Node.js socket.dropMembership()用法及代碼示例

socket.dropMembership()方法是dgram模塊中Socket類的內置應用程序編程接口，用於使內核在特定的多播地址處保留多播組。

用法:

const socket.dropMembership(multicastAddress[, multicastInterface])

參數：該方法將表示組播地址和組播接口的字符串作為參數。

返回值：此方法不返回任何值。

範例1： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// socket.dropMembership() method 
  
// Importing dgram module 
var dgram = require('dgram'); 
  
// Creating and intializing client  
// and server socket 
var client = dgram.createSocket("udp4"); 
var server = dgram.createSocket("udp4"); 
  
// Catching the message event 
server.on("message", function (msg) { 
  
    // Displaying the client message 
    process.stdout.write("UDP String:" + msg + "\n"); 
  
    // Exiting process 
    process.exit(); 
}) 
.bind(1234, () => { 
  
    // Joining a multicast group at 
    // multicast address 
    server.addMembership('224.0.0.114'); 
  
    // leaving a multicast group at 
    // multicast address 
    server.dropMembership('224.0.0.114'); 
}); 
  
// Client sending message to server 
client.send("Hello", 0, 7, 1234, "localhost");

輸出：

UDP String:Hello

範例2： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// socket.dropMembership() method 
  
// Importing dgram module 
var dgram = require('dgram'); 
  
// Creating and intializing client 
// and server socket 
var client = dgram.createSocket("udp4"); 
var server = dgram.createSocket("udp4"); 
  
// Catching the message event 
server.on("message", function (msg) { 
  
    // Displaying the client message 
    process.stdout.write("UDP String:" + msg + "\n"); 
  
    // Exiting process 
    process.exit(); 
}); 
  
// Catching the listening event 
server.on('listening', () => { 
    const address = server.address(); 
    console.log(`server listening  
        ${address.address}:${address.port}`); 
}); 
  
// Binding server with port address 
server.bind(1234, () => { 
  
    // Adding a multicast address for 
    // others to join 
    server.addMembership('224.0.0.114'); 
  
    // leaving a multicast group at multicast 
    // address by using dropMembership() method 
    server.dropMembership('224.0.0.114'); 
}); 
  
// Client sending message to server 
client.send("Hello", 0, 7, 1234, "localhost");

輸出：

server listening 0.0.0.0:1234
UDP String:Hello

使用以下命令運行index.js文件：

node index.js

參考：https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_dropmembership_multicastaddress_multicastinterface

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js socket.dropMembership() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。