DatagramSocket类的bind（）和connect（）的区别？ [英] DatagramSocket bind() and connect() difference?

问题描述

我读<一href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/DatagramSocket.html"相对=nofollow>文档，但目前尚不清楚什么之间的差异绑定（）和连接（）的方法。

I read the documentation, but it is not clear whats the difference between bind() and connect() methods.

推荐答案

绑定（）使插座为听作为对传入的请求特定的接口/端口。换言之，它用于通过服务器向进入的请求作出响应。只有一个插座可以绑定一个端口。

bind() causes the socket to listen for incoming requests on a particular interface/port. In other words, it's used by servers to respond to incoming requests. Only one socket can bind a port.

连接（）使插座做出的连接以一个地址/端口由不同的插座服务。换句话说，它是使用客户端连接，以一台服务器。多个客户端可以连接到端口。 注意：连接（）不需要使用UDP（数据报）套接字，只有TCP / IP使用。 UDP是一个广播协议，以及连接（）甚至不要求一个插座侦听到另一端。

connect() causes the socket to make a connection to an address/port serviced by a different socket. In other words, it's used by clients to connect to a server. Multiple clients can connect to a port. NOTE: connect() is not required for use with UDP (datagram) sockets, only TCP/IP. UDP is a broadcast protocol, and connect() does not even require that a socket is listening to the other end.

像这样的东西（改编自文档和未经测试）应该发送和接收消息你好，萝卜！本身在端口12345：

Something like this (adapted from the docs and untested) should send and receive the message "Hello, turnip!" to itself on port 12345:

package
{
    import flash.events.DatagramSocketEvent;
    import flash.net.DatagramSocket;

    public class TestClass
    {
        private var serverSocket:DatagramSocket = new DatagramSocket();
        private var clientSocket:DatagramSocket = new DatagramSocket();

        public function TestClass():void
        {
            this.serverSocket.bind(12345, "127.0.0.1");
            this.serverSocket.addEventListener(DatagramSocketDataEvent.DATA, dataReceived);
            this.serverSocket.receive();

            send("Hello, turnip!");
        }

        public function sendData(message:String):void
        {
            var data:ByteArray = new ByteArray();
            data.writeUTFBytes(message);

            try
            {
                clientSocket.send(data, 0, 0, "127.0.0.1", 12345);
                trace("sending:  " + message);
            }
            catch (error:Error)
            {
                trace(error.message);
            }
        }

        private function dataReceived(e:DatagramSocketDataEvent):void
        {
            var data:String = e.data.readUTFBytes(e.data.bytesAvailable);
            trace("received: " + data);
        }
    }
}

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