我是网络编程的新手，也是第一次使用 GCDAsyncSocket。我正在尝试实现一个 iOS 应用程序，其中 1 台设备充当主机，其他设备(浏览器)连接到它。我正在使用 NSNetService/NSNetServiceBrowser 来发布/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:
覆盖函数 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，客户端连接到主机并点击以下方法:
func socket(sock: GCDAsyncSocket!, didConnectToHost host: String!, port: UInt16) {
但随后它会立即断开连接，ErrorCode =7 "Socket closed by remote peer"
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})
主机套接字委托(delegate)方法永远不会被命中。
我真的被困在这里了。任何关于我在这里做错了什么的帮助都会很棒。
谢谢 维克
最佳答案
我也有同样的错误!经过大量搜索和摸索，我偶然发现了一个解决方案，该解决方案与 GCDAsyncSocket 的弱声明有关，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
关于sockets - 浏览器上的 GCDAsyncSocket 连接并立即断开连接，出现 "Socket closed by remote peer"错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26920250/