream = cfWriteStream!.takeRetainedValue()

inputStream!.delegate = self
outputStream!.delegate = self

inputStream!.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
outputStream!.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)

inputStream!.open()
outputStream!.open()
}


func read(){
var buffer = [UInt8](count: bufferSize, repeatedValue: 0)
output = ""
while (self.inputStream!.hasBytesAvailable){
var bytesRead: Int = inputStream!.read(&buffer, maxLength: buffer.count)
if bytesRead >= 0 {
output += NSString(bytes: UnsafePointer(buffer), length: bytesRead, encoding: NSASCIIStringEncoding)! as String
} else {
print("# error")
}
print("> \(output)")
}
}

func send(message:String){
let data:NSData = message.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
let bytesWritten = self.outputStream!.write(UnsafePointer(data.bytes), maxLength: data.length)
print("< send to \(host)")

}
}

关于swift - NSInputStream/NSOutputStream 未打开,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32191344/

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