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Node.js fs.Dirent.isCharacterDevice()用法及代码示例


fs.Dirent.isCharacterDevice()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Dirent是否描述了字符设备。

用法:

const dirent.isCharacterDevice()

参数:此方法不接受任何参数。

返回值:如果特定字符描述字符设备,则此方法返回true,否则返回false。

以下程序说明了Node.js中fs.dirent.isCharacterDevice()方法的使用:



范例1:
文件名:index.js

// Node program to demonstrate the  
// dirent.isCharacterDevice() method 
const fs = require('fs'); 
  
// Intiating asyn 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 using 
    // readSync() mehtod 
    for (var i = 0; i <= 3; i++) { 
  
        // Checking if the particular dirent 
        // is Character device or not by using 
        // isCharacterDevice() method 
        const value = (dir.readSync()) 
                .isCharacterDevice(); 
  
        // 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 program to demonstrate the  
// dirent.isCharacterDevice() method 
const fs = require('fs'); 
  
// Intiating asyn function 
async function stop(path) { 
  
    // Creating and initiating directory's 
    // underlying resource handle 
    const dir = await fs.promises 
        .opendir(new URL('file:///F:/')); 
  
    // Synchronously reading the directory's 
    // underlying resource handle using 
    // readSync() mehtod 
    for (var i = 0; i <= 3; i++) { 
  
        // Checking if the particular dirent 
        // is Character device or not by  
        // using isCharacterDevice() method 
        const value = (dir.readSync()) 
                    .isCharacterDevice(); 
  
        // 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:'adonis_auth_api', [Symbol(type)]:2 }
false
Dirent { name:'Android Template', [Symbol(type)]:2 }
false
Dirent { name:'Calander', [Symbol(type)]:2 }
false
Dirent { name:'first-app', [Symbol(type)]:2 }
false

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




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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.isCharacterDevice() 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。