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• Lock file/content while being edited in browser. [migrated]

  - by codescope

  In one of my projects users are allowed to edit the same file. It is group work and max number of users in group is 4. It is rare that they will be editing at the same time but there is possibility of it. I am using ckeditor which displays the content. how I can lock the content while it is being edited? For the above case what will happen if one users open the content for editing and then never saves and leave window open. Is it possible to save the content, release the lock for editing by another users? If first user comes back to desk they should see the message that "content has been changed, please refresh". I am using php, mysql. Thanks

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• amixer volume controls applies twice

  - by user214604

  The volume increment or decrement is happening double the intended amount using amixer for my alsa driver using ./amixer -c 0 set Master 1- command. This happens becuase by default volume controls apply for both playback and capture moduels. My alsa driver config doesnt enabled any of the capture controls. even there is no capture enabled, the function from simple_none.c returns true for capture channel. All the capture volume controls are applied to my playback driver. static int is_ops(snd_mixer_elem_t *elem, int dir, int cmd, int val) case SM_OPS_IS_CHANNEL: return (unsigned int) val < s-str[dir].channels; ./amixer -c 0 set Master Playback 10+ ./amixer -c 0 set Master Playback 10 - ./amixer -c 0 set Master Capture 10+ ./amixer -c 0 set Master Capture 10 - I suspect capture is enabled by default in my system for alsa drivers. Let me know what are the things to ensure to disable the capture.

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• Connecting 2 PCs using USB-to-USB (male-male) cable

  - by Amirizzuan

  I found this while Googling around: http://www.hardwaresecrets.com/article/Connecting-Two-PCs-Using-a-USB-USB-Cable/248 But then, the solution given in the article is using Windows. Is there any Ubuntu equivalent to this? I would really love to SSH into my Ubuntu server via my Ubuntu laptop, just by connecting one end of the male USB to my laptop, and another end of the male USB to my server. I know I can always SSH into my server via the network, but then in this case of mine, there are cases the server is inside a secluded-secured network server room, and the only way for me to check things out is to go into the server room and open the keyboard console and monitor there. But, if I can just bring my laptop inside and connect to the USB there, then that would be cool. Any idea guys?

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• Open in explorer view not working SOMETIMES !!

  - by H(at)Ni

  Hello, As weird as it seems to anyone who used it before, most of the time explorer view does not work until some steps to be followed, but in my case it was working and sometimes randomly not working ! After spending hours of troubleshooting and collecting logs, Network traces, Fiddler traces, etc. I reached the solution from the Network trace. Although it seems strange, it was sending a PROPFIND request to the root directory "/" which was actually deleted. So, I came up to this important article that states that you must have a root site collection in your SharePoint web application in order to keep it in a supported state. http://support.microsoft.com/kb/2590564 And actually that explained it and solved the strange behavior as well. Cheers,

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• Like the work, like the pay but not comfortable with environment around. Do I change company or stay patient? [closed]

  - by essbeev

  I do like the kind of work I do in our company. I also like the compensations. But lately, something in work environment makes me uncomfortable, to such an extent that, for instance, after a week off from work - even if totally exhausted by other activities; I get healthier. What move I make so that both my career and my health get along well? How do I use this situation for betterment ? Is it advisable to change the company in such a case ?

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• VS2010 Gotcha: Inadvertently targeting the wrong framework

  I love VS2010s multi-framework targeting feature, yet it has bitten me in the rear-end more than once. The problem is that I have created projects in .NET 3.5 without realizing it, then at some point, when something doesnt work as expected, if Im lucky I discover the mistake. Typically, this happens after you have explicitly chosen .NET 3.5 as the target framework. Then every project after that will be .NET 3.5 until you explicitly choose .NET 4.0 again. This morning that wasnt the case. I was...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Initialize array in O(1) -- how is this trick called?

