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Establishing relationships with unsolicited recruiters

- by Michael

Several times each year, I receive unsolicited introductions from tech recruiters, usually via LinkedIn and usually local firms. I am not currently looking for a new job. Is it advisable to establish a relationship with one or more recruiters when I'm not interested in finding new work, so that they have my resume on file? Here's another way I approach the question: My plumber was first hired at the point of need: I had a plumbing problem, looked up a few of them, and evaluated and hired based on their demeanor and cost estimates. I established a relationship with a general attorney, on the other hand, well in advance of ever actually needing services so that if or when services are needed he already knows enough about me to begin work. Should I approach recruiters like I approached my plumber or my lawyer? A separate discussion, I suppose, is whether or not the type of recruiters who troll LinkedIn for clients are generally helpful or not. Edit: I have never worked with a recruiter before, and therefore have little idea what to expect.

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perl array of hashes sorting

- by srk

use strict; my @arr; $arr[0][0]{5} = 16; $arr[0][1]{6} = 11; $arr[0][2]{7} = 25; $arr[0][3]{8} = 31; $arr[0][4]{9} = 16; $arr[0][5]{10} = 17; sort the array based on hash values so this should change to $arr[0][0]{6} = 11; $arr[0][1]{9} = 16; $arr[0][2]{5} = 16; $arr[0][3]{10} = 17; $arr[0][4]{7} = 25; $arr[0][5]{8} = 31; first sort on values in the hash.. when the values are same reverse sort based on keys... Please tell me how to do this.. Thank you

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Announcing the Winnipeg Code Camp!

- by D'Arcy Lussier

Alright, the event website will be up this weekend, but I wanted to get the word out sooner than later. For the third year, we’re holding the Winnipeg Code Camp! When: Saturday, February 26th Where: Red River College, Princess Street Campus Cost: FREE!!! Continental Breakfast and Hot Lunch Provided! We’re going to have four rooms worth of sessions going on like last year, so lots of great sessions and great content. To register for the event (we need to know numbers for ordering the food), please do so here: http://www.eventbrite.com/event/1180632303 If you’re interested in speaking at the Code Camp, please contact me at darcy.lussier at gmail.com. Note that we have only 20 slots for the day, so contact me sooner than later! D

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Is this scenario in compliance with GPLv3?

- by Sean Kinsey

For arguments sake, say that we create a web application , that depends on a GPLv3 licensed component, lets say Ext JS. Based on Section 0 of the license, the common notion is that the entire web application (the client side javascript) falls under the definition of a covered work: A “covered work” means either the unmodified Program or a work based on the Program. and that it will therefor have to be distributed under the same license Ok, so here comes the fun part: This is a short 'program' that is based on Ext JS var myPanel = new Ext.Panel(); The question that arises is: Have I now violated the GPL by not including the source of Ext JS and its license? Ok, so lets take another example <!doctype html> <html> <head> <title>my title</title> <script type="text/javascript" src="http://extjs.cachefly.net/ext-3.2.1/ext-all.js"> </script> <link rel="stylesheet" type="text/css" href="http://extjs.cachefly.net/ext-3.2.1/resources/css/ext-all.css" /> <script type="text/javascript"> var myPanel = new Ext.Panel(); </script> </head> <body> </body> </html> Have I now violated the terms of the GPL? The code conveyed by me to you is in a non-functional state - it will have to be combined with the actual source of Ext JS, which you(your browser) will have to retrieve, from a source made public by someone else to be usable. Now, if the answer to the above is no, how does me conveying this code in visible form differ from the 'invisible' form conveyed by my web server? As a side note, a very similar thing is done in Linux with many projects that depends on less permissive licenses - the user has to retrieve these on its own and make these available for the primary lib/executable. How is this not the same if the user is informed on beforehand that he (the browser) will have to retrieve the needed resources from a different source? Just to make it clear, I'm pro FLOSS, and I have also published a number of projects licensed under more permissive licenses. The reason I'm asking this is that I still haven't found anyone offering a definitive answer to this.

