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  • Is there a better strategy than relying on the compiler to catch errors?

    - by koan
    I've been programming in C and C++ for some time, although I would say I'm far from being an expert. For some time, I've been using various strategies to develop my code such as unit tests, test driven design, code reviews and so on. When I wrote my first programs in BASIC, I typed in long blocks before finding they would not run and they were a nightmare to debug. So I learned to write a small bit and then test it. These days, I often find myself repeatedly writing a small bit of code then using the compiler to find all the mistakes. That's OK if it picks up a typo but when you start adjusting the parameters types etc just to make it compile you can screw up the design. It also seems that the compiler is creeping into the design process when it should only be used for checking syntax. There's a danger here of over reliance on the compiler to make my programs better. Are there better strategies than this? I vaguely remember some time ago an article on a company developing a type of C compiler where an extra header file also specified the prototypes. The idea was that inconsistencies in the API definition would be easier to catch if you had to define it twice in different ways.

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  • Gone in 60 Seconds: An Insecure Database is an Easy Target

    - by Troy Kitch
    According to the recent Verizon Data Breach Investigations Report, 98% of breached data originates from database servers and nearly half are compromised in less than a minute! Almost all victims are not even aware of a breach until a third party notifies them and nearly all breaches could have been avoided through the use of basic controls. Join us for this November 28th webcast to learn more about the evolving threats to databases that have resulted in over 1 billion stolen records. Also, hear how organizations can mitigate risks by adopting a defense-in-depth strategy that focuses on basic controls to secure data at the source - the database. There's no turning back the clock on stolen data, but you can put in place controls to ensure your organization won't be the next headline. Note, this webcast will be recorded for on-demand access after November 28th. 

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  • Help with Meshes, and Shading

    - by Brian Diehr
    In a game I'm making in LibGdx, I wish to incorporate a ripple effect. I'm confused as to how I get access to the individual pixels on the screen, or any way to influence them (apart from what I can do with sprite batch). I have my suspicions that I have to do it through openGL, and it has something to do with apply a mesh? This brings me to my question, what exactly is a mesh? I've been working on my game for about half a year, and am doing great with the other aspects of the game, but I find this more advance stuff isn't as well documented. Thanks!

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  • opengl memory issue - quite strange.

    - by user4707
    Hello, I have heard that textures consumes lot of memory but I am surprised how much.... I have 7 textures 1024 16 bit each. And while I will run my app it consumes 57MB of memory. I think that this is "a bit" too much. I am writing 2D application (no cocos or other framework) Strange is that while I will compile my app with disabled rendering methods: glDrawArrays than It uses only 27MB.... which is about 30MB less... Do you have any Idea why? I am creating textures before rendering of course: rendering looks like this: [EAGLContext setCurrentContext:context]; glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer); glClearColor(0.0f, 0.0f, 0.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); glPushMatrix(); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_TEXTURE_2D); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); TeksturaObrazek *obrazek_klaw =[[AppDirector sharedAppDirector] obrazek_klaw]; glBindTexture(GL_TEXTURE_2D, [[obrazek_klaw image_texture] name] ); glVertexPointer(2, GL_FLOAT, 0,vertex1); glTexCoordPointer(2, GL_FLOAT, 0, vertex2); glColor4f(1,1,1,alpha); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); glDisable(GL_BLEND); glDisable(GL_TEXTURE_2D); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glPopMatrix(); [context presentRenderbuffer:GL_RENDERBUFFER_OES]; It looks like standard routine... I have spent about 2 days looking for for answer and I still have no clue.

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  • Handling commands or events that wait for an action to be completed afterwards

    - by virulent
    Say you have two events: Action1 and Action2. When you receive Action1, you want to store some arbitrary data to be used the next time Action2 rolls around. Optimally, Action1 is normally a command however it can also be other events. The idea is still the same. The current way I am implementing this is by storing state and then simply checking when Action2 is called if that specific state is there. This is obviously a bit messy and leads to a lot of redundant code. Here is an example of how I am doing that, in pseudocode form (and broken down quite a bit, obviously): void onAction1(event) { Player = event.getPlayer() Player.addState("my_action_to_do") } void onAction2(event) { Player = event.getPlayer() if not Player.hasState("my_action_to_do") { return } // Do something } When doing this for a lot of other actions it gets somewhat ugly and I wanted to know if there is something I can do to improve upon it. I was thinking of something like this, which wouldn't require passing data around, but is this also not the right direction? void onAction1(event) { Player = event.getPlayer() Player.onAction2(new Runnable() { public void run() { // Do something } }) } If one wanted to take it even further, could you not simply do this? void onPlayerEnter(event) { // When they join the server Player = event.getPlayer() Player.onAction1(new Runnable() { public void run() { // Now wait for action 2 Player.onAction2(new Runnable() { // Do something }) } }, true) // TRUE would be to repeat the event, // not remove it after it is called. } Any input would be wonderful.

