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• Almost Realtime Data and Web application

  - by Chris G.

  I have a computer that is recording 100 different data points into an OPC server. I've written a simple OPC client that can read all of this data. I have a front-end website on a different network that I would like to consume this data. I could easily set the OPC client to send the data to a SQL server and the website could read from it, but that would be a lot of writes. If I wanted the data to be updated every 10 seconds I'd be writing to the database every 10 seconds. (I could probably just serialize the 100 points to get 1 write / 10 seconds but that would also limit my ability to search the data later). This solution wouldn't scale very well. If I had 100 of these computers the situation would quickly grow out of hand. Obviously I am well out of my league here and I have no experience with working with a large amount of data like this. What are my options and what should I research?

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• Today is my first day in the land of backbone.js

  - by Andrew Siemer - www.andrewsiemer.com

  I am semi-excited to say that today is my first day into the land of backbone.js.  This will of course take me into many other new javascript-y areas.  As I have primarily been focused on building backend systems for the past many years…with no focus on client side bits…this will be all new ground for me.  Very exciting! I am sure that this endeavor will lead to writing about many new findings along the way.  Expect the subject of near future postings to not be related to MVC or server side code. I am starting this journey by reading through the online book “Backbone Fundamentals”.  http://addyosmani.com/blog/backbone-fundamentals/  Has anyone read this yet?  Any feed back on that title. I have read though Derrick Bailey’s thoughts here and here…also very good. Any suggestions on other nuggets of learning backbone?

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• "A", "an", and "the" in method and function names: What's your take?

  - by Mike Spross

  I'm sure many of us have seen method names like this at one point or another: UploadTheFileToTheServerPlease CreateATemporaryFile WriteTheRecordToTheDatabase ResetTheSystemClock That is, method names that are also grammatically-correct English sentences, and include extra words purely to make them read like prose. Personally, I'm not a huge fan of such "literal" method names, and prefer to be succint, while still being as clear as possible. To me, words like "a", "an", and "the" just look plain awkward in method names, and it makes method names needlessly long without really adding anything useful. I would prefer the following method names for the previous examples: UploadFileToServer CreateTemporaryFile WriteOutRecord ResetSystemClock In my experience, this is far more common than the other approach of writing out the lengthier names, but I have seen both styles and was curious to see what other people's thoughts were on these two approaches. So, are you in the "method names that read like prose" camp or the "method names that say what I mean but read out loud like a bad foreign-language-to-English translation" camp?

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• Which logfile(s) log(s) errors reading a cd?

  - by Robert Vila

  I introduce a CD-RW, maybe blank (I really don't know), and after a little movement inside the reader, the CD is ejected without any message at all. I would like to know what is going on and the reason why it is ejected. How can I know that in Natty. The CD reader is working OK because I can read other CD's. It only gave me problems writing from Natty, a few days ago, but with MacOS there was no problem. Thank you Edit: Maybe there is no error, but then, how can I know what is in the Cd if there is anything?

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• "Unknown Filesystem" error without CDROM

  - by Utku Tarhan

  I've got a problem with Ubuntu 12.04 LTS. At first I ran mount command on terminal. Then I restarted my computer. After that, when my computer opened there is writing this: error: unknown filesystem grub rescue I searched commands and I found ls command. I tried it and I got this: (hd0) (hd0,msdos5) (hd0,msdos1) My computer's DVD driver is broken and I tried to boot Ubuntu on USB but it doesn't worked. My computer's specs: PC Name: HP Presario F780ET Processor: AMD Turion 64 X2 Mobile Technology TL-60 Ram: 2GB Ubuntu Version: 12.04 LTS

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• How to recognize a good programmer?

  - by gius

  Our company is looking for new programmers. And here comes the problem - there are many developers who look really great at the interview, seem to know the technology you need and have a good job background, but after two moths of work, you find out that they are not able to work in a team, writing some code takes them very long time, and moreover, the result is not as good as it should be. So, do you use any formalized tests (are there any?)? How do you recognize a good programmer - and a good person? Are there any simple 'good' questions that might reveal the future problems? ...or is it just about your 'feeling' about the person (ie., mainly your experience), and trying him out? Edit: According to Manoj's answer, here is the question related to the coding task at the job interview.

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• OpenGL ES 2. How do I Create a Basic Fading Streak Effect?