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Webinar: Integrated Sales & Marketing - An Impossible Dream?

- by charles.knapp

Are you making the most of the latest B2B marketing thinking? Are your marketing tactics, your outbound email campaigns and your SEO generating enough of the prospects and leads that your sales teams need? Are your sales and marketing functions aligned and working together with optimised results? In this Webinar with MarketingWeek Magazine, find out how: - To ensure your marketers create and deliver consistently effective, and targeted campaigns - You can triple the customer intelligence your marketers gather, ensuring your sales teams are better informed and qualified than ever before - Generate up to 200% growth in lead volume and start measuring marketing effectiveness against increase in sales and size of an average deal - And hear how BPI OnDemand has delivered integrated sales & marketing across industries, with results such as 100% ROI on system cost for Heal's after just one campaign

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How to conditionally execute a jquery validation?

- by Pandiya Chendur

I am validating form using jquery validation plugin...... rules: { Name: "required", MobileNo: { required: true, minlength: 10, remote: '<%=Url.Action("getClientMobNo", "Clients") %>' }, Address: "required" }, messages: { Name: "please provide a client name", MobileNo: { required: "Please provide a mobile phone no", rangelength: jQuery.format("Enter at least {0} characters"), remote: jQuery.format("This MobileNo is already in use") }, Address: "please provide client address" }, This works pretty well on add form validation but i use the same form for edit here they can use the same mobile no,but my plugin validates that mobileno saying there is already a mobileno... But how to execute remote attribute based on a condition, MobileNo: { required: true, minlength: 10, if($("#HfId").val() == ""){ remote: '<%=Url.Action("getClientMobNo", "Clients") %>' } }, Is this a valid jquery conditional validation statement.... How to skip remote attribute based on a condition....

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Alignment of Hebrew Vowel points in Android

- by Aharon Manne

I want to display Hebrew text with vowel points (nikkud) using the Canvas.drawText interface. The vowel points come out misaligned, as in the following image taken using a Motorola Defy+ device: The hiriq is between the resh and the yod, the holam between the vav and nun. I have added the rtl code (\u200F) to the string at both ends, no joy. I know that there are applications that have solved this problem, such as the Smart Siddur. Is there a difference between text-based applications and graphics based? I would think that the same engine renders the text in both cases. I suppose I could split up the string and place the vowels separately, but that seems pretty painful and not extensible. TIA for any clues.

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eAccelerator Issue - Cache Directory Empty.

- by Tom

Hi all, Hoping someone can give me a hand with this. I've recently installated eAccelerator 0.9.6.1 - On a CentOS LAMP server. Had it working fine, using the /tmp/accelerator as the cache directory. php.ini set up: zend_extension="/usr/local/lib/php/extensions/no-debug-non-zts-20060613/eaccelerator.so" eaccelerator.shm_size="200" eaccelerator.cache_dir="/var/cache/eaccelerator" eaccelerator.enable="1" eaccelerator.optimizer="1" eaccelerator.check_mtime="1" eaccelerator.debug="0" eaccelerator.filter="" eaccelerator.shm_max="0" eaccelerator.shm_ttl="3600" eaccelerator.shm_prune_period="180" eaccelerator.shm_only="1" eaccelerator.compress="1" eaccelerator.compress_level="9" php -v output: PHP 5.2.12 (cli) (built: Feb 3 2010 00:34:28) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies with eAccelerator v0.9.6.1, Copyright (c) 2004-2010 eAccelerator, by eAccelerator with the ionCube PHP Loader v3.3.20, Copyright (c) 2002-2010, by ionCube Ltd. I had to remove the cache directory as I was testing something. Remade it, re-set permissions and found that eAccelerator was no longer creating cache files within the folder. I thought it might be down to ownership rights on the folder so chown'd it apache.apache and this made no difference. I recreated the directory in /var/cache instead and editted php.ini to point to the new cache dir location, chmod'd, chown'd etc. and still eAccelerator is not creating any of the cache files in the directory (just empty). Could someone suggest what I might be doing incorrectly here. I've read through numerous pages to try and troubleshoot the issue to no avail. Any help appreciated.