  - by user946850

  There is this pattern that trades performance of array access against the need to iterate it when clearing it. You keep a generation counter with each entry, and also a global generation counter. The "clear" operation increases the generation counter. On each access, you compare local vs. global generation counters; if they differ, the array has been reset. This has come up in StackOverflow recently, but I don't remember if this trick has an official name. Does it? One use case is Dijkstra's algorithm if only a tiny subset of the nodes has to be relaxed, and if this has to be done repeatedly.

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• How to remove items from an arraylist without shrinking the list [migrated]

  - by user73710

  I have a case where I am using the ArrayList to keep a list of items that are keyed by their position in the list. Other objects reference the ArrayList items by their position. If I delete one of the items from the list, I don't want the list to shrink because that would invalidate all other references to items in the list (e.g. item 2 is now in position 1). My solution to the shrinking array list problem is to null the position in the arraylist so that the list will not shrink. I am curious whether this will free the memory formerly held by the item at that position. If there is a better way to accomplish this requirement, I would like to know about it.

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• F# - When do you use a type class instead of a record when you do not want to use mutable fields?

  - by fairflow

  I'm imagining a situation where you are creating an F# module in a purely functional style. This means objects do not have mutable fields and are not modified in place. I'm assuming for simplicity that there is no need to use .NET objects or other kinds of objects. There are two possible ways of implementing an object-oriented kind of solution: the first is to use type classes and the second to use records which have fields of functional type, to implement methods. I imagine you'd use classes when you want to use inheritance but that otherwise records would be adequate, if perhaps clumsier to express. Or do you find classes more convenient than records in any case?

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• Visual Studio 2010 Videos Refresh

  The DevExpress Channels video content is getting an IDE makeover. New videos and screencasts will use the Visual Studio 2010 IDE with DXperience v2010.x release. Some of the popular older videos are also getting re-recorded to show off new and changed product features. For example, this week youll see old (and some new) videos about the versatile and multi-platform reporting suite: XtraReports. In case you didn't know, from DXperience v2010.1 onwards, XtraReports works on these platforms:...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Variable-step update() in game loop is falling behind, how can I get around this?

  - by ThatsGobbles

  I'm working on a minimal game engine for my next game. I'm using the delta update method like shown: void update(double delta) { // Update code that uses `delta` goes here } I have a deep hierarchy of updatable objects, with a root updatable that contains several updatables, each of which contains more updatables, etc. Normally I'd just iterate through each of the root's children and update each one, which would then do the same for its children, and so on. However, passing a fixed value of delta to the root means that by the time the leaf updatables are reached, it's been longer since delta seconds that have elapsed. This is causing noticable desyncing in my game, and time synchronization is very important in my case (I'm working on a rhythm game). Any ideas on how I should tackle this? I've considered using StopWatches and a global readable timer, but any advice would be helpful. I'm also open to moving to fixed timesteps as opposed to variable.

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• What is the most handy function you've ever came across? [closed]

  - by Viniyo Shouta

  Obviously everything is 'handy' when it comes to programming terms, but some get a highlight spot, like containers, matrix trasnformation functions and many others. But in this case please mention the one it was more handy to you, saved you from sparing hours resolving a problem, or even the one you like more, What is it and what does it does? I'll start with an example. Language: C++ Function: std::sort (STL) What does it does: Arranges the elements in a specified range into a nondescending order or according to an ordering criterion specified by a binary predicate. (It arranges a container in decreasing order) Why of this question? Because I want to learn how to if possible make my own implementations of these functions for pure studying purposes, to enhance knowledge

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• Systray not showing

  - by tnrgus

  I have an application called foo that runs as root. The foo calls system function to execute the other application which show tray icon using Qt. The Systray Icon Example in Qt is working properly in user account but not in root. I run the following command to drop privileges: system(“exec su -l user -c ‘export DISPLAY=:0; /opt/systray &’”); However, the systray icon doesn’t appear in Ubuntu 13.10 & 14.04. Is there any way to display this systray in this case except for the solution that uses a PPA that comes with to re-enable the systray whitelist?