  - by dugla

  For the iPad app I am writing using OpenGL ES 2 I have a single quad - shaded using GLSL - that is dragged around the screen. Very basic. This works fine. But is rather boring. I want to increase the coolness a bit in the following way: when the user drags the quad it leaves a streak behind that fades over time. Continuous dragging would be a bit like a streaking comet across the night sky. What is the simplest way to implement this? Thanks.

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• How can I convince my company to move to MVC?

  - by guanome

  I currently write web apps using asp.net web forms and getting my company to move to another technology is like [insert funny line here]. I would really like to start writing apps using MVC, but they fear any type of change. How is the best way to convince/ease them into using MVC? I guess this can go for moving to any new technology. Update Decided to go the rogue developer route and just started using it. I recreated a small app in MVC and learned the ropes that way, and moved up from there.

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• Python Multiprocessing with Queue vs ZeroMQ IPC

  - by Imraan

  I am busy writing a Python application using ZeroMQ and implementing a variation of the Majordomo pattern as described in the ZGuide. I have a broker as an intermediary between a set of workers and clients. I want to do some extensive logging for every request that comes in, but I do not want the broker to waste time doing that. The broker should pass that logging request to something else. I have thought of two ways :- Create workers that are only for logging and use the ZeroMQ IPC transport Use Multiprocessing with a Queue I am not sure which one is better or faster for that matter. The first option does allow me to use the current worker base classes that I already use for normal workers, but the second option seems quicker to implement. I would like some advice or comments on the above or possibly a different solution.

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• How to use OpenGL functions from multiples thread?

  - by Robert

  I'm writing a small game using OpenGL. I'm implementing basic networking in this game and I'm facing a problem. I have a thread in my client socket class that check for available data, when there are data I raise an event like this : immutable int len = this.m_socket.receive(data); if(len > 0) { this.m_onDataEvent(data); } Then on my game class, I have a function that handle and parse data like this : switch(msgId) { case ProtocolID.CharacterData: // Load terrain with opengl, character model.... Im not able to call opengl functions because my opengl context is created from a different thread. But I really don't know how I can solve this problem, I tried Google but it's really hard to find a solution. I'm using D programming language if it can help.

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• Adding unit tests to a legacy, plain C project

  - by Groo

  The title says it all. My company is reusing a legacy firmware project for a microcontroller device, written completely in plain C. There are parts which are obviously wrong and need changing, and coming from a C#/TDD background I don't like the idea of randomly refactoring stuff with no tests to assure us that functionality remains unchanged. Also, I've seen that hard to find bugs were introduced in many occasions through slightest changes (which is something which I believe would be fixed if regression testing was used). A lot of care needs to be taken to avoid these mistakes: it's hard to track a bunch of globals around the code. To summarize: How do you add unit tests to existing tightly coupled code before refactoring? What tools do you recommend? (less important, but still nice to know) I am not directly involved in writing this code (my responsibility is an app which will interact with the device in various ways), but it would be bad if good programming principles were left behind if there was a chance they could be used.

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• Problem with .sh file

  - by omgzor

  I don't have any experience writing .sh files. I want to run the pvm2raw utility of this app from the Volume Library. I get the following error when running build.sh in Ubuntu 10.10. build.sh is as follows: # make command set mmfile=V3Makefile set make="make -f $mmfile" set rule=$1 if ($rule == "") set rule="all" // line 16 if ($rule == "deps") then if ($HOSTTYPE == "iris4d") $make MAKEDEPEND="CC -M" OPTS="-DHAVE_CONFIG_H -DVIEWER_HAVE_DCMTK" TARGET=IRIX depend if ($HOSTTYPE == "i386") $make MAKEDEPEND="c++ -M -I/usr/X11R6/include" OPTS="-DHAVE_CONFIG_H -DVIEWER_HAVE_DCMTK" TARGET=LINUX depend What's wrong there? Edit: I followed kniwor's advice and installed csh. Now I get the following error: How can I solve this Undefined variable problem?

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• LuaJit FFI and hiding C implementation details

  - by wirrbel

  I would like to extend an application using LuaJit FFI. Having seen http://luajit.org/ext_ffi_tutorial.html this is surprisingly easy when comparing this to the Lua C API. So far so good. However I do not plainly want to wrap C functions but provide a higher level API to users writing scripts for the application. Especially I do not want users to be able to access "primitives", i.e. the ffi.* namespace. Is this possible or will that ffi namespace be available to user's Lua scripts? On the issue of Sandboxing Lua I found http://lua-users.org/wiki/SandBoxes which is not talking about FFI though. Furthermore, the plan I have described above is assuming that the introduction of abstraction layers happens on the lua side of code. Is this an advisable approach or would you rather abstract functionality on the statically compiled code (on the C-side)?