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Are all languages used within .net Equally performant?

- by WeNeedAnswers

I know the "Sales pitch" answer is yes to this question, but is it technically true. The Common Language Runtime (CLR) is designed as an intermediate language based on Imperative Programming (IP), but this has obvious implications when dealing with Declarative Programming (DP). So how efficient is a language based on a different paradigm than the Imperative Style when implemented in the CLR? I also get the feeling that the step to DP would incur an extra level of abstraction that might not model at all performant, would this be a fair comment? I have done some simple tests using F# and it all looks great, but am I missing something if the programs get more complex?

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Accurate Timings with Oscilloscopes on PC

- by Paul Bullough

In the world of embedded software (firmware) it is fairly common to observe the order of events, take timings and optimise a program by getting it to waggle PIO lines and capturing their behavior on an oscilloscope. In days gone by it was possible to toggle pins on the serial and parallel ports to achieve much the same thing on PC-based software. This made it possible to capture host PC-based software events and firmware events on the same trace and examine host software/firmware interactions. Now, my new laptop ... no serial or parallel ports! This is increasingly the case. So, does anyone have any suggestions as to go about emitting accurate timing signals off a "modern" PC? It strikes me that we don't have any immediately programmable, lag-free output pins left. The solution needs to run off a laptop, so using add-on cards that only plug into desktops are not permitted.

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Payback Is The Coupon King

- by Troy Kitch

PAYBACK GmbH operates the largest marketing and couponing platforms in the world—with more than 50 million subscribers in Germany, Poland, India, Italy, and Mexico. The Security Challenge Payback handles millions of requests for customer loyalty coupons and card-related transactions per day under tight latency constraints—with up to 1,000 attributes or more for each PAYBACK subscriber. Among the many challenges they solved using Oracle, they had to ensure that storage of sensitive data complied with the company’s stringent privacy standards aimed at protecting customer and purchase information from unintended disclosure. Oracle Advanced Security The company deployed Oracle Advanced Security to achieve reliable, cost-effective data protection for back-up files and gain the ability to transparently encrypt data transfers. By using Oracle Advanced Security, organizations can comply with privacy and regulatory mandates that require encrypting and redacting (display masking) application data, such as credit cards, social security numbers, or personally identifiable information (PII). Learn more about how PAYBACK uses Oracle.

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How to change Arrow Keys Behavior?

- by SO give me back my rep

Hi, I am doing a cool menu (sorta XMB) to give a fresh touch to my app... I add all of the elements on the menu programatically via DB. the menu is designed for easy use with arrows keys but I have encountered a major problem!!! by default when I press the arrow keys they only change the focus based on the tabindex and what I need is to change focus based on position of the controls not on their tabindex hope it is clear... see pic!!! so, Is there any way to do this?

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Triangle Strips and Tangent Space Normal Mapping

- by Koarl

Short: Do triangle strips and Tangent Space Normal mapping go together? According to quite a lot of tutorials on bump mapping, it seems common practice to derive tangent space matrices in a vertex program and transform the light direction vector(s) to tangent space and then pass them on to a fragment program. However, if one was using triangle strips or index buffers, it is a given that the vertex buffer contains vertices that sit at border edges and would thus require more than one normal to derive tangent space matrices to interpolate between in fragment programs. Is there any reasonable way to not have duplicate vertices in your buffer and still use tangent space normal mapping? Which one do you think is better: Having normal and tangent encoded in the assets and just optimize the geometry handling to alleviate the cost of duplicate vertices or using triangle strips and computing normals/tangents completely at run time? Thinking about it, the more reasonable answer seems to be the first one, but why might my professor still be fussing about triangle strips when it seems so obvious?

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DDD and filtering

- by tikhop

I am developing an app in ddd maner. So I have a complex domain model. Suppose I have a Fare object and Airline. Each Airline should contain several or much more Fares. My UI should represent Model (only small part of complex model) as a list of Airline, when the user select the Airline, I must show the list of Fares. User can filtering the Fares (by travel time, cost, etc.). What is the appropriate place for filtering Fares and Airlines? I am assuming that I should do it in ViewModel. Like: My domain model has wrapped with Service Layer - UI works with ViewModel - ViewModel obtain data from Service Layer filtering it and create DTO objects for UI. Or I'm wrong?