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• How to start learning Programming? [on hold]

  - by user107080

  Most of the time people ask which programming language to learn which I know is not valid question to ask here and I don't care about 'which' here, I care about 'How'. So, how do I start learning programming from scratch? in other words, what are the steps for absolute beginner to learn programming the right way? I'm sure buying a book and reading it is not the only way in this case. Again, I don't want to ask which but I want also to know if there are specific languages that will make my start as solid as possible because I know that some can hurt my mindset of programming point of view.

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• Partition Hard Drive For Data

  - by user211779

  Greetings ~ I am a new Linux/Ubuntu user. For various reasons (mostly my own ignorance) I am on my third install of Ubuntu 12.04. I want to partition the hard drive to create a drive for data and personal files in case I ever have to install again. I have been struggling all afternoon to make a gparted live USB. Tuxboot looked like the answer but I get an error message when using it. So, I am asking for help. Ultimately, I want to partition the hard drive for data and personal files. What do you recommend?

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• How do I get the wireless card on a Lenovo S205 working?

  - by user206829

  I tried to install 12.04, 13.04, and now 13.10 on the machine and followed all the instructions that made sense that I could find and still have not gotten wifi to work. It keeps it hard blocked for some reason, not sure why and not sure anyone out there either has figured it out because I would have found it on Google. When I boot from the formatted USB drive, I have WiFi and everything working, why doesn't work after the USB drive is removed? What driver is the USB/wubi or whatever using so that I can install it and have things working? I could have used wubi and installed Ubuntu like that, but I want to make this machine a fully dedicated Ubuntu machine. The laptop is a Lenovo S205 in case anyone can help. I really would like to use 12.04 or higher, i don't want to downgrade to an older version of Ubuntu if at all possible.

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• Large Sprite Performance

  - by Iansen

  I've got a large Sprite generated using a set of vertices(x,y coordinates) and a bitmap pattern (using moveTo, lineTo, beginBitmapFill, endFill ...etc). It's about 15000 pixels wide and between 1500 - 2000 pixels high depending on the level -it's the terrain for a 2D game. My question is: what is the best way to display/move it on the stage - performance wise? Currently I'm just adding it to the stage as is...I get decent frame rate/ memory/ cpu usage but I want to optimize it for slower PCs. Any ideas? I've been reading a little about blitting but I'm not sure how to implement it in my case. Thanks.

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• Mac HDD Is Encrypted

  - by user206844

  I have the hard drive from a PowerMac G5, which was my old computer before it died and I upgraded to Ubuntu Studio. The hard drive its self still works well, but on Ubuntu I can't access most of the files. I plugged it into my MacBook Air and changed some of the perms on some of the folders as a test. This worked for a few, but for others, I was getting the same message Cannot access folder. Access denied. I would like to use this as an external HDD (I have a case and everything), but it's kind of pointless if I can't access the folders that I want. After looking around for a couple of hours, I couldn't find anything that actually gave me an answer. I would like to know if: Anybody else has come upon this problem, If so, have you found a solution? and, What is it?

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• What is wrong with this code for reading binary files? [on hold]

  - by qed

  What is wrong with this code for reading binary files? It compiles OK, but will not print out the file as planned, in fact, it prints nothing at all. #include <iostream> #include <fstream> int main(int argc, const char *argv[]) { if (argc < 2) { ::std::cerr << "usage: " << argv[0] << " <filename>\n"; return 1; } ::std::basic_ifstream<unsigned char> in(argv[1], ::std::ios::binary); unsigned char uc; while (in.get(uc)) { printf("%02X ", uc); } // TODO: error handling, in case the file could not be opened or read return 0; }

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• Detect blocked popup in Chrome

  - by Andrew

  I am aware of javascript techniques to detect whether a popup is blocked in other browsers (as described in the answer to this question). Here's the basic test: var newWin = window.open(url); if(!newWin || newWin.closed || typeof newWin.closed=='undefined') { //POPUP BLOCKED } But this does not work in Chrome. The "POPUP BLOCKED" section is never reached when the popup is blocked. Of course, the test is working to an extent since Chrome doesn't actually block the popup, but opens it in a tiny minimized window at the lower right corner which lists "blocked" popups. What I would like to do is be able to tell if the popup was blocked by Chrome's popup blocker. I try to avoid browser sniffing in favor of feature detection. Is there a way to do this without browser sniffing? Edit: I have now tried making use of newWin.outerHeight, newWin.left, and other similar properties to accomplish this. Google Chrome returns all position and height values as 0 when the popup is blocked. Unfortunately, it also returns the same values even if the popup is actually opened for an unknown amount of time. After some magical period (a couple of seconds in my testing), the location and size information is returned as the correct values. In other words, I'm still no closer to figuring this out. Any help would be appreciated.

