fs.Dirent.isFIFO()方法是文件系统模块中类fs.Dirent的内置应用程序编程接口,用于检查特定的dirent是否描述了先进先出管道。
用法:
const dirent.isFIFO()
参数:此方法不接受任何参数。
返回值:如果特定Dirent描述先进先出管道,则此方法返回true,否则返回false。
以下程序说明了Node.js中fs.dirent.isFIFO()方法的使用:
范例1:
文件名:index.js
// Node.js program to demonstrate the
// dirent.isFIFO() method
const fs = require('fs');
// Initiating asyn function
async function stop(path) {
// Creating and initiating FIFO's
// underlying resource handle
const dir = await fs.promises.opendir(path);
// Synchronously reading the FIFO's
// underlying resource handle
// using readSync() mehtod
for(var i = 0; i <= 3; i ++ ) {
// Checking if the particular dirent is
// FIFO or not by using isFIFO() method
const value = (dir.readSync()).isFIFO();
// Display the result
console.log(dir.readSync());
console.log(value);
}
}
// Catching error
stop('./').catch(console.error);
使用以下命令运行index.js文件:
node index.js
输出:
Dirent { name:'cert.cer', [Symbol(type)]:1 } false Dirent { name:'certificate1.cer', [Symbol(type)]:1 } false Dirent { name:'filename.txt', [Symbol(type)]:1 } false Dirent { name:'GFG.java', [Symbol(type)]:1 } false
范例2:
文件名:index.js
// Node.js program to demonstrate the
// dirent.isFIFO() method
const fs = require('fs');
// Initiating asyn function
async function stop(path) {
let dir = null;
try {
// Creating and initiating directory's
// underlying resource handle
dir = await fs.promises.opendir(
new URL('file:///F:/java/'));
// Synchronously reading the FIFO's
// underlying resource handle
// using readSync() method
for(var i = 0; i <= 3; i ++ ) {
// Checking if the particular dirent is
// FIFO or not by using isFIFO() method
const value = (dir.readSync()).isFIFO();
// Display the result
console.log(dir.readSync());
console.log(value);
}
} finally {
if (dir) {
// Display the result
console.log("dir is closed successfully");
// Synchronously closeSyncing the directory's
// underlying resource handle
const promise = dir.closeSync();
}
}
}
// Catching error
stop('./').catch(console.error);
使用以下命令运行index.js文件:
node index.js
输出:
Dirent { name:'cert.cer', [Symbol(type)]:1 } false Dirent { name:'certificate1.cer', [Symbol(type)]:1 } false Dirent { name:'features', [Symbol(type)]:2 } false Dirent { name:'GFG.class', [Symbol(type)]:1 } false dir is closed successfully
参考: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dirent_isfifo
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注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js fs.Dirent.isFIFO() Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。