Node.js fs.Dir.readSync() 方法
fs.Dir.readSync()方法是文件系统模块中fs.Dir类的内置应用程序编程接口,用于读取目录的每个下一个目录。
句法:
const dir.readSync()
参数:此方法不接受任何参数。
返回值:该方法返回目录的dirent。
下面的程序说明了 Node.js 中fs.Dir.readSync()方法的使用:
示例 1:
文件名:index.js
javascript
// Node.js program to demonstrate the
// dir.readSync() method
const fs = require('fs');
// Initiating async function
async function stop(path) {
// Creating and initiating directory's
// underlying resource handle
const dir = await fs.promises.opendir(path);
// Synchronously reading the directory's
// underlying resource handle
const dirent = dir.readSync();
// Display the result
console.log(dirent.name);
}
// Catching error
stop('./').catch(console.error);
javascript
// Node.js program to demonstrate the
// dir.readSync() method
const fs = require('fs');
// Initiating async 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 directory's
// underlying resource handle
// using readSync() method
for(var i = 0 ; i <= 3 ; i ++ ) {
var dirent = dir.readSync();
// Display the result
console.log(dirent.name);
}
} 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:
abcd.cer
示例 2:
文件名:index.js
javascript
// Node.js program to demonstrate the
// dir.readSync() method
const fs = require('fs');
// Initiating async 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 directory's
// underlying resource handle
// using readSync() method
for(var i = 0 ; i <= 3 ; i ++ ) {
var dirent = dir.readSync();
// Display the result
console.log(dirent.name);
}
} 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:
abcd.cer
cert.cer
certfile.cer
certificate1.cer
dir is closed successfully
参考: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dir_readsync