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• jQuery FullCalendar - trying to add event and display on calendar failed

  - by Michael Mao

  Hi all: I am trying to work out how to use Adam Shaw's brilliant jQuery plugin - FullCalendar to add an event on our project : online balloon ordering page under development Basically, if you click on "step1" and choose "pickup in shop" , the page will bring you to the calendar view, where you could click on the upper-right corner at the "week" button to alter the view to a weekly basis. What I am trying to achieve is when client clicks on an empty slot in a day, she can create her event on that spot. Here is my code in custom.js: dayClick: function() { var n = parseInt(this.className.match(/fc\-slot(\d+)/)[1]); alert('a day has been clicked on slot ' + n); //trying to add an event using the renderEvent() method. $('#' + type + 'Calendar').fullCalendar('renderEvent', { title : 'my pickup slot', start : new Date(y,m,d, 12, 30), end : new Date(y,m,d, 13, 00), }); } It tries to use the FullCalendar's API method renderEvent so to create such an event. However, although my code runs without error and I can see the prompt saying which slot has been clicked, It wouldn't render such an new event on calendar. Is there another way to do this or my code does something wrong? Any suggestion would be much appreciated, thanks a lot in advance.

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• What good technology podcasts are out there?

  - by Michael Stum

  Yes, Podcasts, those nice little Audiobooks I can listen to on the way to work. With the current amount of Podcasts, it's like searching a needle in a haystack, except that the haystack happens to be the Internet and is filled with too many of these "Hot new Gadgets" stuff :( Now, even though I am mainly a .NET developer nowadays, maybe anyone knows some good Podcasts from people regarding the whole software lifecycle? Unit Testing, Continous Integration, Documentation, Deployment... So - what are you guys and gals listening to? Please note that the categorizations are somewhat subjective and may not be 100% accurate as many podcasts cover several areas. Categorization is made against what is considered the "main" area. General Software Engineering / Productivity Stack Overflow TekPub (Requires Paid Subscription) SE Radio 43 Folders Perspectives Dr. Dobb's (now a video feed) The Pragmatic Podcast (Inactive) IT Matters Agile Toolkit Podcast The Stack Trace (Inactive) Parleys Techzing The Startup Success Podcast Berkeley CS class lectures FOSS Weekly .NET / Visual Studio / Microsoft Herding Code Hanselminutes .NET Rocks! Deep Fried Bytes Alt.Net Podcast Polymorphic Podcast Sparkling Client (The Silverlight Podcast) dnrTV! Spaghetti Code ASP.NET Podcast Channel 9 Radio TFS PowerScripting Podcast The Thirsty Developer Elegant Code ConnectedShow Crafty Coders Coding QA jQuery yayQuery The official jQuery podcast Java / Groovy The Java Posse Grails Podcast Java Technology Insider Ruby / Rails Railscasts Rails Envy The Ruby on Rails Podcast Rubiverse Web Design / JavaScript / Ajax WebDevRadio Boagworld The Rissington podcast Ajaxian YUI Theater Unix / Linux / Mac / iPhone Mac Developer Network Hacker Public Radio Linux Outlaws Mac OS Ken LugRadio Linux radio show (Inactive) The Linux Action Show! Linux Kernel Mailing List (LKML) Summary Podcast Stanford's iPhone programming class SysAdmin, Security or Infrastructure RunAs Radio Security Now! Crypto-Gram Security Podcast Hak5 VMWare VMTN Windows Weekly PaulDotCom Security The Register - Semi-Coherent Computing FeatherCast General Tech / Business Tekzilla This Week in Tech The Guardian Tech Weekly PCMag Radio Podcast Entrepreneurship Corner Manager Tools Other / Misc. / Podcast Networks IT Conversations Retrobits Podcast No Agenda Netcast Cranky Geeks The Command Line Freelance Radio IBM developerWorks The Register - Open Season Drunk and Retired Technometria Sod This Radio4Nerds Hacker Medley