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  • ALSA Mutes Incorrect Audio Device on Headphone Event

    - by Gardiner
    I know what the problem is, I just don't know how to prevent it. When I plug in my headphones, ALSA automatically mutes (and sets the volume to 0) the 'Speaker' entry in alsamixer. If I go in and manually unmute (and turn the volume up) I have sound from my headphones. Question is, how do I change this behavior? I want it to adjust the volume to half, but not mute or set the volume to 0. I'm using Ubuntu Gnome 13.04 Output of amixer scontents Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] This answer solved my issue: How can I get sound on headphones without switching back to 'Speakers' manually?

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  • Learn as much as possible about the setup behind a website.

    - by carrier
    Let's say I'm in the process of planning the setup of a website. I study similar sites that offer similar services or might receive similar traffic model. Is there a way to determine a bit the kind of setup, software and/or hardware. Some things are obvious. If I see .php or .jsp then I already know a bit. But any ideas on how to decipher more? Maybe where the site is hosted, hardware, platforms...

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  • Chrome window freezes in Ubuntu

    - by Dragon5689
    Sometimes, especially when I open pages that have some kind of multimedia contents, Chrome freezes. It always happens directly after opening a new tab. In contrast to the way Chrome usually has only tabs crashing, the entire windows freezes. If I have multiple separate Chrome windows open, the others keep working. I run Ubuntu 12.04 and Chrome in version 20.0.1132.47 but this has been going on since I last set up my machine around half a year ago. Anyone having the same problems or an idea what could be wrong here?

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  • 12.04 - sound is laggy when running games through Wine

    - by orzechowskid
    Lenovo U400 Wine 1.5.5 Ubuntu 12.04 with all updates applied I'm experiencing severe (~500ms) audio lag in all games run in Wine. Portal 2, Half-Life, World of Goo, and Fallout are all exhibiting this problem. When I run winecfg though and click the "Test Sound" button at the bottom of the Audio tab, the sound effect appears to play immediately. So I'm not sure what's going on. I don't think it's a problem with PulseAudio by itself since totem videos and Youtube clips both play in perfect sync. Anyone have any ideas on where to start fixing this? thanks! (edit: I thought this was limited to Steam games but I installed a non-Steam game and I now see that's not the case. I get audio lag in other apps too.)

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  • Moving Day

    - by Christopher House
    I've decided that it's time for me to move on from Geeks with Blogs.  It's been a great platform but unforuntately I've not used it nearly as much as I should.  It's been over a year and a half since my last post.  It's not that I haven't had worthwhile stuff to post, it's more due to a lack of motivation.  Knowing how I work, I think part of the problem with me using GWB is that it's free.  If I don't use it, I don't feel like I'm wasting anything.  With that in mind, I've decided to move to a paid host in hopes that drives me to post more frequently.  My new blog is located at the following address:http://thirteendaysaweek.comIn the coming days and weeks I'll be working on moving my content to the new site and will leave posts here that redirect to the new site.

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  • Ubuntu 12.04 cannot start

    - by user57215
    I just installed Ubuntu 12.04 64bit, and I cannot start it. I tried twice. The first time, I used a CD I burned. (The CD works for my another computer, so it is OK.) After wubi did something in Windows, it rebooted. Then the screen was stuck where there is an ubuntu logo at the center and 5 dots below. I waited for more than half hour, it was still there and nothing happened. The second time, I installed 11.10, then upgrade to 12.04 in a the newly install 11.10. BTW, the 11.10 did start. After upgrading, I rebooted the computer, it was stuck at the same place. Any one can help me on this? The computer is AMD Phenom II X4 965 + ATI RADEON HD4870. Thanks a lot!

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  • Photo sharing social platform [closed]

    - by user1696497
    I am working on a photo sharing social platform like Flickr, Photobucket. To start off with I have half a million photos as of now. I want to convert all of these into a single format, compression ratio and use it as an original image. I will be storing original image, re-sized image according to layout and a thumbnail. I have started off with ruby, didn't find supporting libraries. I am considering python as it has a good image processing library and instagram is using it. I want some advise about how the image has to be processed while uploading, efficient way of storage whether database or a file system, image compressions, and precautions to be taken. I would be having profile pictures, do I need store them separately or along with the images? If I want to store the images on a file system, which file system should I use and also should I store the url or should I use any intermediate key value store like redis?

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  • How can I get nVidia CUDA or OpenCL working on a laptop with nVidia discrete card/Intel Integrated Graphics?

