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  • Is is OK to use a non-primary key as the id in a rails resource?

    - by nPn
    I am getting ready to set up a resource for some new api calls to my rails application. I am planning on calling the resource devices ie resources :devices This is going to represent a android mobile devices I know this will get me routes such as GET devices/:id In most cases :id would be an integer representing the primary key, and in the controller we would use :id as such: GET devices/1 @device = Device.find(params[:id]) In this case I would like to use :id as the google_cloud_messaging_reg_id So I would like to have requests like this: GET devices/some_long_gcm_id and then in the controller , just us params[:id] to look up the device by the gcm registration id. This seem more natural, since the device will know it's gcm id rather than it's rails integer id. Are there any reasons I should avoid doing this?

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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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  • ASP.NET MVC 3 RC2 Razor- Syntax Intellisense in view.

    - by Jalpesh P. Vadgama
    Microsoft has recently launched Razor view engine with ASP.NET MVC RC2. It’s going to be promising one. There are lots of features bundled with this view engine. But in earlier version of ASP.NET 3 MVC. We were are not having Synatx intellisense provided for asp.net mvc views  in Visual Studio 2010. So either we have to depend third party tools like Resharper or we have to manage it without intellisesnse. But with ASP.NET MVC 3 RC2 Microsoft has moved one step forward and its providing syntax intellisense without installing any third party addons in Visual Studio. Here is example of it. Hope you liked it. Stay tuned for more.. Happy Programming..

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  • In-memory DB to perform intersects on set slices

    - by IanC
    I have a specific programming need where I need to efficiently store large sorted sets in memory, query them for ranges, and intersect them against other sets that are also queried for ranged. I am looking at Redis, but I can't see a range slice command. MongoDB can only use 1 index, so it has to perform row-level scans, whereas I wish to process using columns that are intersected. I'm also looking at Counchbase, but can't easily determine from the documentation if it is suited to this. I know it uses Memcached, which is AFAIK not suited to this usage. Could anyone share potential solutions for this specific problem? EDIT For example, I need to perform the following: Get the IDs of all cars where the price is between 2000 and 3000, and intersect that will all cars where the engine capacity is between 3000 and 4000.

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  • What is the relationship between OpenGL, GLX, DRI, and Mesa3D?

    - by user65308
    I am starting out doing some low-level 3D programming in Linux. I have a lot of experience using the higher level graphics API OpenInventor. I know it is not strictly necessary to be aware of how all these things fit together but I'm just curious. I know OpenGL is just a standard for graphics applications. Mesa3D seems to be an open source implementation of this standard. So where do GLX and DRI fit? Digging around on Wikipedia and all these websites, I've yet to find an explanation of exactly how it all goes together. Where does hardware acceleration happen? What do proprietary drivers have to do with this? Thanks!

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  • What should I look into to find a career path?

    - by PetrakovichJ
    I am finishing up my bachelor's degree in computer science and am feeling somewhat burnt out in the field. I enjoy solving problems, programming, and using computers to find said solutions, but I feel that I never really concentrated on anything in particular and so I don't have any specialties or a path in technology to follow. I feel like a 'generic programmer' with nothing special to offer. My question is, where can I look to find this niche? I have interest in the environment, nature, sustainability, and other similar things. Is there something in these areas in particular where specialists are needed? My question is somewhat vague but where did you "find your niche"?

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  • How does a linked library combined with the main executable program file interact with a kernel?

    - by I ask Questions For a Reason
    I was attempting to find an answer to this, and I did to some degree, but definitely not anywhere good enough to form a respectable, sensible and clear answer. If I am using Windows, Mac, Linux, or nearly any modern made OS for desktop IBM-compatible PCs, laptops, even tablets and smartphones, there's virtual memory. Clearly, compiling, at least on Windows I know this, an executable object file, such as a simple C "Hello World" output to a terminal, will be linked with the standard library, and several other Window's system software, dynamic linked libraries, and the like. However, how does linking all of these executables together or resources form a connectable interaction with, say, a device driver or any other stuff on the lower level?

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  • dos games with dosbox running slow

    - by NeuroShell
    i have AMD E-450 1.65ghz, 4gb DDR3 ram, HD6320 laptop with dual boot ubuntu 13.04 and win 8.1, my main gaming rig(desktop pc) is with win7(so i am not playing serious games on this laptop) and for university i mostly use ubuntu(unix and programming tasks), for some free time i found dosbox on ubuntu software center and tryed playing several games(blood, syndicate wars) and all of them lag like hell(although on win 8.1 they work perfectly). So any suggestion how to solve the problem? i am using drivers X.org (in software settingsadditional settings) tryed proprietary ones but all screen colors was kinda strange and i couldn't control brightness at all... same dos games was lagging too.

