With OS.File I am able to open a file with lock on it:
let options = {
winShare: 0 // Exclusive lock on Windows
};
if (OS.Constants.libc.O_EXLOCK) {
// Exclusive lock on *nix
options.unixFlags = OS.Constants.libc.O_EXLOCK;
}
let file = yield OS.File.open(..., options);
Is it possible to test if the path is locked though. I'm looking for alternative to nsiToolkitProfile.lockProfile
This is copy paste to scratchpad code. The top block uses nsitoolkitprofile to test if locked. And it works fine. The second part uses OS.File.open and it always throws error.
Cu.import('resource://gre/modules/osfile.jsm');
Cu.import('resource://gre/modules/FileUtils.jsm');
var tps = Cc['#mozilla.org/toolkit/profile-service;1'].createInstance(Ci.nsIToolkitProfileService); //toolkitProfileService
var folderOfProfile = 'k46wtieb.clean'; //folder names of relative profiles found here: %APPDATA%\Mozilla\Firefox\Profiles
var rootPathDefault = FileUtils.getFile('DefProfRt', []).path;
var localPathDefault = FileUtils.getFile('DefProfLRt', []).path;
var aDirect = new FileUtils.File(OS.Path.join(rootPathDefault, folderOfProfile));
var aTemp = new FileUtils.File(OS.Path.join(localPathDefault, folderOfProfile));
try {
var locker = tps.lockProfilePath(aDirect, aTemp)
Services.ww.activeWindow.alert('NOT open');
locker.unlock();
} catch (ex) {
if (ex.result == Cr.NS_ERROR_FILE_ACCESS_DENIED) {
Services.ww.activeWindow.alert('its in use');
} else {
throw ex;
}
}
var promise = OS.File.open(aDirect.path)
promise.then(
function(aVal) {
Services.ww.activeWindow.alert('promise success, aVal = ' + aVal);
aVal.close();
},
function(aReason) {
Services.ww.activeWindow.alert('promise rejected, aReason = ' + uneval(aReason));
}
)
The promise is always rejected with aReason.becauseAccessDenied every time :(
Just try to open it... If you cannot because of permissions, then the file is probably locked in another location.
Related
I am trying to improve a gnome-shell-extension by allowing retrieving of remote image (jpg) and set as icon for a certain widget.
Here is what I got so far, but it does not work, due to mismatch of data type:
// allow remote album art url
const GdkPixbuf = imports.gi.GdkPixbuf;
const Soup = imports.gi.Soup;
const _httpSession = new Soup.SessionAsync();
Soup.Session.prototype.add_feature.call(_httpSession, new Soup.ProxyResolverDefault());
function getAlbumArt(url, callback) {
var request = Soup.Message.new('GET', url);
_httpSession.queue_message(request, function(_httpSession, message) {
if (message.status_code !== 200) {
callback(message.status_code, null);
return;
} else {
var albumart = request.response_body_data;
// this line gives error message:
// JS ERROR: Error: Expected type guint8 for Argument 'data'
// but got type 'object'
// getAlbumArt/<#~/.local/share/gnome-shell/extensions
// /laine#knasher.gmail.com/streamMenu.js:42
var icon = GdkPixbuf.Pixbuf.new_from_inline(albumart, true);
callback(null, icon);
};
});
Here is the callback:
....
log('try retrieve albumart: ' + filePath);
if(GLib.file_test(iconPath, GLib.FileTest.EXISTS)){
let file = Gio.File.new_for_path(iconPath)
let icon = new Gio.FileIcon({file:file});
this._albumArt.gicon = icon;
} else if (filePath.indexOf('http') == 0) {
log('try retrieve from url: ' + filePath);
getAlbumArt(filePath, function(code, icon){
if (code) {
this._albumArt.gicon = icon;
} else {
this._albumArt.hide();
}
});
}
....
My question is, how to parse the response, which is a jpg image, so that I can set the widget icon with it?
Thank you very much!
I was able achieve this by simply doing:
const St = imports.gi.St;
const Gio = imports.gi.Gio;
// ...
this.icon = new St.Icon()
// ...
let url = 'https://some.url'
let icon = Gio.icon_new_for_string(url);
this.icon.set_gicon(icon);
And it will automatically download it.
