Swift udp实现根据端口号监听广播数据(利用GCDAsyncUdpSocket实现)

有个小需求,app需要监听pc广播的数据:

代码实现思路:

使用三方库:CocoaAsyncSocket

1、开启udp监听:

udpSocket.beginReceiving()

2、读取udp的数据,包括对方设备的ip

func udpSocket(_ sock: GCDAsyncUdpSocket, didReceive data: Data, fromAddress address: Data, withFilterContext filterContext: Any?)

实现参考代码:

1、申明变量

var udpSocket : GCDAsyncUdpSocket!

2、根据port端口开启监听

udpSocket = GCDAsyncUdpSocket(delegate: self, delegateQueue: DispatchQueue.main)
do{
try udpSocket.bind(toPort: )
try udpSocket.beginReceiving() }catch{
print("bind error")
};

其中60001是定义好的端口号

3、实现代理

func udpSocket(_ sock: GCDAsyncUdpSocket, didReceive data: Data, fromAddress address: Data, withFilterContext filterContext: Any?) {
//Optional("{\"Port\":61312,\"LPort\":61313,\"HostName\":\"Lucifer-PC\"}")" var hostname = [CChar].init(repeating: , count: Int(NI_MAXHOST))
do{
try address.withUnsafeBytes({ (pointer:UnsafePointer<sockaddr>) -> Void in
guard getnameinfo(pointer, socklen_t(data.count), &hostname, socklen_t(hostname.count), nil, , NI_NUMERICHOST) == else{
throw NSError(domain: "domain", code: , userInfo: ["error":"unable to get ip address"])
}
})
}catch(let error){
print(error.localizedDescription)
}
var newAddress = String.init(cString: hostname)
let addArry = newAddress.components(separatedBy: ":")
if addArry.count > {
newAddress = addArry[addArry.count-]
}
print("IP:\(newAddress)") let dict = data.toDictionary() //data转字典
if let _port = dict["Port"] as? Int,let _lport = dict["LPort"] as? Int, let _name = dict["HostName"] as? String{
//根据广播的信息,构造模型
let model = SocketConnectModel(_ip: newAddress, _port: _port, _lport: _lport, _hostName: _name, _isconnect: false)
addWifiArry(model: model) } }

这里解释一下:

一般情况下,我们可能只需要得到广播的内容就足够,也就是上面的 didReceive data: Data,我们直接将data转换我们需要的格式即可。

我这里比较特殊,还需要知道对方设备的ip,所以需要对 fromAddress address: Data,处理。

4、结束监听

udpSocket?.close()

退出页面,或需要结束时,记得调用close方法。

enjoy~

 
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