swift - NetService 无法发布

Question

我正在尝试在 Swift 中本地发布 bonjour 服务进行简单测试。我通过一个简单的单 View 应用程序来执行此操作，该应用程序仅创建一个 netService 对象并尝试发布它。当我运行应用程序时，它无法发布，并且委托(delegate)调用 didNotPublish 函数，从而生成错误

code -72004 ("An required argument was not provided when initializing the NSNetService instance").

我无法弄清楚缺少的参数可能是什么，因为我已经指定了每个域、类型、名称和端口。

class ViewController: NSViewController, NetServiceDelegate {

    var netService : NetService?

    override func viewDidLoad() {
        super.viewDidLoad()

        //initialize the NetService object
        self.netService = NetService(domain: "local.", type: "testService._tcp.", name: "netServiceTest", port: Int32(80))

        //assing NetService delegate to ViewController object
        self.netService!.delegate = self

        //publish it
        self.netService!.publish()
    }

    override var representedObject: Any? {
        didSet {
            // Update the view, if already loaded.
        }
    }

    //netservice delegate functions
    func netService(_ sender: NetService, didNotPublish errorDict: [String : NSNumber]) {
        print("uh oh, could not publish netService. domain:\(netService!.domain) type:\(netService!.type) name:\(netService!.name) port:\(netService!.port)")
        print("error code:\(errorDict)")
    }

    func netServiceDidPublish(_ sender: NetService) {
        print("netService published.")
    }

    func netServiceDidStop(_ sender: NetService) {
        print("netService stopped.")
    }

    func netServiceWillPublish(_ sender: NetService) {
        print("Service will publish, apparently")
    }
}

Answer 1

您的类型设置不正确。您需要在类型前添加下划线前缀。
所以它应该看起来像这样:“_testService._tcp。”

<小时/>

来自NetService Documentation :

type
The network service type. type must contain both the service type and transport layer information. To ensure that the mDNS responder searches for services, as opposed to hosts, prefix both the service name and transport layer name with an underscore character (“_”). For example, to search for an HTTP service on TCP, you would use the type string "_http._tcp.". Note that the period character at the end of the string, which indicates that the domain name is an absolute name, is required.