    - by PeterDC
    Background: I'm a 3D artist (as a hobby) and have recently started using Ubuntu 12.04 LTS as a dual-boot with Windows 7. It's running on my a fairly new 64-bit Toshiba laptop with an nVidia GeForce GT 540M GPU (graphics card). It also, however has Intel Integrated Graphics (which I suspect Ubuntu's been using). So, when I render my 3D scenes to images on Windows, I am able to choose between using my CPU or my nVidia GPU (faster). From the 3D application, I can set the GPU to use either CUDA or OpenCL. In Ubuntu, there's no GPU option. After doing (too much?) research on the issues with Linux and the nVidia Optimus technology, I am slightly more enlightened, but a lot more confused. I don't care one bit about the Optimus technology, as battery life is not by any means an issue for me. Here's my question: What can I do to be able to use CUDA-utilizing programs (such as Blender) on my nVidia GPU in Ubuntu? Will I need nVidia drivers? (I have heard they don't play nicely with Optimus setups on Linux.) Is there at least a way to use OpenCL on my GPU in Ubuntu?

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  • Ubuntu audio mysteriously stopped working (12.04)

    - by Laika
    Well, I've been a user of Ubuntu 12.04 LTS since April now, and it's been a very pleasant experience. I'm a big fan of electronic music, and I tend to have my tracks playing in the background while I do things on my laptop, either in YouTube or in Clementine, my default music player. All has worked very well until now. A couple of days ago my entire PC started to lag really badly. Almost everything was unusable. I opened up System Monitor via the terminal to find a process called "pulseaudio" using nearly 1GB of RAM and over 80% of my CPU. I needed to get some important work done and so I killed the process without thinking. Once again today, pulseaudio decided to lag the hell out of my PC, and so I killed it again. Nothing seemed to happen immediately, but once I opened up YouTube all the audio on videos stuttered a lot, while the videos played smoothly. I restarted Firefox to find that the audio was now not working at all, with both headphones and speakers, and the volume up quite a bit (it's not muted, I've checked that!). A little bit of research later and I've discovered that pulseaudio plays an important part in Ubuntu's audio. Even after restarting my PC the audio still ceases to work in any applications or with any output. The pulseaudio process refuses to start up again. So, can you help me out here? What can I do to fix my problem, and why was pulseaudio doing this in the first place?

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  • Jumping around to work on different features when you get stuck, is it a source of project failures?

    - by codecompleting
    On personal projects (or work), if one gets stuck on a problem, or waiting to figure out a solution to the problem, if you jump to another section of your code, don't you think it will be a good reason your application will be buggy or worse yet never get completed? Assuming you are not using git and code each feature to a specific branch, things can get out of hand since you have 3 different features you are working on, and you have unresolved issues in each. So when you get done to work, you get stressed out because you have these hanging issues and half-baked code lingering about. What's the best way to avoid this problem? (if you have it) I'm guessing using something like git and creating a branch per feature is the safest way to avoid this bad habit. Any other suggestions?

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  • Do any database "styles" use discrete files for their tables?

    - by Brad
    I've been talking to some people at work who believe some versions of a database store their data in discrete tables. That is to say you might open up a folder and see one file for each table in the database then several other supporting files. They do not have a lot of experience with databases but I have only been working with them for a little over a half year so I am not a canonical source of info either. I've been touting the benefits of SQL Server over Access (and before this, Access over Excel. Great strides have been made :) ). But, other people were of the impression that the/one of the the benefit(s) of using SQL Server over Access was that all the data was not consolidated down into one file. Yet, SQL Server packs everything into a single .mdf file (plus the log file). My question is, is there an RDBMS which holds it's data in multiple discrete files instead of one master file? And if the answer is yes, why do it one way over the other?

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  • Split Texture2D Across Line

    - by Simie
    Background I'm using a texture as a damage map represented by an array of floats for displaying damage effects on a space ship in a process. An upside of this is being able to 'slice' ships in half, using an input damage map with a line down the middle, as shown in the diagram below. Question However, I'm encountering problems separating this split ship into two different entities. I would like to be able to split the image down the 'damage line', in a process similar to this: I don't have much idea where to start detecting the red line above. Any advice would be welcome.

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  • Teaming/Spanning Switch Ports

    - by KTech
    I like to team NICs on my servers. Since most workstations are giga-bit anymore I want to provide my servers a bit more bandwidth. I've read various things that say I am/am not supposed to bond the ports on the switch. I see benefit in doing it as I'm not sure how the switch ARP table handles the same MAC address on multiple ports. Suggestions on the "ideal" way to do it? If it matters, I have mix (various locations) of Dell and HP, web managed, Layer 2 switches. Servers are mostly Dell with Broadcom NICs.

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  • Usefull skills from a computer science degree

    - by Tom Squires
    I did my degree in physics and moved later into programming. I have two and a half years experience under my belt and like to think I write good code. I am, however, concerned that not doing a compsci degree has left holes in my knowledge. I would like to fill those up now since I know I want to be doing programming for the rest of my career. What skills/techniques did you learn in your compsci degree that one wouldn't pick up from on-the-job programming?

