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  • Creating a Lazy Sequence of Directory Descendants in C#

    My dear friend Craig Andera posted an implementation of a function that descends into a directory in a "lazy" manner, i.e. you get the first descendant back right away and not after all descendants have been calculated. His implementation was in Clojure, a Lisp variant that runs on the Java VM: (import [java.io File])(defn dir-descendants [dir]  (let [children (.listFiles (File. dir))]    (lazy-cat      (map (memfn getPath) (filter (memfn isFile) children))...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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  • Black screen on Ubuntu 12.04

    - by user1648371
    I've just upgraded to Ubuntu 12.04 and I'm experiencing some problems. The first thing I noticed is that when I click the Workspace switcher all I get is a black screen (I can guess where the different workspaces are located and clicked on them, not a practical solution though). In addition when I lock the screen or suspend the laptop (a Vaio VPCEB4M1E) I get a shifted screen (I see the right most vertical stripe on the left size of the monitor and nothing about all the rest, to put it clearly I can see the gear that allows me to turn the pc off, etc, but not much more..) when I go to the additional driver menu I see the "ATI/AMD proprietary FGLRX graphics driver" are installed and the post-release update version is available. I don't know if the problem is driver related, so before doing anything I'd like to get some suggestions from you guys. Thanks you!

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  • How to force update-grub to use UUID?

    - by user276851
    When I run "update-grub", the file "grub.cfg" will contain lines like this. menuentry 'Ubuntu...' { ... linux /boot/vmlinuz... root=/dev/md124 ... ... } For the line of linux, is it possible to let it use UUID? Like, linux /boot/vmlinux... root=UUID=xxx Right now, every time after I do update-grub, I have to manually edit the line to use UUID. Otherwise, the boot will fail. Thanks for the help.

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  • Business Analyst vs. Architect [closed]

    - by suslik
    I'm a developer of a few years in the financial industry and will soon need to decide what career path to try and row towards. Broadly speaking I have two options: something more 'people' oriented like BAs, or keep coding and try to make more technical decisions like the Architects do where I currently work. Here are my perceptions right now: Business Analysts: get paid way more than devs once they do their job, it seems like they usually have no worries more likely to go REALLY high up in the organization (VPs, etc) Architects: things like certification matters (I see this as a con) called in when things go wrong more than anyone else (weekends & overtime) long career path to get to (dev - senior dev - team lead - architect) I would find the latter more intellectually rewarding, but when I look at it I just can't justify it in terms of lifestyle. Am I wrong / what am I missing? Can you really make a lot of money in a technical role or must you really get out of coding? Thank you for any constructive input.

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  • Dynamic Strategy Pattern [migrated]

    - by Karl Barker
    So I'm writing a web service architecture which includes FunctionProvider classes which do the actual processing of requests, and a main Endpoint class which receives and delegates requests to the proper FunctionProvider. I don't know exactly the FunctionProviders available at runtime, so I need to be able to 'register' (if that's the right word) them with my main Endpoint class, and query them to see if they match an incoming request. public class MyFunc implements FunctionProvider{ static { MyEndpoint.register(MyFunc); } public Boolean matchesRequest(Request req){...} public void processRequest(Request req){...} } public class MyEndpoint{ private static ArrayList<FunctionProvider> functions = new ArrayList<FunctionProvider>(); public void register(Class clz){ functions.add(clz); } public void doPost(Request request){ //find the FunctionProvider in functions //matching the request } } I've really not done much reflective Java like this (and the above is likely wrong, but hopefully demonstrates my intentions). What's the nicest way to implement this without getting hacky?

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  • What's a good way to store a series of interconnected pipe and tank objects?

    - by mars
    I am working on a puzzle game with a 6 by 6 grid of storage tanks that are connected to up to 4 tanks adjacent to them via pipes. The gameplay is concerned with combining what's in a tank with an adjacent tank via the pipe than interconnects them. Right now I store the tanks in a 6x6 array, vertical pipes in a 5x6 array, and horizontal pipes in a 6x5 array. Each tank has a reference to the object that contains both tanks and pipes and when a pipe needs to be animated filling with liquid, the selected tank just calls a method on the container object telling it to animate the pipes it is connected to (subtract 1 from row or column to find connected pipes). This feels like the wrong way of doing it, as I've also considered just giving each tank references to the pipes connected to it to access directly.