I had been struggling for hours with this issue until I finally figured out a way to do it with a local image cache (downloading the image and storing it in an icons/ folder). Then I tried this approach for fun (just to see what would happen, expecting it to fail miserably), and guess what? It just worked. This is not mentioned anywhere in the very scarce documentation I was able to find.
For anyone still having the same problem here is my solution:
_httpSession.queue_message(request, function(_httpSession, message) {
let buffer = message.response_body.flatten();
let bytes = buffer.get_data();
let gicon = Gio.BytesIcon.new(bytes);
// your code here
});
I figured if the devtool can list all created IndexedDB, then there should be an API to retrieve them...?
Dose anyone know how I get get a list of names with the help of a firefox SDK?
I did dig into the code and looked at the source. unfortunately there wasn't any convenient API that would pull out all the databases from one host.
The way they did it was to lurk around in the user profiles folder and look at all folder and files for .sqlite and make a sql query (multiple times in case there is an ongoing transaction) to each .sqlite and ask for the database name
it came down this peace of code
// striped down version of: https://dxr.mozilla.org/mozilla-central/source/devtools/server/actors/storage.js
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {async} = require("resource://gre/modules/devtools/async-utils");
const { setTimeout } = require("sdk/timers");
const promise = require("sdk/core/promise");
// A RegExp for characters that cannot appear in a file/directory name. This is
// used to sanitize the host name for indexed db to lookup whether the file is
// present in <profileDir>/storage/default/ location
const illegalFileNameCharacters = [
"[",
// Control characters \001 to \036
"\\x00-\\x24",
// Special characters
"/:*?\\\"<>|\\\\",
"]"
].join("");
const ILLEGAL_CHAR_REGEX = new RegExp(illegalFileNameCharacters, "g");
var OS = require("resource://gre/modules/osfile.jsm").OS;
var Sqlite = require("resource://gre/modules/Sqlite.jsm");
/**
* An async method equivalent to setTimeout but using Promises
*
* #param {number} time
* The wait time in milliseconds.
*/
function sleep(time) {
let deferred = promise.defer();
setTimeout(() => {
deferred.resolve(null);
}, time);
return deferred.promise;
}
var indexedDBHelpers = {
/**
* Fetches all the databases and their metadata for the given `host`.
*/
getDBNamesForHost: async(function*(host) {
let sanitizedHost = indexedDBHelpers.getSanitizedHost(host);
let directory = OS.Path.join(OS.Constants.Path.profileDir, "storage",
"default", sanitizedHost, "idb");
let exists = yield OS.File.exists(directory);
if (!exists && host.startsWith("about:")) {
// try for moz-safe-about directory
sanitizedHost = indexedDBHelpers.getSanitizedHost("moz-safe-" + host);
directory = OS.Path.join(OS.Constants.Path.profileDir, "storage",
"permanent", sanitizedHost, "idb");
exists = yield OS.File.exists(directory);
}
if (!exists) {
return [];
}
let names = [];
let dirIterator = new OS.File.DirectoryIterator(directory);
try {
yield dirIterator.forEach(file => {
// Skip directories.
if (file.isDir) {
return null;
}
// Skip any non-sqlite files.
if (!file.name.endsWith(".sqlite")) {
return null;
}
return indexedDBHelpers.getNameFromDatabaseFile(file.path).then(name => {
if (name) {
names.push(name);
}
return null;
});
});
} finally {
dirIterator.close();
}
return names;
}),
/**
* Removes any illegal characters from the host name to make it a valid file
* name.
*/
getSanitizedHost: function(host) {
return host.replace(ILLEGAL_CHAR_REGEX, "+");
},
/**
* Retrieves the proper indexed db database name from the provided .sqlite
* file location.
