11慕课网《进击Node.js基础（一）》Buffer和Stream

Buffer

(logo.png)

以下代码读取logo.png为buffer类型
然后将buffer转化为string
可以将字符串配置： data:image/png;Base64,Buffer.toString()

var fs = require('fs')

fs.readFile('logo.png',function(err,origin_buffer){
    console.log('origin_buffer是否Buffer格式：'+Buffer.isBuffer(origin_buffer))
    //console.log('读取到origin_buffer:' + origin_buffer)
    //创建文件
    fs.writeFile('log_buffer.png',origin_buffer,function(err){
        if(err) console.log(err)
    })

    //var base84Image = new Buffer(origin_buffer).toString('base64')
    //转为字符串
    var base64Image = origin_buffer.toString('base64')

    console.log('字符串base64Image:' + base64Image)

    var decodedImage = new Buffer(base64Image, 'base64')

    //console.log('编码decodedImage:'+decodedImage)
    //console.log('比较origin_buffer和decodedImage：' + Buffer.compare(origin_buffer,decodedImage))

    fs.writeFile('logo_decoded.png',decodedImage,function(err){
        if(err) console.log(err)
    })

})