Question

我发现以下代码可以处理使用Apple Network Framework的Websocket，并且运行良好：

let connection = NWConnection(host: "**.**.**.**", port: ****, using: .tcp)

override func viewDidLoad() {
    super.viewDidLoad()

    connection.stateUpdateHandler = { state in
        print("State:", state)
        switch state {
        case .ready:
            self.connectionReady(self.connection)
        case .cancelled:
            print("cancelled")
        default:
            break
        }
    }
    connection.start(queue: .main)
}

func connectionReady(_ connection: NWConnection) {

    let raw = """
    GET / HTTP/1.1
    Upgrade: websocket
    Connection: Upgrade
    Sec-WebSocket-Version: 13
    Sec-WebSocket-Key: ************************
    Host: **.**.**.**:****
    """

    let rawData = raw.appending("\n\n\n").replacingOccurrences(of: "\n", with: "\r\n").data(using: .utf8)

    connection.send(content: rawData!, completion: .idempotent)

    connection.receiveMessage(completion: {data, context, bool, error in
        if let data = data {
            print("Received:", String(data: data, encoding: .ascii) ?? "no string")
        }
    })
}

控制台输出正是我想要的：

State: preparing
State: ready
Received: HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: ****************************

现在我想对Starscream进行同样的操作，但是我什么也没收到，我也不知道为什么。希望有人能帮忙。这是我的代码：

let socket = WebSocket(url: URL(string: "ws://**.**.**.**:****/")!)
var rawData: Data!

override func viewDidLoad() {
    super.viewDidLoad()

    let raw = """
    GET / HTTP/1.1
    Upgrade: websocket
    Connection: Upgrade
    Sec-WebSocket-Version: 13
    Sec-WebSocket-Key: ************************
    Host: **.**.**.**:****
    """
    rawData = raw.appending("\n\n\n").replacingOccurrences(of: "\n", with: "\r\n").data(using: .utf8)

    socket.connect()
}

func websocketDidConnect(socket: WebSocketClient) {
    print("connect")
    socket.write(data: rawData)
}

func websocketDidDisconnect(socket: WebSocketClient, error: Error?) {
    print("disconnect")
    print(error?.localizedDescription)
}

func websocketDidReceiveMessage(socket: WebSocketClient, text: String) {
    print("receiveMessage")
    print(text)
}

func websocketDidReceiveData(socket: WebSocketClient, data: Data) {
    print("receiveData")
    print(data)
}

现在我什么也没收到。它会连接，然后立即断开连接，我收到错误消息“操作无法完成”。控制台输出：

connect
disconnect
Optional("The operation couldn’t be completed. (Starscream.WSError error 1.)")

Answer 1

好的，我找到了原因。我必须使用AdvancedDelegate来获得相同的输出。但是也许有人可以告诉我为什么它会立即断开并显示错误消息“操作无法完成”

无法通过Starscream WebSocket接收数据

1 个答案: