J'essaie de lire une image côté client codée en base64. Comment lire avec nodejs?
Mon code:
// 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.
});
}
})
Mais j'ai eu cette erreur:
In read file
[Error: Path must be a string without null bytes.]
* SOLUTION *
lwip
accepte le tampon dans la méthode open.
// add to buffer base64 image from step
var encondedImage = new Buffer(image.name, 'base64');
// check err
lwip.open(encondedImage, 'jpg', function(err, image){
// image.resize(..), etc
});
Je pense que l'exemple suivant montre ce dont vous avez besoin: http://www.hacksparrow.com/base64-encoding-decoding-in-node-js.html
L'essence de l'article est cette partie de code:
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');
Dernière et meilleure façon de faire cela:
const fs = require('fs');
fs.readFileSync('/path/to/file.jpg', { encoding: 'base64' });
var fs = require('fs');
function base64Encode(file) {
var body = fs.readFileSync(file);
return body.toString('base64');
}
var base64String = base64Encode('test.jpg');
console.log(base64String);