Node.js socket.setRecvBufferSize() 方法

socket.setRecvBufferSize() 方法是 dgram 模块中 Socket 类的内置应用程序编程接口，用于设置套接字接收缓冲区的大小（以字节为单位）。

句法：

const socket.setSendBufferSize( size )

参数：该方法将整数值大小作为大小分配的参数。

返回值：此方法不返回任何值。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// server.getRecvBufferSize() method
 
// Importing dgram module
var dgram = require('dgram');
 
// Creating and initializing 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();
})
    // Binding server with port
    .bind(1234, () => {
 
        // Setting the receiver buffer size
        // by using setRecvBufferSize() method
        server.setRecvBufferSize(12345);
 
        // Getting the receiver buffer size
        // by using getRecvBufferSize() method
        const size = server.getRecvBufferSize();
 
        // 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
// server.setRecvBufferSize() method
 
// Importing dgram module
var dgram = require('dgram');
 
// Creating and initializing 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', () => {
 
    // 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 receive buffer size
    // by using setRecvBufferSize() method
    server.setRecvBufferSize(1234567);
 
    // Getting the receive buffer size
    // by using getRecvBufferSize() method
    const size = server.getRecvBufferSize();
 
    // 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
UDP String: Hello

使用以下命令运行 index.js 文件：

node index.js

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