Node.js 파일 조작 노트

const express = require('express')

const fs = require('fs')


/**
 *       
 */
let fd = fs.openSync('h.txt','w')
console.log(fd)

//    
let str = 'cimo'
fs.writeFileSync(fd,str)

//    
fs.closeSync(fd)

/**
 *       
 */
 fs.open('h.txt','w',(err,fd)=>{
    fs.writeFile(fd,'cimo incimo',(err)=>{
        if(!err){
            console.log('    ')
            fs.close(fd,()=>{
                console.log('      ')
            })
        } else {
            console.log(err)
        }
    })
 })

 console.log(123)

/**
 *      
 */

//     
let ws = fs.createWriteStream('h.txt')

//      
ws.once('open',()=>{
    console.log('    ')
    ws.write('  gaio    giao giao oh
')
    ws.write('  gaio    giao giao oh
')
    ws.write('  gaio    giao giao oh')
    //    
    ws.end()
})

//       
ws.once('close',()=>{
    console.log('    ')
})

/**
 *     
 */

 //  
 fs.readFile('h.txt',(err,data)=>{
    if(!err){
        console.log(data.toString())
    } else {
        console.log('err:',err)
    }
 })

 console.log('    ')

 //            
 fs.readFile('   .png',(err,data)=>{
    if(!err){
        console.log(data)
        fs.writeFile('   .png',data,(err)=>{
            if(!err){
                console.log('        ')
            } else {
                console.log('err',err)
            }
        })
    } else {
        console.log('err:',err)
    }
 })

/**
 *      
 */

 let rs = fs.createReadStream('   .png')
 let ws = fs.createWriteStream('dada  .png')

 //     
 rs.once('open',()=>{
    console.log('     ')
 })

 rs.once('close',()=>{
    console.log('     ')
 })

//     
 ws.once('open',()=>{
    console.log('     ')
 })

 ws.once('close',()=>{
    console.log('     ')
 })

 //           
 //        
 rs.on('data',(data)=>{
     ws.write(data)
 })

/**
 *         - >      ->                
 */
rs.pipe(ws)