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• How do I get my programs to communicate with each other

  - by Benjamin Lindqvist

  I'm basically just getting started with programming. The problem I have with progressing is that I have a hard time learning stuff just for the sake of knowing them - I do better when there's a problem to be solved or a task to be completed so I can learn 'on the job'. So I'm interested in starting some interesting project. I know the basics of Python, Java, Matlab and some C++ aswell and I know enough about microcontrollers to make LED blink etc. The type of stuff I'm looking for is for example scraping some weather forecast site (with Python) and outputting the chance of rain to a LCD display, or a program that makes chrome open and log in to facebook if I say "HAL, time for facebook", or more generally, a program that reads serial/USB input, looks for certain sequences and sends instructions to some other program if it finds one. Do you open some kind of shared stream in which one program reads and one writes? What do I need to read up on to do accomplish this myself? I have no experience with linux or the linux terminal, but looking over peoples shoulders makes me suspect that's what people use. Is that correct?

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• Learning Programming from scratch

  - by David542

  I am entirely new to programming, other than basic HTML/CSS knowledge. I want to learn programming as quickly and efficiently as possible, and I'm willing to put in the time (at least 70 hours a week). The reason I want to learn is because I have a startup that I've written a business plan for and have prototyped in Photoshop (both front-end and back-end pages). My goals is to have a prototype of the site up within 6 months. I have a good aptitude for math (A's in all math courses up through DiffEq and Linear Algebra). I assume learning programming from scratch can be a daunting task -- not because it is particularly difficult, but because there are so many areas and so much information. I want to make sure that I learn as efficiently as possible and have individuals (in addition to Google) to solicit advice from and that will help me when I get stuck or have questions. I know with other's help, my learning experience will be both more productive and enjoyable. What is the best way to find people that will help me in this? What are some good 'live' resources in addition to asking questions on Stack Overflow? Thank you very much for your time and help.

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• Why do the GNOME symbolic icons appear darker in a running application?

  - by David Planella

  I'm creating an application that uses symbolic icons from the default theme. However, there are a few icons that I need that cannot be represented by those from the default theme, so I'm creating my own ones. What I did was to simply go to /usr/share/icons/gnome/scalable/actions/, copied a few locally into my app's source tree that could serve as a basis, and started editing them. So far so good. But I've noticed the following: all symbolic icons are of a light grey color when looking at the original .svg file, but when they are put onto a widget, they become darker. Here's an example, using the /usr/share/icons/gnome/scalable/actions/view-refresh-symbolic.svg icon from the default theme: Here's what it looks like when opening the original with Inkscape: And here's what it looks like on a toolbar on a running application: Notice the icon being much darker at runtime. That happens both with the Ambiance and Radiance themes. I wouldn't mind much, but I noticed it affects my custom icon, whereby parts of it become darker (the inner fill), whereas parts of it remain the same color as the original (the stroke). So what causes the default symbolic icons to darken and how should implement that for my custom icons?

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• How In-Memory Database Objects Affect Database Design: Hybrid Code

  - by drsql

  In my first attempts at building my code, I strictly went with either native or on-disk code. I specifically wrote the on-disk code to only use features that worked in-memory. This lead to one majorly silly bit of code, used to create system assigned key values. How would I create a customer number that was unique. We can’t use the Max(value) + 1 approach because it will be very hideous with MVCC isolation levels, since 100 connections might see the same value, leading to lots of duplication. You...(read more)

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• Online Poker Game Programming

  - by Eyal

  I am trying to write a massive online multiplayer client for a poker site, where one user can be on a Flash client and the other on say an iOS client (iPhone / iPad), and would like to know how can interaction between two users be visible on both clients. What would be better to use? Should I use MSMQ? AJAX? Something other? I need the messaging layer (client interaction messages) to scale up to 100K+ online users to begin with. In other words; What scalable technology can I use to make game interactions between online users visible to all game participants?

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• How should I describe the process of learning someone else's code? (In an invoicing situation.)

  - by MattyG

  I have a contract to upgrade some in-house software for a large company. The company has requested multiple feature additions and a few bug fixes. This is my first freelance style job. First, I needed to become familiar with how the application worked - I learnt it as if I was a user. Next, I had to learn how the software worked. I started with broad concepts, and then narrowed down into necessary detail before working on each bug fix and feature. At least at the start of the project, it took me a lot longer to learn the existing code than it did to write the additional features. How can I describe the process of learning the existing code on the invoice? (This part of the company usually does things in-house, so doesn't have much experience dealing with software contractors like me, and I fear they may not understand the overhead of learning someone else's code). I don't want to just tack the learning time onto the actual feature upgrade, because in some cases this would make a 'simple task' look like it took me way too long. I want break the invoice into relevant steps, and communicate that I'm charging for the large overhead of learning someone else's code before being able to add my own to it. Is there a standard way of describing this sort of activity when billing for a job?

