Base64 Nodejs 中的 ReadFile

我正在尝试从客户端读取用 Base64编码的图像。 如何与 nodejs 阅读？

我的代码:

// add to buffer base64 image
var encondedImage = new Buffer(image.name, 'base64');


fs.readFile(encondedImage, "base64", function(err, buffer){
if ( err ) {
console.log('In read file')
console.log(err)
} else {
// check err
lwip.open(buffer, 'jpg', function(err, image){
console.log('in open')
if ( err ) console.log(err)


if ( image ) console.log(image)
// check 'err'. use 'image'.
// image.resize(...), etc.
});
}
})

但是，我得到了这个错误:

In read file
[Error: Path must be a string without null bytes.]
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小开

I think that the following example demonstrates what you need: I removed the link because it was broken.

The essence of the article is this code part:

var fs = require('fs');


// function to encode file data to base64 encoded string
function base64_encode(file) {
// read binary data
var bitmap = fs.readFileSync(file);
// convert binary data to base64 encoded string
return new Buffer(bitmap).toString('base64');
}


// function to create file from base64 encoded string
function base64_decode(base64str, file) {
// create buffer object from base64 encoded string, it is important to tell the constructor that the string is base64 encoded
var bitmap = new Buffer(base64str, 'base64');
// write buffer to file
fs.writeFileSync(file, bitmap);
console.log('******** File created from base64 encoded string ********');
}


// convert image to base64 encoded string
var base64str = base64_encode('kitten.jpg');
console.log(base64str);
// convert base64 string back to image
base64_decode(base64str, 'copy.jpg');
小开 
var fs = require('fs');


function base64Encode(file) {
var body = fs.readFileSync(file);
return body.toString('base64');
}




var base64String = base64Encode('test.jpg');
console.log(base64String);
小开
最佳答案

Latest and greatest way to do this:

Node supports file and buffer operations with the base64 encoding:

const fs = require('fs');
const contents = fs.readFileSync('/path/to/file.jpg', {encoding: 'base64'});

Or using the new promises API:

const fs = require('fs').promises;
const contents = await fs.readFile('/path/to/file.jpg', {encoding: 'base64'});
小开

The following code reads a text file. Then converts it to text, then reads it as base64 and puts that into a binary buffer, and saves it back to a true binary.

import { readFileSync, writeFileSync } from 'fs'
import { tmpdir } from 'os'
const contents = readFileSync('./temp.txt')
const buffedInput = Buffer.from(contents.toString(), 'base64')
writeFileSync(`${tmpdir}/temp.zip`, buffedInput)

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