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• Raspberry Pi + Azure + Mobile App

  - by Richard Jones

  Ongoing project idea. So this is of long running personal interest to build a Mobile App that shows you a push notification/pop up alert, when anyone calls your house phone. So I've taken delivery of a Raspberry Pi. I've ordered a new Crucible Technology Caller ID Box. (arriving soon). I have been writing/learning Python to implement the Listener software. This will in turn push xml messages up to Azure for final delivery via push notifications to an App. iOS app already written to receive the notifications/allow address book additions made up from phone numbers from incoming calls. So this is fusion, R-Pi, Azure, Hardware and iOS. Details to follow as this plan unfolds.

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• Offre demploi Job Offer - Montreal

  Im currently helping a client plan its management systems re-architecture and they are looking to hire a full time .NET developer.  Its a small 70 people company located in the Old Montreal, youll be the sole dev there and youll use the latest technologies in re writing their core systems. Heres the job offer in French: Concepteur de logiciel et programmeur-analyste .NET chevronn (poste permanent temps plein) Employeur : Traductions Serge Blair inc. Ville : Montreal QC TRSB, cabinet...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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• Offre demploi Job Offer - Montreal

  Im currently helping a client plan its management systems re-architecture and they are looking to hire a full time .NET developer.  Its a small 70 people company located in the Old Montreal, youll be the sole dev there and youll use the latest technologies in re writing their core systems. Heres the job offer in French: Concepteur de logiciel et programmeur-analyste .NET chevronn (poste permanent temps plein) Employeur : Traductions Serge Blair inc. Ville : Montreal QC TRSB, cabinet...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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• Mount an external drive at boot time only if it is plugged in.

  - by Jeremy

  I've got an entry for an external harddrive in my fstab: UUID="680C0FE30C0FAAE0" /jgdata ntfs noatime,rw But sometimes this drive isn't plugged in at boot time. This leaves me half way through a boot, with a prompt to "Continue Waiting, press S or press M" but no keypress has any affect at this stage (including ctrl-alt-delete, not even caps-lock). Short of writing a script to check the output of fdisk -l, how can I mount this drive at boot time only if it is present? It would be handy to have an fdisk entry for this drive, so I can just type mount /jgdata instead of needing a device name.

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• What should I worry about when changing OpenGL origin to upper left of screen?

  - by derivative

  For self education, I'm writing a 2D platformer engine in C++ using SDL / OpenGL. I initially began with pure SDL using the tutorials on sdltutorials.com and lazyfoo.net, but I'm now rendering in an OpenGL context (specifically immediate mode but I'm learning about VAOs/VBOs) and using SDL for interface, audio, etc. SDL uses a coordinate system with the origin in the upper left of the screen and the positive y-axis pointing down. It's easy to set up my orthographic projection in OpenGL to mirror this. I know that texture coordinates are a right-hand system with values from 0 to 1 -- flipping the texture vertically before rendering (well, flip the file before loading) yields textures that render correctly... which is fine if I'm drawing the entire texture, but ultimately I'll be using tilesets and can imagine problems. What should I be concerned about in terms of rendering when I do this? If anybody has any advice or they've done this themselves and can point out future pitfalls, that would be great, but really any thoughts would be appreciated.

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• The performance implications of IEnumerable vs. IQueryable

  It all started innocently enough. I was implementing a "Older Posts/Newer Posts" feature for my new web site and was writing code like this:IEnumerable<Post> FilterByCategory(IEnumerable<Post> posts, string category) {  if( !string.IsNullOrEmpty(category) ) { return posts.Where(p => p.Category.Contains(category)); }}...  var posts = FilterByCategory(db.Posts, category);  int count = posts.Count();... The "db" was an EF object context object, but it could just as...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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• The performance implications of IEnumerable vs. IQueryable

  It all started innocently enough. I was implementing a "Older Posts/Newer Posts" feature for my new web site and was writing code like this:IEnumerable<Post> FilterByCategory(IEnumerable<Post> posts, string category) {  if( !string.IsNullOrEmpty(category) ) { return posts.Where(p => p.Category.Contains(category)); }}...  var posts = FilterByCategory(db.Posts, category);  int count = posts.Count();... The "db" was an EF object context object, but it could just as...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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• Few New Features Added to Geekswithblogs.net