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• Language-independent sources on collision detection

  - by Phazyck

  While making a Pong clone with a friend, we had to implement some collision detection. For research purposes, my friend dug up a book called "AdvancED Game Design with Flash" by Rex Van Der Spuy. This book was clearly targeted at implementing collision detection in ActionScript, and I also have some problems with how the concepts are presented, e.g. presenting one method as better than another, without explaining that decision. Can anyone recommend some good material on collision detection? I'd prefer it if kept the implementation details as language-independent as possible, e.g. by implementing the concepts in pseudo-code. Language-specific materials are not completely unwelcome though, though I'd prefer those to be in either Java, C#, F# or Python or similar languages, as those are the ones I'm most familiar with. :-) Lastly, is there perhaps widely known and used book on collision detection that most people should know about, like a 'the book on collision detection'?

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• Utility Queries–Database Files, (and Filegroups)

  - by drsql

  It has been a while since I last posted a utility query, and today, to avoid other work I am supposed to be doing, I decided to go ahead and work on another post.  Today, I went ahead and worked on a server configuration type query. One query I find I use pretty often is the following one that lists the files in the database. In this blog I will include 3 queries.  The first will deal with files and databases, and the second runs in a database to see the files and their filegroups (If there...(read more)

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• How does session middleware generally verify browser sessions?

  - by BBnyc

  I've been using session middleware to build web apps for years: from PHP's built-in session handling layer to node's connect session middleware. However, I've never tried (or needed) to roll my own session handling layer. How would one go about it? What sort of checks are necessary to provide at least some modicum of security against HTTP session highjacking? I figure setting a cookie with a token to keep track of the session, and then perhaps some check to see that the originating IP address of the session doesn't change and that the client browser software remains consistent. Hoping to hear about current best-practices...

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• Getting the URL to the Content Type Hub Programmatically in SharePoint 2010

  - by Damon

  Many organizations use the content-type hub to manage content-types in their SharePoint 2010 environment.  As a developer in these types of organizations, you may one day find yourself in need of getting the URL of the content type hub programmatically.  Here is a quick snippet that demonstrates how to do it fairly painlessly: public static Uri GetContentTypeHubUri(SPSite site) {     TaxonomySession session = new TaxonomySession(site);     return Session.DefaultSiteCollectionTermStore         .ContentTypePublishingHub; }

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• Involving kids into programing - which language? [closed]

  - by boj

  Possible Duplicate: What are some good tools for introducing kids to programming? Long-long time ago I had a great book by Frank DaCosta about writing adventure games in Basic, it had a great influence on me. I would like to show the world of programming to my child too but I have two problems: I can not found books like DaCosta's (but we can replace it with our fantasy so not a big deal) Which programming language should I use? Small Basic?

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• Application won't run when installed in "/opt"

  - by Sam Hewitt

  I've developed a program for the App Developer Showdown, with quickly, in python, and it works as expected when I package and install it normally -in /usr. However when packaged for installation in /opt it doesn't run -and I'm not getting (or can't find) an error message of any sort, as to what the problem might be. I was wondering if someone here has the answer. The app does require root access -using gksudo- to function. I'm fairly new to programming, but not to Linux. Thanks, Sam Launchpad: https://launchpad.net/aplomb

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• Is it illegal to use content in such a way?

  - by MHZ

  I have a couple of questions about the legality of the content of some websites. I am currently working on two websites and I would like to make sure I am not breaking any laws, by using some content like I am... Do I need to get a license to use images from the Internet (such as google.images.com) in my site, assuming they aren't a company logo belonging to another company? If not, am I allowed to use it after I modify it with a image editing software? If content such as phone numbers, e-mail addresses, website addresses, and text from websites can be found for free online, and I gather this information for a search engine based site that I am working on and offering this information on a paid basis (similar to google, but more specialized), is something that is legal? Note: I am not 'copying' or redirecting business from anywhere, to my site. The exact opposite, the site I am working on actually helps advertise businesses and make it easier for customers to find them.

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• Is it costly to leave the Console and Script features enabled in Firebug?

  - by parisminton

  For some time now, I've run Firebug constantly enabled to do quick DOM inspections, leaving the Console and Script panels disabled. I'm just starting to use these two features so I don't have to keep using alerts for testing and debugging. I enable them while I use them and turn them back off when I'm done. I'd like to know if these particular features can slow things down such that they shouldn't be left on round-the-clock. Like do they slow down page loads, use inordinate chunks of memory or something? I don't see anything about it in the Firebug wiki.

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• Is it costly to leave the Console and Script features enabled in Firebug?

  - by parisminton

  For some time now, I've run Firebug constantly enabled to do quick DOM inspections, leaving the Console and Script panels disabled. I'm just starting to use these two features so I don't have to keep using alerts for testing and debugging. I enable them while I use them and turn them back off when I'm done. I'd like to know if these particular features can slow things down such that they shouldn't be left on round-the-clock. Like do they slow down page loads, use inordinate chunks of memory or something? I don't see anything about it in the Firebug wiki.

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• How stable are Single Page Application (SPA) build with Microsoft .Net for enterprise application [on hold]

  - by Husrat Mehmood

  Imagine a situation where you have your data loading to your application via REST Api,you are building a responsive application(ajax request) for an Enterprise. What potential problems might I run into for a single page application(SPA) using Microsoft Asp.Net Web application build using MVC template? Are there advantages to just designing a multi-page application using asp.net mvc 5 remember I am using SPA for an Enterprise Application where there are role based views for the users.?