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  • Matrix camera, movement concept

    - by NoFace
    I was talking to some guy. He said that my movement concept in game is bad. When left or right arrow is pressed I'm scrolling background what makes you feel that player is moving (player's X remains same). So... he told me something about matrix view. I should create all walls and platforms static and scroll only the camera and move player's rectangle. I did a little research in Google, but nothing found. Can you tell me anything about it? How to start? Maybe links, books and resources? My programming language is Java (2d). Thank you!

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  • Overview of the agile process that I can apply to a startup

    - by Pete2k
    I need to provide a quote to an external client for some software. I'm looking to use agile just for initial requirements building (which I'm experienced in from a developer perspective) but I need to do everything this is just a one man job. The client are having a hard time working out what there requirements are and the value I can add will be to sit down with them and work out what they want using user stories etc, I basically need to be a BA for a little bit. I am looking for good overview of the procedures to go through in the agile process for building requirements, and the continuing process a bit for further down the line. For example the initial inception through to elaboration of epics and building user stories (or not) just need to read a bit about it before the meeting so I know the best way to proceed if I spend a day with them. Having additional resources to provide to the client so that we are all on the same page would be useful too.

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  • can we make skype video hover like the windows version?

    - by Skypefan
    Oke my question is simple, My parents have a windows pc, and have skype on it. and when they are on skype they can go on the internet and still have a small video hovering over their browser and keep doing two thinks. I just want to know if there is a way to do this with ubuntu skype. or if someone can write a code or something to make this possible (I don t know much about programming and stuff) but i was just thinking :p I think a lot of people would love that function. thanks for reading!

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  • Why is n given the initial value of 1 in this loop?

    - by notypist
    From Kochan's "Programming in C": Input: printf ("TABLE OF TRIANGULAR NUMBERS\n\n"); printf (" n Sum from 1 to n\n"); printf ("--- ---------------\n"); triangularNumber = 0; for(n=1; n<=10; ++n){ triangularNumber += n; ? printf (" %i", n); } Output (only partly pasted): TABLE OF TRIANGULAR NUMBERS n = 1 Sum from 1 to n = 1 n = 2 Sum from 1 to n = 2 Question: I understand the purpose of this, but here's what I can't get my head around: If within the loop we assign an initial value of "1" to "n", then we check if n<=10, and if that's true (which it should be with the initial value), we then add "1" to n. Shouldn't (and I know it shouldn't, just don't understand why) the initial value displayed in our table be n=2 ? Thanks in advance for your patience and effort!

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  • .NET - Where can I start? [closed]

    - by mustang2009cobra
    I'm a moderately experienced developer with experience developing using a variety of languages. I've done C++, Java, PHP, Javascript, and several other languages. I remember the Java dev stack being rather difficult to dive into, but it's nothing like the endless sea of the .NET framework. I'd like to become experienced in .NET development, as many dev shops are microsoft-centric. But I'm a little unsure as to where the best place to start is. As I already know a bunch of programming languages, I don't really need resources that will help me learn C# or any of the .NET languages as much as I need to learn the development stack, APIs, etc. Any suggestions on the best way to start learning .NET development?

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  • Orienting ship movement in asteroids [closed]

    - by BadSniper
    Possible Duplicate: Move sprite in the direction it is facing? I'm programming asteroids game. I'm trying to give velocity in the direction of ship face. I've tried using velocity.x = velocity.x * cos r, velocity.y = velocity.y * sin r where velocity is a vector and r is the angle rotated. but it's not moving in right direction. Could someone help with this problem? It is supposed to return the vector in which ship is facing. I don't understand the problem.

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  • Want to work at Typemock? Were Hiring

    We are looking for a .NET\C++ developer to join the growing Typemock ranks. You need to: Live in Israel know .NET very well (at least 3 years .NET experience VB.NET or C#, and willing to learn the other one) Have some C++ experience (recent sometime in the past couple of years) Be interested in Agile development, unit testing and TDD (you dont have to be an expert. Youll become one on the job.) have very good english PASSION for programming Advantage to C++ hardcore devs but...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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  • Money investments for software developers [closed]

    - by user91590
    Let's say you (or your company) have an amount of money that you would like to invest in improving your career, and probably make more money in the long run by landing a better job or raising your productivity. There are some classical investments that anyone would suggest: spend on programming books, since they pay for themselves very quickly; buy a better chair, since you will stay on that all day; attend conferences to improve your network of contacts. I'm looking for more examples to weigh my options in the quest for improvement. Google does not help as it only shows job ads for programmers in the financial sector.

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  • Random List of numbers in C

    - by Ant
    I have just started a C programming course and so far have only done the basics like printf, read a little on variables etc on the course book. The teacher has tasked us with writing a program that will take a value entered by the user, this will be the number of students in the class (25 at the moment but can be variable). It will then list the number of students randomly and place them in 3 columns. The purpose is to sort students into groups of 3 randomly, then display on the screen in columns. Now my question is not for the code that defeats the object of me attempting the exercise, but how to structure it. I can see that using an array can be used to display the list, but really after some pointers on how best to approach the problem in blocks, then I can attempt to program each block.