  - by Staff of Geeks

  After reviewing some of the feedback from our bloggers we added a couple new features to Geekswithblogs.net and there are still more to come.  Here is a list of the features we added.   Fixed the Twitter parser to better support URLs and Hash Tags Added some hooks behind the scenes to tags posts with common keywords automatically Added Facebook likes and Tweets to the bottom of every post Cleaned up a few skins Images on the main page for bloggers who use Gravatar or Twitter integration Random bug fixes based on Log   We are definitely working to make Geekswithblogs.net faster and better.  If you have any suggestions, please feel free to share them with the team.  On a side note, if that suggestion is move to WordPress, I will reply to you with stop writing ASP.NET for your day job and move to PHP.  That request is the equivalent in my eyes.  If we have enough bloggers leave the Microsoft .NET Platform for their main source of income, we might consider it.   Technorati Tags: Geekswithblogs.net,Features,Version 4.0

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• Is there now any way to convert mp3 files to m4a or aac 192kbit?

  - by piedro

  Since about two years now I am trying to find a way to convert high quality mp3 files to m4a or aac files with a fixed bitrate 192k. Please don't suggest using another format - i thought this through as far as it goes. The problem here is: ffmpeg obvioulsy can't convert to a higher bitrate than 152k. Even when it says it does so the resulting files still have 152k instead of 192k. ffmpeg also has/had a bug not writing the bitrate into the audio file tags which means when testing you have to calculate the bitrate manually by dividing the filesize by the length of the audio in seconds (resulting in 152k - see above) choosing faac as converter gets me the same results other programs don't work reliably (see this thread Howto convert audio files to *.m4a? I know that this is not an original new problem but I am wondering if there is still no way to convert with ubuntu/kubuntu 12.04 after a lot time passed and I can't find some of the bug issues mentioned in the other thread anymore. So: Is there a solution after all?

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• Can not update Natty running from a USB stick

  - by Ingo Gerth

  In a blogpost Jono explained a nice way to test the latest version of Natty. Under point four he proposes: Step 4: Update Although you installed the latest daily you should ensure it is up to date, and you can do this with: sudo apt-get update sudo apt-get upgrade Now, I followed all the steps and am actually writing this question from a session running on a 4GB USB stick. When trying to update the installation though (I just tried to do that using the Update Manager), it always fails because I do not have enough disc space remaining. How can I get Ubuntu to update properly on my USB stick?

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• How do I pitch ASP.NET over PHP to a potential client?

  - by roman m

  I work at a Microsoft shop doing mainly web development. We had a client who asked us to review (improve) the data model for his web app, but said that he wants to develop his app in PHP (he knows "a guy" who can do it). When I asked him why he wants to go with PHP, he gave me the standard set of arguments from the 90's: Microsoft is evil, and PHP is free Writing an ASP.NET app is more expensive (software-wise) Why would Facebook use PHP if it was a bad idea? [classic] He had a few more comments about the costs associated with going .NET. The truth is that "Microsoft is expensive" does not hold water any longer, with their "Express" suite, you can develop an ASP.NET app without paying anything for software. When it comes to hosting, you can save a few bucks with PHP over .NET, but that's a small fraction of the projected development costs (we quoted 10-15k). Going back to my question, what arguments would I give to a client in favor of ASP.NET over PHP? [please provide sources for quantitative claims]

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• What are best practices for testing programs with stochastic behavior?

  - by John Doucette

  Doing R&D work, I often find myself writing programs that have some large degree of randomness in their behavior. For example, when I work in Genetic Programming, I often write programs that generate and execute arbitrary random source code. A problem with testing such code is that bugs are often intermittent and can be very hard to reproduce. This goes beyond just setting a random seed to the same value and starting execution over. For instance, code might read a message from the kernal ring buffer, and then make conditional jumps on the message contents. Naturally, the ring buffer's state will have changed when one later attempts to reproduce the issue. Even though this behavior is a feature it can trigger other code in unexpected ways, and thus often reveals bugs that unit tests (or human testers) don't find. Are there established best practices for testing systems of this sort? If so, some references would be very helpful. If not, any other suggestions are welcome!

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