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• How can I clone or mirror a site without SEO penalties for duplicate content?

  - by Amanda

  I am a web developer and I want to create clones of the sites I've developed for clients, so that I have an "original copy" on a subdomain of my own website, so that I can showcase my work to new clients. What is the best way to not get my clients original websites penalised for duplicate content? I am planning to have a robots.txt file that disallows all robots, as well as using <link href="http://www.client-canonical-site.com/" rel="canonical" /> in the <head> of the pages. Is that sufficient? Should I use rel=nofollow on all the links as well?

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• Should a primary key be immutable?

  - by Vincent Malgrat

  A recent question on stackoverflow provoked a discussion about the immutability of primary keys. I had thought that it was a kind of rule that primary keys should be immutable. If there is a chance that some day a primary key would be updated, I thought you should use a surrogate key. However it is not in the SQL standard and some RDBMS' "cascade update" feature allows a primary key to change. So my question is: is it still a bad practice to have a primary key that may change ? What are the cons, if any, of having a mutable primary key ?

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• What is the canonical resource on multi-tenancy web applications using ruby + rails

  - by AlexC

  What is the canonical resource on multi-tenancy web applications using ruby + rails. There are a number of ways to develop rails apps using cloud capabilities with real elastic properties but there seems to be a lack of clarity with how to achieve multitenancy, specifically at the model / data level. Is there a canonical resource on options to developing multitenancy rails applications with the required characteristics of data seperation, security, concurrency and contention required by an enterprise level cloud application.

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• Ubuntu App Submission won't allow the "free" bubble to be checked

  - by Compt

  I am at the final stages of the Ubuntu App Developer Showdown, and I'm right at the point where I am submitting my app. The problem I run in to however, is that even though buy is at $0.00, it will not allow me to click on the "free" button, and keep that configuration saved. So when I go to "preview your app", it shows it saying "USD $0.00 ---- Buy" instead of saying "Free ---- Install". So I was wondering if it makes any difference or not.

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• Rules of Holes #4 -Do You Have the BIG Picture?

  - by ArnieRowland

  Some folks decry the concept of being in a 'Hole'. For them, there is no such thing as 'Technical Debt', no such thing as maintaining weak and wobbly legacy code, no such thing as bad designs, no such thing as under-skilled or poorly performing co-workers, no such thing as 'fighting fires', or no such thing as management that doesn't share the corporate vision. They just go to work and do their job, keep their head down, and do whatever is required. Mostly. Until the day they are swallowed by the...(read more)

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• How to insert in a blog sharing links to visitors Tweet, Facebook and so on social networks?

  - by Andry

  I am developing a web blog using ASP.NET, but I guess that the tech details like this, here, is not important. My aim is to insert in every post I create those nice buttons to the social networks account of my visitors so that they can quote or post the link to the blog entry in their space. How can I do this? I guess it also de3pend on the social network I want to use. Lets say, now, that I want to have links to Facebook, Tweet and Google circle accounts. Thankyou.

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• How can you predict the time it will take for two processes in two different machines in a cluster to communicate?

  - by Dokkat

  I am trying to develop a computing application which needs a lot of memory (500gb). Buying a single machine for that is overly expensive. I can, though, buy ~100 small instances on Digital Ocean or similar, divide the memory in blocks and use TCP to emulate shared memory between the instances. Now, my question is: how can I measure/predict the time it will take for two processes in two different machines like that to share information, in comparison to IPC and shared memory? Are there rules of thumb? I don't want exact values, but knowing more or less how much faster one is would be very helpful in visualising the feasibility of this approach.

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• Sucking Less Every Year ?

  - by AdityaGameProgrammer

  Sucking Less Every Year A trail of thought that had been on my mind for a while Quoting directly from the post I've often thought that sucking less every year is how humble programmers improve. You should be unhappy with code you wrote a year ago. If you aren't, that means either A) you haven't learned anything in a year, B) your code can't be improved, or C) you never revisit old code. All of these are the kiss of death for software developers. How often does this happen or not happen to you? How long before you see an actual improvement in your coding ? month, year? Do you ever revisit Your old code? How often does your old code plague you? or how often do you have to deal with your technical debt. It is definitely very painful to fix old bugs n dirty code that we may have done to quickly meet a deadline and those quick fixes ,some cases we may have to rewrite most of the application/code. No arguments about that. Some of the developers i had come across argued that they were already at the evolved stage where their coding doesn't need improvement or cant get improved anymore. Does this happen? If so how many years into coding on a particular language does one expect this to happen?

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• SQL Profiler Through StreamInsight Sample Solution

  In this postI show how you can use StreamInsight to take events coming from SQL Server Profiler in real-time and do some analytics whilst the data is in flight.  Here is the solution for that post.  The download contains Project that reads events from a previously recorded trace file Project that starts a trace and captures events in real-time from a custom trace definition file (Included) It is a very simple solution and could be extended.  Whilst this example traces against SQL Server it would be trivial to change this so it profiles events in Analysis Services.       Enjoy.

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