how to convert image to base64 js

[victor.t...@gmail.com]

hello try to convert image to base64 and send to twitter 

 vertx.fileSystem.readFile('media/test5.jpg', function(err, res) {

                if (!err) {   

               //res is a buffer   .toString('utf-16'); in nodejs have 'base64' option    

              //vertx has a similar option ? only worked utf8 and utf16

                 var resString=res.toString();  //    .toString() return ï¿½ï¿½ï¿½ï¿½\u0000\u0010JFIF.............          

                resString = rstr2b64(resString);//my function encode_base64() work fine but dont return correct string ÿØÿà JFIF.........

                     replier(resString);

                }

                if (err){

                    console.log("ERROR"+err.toString());

                }

            });

[Alexander Lehmann]

You can use the base64 class from jdk if you are using java8, something like:

Base64.getEncoder().encodeToString(res.getBytes());

[Alexander Lehmann]

sorry, that only works in Java

[victor.t...@gmail.com]

im using js but is possible add a class from java8 in js ?

[Tim Fox]

There's more information on this in the Nashorn docs, but you should be able to do something like:

java.util.Base64.getEncoder()

to get an encoder

https://docs.oracle.com/javase/8/docs/technotes/guides/scripting/nashorn/api.html

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[Julien Viet]

I think one issue will be to extract the byte[] from the wrapped JS Buffer, unless the delegate is used.

-- 
Julien Viet
www.julienviet.com

[Tim Fox]

Surely there's a JS Base64 library somewhere?

[Clement Escoffier]

Hi,

Yes, there are methods implemented natively by “recent” browsers:

https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding

Seems to be largely supported:

http://caniuse.com/#search=btoa

Cheers,

Clement

[victor.t...@gmail.com]

I think one issue will be to extract the byte[] from the wrapped JS Buffer, unless the delegate is used.

-- 
Julien Viet
www.julienviet.com

tnks  i get byte array from buffer and encode b64  my mod for twitter is completed =P

vertx.fileSystem.readFile(img.path, function(err, res) {

            if (!err) {              

                var resByte = [];

                for (var i = 0; i < res.length(); i++) {

                    resByte[i] = res.getByte(i);

                }

                var imgdata = "--" + boundary + "\r\n" +

                    'Content-Disposition: form-data; name="media_data"\r\n\r\n' +

                    base64ArrayBuffer(resByte) + "\r\n" +

                    '--' + boundary + '--';             

                doRequest(method, path, oAuth, imgdata, replier);

            } else {

                replier("ERROR: " + err.toString());

            }

        });