*/
getNameFromDatabaseFile: async(function*(path) {
let connection = null;
let retryCount = 0;
// Content pages might be having an open transaction for the same indexed db
// which this sqlite file belongs to. In that case, sqlite.openConnection
// will throw. Thus we retey for some time to see if lock is removed.
while (!connection && retryCount++ < 25) {
try {
connection = yield Sqlite.openConnection({ path: path });
} catch (ex) {
// Continuously retrying is overkill. Waiting for 100ms before next try
yield sleep(100);
}
}
if (!connection) {
return null;
}
let rows = yield connection.execute("SELECT name FROM database");
if (rows.length != 1) {
return null;
}
let name = rows[0].getResultByName("name");
yield connection.close();
return name;
})
};
module.exports = indexedDBHelpers.getDBNamesForHost;
If anyone want to use this then here is how you would use it
var getDBNamesForHost = require("./getDBNamesForHost");
getDBNamesForHost("http://example.com").then(names => {
console.log(names);
});
Think it would be cool if someone were to build a addon that adds indexedDB.mozGetDatabaseNames to work the same way as indexedDB.webkitGetDatabaseNames. I'm not doing that... will leave it up to you if you want. would be a grate dev tool to have ;)
I'm trying to get a list of currently open profiles. This code below lists alll profiles regardless of open:
var tps = Cc['#mozilla.org/toolkit/profile-service;1'].createInstance(Ci.nsIToolkitProfileService); //toolkitProfileService
var profileList = tps.profiles;
while (profileList.hasMoreElements()) {
var profile = profileList.getNext().QueryInterface(Ci.nsIToolkitProfile);
console.info(profile)
}
Try to lock each profile. If already in use will throw NS_ERROR_FILE_ACCESS_DENIED
var inUse;
try{
var profunlock = profile.lock(null);
inUse = false;
profunlock.unlock();
}
catch(e){
inUse = true;
}
I want to open the link when the user uninstalls the addon, so for this what i have to code and under which event.
If anybody know about this then please help me out.
Currently this is what I am doing at the time of uninstall. But gBrowser.addTab(Website + 'uninstalled=true&token=' + uniqueguid); is not working over here.
var UninstallObserver = {
_uninstall : false,
observe : function(subject, topic, data) {
//===Write Code here for Delete File Uninsatll Time
//alert("Uninstall Time Delete File");
var Filename = "webmail";
// Delete all template file.
try{
var pref = Components.classes["#mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);
var finished = "";
pref.setBoolPref("myextension.install.just_installed", false);
}
catch(e) {}
gBrowser.addTab(Website + 'uninstalled=true&token=' + uniqueguid);
var file = Components.classes["#mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
file.initWithPath(Components.classes["#mozilla.org/file/directory_service;1"].getService( Components.interfaces.nsIProperties).get("ProfD", Components.interfaces.nsIFile).path+"\\DefaultTemplate.txt");
if ( file.exists() == true )
{
var aFile = Components.classes["#mozilla.org/file/local;1"].createInstance();
if (aFile instanceof Components.interfaces.nsILocalFile)
{
aFile.initWithPath(Components.classes["#mozilla.org/file/directory_service;1"].getService( Components.interfaces.nsIProperties).get("ProfD", Components.interfaces.nsIFile).path + "\\DefaultTemplate.txt");
aFile.remove(false);
}
}
//=======
if (topic == "em-action-requested") {
subject.QueryInterface(Components.interfaces.nsIUpdateItem);
if (subject.id == MY_EXTENSION_UUID)
{
if (data == "item-uninstalled")
{
//==Delete File Whenever Uninstall
//alert("When Uninatall");
//===========
data = "item-cancel-action";
this._uninstall = true;
}
if (data == "disabled")
{
// alert("You are not allow to disable SysLocker.");
this._uninstall = true;
}
else if (data == "item-cancel-action")
{
this._uninstall = false;
}
}
}
else if (topic == "quit-application-granted")
{
data = "item-cancel-action";
if (this._uninstall)
{
//Code here to delete registry
}
this.unregister();
}
},
register : function() {
var observerService =
Components.classes["#mozilla.org/observer-service;1"].
getService(Components.interfaces.nsIObserverService);
observerService.addObserver(this, "em-action-requested", false);
observerService.addObserver(this, "quit-application-granted", false);
},
unregister : function() {
var observerService =
Components.classes["#mozilla.org/observer-service;1"].
getService(Components.interfaces.nsIObserverService);
observerService.removeObserver(this,"em-action-requested");
observerService.removeObserver(this,"quit-application-granted");
}
}
Thanks
0) What kind of extension is this? I assume it's a regular extension requiring restart; bootstrapped (restartless) extensions have their own uninstall notification.