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  • Scaling SQL Server in Azure

    - by simonsabin
    If you’ve been reading the wires about SQL Azure you will have seen a change to the tiers that are being offered. Thsi is all so that you can get a more predictable performance level from the platform and also to enable Azure to manage the resources. You now have 3 categories basic, standard and premium, and within those you have some other levels. This enables you to start your service at a low level and then as required request more capacity (through the portal or API).   For details on the...(read more)

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  • Am I making the right decision to take Information technology/system as my course in college?

    - by 123rainfan
    I am a student who just ended my high school last year. I will be entering college any time between march to August. And.. I am thinking of studying Information technology/System as my course in college. The problem is, I am unsure if this is the right path for me. I don't know if this is what I really want for my future later on! Yes, I do love learning more about computers (prefer software to hardware). But what if I don't find them interesting later on when studying? I'm worried about that as I don't wanna regret later on. To add to that, my knowledge of programming and other software development is actually quite low. Can someone advise me on what should I do? Or tell me more about Information technology (what will I study later on in college and the career path)?

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  • Multiple copies of JBoss acting as one? [migrated]

    - by scphantm
    I have a few ideas how to solve the problem, but one question about jboss clustering. Please, keep in mind these applications were written very poorly, that is why they require so much memory and there is nothing i can do about that right now. So, I have clustered applications on Jboss where the application was small enough to run on one box. Meaning that one machine could handle the load. But, the current problem is that i have been asked to run several systems on the same environment. Our machines are virtuals and due to limited hardware, are restricted to 8 GB RAM, which gives jboss about 7GB to itself. Unfortunately, that isn't enough to run the group of applications. Im constantly getting heap errors and crashes. If i cluster 2 or 3 jboss instances together, can i run applications that consume more resources than a single box can handle?

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  • Will taking a job that's web and database related limit my software development opportunities later on?

    - by someone
    I love programming, particularly OOP. My school experience was mostly in Java/OOP, and I had a job for a limited time in Java, Python, and other OOP kind of languages. However, a move necessitated a change in jobs, and what I've ended up with now is a web-development and database intensive job. I may possibly hold this job for several years. My question is, will this limit my choices later on? Will I be able to find another Java / software-development kind of job, or will I be rejected because my experience will be mostly in a different area?

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  • What's New in JMS 2 - Part 1

    - by reza_rahman
    JMS 2 is one of the most significant parts of Java EE 7. One of the principal goals of the JMS 2 API is improving developer productivity by reducing the amount of code to work with JMS by adopting programming paradigms like higher level abstractions, dependency injection, annotations, runtime exceptions, the builder pattern and intelligent defaults. In a recent OTN article, JMS 2 specification lead Nigel Deakin covers the ease-of-use changes in detail. The article is the first of a two part series on JMS 2. For more visual folks, there is my JMS 2 slide deck: What’s New in Java Message Service 2 from Reza Rahman You can also check out the official specification yourself or try things out with the newly released Java EE 7 SDK.

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  • Add valuable dynamic content to a mobile oriented (local) website, any suggestions?

    - by cesko80
    HI to all, I'm developing a mobile website containing some valuable dynamic content for people living in my city. I did find some useful informations that aren't available in a quick, light mobile format and I added to my site: teathers' programming, pharmacy shops open at night, twitter account embedding... have you got any other suggestion? I was thinking about facebook oauth to add some "social" feel, but I woluld like to avoid cloning fb information/features, just add some other cool addictive thing. I 'm using php for dynamic contents.

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  • How to use HTTP Handler to make a client2client communication? [closed]

    - by meorfi
    I'm new to Web programming! I try to make an app (something like Client to Client communication with C# Handlers and jQuery). I.E.: When 1Client make a click on his clientSide(browser), there paints one point, and on the same time the 2Client sees what 1Client did. And, in turn, where 2Client make a click on his browser, there paints one point, and the 1Client also sees what 2Client did. I could done already the configuration of IIS, I made an simple show Hello World and it run OK. And, further, what should i done.... Can you advice me, please, with some exemples, or tutorials, how to do this job. Sorry for my questions which seems to be not studied.

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  • Multiplayer in a game. How to design it object wise?

    - by Ninetou
    I was suggested on StackOverflow to ask this question here. I'm working on a simple game and I was thinking of adding multiplayer feature but I'm a bit stuck. I'm not sure what approach should I take, keeping in mind good programming practices. I have a Player object which is created for each player but then I have many other classes that would have to be able to access them. The thing is, if I initialise them in, let's say my main method, then I can't relate to different instances of player class from other classes. The only solution to my problem that comes to my mind is using some form of global objects but afaik using anything globally in apps is usually not a good practice. Any suggestions/ideas?

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