Convert Base64 Encoded String Back to an Image and Write to Disk

[Joe McCann]

I'm sure this is possible, but am turned around on it right now:

https://gist.github.com/711297

Essentially, I'm taking a jpeg image, converting to a Base64 encoded
string and now need to decode it and write it back to disk as a jpeg.

The gist includes a really long base64 encoded string so here is the
gist of the gist:

var fs = require('fs'),
sys = require('sys'),
base64 = require('base64'); // this module is installed.

var filename = 'test.jpg'

var foo = "a-really-long-base64-encoded-string";

fs.write(__dirname + "/" + filename, base64.decode(foo), 0,
foo.length, null, function(err, written) {
if (err) throw err;
console.log(written)
});

Thanks in advance.

[Joe McCann]

I also tried converting foo to a Buffer:

var bar = new Buffer(foo);

// also tried:

var bar = new Buffer(foo, 'base64');


fs.write(__dirname + "/" + filename, bar, 0, foo.length, null,

[Liam]

Did you try fs.writeFile? fs.write is used (possibly repeatedly)
between fs.open & fs.close

Also for a data source that's a Stream, you can use
fs.createWriteStream and util.pump...

[mscdex]

On Nov 23, 12:52 am, Joe McCann <joseph.is...@gmail.com> wrote:
> I also tried converting foo to a Buffer:
>
> var bar = new Buffer(foo);
>
> // also tried:
>
> var bar = new Buffer(foo, 'base64');
>
> fs.write(__dirname + "/" + filename, bar, 0, foo.length, null,

The first parameter to fs.write() is a file descriptor, not a
filename. As Liam suggested, fs.writeFile() is probably what you want
instead.

[Joe McCann]

I tried fs.writefile as well and no luck.

[Ben Noordhuis]

On Tue, Nov 23, 2010 at 15:34, Joe McCann <joseph...@gmail.com> wrote:
> I tried fs.writefile as well and no luck.

Could you gist[1] your code?

[1] https://gist.github.com/

[Joe McCann]

There is a gist...see the original.

https://gist.github.com/711297

On Nov 23, 8:42 am, Ben Noordhuis <i...@bnoordhuis.nl> wrote:

[Ben Noordhuis]

On Tue, Nov 23, 2010 at 16:14, Joe McCann <joseph...@gmail.com> wrote:
> There is a gist...see the original.
>
> https://gist.github.com/711297

Sorry, seems I didn't get your original e-mail. The below works for
me, result is an image of a keyboard.

var data = /* snip */;
buffer = new Buffer(data, 'base64');
console.log(data.length, buffer.length);
require('fs').writeFileSync('image.jpg', buffer, 0, buffer.length);

[Joe McCann]

Sweet! Thx Ben. And yes, it is supposed to be a keyboard.

On Nov 23, 9:45 am, Ben Noordhuis <i...@bnoordhuis.nl> wrote:

[Joe McCann]

Damn, actually that didn't work.

I'm wondering if it is because I'm running node 0.2.3?

I'm using express which doesn't support 0.3.+ yet.

Gonna try with node 0.2.5

[Ben Noordhuis]

The base64 encoder/decoder in 0.2.x is slightly buggy. This patch[1]
might be necessary.

[1] https://github.com/ry/node/issues/#issue/402

[Joe McCann]

Updated node to 0.2.5 and it works fine. Express, unofficially,
supports 0.2.5 as of today as well (according to TJ in the IRC room).

[Robert Kieffer]

Check out this issue - in particular the gist, which does what you
describe.

On Nov 22, 9:50 pm, Joe McCann <joseph.is...@gmail.com> wrote: