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• Is there any simple C++ code to grab video from UVC webcam and display it simultaneously?

  - by mShero

  I'm very very new to Linux and programming! I'm using ubuntu 11.10 - 64 bits with gcc 4.6.1 I've been searching online for an example C++ code that simply grabs video from a compliant UVC webcam and displays it simultaneously.. I need to compile it on gcc. In OpenCV, it's a very simple code less than 20 lines as I remember! I found this: http://v4l2spec.bytesex.org/spec/capture-example.html But it's very huge code relative to OpenCV code ?! and even when I tried to compile it using gcc.. I got many errors! I copied the code into a cpp file: cap.cpp then wrote in the terminal: gcc cap.cpp -o cap and the errors showed up... same errors with g++ I hope if someone can help me and tell me where can I find another simpler code? and how can I test it ? Thank you :)

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• Can I safely remove pre-installed software in Ubuntu 13.10?

  - by Andzt

  I uses a lots of Google Apps Product in my Laptop, Tablet and Mobile. Since I never use all pre-installed software in Ubuntu, can I remove it? E.g like: LibreOffice | I use Google Doc etc. RhythmBox | I use Google Play Music Thunderbird | I use Gmail, don't like client Videos | Watch online Messaging | Hangouts And other softwares like Remmina Client, BitTorrent Client. Can I simply remove it in Ubuntu Software Centre? I like my Laptop clean and having unmessy software that I never use. I normally use Chromium Browser to do all the stuff, I think I am heavy user of Google, and love the simplicity of Ubuntu. Lol! Can anyone tell or guide me? Thanks!

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• Intuitive "Take Screenshot" key mapping used by games?

  - by Hatoru Hansou

  I recently had a problem testing my game on Linux Ubuntu. The Print key is intercepted by the desktop environment and It never reaches the game. Rather than fighting this, I will simply use any other key or key combination to trigger the screen capture functionality. Now, using the PRINT key is very intuitive because people already expect this behavior. What other keys are a good idea to use to take screenshots? And if possible elaborate why, have other apps/games used that key?

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• In 12.04, with my Linksys WUSB54G USB adapter I can see the networks, but cannot connect to any of them

  - by tobye

  I recently loaded Ubuntu version 12.04 onto my computer, and I have a WUSB54G v4 USB wireless adapter. I first tried to get it to work by simply plugging my adapter into an open USB port. This seemed to work fine, it came up with a list of wireless adapters, so I clicked on the correct one and entered the security code. It looked like it was going to connect. It tried for about five minutes before I stopped it. I then decided to create a network as I also have one setup. I did this and it connected, only one problem, I couldn't get onto the internet. Please help me, I am new to Ubuntu and am totally lost.

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• How can I restore /usr/share/fonts on 10.04?

  - by user207046

  I did something extremely stupid. I'm currently working on a 10.04 system (work-related), and since I was missing some fonts I decided to simply copy some over from my own, 12.10 system. I ran cp -R <12.10 root/usr/share/fonts/truetype/* /usr/share/fonts/truetype/ Immediately, terminal and window header fonts got completely messed up, although chromium still shows everything correctly, as does nautilus. How can I restore this directory? Is there anything else I have do afterwards? Thanks a bunch, Chris For shits and giggles, here's how it looks.

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• Distinguishing between sets of status reports

  - by user1769486

  I am working on an internal database monitoring system and am at a point where I sort of hit the wall in terms of application design. Basically I have an extensible plugin architecture where I shall have an OK, a warning or an error upon running a db verification. My first question whether it is sufficient to have only one status reported with an optional status message or provide the ability to have more than one returned (with attached messages) and then calculate an aggregated overall status. In particular in the latter case my second issue would be how to distinguish between two verification reports with the same status code (as it can come from different triggers). I would need to do this to see whether some change happened between the current and last verification. I could simply have string comparisons of the attached status messages mentioned above but that does not seem very reliable.

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• Send some form info to a PHP page to be processed without going to that page? [closed]

  - by zuko

  Okay, so I'm not very familiar with php. I have a very simple form, just 2 text fields. All I want to do is, after validating with JavaScript, send these two string fields in an email to a pre-defined email address. I understand how JavaScript works on the client side; you can respond to user events, etc. And PHP is server-side. What I'm having trouble grasping and figuring out is how do I run PHP functions, etc when I want? I figured out how to use the 'action' attribute of the form to send the data via POST to another PHP page. But this simply opens that page. I don't want to open the page I just want to do some processing and send a message back to the page the user is still on. How do I go about something like that? Thanks.

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• How to Create a Powerful Website That Sells Today?

  If you are trying to make money online, you simply must have a well designed website. When it comes to designing their websites, many internet marketers think very short term and do a low quality rush job. Putting up a cheap or cookie cutter type website will not bring you the online success that you desire. Whatever time it takes to make an attractive website that is appealing to visitors should be considered a necessary investment in your future success. Some people think it's very hard or that you have to be some kind of technical genius to make a good website; thankfully, this isn't the case.

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• Simulating a sine wave/oscillating pattern for enemies

  - by Sun

  I'm creating a simple top down shooter, right now I have an enemy which simply follows the player. I'd like to change things up and have the enemies move towards the player but in a wave like motion. I have looked at some similar questions like this but they don't take into account for the Y changing. How can I simulate a wave like pattern for my enemies whilst they are homing into their target. Edit: Sample code In my update method I have the following: Vector2 trackingPos = position - target; trackingPos.Normalize(); position -= trackingPos * elaspedTime * speed;

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• Is this a reliable method of parsing glGetShaderInfoLog()?

  - by m4ttbush

  I want to get a list of errors and their line numbers so I can display the error information differently from how it's formatted in the error string and also to show the line in the output. It looks easy enough to just parse the result of glGetShaderInfoLog(), look for ERROR:, then read the next number up to :, and then the next, and finally the error description up to the next newline. However, the OpenGL docs say: Application developers should not expect different OpenGL implementations to produce identical information logs. This makes me worry that my code may behave incorrectly on different systems. I don't need them to be identical, I just need them to follow the same format. So is there a better way to get a list of errors with the line number separate, is it safe to assume that they'll always follow the "ERROR: 0:123:" format, or is there simply no reliable way to do this?

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• My computter wont shutdown

  - by marijn

  If I try to shutdown my computer it simply takes me back to the login-screen. I looked around and found : Type in terminal: 1. sudo gedit /etc/default/grub 2. Find the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" 3. Change this to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force" 4. Save the file and close the file. 5. Finally, in terminal: sudo update-grub but now there is a new problem. if I try step 5 it says: myname@ubuntu:~$ sudo update-grub [sudo] password for myname: /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?). myname@ubuntu:~$ I am new whit linux and dont know what to do.

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• Driver inversion

  - by Val

  I have a GUI game, which is driven by user every time it clicks the mouse. Every time user clicks a square on a board, the board state is updated (we re-compute the score, the player to make next move and legal movements it can make) and repainted. Both mouse click, state recomputation and painting are handled in the GUI thread. Now, suppose that I want to train AI to play without GUI. That is, game engine should consume next move by simply calling AI's makeMove function in one thread. This would allow to play millions of games per second automatically. GUI may just screenshot some arbitrary states time after time. How do you switch to this strategy?

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• better site analytics service / script: real time statistics and time spent on pages?

  - by toPeerOrNotToPeer

  I'm looking for a site analytics software (service or script) that must be easy to comprehend. GA is simply too much complicated and it misses some key features (for me). Missing features are: real time statistics (very important) time spent on page (very important) about the "time spent on page"... i do really need a statistics software that does not calculate the time between two page views. this is not useful at all in my case. because i mostly do 1 pageview = 1 user but something that logs, for example, every 10 seconds spent on a page thank you in advance

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• How come many of the AppShowdown apps aren't available in Ubuntu anymore?

  - by kermit666

  After upgrading to 12.10 I've noticed that I can't install some of the nice apps created for the AppShowdown, such as: Cuttlefish Blubphone (Lightread also came out quite late in 12.10) It seems such a waste having these great new apps added to the repository, only to exclude them in the first next version. I'm wondering why aren't these apps automatically available in a newer version of Ubuntu. Is it simply that the API is so different that it requires major rewrites and programmer activity or is it some bureaucratic reason? Are there any plans to improve this process?

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• Advise how to write a simple test for this javascript snippet?

  - by resting

  I'm trying to start unit testing (not using any testing frameworks) for my javascripts. Here's one example of it. var obj = {}; obj.disableBtn = function ($btn, style) { $btn.attr('disabled','disabled').addClass('disabled').removeClass(style); }; The use case is as such: obj.disableBtn($('.submit'), 'btn-blue'); What it does is simply add the disabled attribute, add the disabled class, and remove the btn-blue style. Please advise how would a typical test case look like in this case. I have a little knowledge on testing using assert(), but have no idea how to go about it when it involves verifying the result on HTML elements.

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• How to create a manager class without global variables nor singletons?