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  • How to remove package in bad state, software center freezes, no synaptic

    - by GothicMonster
    When 'Update Manager' starts running, it tells me that I need to do a 'Partial Upgrade', when I start doing the upgrade, it tells me "Remove package in bad state The package 'linux-headers-3.0.0-19' is in an inconsistent state and needs to be reinstalled, but no archive can be found for it. Do you want to remove this package now to continue?" When I click 'Yes' the program just closes. I have tried to go into the software center and reinstall the 'linux-headers-3.0.0-19' ubuntu software center just freezes. Right now I cannot run 'Synaptic', or remove any software. Please help!

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  • Which are the options available for PHP IDEs for windows

    - by dbz_a
    Hi, I am new to PHP (Have good j2EE and ASP .net experience) and now want to kick start developing a simple website (A database connection and simple inserts is the max technical stuff i plan right now). I have signed up at zymic for a free hosting (MySql included). Now please suggest me: the available IDEs for developing on PHP on windows OS and any beginner level resources that you have come across, for a .net/java guy which may help me to quickly figure out the differences would you advice me to go for frameworks like joomla etc as a beginner? or is it better i start exploring these after im familiar with PHP? Thanks in advance, Abhi

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  • Dell L501X Display Port Screen issue

    - by jdflorezPA
    I got a Dell XPS L501X with a mini display port to VGA connector for my External Screen. On Displays it shows me: Acer Technologies 24" (which is the monitor) but only lets me up to 1024x768 resolution (The native resolution of this monitor is 1920x1200). I tried adding a new mode with xrandr, but when I applied it, it reverted back to 1024x768. As far as I know, the display port is controlled by the Intel card, right? Any ideas or suggestions would be appreciated. Thanks Using Ubuntu 11.10 32bit

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  • How to "undo" (revert) Ctrl+L?

    - by zharvey
    I'm on 12.04 Desktop. When browsing the file system, it's convenient to type Ctrl+L so as to get the file path "Location" to render as a string; I can then modify the file path or even paste something in and get redirected right where I want to go. But often, after typing Ctrl+L, I find myself wanting to revert back to the normal way Nautilus renders the file path (as a series of buttons/links). What's the magical shortcut to "undo" Ctrl+L and go back to "normal mode"? Thanks in advance!

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  • How do I replace Unity?

    - by Krista O'Connors
    I wanted to use Ubuntu 12.04 for its long term support. But I cannot stand Unity. I cannot find a way to replace it with compizconfig, so I tried replacing it with Lubuntu. When I restarted my computer started to load lubuntu, then just went right on with ubuntu as if nothing had happened. Likewise, it shows lubuntu when it shuts down. What is the deal? I'm confused here, is ubuntu 12.04 supposed to be an operating system or a desktop interface? Can I even run ubuntu with a Lubuntu interface? Is there a way to do this in compizconfig that I should be doing instead?

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  • Reduced Tree View in NetBeans IDE 7.2

    - by Geertjan
    Right-click within the Projects window in NetBeans IDE 7.2 and from the "View Java Packages As" menu, you can now choose "Reduced Tree".I never really understood the difference between "Reduced Tree" and the already existing "Tree". But it makes sense when you see it. Here's Reduced Tree view: And here's Tree view, where you can see that the "actions" and "nodes" packages above each have their own top level package nodes, which takes up more space than the above: What's cool is that your selected package view is persisted across restarts of the IDE. To be complete, here's the List view, which is the third option you have in the "View Java Packages As" menu: Seems to me like the new Reduced Tree view combines the best of the Tree view with the best of the List view! Related issue: http://netbeans.org/bugzilla/show_bug.cgi?id=53192

