Node.js dgram.createSocket()方法
原文:https://www . geesforgeks . org/node-js-dgram-create socket-method/
方法是 dgram 模块中内置的应用程序编程接口，用于创建 dgram.socket 对象。
语法:
const dgram.createSocket(options[, callback])
参数:该方法取以下参数:
- Option: One of the following options will be used-
- Type: series socket.
- Boolean value when reusing address: .
- ipv6Only: Setting IPv6 only to true will disable dual stack support.
- recvbbuffersize: 沙吾提 S7-1200 可编程控制器哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟哟。
- 【T0 发送缓冲区大小】so _ snd 缓冲区.
- Search: User-defined search function.
- Callback: Callback function for further operation.
返回值:这个方法返回 dgram.socket 的对象。
示例 1: 文件名:index.js
java 描述语言
// Node.js program to demonstrate the
// dgram.createSocket() method
// importing dgram module
var dgram = require('dgram');
// Creating and initializing client
// and server socket by using
// createSocket() method
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();
})
// Binding server with port
.bind(1234, () => {
// Setting the Send buffer size
// by using setSendBufferSize() method
server.setSendBufferSize(12345);
// Getting the receive buffer size
// by using getSendBufferSize() method
const size = server.getSendBufferSize();
// Display the result
console.log(size);
});
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");
输出:
12345
UDP String: Hello
示例 2: 文件名:index . js
Javascript
// Node.js program to demonstrate the
// dgram.createSocket() method
// Importing dgram module
var dgram = require('dgram');
// Creating and initializing client
// and server socket by using
// createSocket() method
var client = dgram.createSocket("udp4", () => {
console.log("client is created");
});
var server = dgram.createSocket("udp4", () => {
console.log("server is created");
});
// 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', () => {
// Getting address information
// for the server
const address = server.address();
// Display the result
console.log(`server listening
${address.address}:${address.port}`);
});
// Binding server with port address
// by using bind() method
server.bind(1234, () => {
// Setting the Send buffer size
// by using setSendBufferSize() method
server.setSendBufferSize(1234567);
// Getting the Send buffer size
// by using getSendBufferSize() method
const size = server.getSendBufferSize();
// Display the result
console.log(size);
});
// Client sending message to server
client.send("Hello", 0, 7, 1234, "localhost");
输出:
server listening 0.0.0.0:1234
1234567
server is created
UDP String: Hello
使用以下命令运行 index.js 文件:
node index.js
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