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• Determine size of SizeToContent WPF Window before its rendered

  - by DudeFX

  I have a window in my WPF application that is displayed on occasion. When it is shown it is faded in with an annimation, and when closed it is faded out. Nothing fancy, just a storyboard that modifies the opacity. Actually the window is never really closed, the opacity is just faded out to 0 where it remains until its to be displayed again. This window is an informative window and doesn't always show the same content. It is sized to content (Width and Height) and works well in that regard. The user chooses the basic area of the screen for it to be displayed (TopLeft, TopRight, Center, BottomLeft, BottomRight). Before the window is faded in the content is updated. Because the window is sized to content it increases or descreases in size. The width and height can change. When positioning the window, lets say, in the bottom right corner, I simply take the WorkingArea of the screen (width and height) and then minus the width/height of the window to get the Top and Left position that I need. The logic works, but the trouble I am having is the Window's Height and Width is not returning the size it is after the content was updated, but is returning the size it was the last time it was displayed. I am assuming this is because it hasn't yet been rendered with the new content. This causes me grief becuase if the Window is larger than it was the last time it obviously extends off the screen. I tried positioning the window in the OnContentRendered event, but this only fires once when the Window is created, not after the content has been updated, when the opacity is set to 0. Does anyone have any idea how I might get an accurate width and height of this window before it is faded in? Any help would be appreciated!!

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• WPF: Adorner Hit Testing / MouseDown Event

  - by stefan.at.wpf

  Hello, I have an Adorner which adornes a Border (please see screenshot below). The MouseDown Event for the Adorner is however only raised, when clicking on an element in the adorner. I need the MouseDown Event to be raised, when clicking on any place in the adorner above the adorned element. How can this be done? Do I have to add an transparent control in the adorner or is there another way for this? Thanks for any help! Screenshot and VS 2008 Project: http://cid-0432ee4cfe9c26a0.skydrive.live.com/browse.aspx/%C3%96ffentlich?uc=2 The Code for the adorner: class myAdorner : Adorner { public myAdorner(UIElement element) : base(element) { this.MouseDown += new System.Windows.Input.MouseButtonEventHandler(myAdorner_MouseDown); } void myAdorner_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e) { MessageBox.Show("ok"); } // Draws two rectangles: one in the upper-left and another one in the lower-right corner protected override void OnRender(System.Windows.Media.DrawingContext drawingContext) { Size size = this.AdornedElement.RenderSize; Rect r1 = new Rect(0.5, 0.5, 20, 20); Rect r4 = new Rect(size.Width - 20.5, size.Height - 20.5, 20, 20); SolidColorBrush brush = new SolidColorBrush(Colors.AliceBlue); Pen pen = new Pen(Brushes.Black, 1); drawingContext.DrawRectangle(brush, pen, r1); drawingContext.DrawRectangle(brush, pen, r4); } }

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• How * tag can be used in CSS?

  - by php html

  I'm trying to understand how a background image is used in a css button. It seems the image is much larger than the button, still the corners are matched to the button(resulting a rounded corner button). It seems it is related to .btn *. I couldn't find any reference about how * can be used. Can you explain how the image is rendered in the button, using the * tag? I assume * will match any element. However I don't get it how in this case the image is rendered like this. .btn { display: block; position: relative; background: #aaa; padding: 5px; float: left; color: #fff; text-decoration: none; cursor: pointer; } .btn * { font-style: normal; background-image: url(btn2.png); background-repeat: no-repeat; display: block; position: relative; } full example here: http://monc.se/kitchen/59/scalable-css-buttons-using-png-and-background-colors/

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