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  • Dependency Properties Made Easy

    ok so I found that for some reason I thought I did a post on this before and I couldn't find it. So I thought I would make a new post as simple as possible. Here is a simple dp:public readonly DependencyProperty ResistanceProperty = DependencyProperty.Register("Resistance", typeof(double), typeof(AnimatingPanelBase), null);public double Resistance{get{return (double)GetValue(ResistanceProperty);}set{SetValue(ResistanceProperty, value);}}Nice and simple right? why bother you ask, well the biggest...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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  • Screen Resolution Problem with Ubuntu 14.04 and VirtualBox

    - by user3341257
    Environment: Lenovo T530 running Windows 7. Have installed Ubuntu 14.04 on a virtual machine using VM Virtual Box. Have installed all the updates from both Virtual Box and Ubuntu. Problem: While in Ubuntu's desktop and other Ubuntu initiated programs, the window is reduced to about 3x4 inches showing in the middle of the rest of my regular Virtual Box window. I am seeing only the upper right hand of the screen output of what I would normally see. Please help. I've seen How do I install Guest Additions in a VirtualBox VM? But, none of these answers works in 14.04.

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  • Fujitsu B6220 laptop, sometimes my desktop freezes upon resume from standby

    - by user89756
    I installed Ubuntu 11.10 on my Fujitsu Lifebook B6220 laptop just before 12.04 was released. I can not remember if I had this issue with Ubuntu 11.10 as I updated the install to 12.04 about a week after 12.04 came out. My problem is that sometimes upon resume from standby my desktop is frozen. The keyboard, touch pad, and touchscreen work, but there is no response from the desktop. I can ctrl-alt-f2 and log in and then from there I just reboot the computer. This happens about 50% of the time when I resume from standby but I have not noticed a distinct pattern. I have thought about reinstalling 12.04, since I upgraded 11.10 to 12.04 instead of a fresh install. But I have customized my laptop a lot and I would prefer to avoid reinstalling it, I'm not even sure if that would fix it. Anyone have a idea what might be the problem? If I should submit this as a bug, could someone point me in the right direction please? Thanks, Matt

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  • Are these hacking attempts or something less sinister?

    - by Darkcat Studios
    I just had a look through our web server error logs, and Terminal services is reporting: "Remote session from client name a exceeded the maximum allowed failed logon attempts. The session was forcibly terminated." Hundreds of times, every 10.5 seconds or so for a period of about 5-10 minutes, once at 2pm yesterday and once again at about 1am this morning. We CURRENTLY have RDP open to the outside, as I am just completing the setup and now and then I/Others need to jump on from an outside office/location (VPN isn't an option) As these are so regular, am I right in assuming that they may be the result of some sort of dictionary attack? or could something like an internal admin's hung session cause such a mass of events? (Win Server 2008 R2)

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  • What kind of programmer job positions are there in professional game development? [on hold]

    - by skiwi
    I have been wondering the following since recently, seeing as I want to pursue a career in game development after university: What programmer job positions are there in professional game development? Think about AAA titles, etc. What programming language are the most commonly used ones in that area? I can think of some job aspects, like game engine, network, centralized server and artificial intelligence. I am just wondering what options I have later on, and in what programming languages I should invest right now. I am quite proficient with Java, and also wondering if that is of any help.

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  • How can I keep straight alpha during rendering particles?

    - by April
    Rencently,I was trying to save textures of 3D particles so that I can reuse the in 2D rendering.Now I had some problem with alpha channel.Some artist told me I that my textures should have unpremultiplied alpha channel.When I try to get the rgb value back,I got strange result.Some area went lighter and even totally white.I mainly focus on additive and blend mode,that is: ADDITIVE: srcAlpha VS 1 BLEND: srcAlpha VS 1-srcAlpha I tried a technique called premultiplied alpha.This technique just got you the right rgb value,its all you need on screen.As for alpha value,it worked well with BLEND mode,but not ADDITIVE mode.As you can see in parameters,BLEND mode always controlled its value within 1.While ADDITIVE mode cannot guarantee. I want proper alpha,but it just got too big or too small consider to rgb.Now what can I do?Any help will be great thankful. PS:If you don't understand what I am trying to do,there is a commercial software called "Particle Illusion".You can create various particles and then save the scene to texture,where you can choose to remove background of particles. Now,I changed the title.For some software like maya or AE,what I want is called [straight alpha].