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  • Economical way to get many harddrives into rack mount?

    - by Industrial
    Hi everyone, Please bear with me as being a bit of a newcomer at 19" rack-mounted equipment. I've thought a fair bit lately about the best way of getting 4x or 6x of 2.5" hard drives into my rack and are right now currently slightly confused about would be the best (economical) solution. After scouting the market, I've found this type of disk array units that offers built in RAID and a lot of drive slots and a truckload of geek cred, but at a price that just isn't going to fit in my budget. I've also found these type of cute adapters that takes two 2.5" drives in one 3.5" slot, but I will obviously need a chassie with a lot of 3.5" spaces in order to make it work. So what is the most economical way to house my harddrives in my rack?

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  • INstlling ubuntu

    - by Erich
    Am trying to install ubuntu 12.04 on a pentium 4 with a hard disk that's been totally wiped clean. Have made an iso image, burned it on a cd and it has been verified. Checked to see if separate files have been burned on cd and they have. When I boot to the disk I get the word unbuntu with some progress dots, 5 min later it goes to a red screen with the mouse arrow on screen. It has stayed in this condition for over half an hour now. Help? erich

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  • Seeking easy to use Setup creator with logic and ability to write registry keys

    - by Mawg
    I want to create a Setup to install my application. It as to be able to do the following: ask a question (maybe 2 radio buttons?) and, depending on the reply, copy one of 2 DLLs to the Windows directory and invoke regsvr to register the DLL write some registry keys I would code my own program to do this, but I don't have enough knowledge of the different versions of Windows (XP, Vista, 7, etc) and 32/64 bit, registry layout, or permissions like UAC, etc So, it seems to me that it would be easier to use a Setup generator which has been around for a while and already handles all of this stuff. I went to my favorite site for free stuff and found this page. However, the programs mentioned there are either too simplistic or have too steep a learning curve for me. Can anyone recommend a Goldilocks solution which does what I mentioned in those two bullet points while taking into account all Windows versions, 32/64 bit, non-admin accounts, etc?

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  • usb stop working

    - by miguel
    I'm using Xubuntu 12.04 on a 64 bit Intel core duo laptop and the 3 USB 3.0 ports stopped working if I do not use the mouse. I updated the kernel to 3.9 but the bug persists. I googled too much and the few reponses I got cannot fixed this. The only solution is shuting down, unplugging and then plugging them back, then all works fine. But after half an hour or two days the bug reappears. How can I solve this? Thanks and excuse my poor english.

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  • ubuntu 13.10 liveboot/installer loads dots, then does nothing

    - by user200245
    Problem: When I load an Ubuntu 13.10 (64-bit) live USB / installer on my laptop, the purple Ubuntu screen with the white dots appears, the dots turn orange (indicating its loading), then after a few seconds the screen turns completely black and nothing else happens. I can not install Ubuntu 13.10 on this computer. What I've Tried: I've re-downloaded the .iso file from canonical. I've burned the .iso to the USB using the default linux usb image writer, and the Windows programs YUMI and Linux Live USB Creator; same thing happens each time. Yes, I'm sure my computer is 64 bit. I'm currently running Linux Mint 15 on it, which runs perfectly. It's a Sager NP7330 / Clevo w230st. extra info A few months I installed Ubuntu 13.04 on this machine, which installed perfectly. Normally I'd install that then dist-upgrade to 13.10, HOWEVER this computer is only a few months old and the wireless/network drivers for my network card were not implemented until kernel 3.11 (which comes w ith 13.10). I tried manually downloading kernel 3.11 and installing it (on 13.04), however the wireless card nor ethernet card still did work with Ubuntu 13.04. So my only real hope is to get 13.10 working. Does anyone know what's up with this?

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  • How to join a Windows Domain an Map NEtwork Drives on Ubuntu Partition

    - by AgainstClint
    I just installed the current build for Ubuntu on a partition for my work computer. I am a novice when it comes to Linux/Ubuntu, which is why I installed it along side windows. I want to learn how to operate and use Ubuntu much more than I do now, so I figured installing it and trying to do day to day functions here would be a "Thrown into the pool with sharks" way to do it, and I like that way. I did however have a few questions: We are on a Domain in Windows, is there any way to join that domain using the Ubuntu partition? We Also have 16 mapped network drives. I don't actually need ALL of them mapped for Ubuntu, but is there a way to Map at least one of them to see/use here in Ubuntu. Outlook Corporate email, how can I sign in/use it while...well, you get the idea. As I said earlier, I am VERY new to Ubuntu, i've only played around with it a bit at home and never at the office. If you could simplify it down for me a bit, that would be great.

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