How to read binary file from data dir in main.js of firefox addon

Asked Jun 04 '15 at 19:37

Active Jun 04 '15 at 20:29

Viewed 83 times

I have a problem in developing firefox addon. I have a binary file in standard data/ dir. How can I get its contents (byte string) in main.js? I've tried a lot but no success. Thank you.

Well finally I got some progress:

var url = self.data.url("img.png")
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
xhr.overrideMimeType("application/octet-stream")
xhr.send();
console.log(xhr.response.lenght) //4325

But lenght != img.png! Why? Actually img.png size = 4552 bytes...

edited Jun 04 '15 at 20:29

asked Jun 04 '15 at 19:37

user3070377

I think you set `xhr.responseType='arraybuffer'` and that should give you an array buffer with binary data. See here: http://stackoverflow.com/questions/25492225/how-to-download-image-to-desktop-with-os-file – Noitidart Jun 04 '15 at 23:50
1

Thank you, responseType solves the problem (also switched to async request). – user3070377 Jun 05 '15 at 15:12
Nice @user3070377 async is the way to go – Noitidart Jun 05 '15 at 17:45
1

So as this is resolved can you please share your solution and accept it. – Noitidart Jun 05 '15 at 23:31

How to read binary file from data dir in main.js of firefox addon

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