Unable to write file using xul

Question

Trying to write a file inside windows temp directory using XUL code:

function writeFile_launch_application(utility_name,utility_path)
{
var data ='tasklist  /nh /fi "imagename eq '+utility_name+'" | find /i "'+utility_name+'">nul && (echo alerady running) || ("'+utility_path+'")';
//alert(data);
var file = Cc["@mozilla.org/file/directory_service;1"].
       getService(Ci.nsIProperties).
       get("TmpD", Ci.nsIFile);
        file.append("launch_application.bat");
        file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);

        // Then, we need an output stream to our output file.
        var ostream = Cc["@mozilla.org/network/file-output-stream;1"].
                      createInstance(Ci.nsIFileOutputStream);
        ostream.init(file, -1, -1, 0);

        // Finally, we need an input stream to take data from.
        const TEST_DATA = data;
        let istream = Cc["@mozilla.org/io/string-input-stream;1"].
                      createInstance(Ci.nsIStringInputStream);
        istream.setData(TEST_DATA, TEST_DATA.length);

        NetUtil.asyncCopy(istream, ostream, function(aResult) {
          if (!Components.isSuccessCode(aResult)) {
            // an error occurred!
          }
        })
}

But getting error:

Timestamp: 11/29/2012 11:03:09 PM
Error: ReferenceError: Cc is not defined
Source File: chrome://myaddon/content/overlay.js
Line: 199

I also tried to add below lines at the top of my code but it didn't solve above error:

Components.utils.import("resource://gre/modules/NetUtil.jsm");

Components.utils.import("resource://gre/modules/FileUtils.jsm");

score 1 · Answer 1 · answered Nov 30 '12 at 13:20

Cc and Ci are aliases for Components.classes and Components.interfaces respectively.

Depending on the context they might (or might not) be already defined.

In any case

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
const Cr = Components.results;

(you shouldn't tag your question as firefox-addon-sdk)

Tomasz Dzięcielewski · Answer 2 · 2012-11-30T08:07:11.980

0

When I'm developing my addon, I always try to replace Components.utils, Components.intefaces with Cu and Ci. To do that, first line in my file is:

const { Cc, Ci, Cu } = require('chrome');

Cc is Component.classes. Than you can use now

Cu.import("resource://gre/modules/FileUtils.jsm");
Cu.import("resource://gre/modules/NetUtil.jsm");

edited Nov 30 '12 at 08:07

answered Nov 30 '12 at 07:33

Tomasz Dzięcielewski

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Now its saying "require is not defined" – user1862780 Nov 30 '12 at 08:06
Are you using Addon Builder? I've had a lot of problem using it and now I develop with `cfx`. Try to close/refresh browser and clean its cache. – Tomasz Dzięcielewski Nov 30 '12 at 08:11
Try to use Addon Builder or other tool. I don't know, how exactly it works, but this can help you i.e. include needed libraries. You can make you addon private, so nobody can see it. – Tomasz Dzięcielewski Nov 30 '12 at 08:56
Did it help you? Post comment, because I wonder what is the solution. – Tomasz Dzięcielewski Nov 30 '12 at 11:26
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/20400/discussion-between-tomasz-dz-and-user1862780) – Tomasz Dzięcielewski Nov 30 '12 at 15:11

Unable to write file using xul

2 Answers2