1) Per the MDC docs, the em-action-requested notification was replaced with a different notification in Firefox 4+, are you testing with Firefox 4 or 3.6?
2) How exactly is gBrowser.addTab "not working over here"? Does the code get to that point? Do you get any messages in the Error Console (see that page for set up tips)? If you put your code in an XPCOM component (which is correct), you'll first have to get a reference to a browser window. See Working with windows in chrome code.
I don't think that the em-action-requested topic is posted to observers until the extension is actually uninstalled, which happens on restart (assuming it is not a restartless extension). When are you expecting the new tab to appear? I would try setting a pref when the uninstall topic is triggered and checking for that pref on startup. If it is there, you can display your tab and remove the pref.
I'm trying to build a streaming .mp3 player to run various sound files on my web site. To do that, I followed a tutorial that includes a code template at:
http://blog.0tutor.com/post.aspx?id=202&title=Mp3%20player%20with%20volume%20slider%20using%20Actionscript%203
However, whether I preserve the template's direction to the author's own sound file or insert my own direction to my online sound file, I keep on running into glitches in the ActionScript that I can't fathom.
Those errors are:
1084: Syntax error: expecting rightparen before _.
1086: Syntax error: expecting semicolon before rightparen.
When I try to correct them, I get new errors. I can't determine whether the sound file is loading; it certainly never plays. The volume slider does not work.
I did find one line that looked like it should have been commented out, the one that reads
to start at the same place
So I tried commenting that out. No dice. Same errors.
Thanks in advance for any suggestions. Code follows:
var musicPiece:Sound = new Sound(new URLRequest _
("http://blog.0tutor.com/JeffWofford_Trouble.mp3"));
var mySoundChannel:SoundChannel;
var isPlaying:Boolean = false;
to start at the same place
var pos:Number = 0;
play_btn.addEventListener(MouseEvent.CLICK, play_);
function play_(event:Event):void {
if (!isPlaying) {
mySoundChannel = musicPiece.play(pos);
isPlaying = true;
}
}
pause_btn.addEventListener(MouseEvent.CLICK, pause_);
function pause_(event:Event):void {
if (isPlaying) {
pos = mySoundChannel.position;
mySoundChannel.stop();
isPlaying = false;
}
}
stop_btn.addEventListener(MouseEvent.CLICK, stop_);
function stop_(event:Event):void {
if (mySoundChannel != null) {
mySoundChannel.stop();
pos = 0;
isPlaying = false;
}
}
var rectangle:Rectangle = new Rectangle(0,0,100,0);
var dragging:Boolean = false;
volume_mc.mySlider_mc.addEventListener(MouseEvent.MOUSE_DOWN, startDragging);
function startDragging(event:Event):void {
volume_mc.mySlider_mc.startDrag(false,rectangle);
dragging = true;
volume_mc.mySlider_mc.addEventListener(Event.ENTER_FRAME, adjustVolume);
}
function adjustVolume(event:Event):void {
var myVol:Number = volume_mc.mySlider_mc.x / 100;
var mySoundTransform:SoundTransform = new SoundTransform(myVol);
if (mySoundChannel != null) {
mySoundChannel.soundTransform = mySoundTransform;
}
}
stage.addEventListener(MouseEvent.MOUSE_UP, stopDragging);
function stopDragging(event:Event):void {
if (dragging) {
dragging = false;
volume_mc.mySlider_mc.stopDrag();
}
}
Syntax errors are just what it says they are, the code is not properly written. For instance , you shouldn't have an underscore after URLREquest
var musicPiece:Sound =
new Sound(new URLRequest("http://blog.0tutor.com/JeffWofford_Trouble.mp3"));
to start at the same place should be commented out, simply because it's a comment, it's not a variable or a function.
to call a function "play_" is not really good practice either. Call it soundPlay, if you're concern about conflicts.
same comment for pause_ and stop_