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  • Can't boot - "Waiting for Network Configuration"

    - by user213017
    After an update on 13.10, my PC won't boot Ubuntu any longer. It displays the infamous "Waiting for Network Configuration" message and then hangs. I can go into recovery mode, and choose "Start networking" and then go to a root prompt, and that works fine. Ping works. /etc/network/interfaces contains just the two lines "auto lo" and "iface lo inet loopback". I've double-checked that my network is working, the cable is working (it works on another PC) and the network card seems to indicate a connection. Any suggestions on how to get my PC booted again? Right now I'm limited to a root shell prompt.

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  • logging with Openbox / Gnome shows empty Desktop

    - by Sandking
    I installed new 12.04 and Openbox. I logged in with GNOME/Openbox and now after system starts I see only Desktop background image and nothing more. When I right click I can do normal GNOME actions like create folder and nothing more really. alt+f2 doesn't start run window though I managed to create a folder and then with Nautilus start terminal but I really don't know what to do next. Two questions: Why doesn't Openbox start properly? How in this situation I can get back to GDM login screen and choose other option to log in?

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  • ubuntu 12.04 sound not working in applications

    - by user109887
    I run Ubuntu on a DELL Vostro 3500 laptop. Everything was working perfectly since this morning, after an update... I can't play any multimedia sound anymore, that includes youtube and others, mp3 in Rythmbox, sound of video in VLC. I can see my device in the setting window and I can play tests sound, but nothing else. Any idea? EDIT: I'm switching very often from to HDMI output, which is deconnected right now. I've tried running VLC, and in the audio menu, you can choose the output so now I can listen to music via VLC but not with other programs. Looks like ubuntu is not totally switching the audio device after unplugging the HDMI cable. Is there any command line which can do so?

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  • Part 4 of 4 : Tips/Tricks for Silverlight Developers.

