Javascript readAsArrayBuffer from url

Question

Is it possible to read binary file from url?

var url = 'http://example.com/image/abc.jpg';
var reader= new FileReader();

reader.addEventListener('load', function () {
    // whatever
});
reader.readAsArrayBuffer(url);

Above example is not working (url is not a object).

var file = new File([""], "url");

is empty

I want to read the last 16 bytes from the file to compare with another. The file is on the same server. — , Aug 12 '16 at 10:21

score 1 · Answer 1 · edited May 23 '17 at 10:34

1

URL in your case is a string object. You need to use HTTP get in this case. HTTP GET request in JavaScript? and read the response.

edited May 23 '17 at 10:34

Community

1
1

answered Aug 12 '16 at 10:21

James

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score 1 · Accepted Answer · answered Aug 12 '16 at 10:26

You have to use HTTP GET to get the file. Maybe this is what you need?

function httpGetAsync(theUrl, callback) {
    var xmlHttp = new XMLHttpRequest();
    xmlHttp.onreadystatechange = function() { 
        if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
            callback(xmlHttp.response);
    }
    xmlHttp.open("GET", theUrl, true); // true for asynchronous 
    xmlHttp.send(null);
}

httpGetAsync("http://cdn.androidbeat.com/wp-content/uploads/2015/12/google-logo.jpg", res => console.log(res))

Javascript readAsArrayBuffer from url

2 Answers2