浏览器上的 GCDAsyncSocket 立即连接和断开连接，并出现“远程对等方关闭套接字”错误

Posted 2023-02-24

【中文标题】浏览器上的 GCDAsyncSocket 立即连接和断开连接，并出现“远程对等方关闭套接字”错误

【英文标题】：GCDAsyncSocket on browser connects and disconnects immediately with "Socket closed by remote peer" error

【发布时间】：2014-11-13 23:14:51

【问题描述】：

我对网络编程和第一次使用 GCDAsyncSocket 非常陌生。我正在尝试实现一个 ios 应用程序，其中 1 个设备充当主机，其他设备（浏览器）连接到它。我正在使用 NSNetService/NSNetServiceBrowser 发布/浏览部分。

现在，我的客户端/浏览器正确解析主机地址并尝试使用以下代码连接到它：

func netServiceDidResolveAddress(sender: NSNetService) 
   // Connect with Service
   if (self.connectWithService(sender, hostname: sender.hostName!)) 
       println("Connecting with service: domainName= \(sender.domain), type= \(sender.type), name= \(sender.name), onPort= \(sender.port) and hostname: \(sender.hostName!)");
    else 
       println("Unable to connect with service: domainName= \(sender.domain), type= \(sender.type), name= \(sender.name), onPort= \(sender.port)");
   


private func connectWithService(service: NSNetService, hostname: String) ->Bool 

    var isConnecting:Bool = false;



    if (self.browserSocket == nil || !(self.browserSocket?.isConnected)!) 

        // Initialize Socket

        self.browserSocket = GCDAsyncSocket(delegate: self, delegateQueue: dispatch_get_main_queue());



        // Connect

        while (!isConnecting)

            var error: NSError?;

            println("Connecting port : \(service.port) and hostname: \(hostname)");

            if (self.browserSocket.connectToHost(hostname, onPort: UInt16(service.port), error: &error)) 

                isConnecting = true;

             else if (error != nil) 

                println("Unable to connect to address. Error \(error) with user info \(error?.userInfo)");

            

        

     else 

        println("Connecting is: \(self.browserSocket.isConnected)");

        isConnecting = self.browserSocket.isConnected;

    

    return isConnecting;



// GCDAsyncSocketDelegate methods

func socket(sock: GCDAsyncSocket!, didConnectToHost host: String!, port: UInt16) 
   println("Socket: \(sock) Did connect to host: \(host) on port:\(port)");

   // Start Reading
   sock.readDataToLength(UInt(sizeof(UInt64)), withTimeout: -1.0, tag: 0);


func socketDidDisconnect(sock: GCDAsyncSocket!, withError err: NSError!) 
   println("Socket \(sock) did disconnect with error \(err?)");

 

以下是发布者代码：

覆盖 func viewDidLoad()

    super.viewDidLoad()

    let barButton = UIBarButtonItem(title: "Stop Publishing", style: .Done, target: self, action: "stopPublishing");

    self.navigationItem.rightBarButtonItem = barButton;



    // Publish the service

    self.publishService();



// MARK: Button callbacks

private func publishService() 

    // Initialize GCDAsyncSocket

    self.socket = GCDAsyncSocket(delegate: self, delegateQueue: dispatch_get_main_queue());



    // Start listening for incoming connections

    var error: NSError?;

    if (self.socket.acceptOnPort(0, error: &error)) 

        // Initialize Service

        self.service = NSNetService(domain: "local.", type: "_mpstest._tcp", name: UIDevice.currentDevice().name, port:0);



        // Configure Service

        self.service.delegate = self;

        self.service.includesPeerToPeer = true;

        self.service.publishWithOptions(.ListenForConnections);

     else 

        println("Unable to create socket. Error \(error?.description) with user info \(error?.userInfo)");

    

现在，客户端与主机连接并点击以下方法：

func socket(sock: GCDAsyncSocket!, didConnectToHost host: String!, port: UInt16) 

但随后它立即断开与 ErrorCode =7 "Socket closed by remote peer" 的以下方法的连接

func socketDidDisconnect(sock: GCDAsyncSocket!, withError err: NSError!) 

以下是来自浏览器设备的控制台日志：

Service found is : <NSNetService 0x15e2f710> local. _mpstest._tcp. iPad 30
Connecting port : 50797 and hostname: iPad-30.local.
Connecting with service: domainName= local., type= _mpstest._tcp., name= iPad 30, onPort= 50797 and hostname: iPad-30.local.
Socket <GCDAsyncSocket: 0x15d80020> did disconnect with error Optional(Error Domain=kCFStreamErrorDomainNetDB Code=8 "nodename nor servname provided, or not known" UserInfo=0x15e3c7a0 NSLocalizedDescription=nodename nor servname provided, or not known)
Connecting port : 50797 and hostname: iPad-30.local.
Connecting with service: domainName= local., type= _mpstest._tcp., name= iPad 30, onPort= 50797 and hostname: iPad-30.local.
Socket: <GCDAsyncSocket: 0x15e59c20> Did connect to host: 169.254.78.98 on port:50797
Socket <GCDAsyncSocket: 0x15e59c20> did disconnect with error Optional(Error Domain=GCDAsyncSocketErrorDomain Code=7 "Socket closed by remote peer" UserInfo=0x15e5b070 NSLocalizedDescription=Socket closed by remote peer)

永远不会命中主机套接字委托方法。

我真的被困在这里了。关于我在这里做错了什么的任何帮助都会很棒。

谢谢 维克

【问题讨论】：

在 Objective C 中也有同样的问题：***.com/q/27419679/2225439

我遇到了完全相同的问题。由于这已经有几个月了，你有没有设法解决这个问题？如果是这样，我会喜欢一个提示:)

【参考方案1】：

我也有同样的错误！经过大量搜索并拔出头发后，我偶然发现了一个与 GCDAsyncSocket 的弱声明有关的解决方案，Swift 中的 ARC 将 GCDAsyncSocket.m 中的声明“__weak”理解为尽快释放套接字的借口。

在您的项目中搜索关键字“__weak”并删除所有引用。 在以下位置找到此解决方案：Delegate not getting set

【讨论】：

收到第一个请求的响应后，Socket 断开连接。