    - by mbcrump
    Part 1 | Part 2 | Part 3 | Part 4 I wanted to create a series of blog post that gets right to the point and is aimed specifically at Silverlight Developers. The most important things I want this series to answer is : What is it?  Why do I care? How do I do it? I hope that you enjoy this series. Let’s get started: Tip/Trick #16) What is it? Find out version information about Silverlight and which WebKit it is using by going to http://issilverlightinstalled.com/scriptverify/. Why do I care? I’ve had those users that its just easier to give them a site and say copy/paste the line that says User Agent in order to troubleshoot a Silverlight problem. I’ve also been debugging my own Silverlight applications and needed an easy way to determine if the plugin is disabled or not. How do I do it: Simply navigate to http://issilverlightinstalled.com/scriptverify/ and hit the Verify button. An example screenshot is located below: Results from Chrome 7 Results from Internet Explorer 8 (With Silverlight Disabled) Tip/Trick #17) What is it? Use Lambdas whenever you can. Why do I care?  It is my personal opinion that code is easier to read using Lambdas after you get past the syntax. How do I do it: For example: You may write code like the following: void MainPage_Loaded(object sender, RoutedEventArgs e) { //Check and see if we have a newer .XAP file on the server Application.Current.CheckAndDownloadUpdateAsync(); Application.Current.CheckAndDownloadUpdateCompleted += new CheckAndDownloadUpdateCompletedEventHandler(Current_CheckAndDownloadUpdateCompleted); } void Current_CheckAndDownloadUpdateCompleted(object sender, CheckAndDownloadUpdateCompletedEventArgs e) { if (e.UpdateAvailable) { MessageBox.Show( "An update has been installed. To see the updates please exit and restart the application"); } } To me this style forces me to look for the other Method to see what the code is actually doing. The style located below is much easier to read in my opinion and does the exact same thing. void MainPage_Loaded(object sender, RoutedEventArgs e) { //Check and see if we have a newer .XAP file on the server Application.Current.CheckAndDownloadUpdateAsync(); Application.Current.CheckAndDownloadUpdateCompleted += (s, e) => { if (e.UpdateAvailable) { MessageBox.Show( "An update has been installed. To see the updates please exit and restart the application"); } }; } Tip/Trick #18) What is it? Prevent development Web Service references from breaking when Visual Studio auto generates a new port number. Why do I care?  We have all been there, we are developing a Silverlight Application and all of a sudden our development web services break. We check and find out that the local port number that Visual Studio assigned has changed and now we need up to update all of our service references. We need a way to stop this. How do I do it: This can actually be prevented with just a few mouse click. Right click on your web solution and goto properties. Click the tab that says, Web. You just need to click the radio button and specify a port number. Now you won’t be bothered with that anymore. Tip/Trick #19) What is it? You can disable the Close Button a ChildWindow. Why do I care?  I wouldn’t blog about it if I hadn’t seen it. Devs trying to override keystrokes to prevent users from closing a Child Window. How do I do it: A property exist on the ChildWindow called “HasCloseButton”, you simply change that to false and your close button is gone. You can delete the “Cancel” button and add some logic to the OK button if you want the user to respond before proceeding. Tip/Trick #20) What is it? Cleanup your XAML. Why do I care?  By removing unneeded namespaces, not naming all of your controls and getting rid of designer markup you can improve code quality and readability. How do I do it: (This is a 3 in one tip) Remove unused Designer markup: 1) Have you ever wondered what the following code snippet does? xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480" This code is telling the designer to do something special with this page in “Design mode” Specifically the width and the height of the page. When its running in the browser it will not use this information and it is actually ignored by the XAML parser. In other words, if you don’t need it then delete it. 2) If you are not using a namespace then remove it. In the code sample below, I am using Resharper which will tell me the ones that I’m not using by the grayed out line below. If you don’t have resharper you can look in your XAML and manually remove the unneeded namespaces. 3) Don’t name an control unless you actually need to refer to it in procedural code. If you name a control you will take a slight performance hit that is totally unnecessary if its not being called. <TextBlock Height="23" Text="TextBlock" />   That is the end of the series. I hope that you enjoyed it and please check out Part 1 | Part 2 | Part 3 if your hungry for more.  Subscribe to my feed CodeProject

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  • wireless not working, but wired does

    - by user211762
    First of all I'm new to Ubuntu, just bought a laptop with Ubuntu yesterday. I disable wireless networking in the upper right corner, and I don't have option to enable it back. I tried a lot of things and none is seems to work: I installed Wicd network manger, and it says no wireless network found, but i assure you there are several of them as my smart tv can detect them. when I type rfkill list, I get this: 0: dell-wifi: Wireless LAN Soft blocked: no Hard blocked: no when I type ifconfig wlan0, I get this: wlan0: error fetching interface information: Device not found

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  • ubuntu 12.04 html5 video jumps out of fullscreen when I change volume [closed]

    - by user68477
    Often I can't play html5 videos at all until after a relogin. I have a lenovo t500 with an ati hd3650. My sense is that it's the pop up notice that kills fullscreen. The "popup" notice refers to the notice that always pops up in the upper right hand corner when ubuntu announces something. In this case it pops up when I change the volume and video immediately jumps out of fullscreen. The question is: can I do something about the lack of fullscreen in youtube html5 or is it something I just have to accept?

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  • Browser game in JSP? [closed]

    - by Constant
    I want to develop a browser-game (like ogame, travian) and I have some doubts in which technologies should I use. I was thinking in a server-side in JSP,Java and a client-side in HTML (or HTML5 if I learn to give it good use). Do you think my choices are right? I would like to make a board where many players could move simultaneously between tiles or squares. Do you think is possible in JSP or I should start with other language? Any suggestion aprecciated, and apologies for my english. Thank you! Regards!

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