  - by Omega

  I would like to implement some kind of manager class in my application. It will be in charge of loading textures, processing them, distributing them etc... At first, I wanted to make a global variable that simply contains an instance of my manager class. I found this question: http://stackoverflow.com/questions/4646577/global-variables-in-java. However, the users there seem to recommend to never use global variables. Fine then, I once heard about Singletons, so I though I could use that instead. I mean, creating just one instance of my manager class sounds good. However, I found this other question: When is Singleton appropriate?, which basically tells me that Singletons are, in most scenarios, some kind of anti-pattern. Now I am a bit lost - what other approach can I take to create my manager class, whose only requirement is to be accessible from anywhere?

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• permanently disable bluetooth

  - by NotABluetoothUser

  I simply don't use bluetooth. Since it can be a security risk and also drains the battery I would like to keep it deactivated. I quickly found the option to turn it off in the settings menu, but the problem is: it doesn't stay dead! Everytime I pull my Nexus 4 out of standby mode bluetooth reappears in the top bar as if I never deactivated it. How can I deactivate it so it stays deactivated or better yet how can I remove it from my phone entirely? I tried sudo apt-get remove bluez bluetooth, but I am not allowed to edit this package.

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• How would I go about updating my electronic circuit simulator's 'electricity'?

  - by liqwidice

  I have made an application which allows the user to place down wires, power sources, and inverters on a virtual circuit board. All connections between tiles are automatic, as shown here: As you can see in the last image, the updating of power throughout this grid is not yet functioning. I think I understand how to do this updating conceptually, but getting it to work in my program is appearing to be much more difficult than I first imagined. My source code can be found here. If you have any tips as to how to I might approach this monstrous task, please let me know. EDIT The goal here is to simply get a working application. Getting tiles to pass on power to their neighbors is quite easy, but the tricky part is getting wires to "unpower" after the removal of a power source. The size of the grid is just 18x18, so efficiency really isn't a factor, for those wondering.

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• Putting the Con (COM1, LPT1, NUL, etc.) Back in your URLs

  One annoyance that some developers have run into with ASP.NET MVC is that certain reserved filenames are not allowed in URLs. The specifics of this restriction are accounted for in an interesting blog post entitled Zombie Operating Systems and ASP.NET MVC. This actually wasnt a restriction on ASP.NET MVC but was built into the core of ASP.NET itself. Fortunately, ASP.NET 4 fixes this issue with a new setting. In web.config, simply add <httpRuntime relaxedUrlToFileSystemMapping="true"/> to...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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• WPF Binding to change fill color of ellipse

  - by user294382

  Probably a simple question but: How do I programmatically change the color of an ellipse that is defined in XAML based on a variable? Everything I've read on binding is based on collections and lists -can't I set it simply (and literally) based on the value of a string variable? string color = "red" color = "#FF0000"

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• Android : Cannot cast from View to Button

  - by Mick

  I just started working with the Android, but seem to have come across a problem that I simply can't find the answer to. I get the error "Cannot cast from View to Button" on this line : Button myButton = (Button)findViewById(R.id.my_button); I've tried many different things to get it going, and I've searched for the answer, but for some reason it just refuses to work right. If anybody could point me in the right direction it'd be most appreciated. Thank you in advance.

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• GlassFish v3 Domain Server cannot start. Port is occupied.

  - by Kirby

  I imagine this is a pretty generic error. I cant seem to find any documentation on it. I am simply attempting to run a java web project with jsp's and beans... using netbeans 6.8 on windows xp. Thoughts? apologies for such a newb question. -Kirb

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• Windows Phone 7 emulator on a VM?

  - by Eduardo Scoz

  It seems that the Windows Phone 7 SDK doesn't support running inside a VM. On Parallels, the entire VM simply crashes when the emulator is starting up. Around the web, though, a few people have reported that they were able to use it by changing a lot of the VM settings. What do I have to change to be able to run it? I'm specially interested in Parallels, but VMWare or any other simulator that run on OSX if fine for me!

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• C# XmlDocument.CreateDocumentType

  - by Thorbjørn Reimann-Andersen

  hi all, I am trying to figure out of the CreateDocumentType() works in C# and although i have already found and read the msdn page on it, i can not get it to work for me. I am simply trying to create this line in my xml document: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> Can someone help me out with the syntax required for this

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• iTextSharp is missing HeaderFooter class

  - by Jon

  This is weird, I am currently using iTextSharp and I want to add a Header & Footer to my PDFs. In all the examples they simply create a new HeaderFooter() object. However, I have iTextSharp libraries all imported but the HeaderFooter is not defined. I've used Reflector to see if I can find out whereabouts the class is and its missing?! Does anyone know what has happened to this class?

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