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T-SQL Picking up active IDs from a comma seperated IDs list

- by hammayo

I have two tables "Product" having following structure: ProductID,ProductName, IsSaleTypeA, IsSaleTypeB, IsSaleTypeC 1, AAA, N, N, N 2, BBB, N, Y, N -- active 3, CCC, N, N, N 4, DDD, Y, N, N -- active 5, EEE, N, N, N 6, FFF, N, N, N 7, FFE, N, N, N 8, GGG, N, N, N 9, HHH, Y, N, N -- active The second table "ProductAllowed" having following structure where ProductIDs is a comma separated string filed having mix of active and inactive product ids based on their IsSaleType mode. ProductCode, ProductIDs AMRLSPN, "1,2" AMRLOFD, "1,3" BLGHVF, "2,4,6" BLGHVO, "2,4" BLGHVD, "3,5" BLGSDO, "0" CHOHVF, "1,6" CHOHVP, "1,2,7,8" ... ... Q: Is there a t-sql query that will return a list of active records from the "ProductAllowed" table if any of three IsSaleType fileds is/are switched on for a product. Based on the sample data the ProductAllowed records should return following records. AMRLSPN BLGHVF BLGHVO BLGSDO CHOHVP This needs to be applied in a SQLSERVER 2000 database containing aprox 150000 records. Thanks

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Good piece of software that can manage the creation of complex web forms, including reporting, etc?

- by Callum

I have some clients who are requesting for some of their reasonably complex paper-based forms to be converted in to web forms. There's straight Q&A text input stuff, there's questions based around checkboxes, radio boxes, select boxes, maybe the occasional attached image, there's data that has to be entered in a tabular fashion, etc. I am deciding whether I should build a "platform" with properly normalised tables to store all types of form data. But before that, I thought I had better check and see if there is anything like that already on the market. I am looking for a product that can: * Easily create web forms of all types * Store all data in a database * Extensive reporting capability I have had a bit of a look around but there's not a whole lot I can see. Does anyone have any suggestions? Thanks.

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iPhone+Quartz+OpenGL. What is the correct way for Quartz and OpenGL to play nice together regarding

- by dugla

So we know the CoreGraphics/Quartz imaging model is based on pre-multiplied alpha. We also know that OpenGL blending is based on un-premultiplied alpha. What is the best practice to avoid head explosion when doing blending with textures that are derived from pre-multiplied alpha imagery (PNG files generated in Photoshop with pre-multiplied alpha). Given the apples/oranges mish mash of Quartz and OpenGL, what is the correct glBlendFunc for doing the fundamental Porter/Duff "over" operation? Typical example: A simple paint program. Brush shapes are texture-map patterns created from pre-multiplied alpha rgba images. Paint color is specified via glColor4(...) with the alpha channel used to control paint transparency. GL_MODULATE is used so the brush texture multiplies the (translucent) paint color to blend the color into the canvas. Problem: The texture is premult. The color is not. What is the correct way to handle this fundamental inconsistency? Thanks, Doug

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Create list in existing site collection from a feature

- by keysersoze

I have created a feature, a publishing site, in Visual Studio to MOSS - this feature contains a masterpage, some page-templates, some site columns (grouped to match each page-template) and som custom list templates etc. I have also created a site collection, some sites and pages based on my feature. Now I have upgraded the code in my feature - I wanted a ListInstance to be created based on my custom list template. When I have upgraded my SharePoint (using WSPBuilder), the ListInstance and default data are visible if I create a new site collection, but existing site collection does not get the ListInstance and data. Is there anything I can do to update existing site collections to contain the ListInstance when upgrading?

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Is File#print atomic when given multiple arguments?

- by Andrew Grimm

For C-based implementations of ruby 1.8 and ruby 1.9, is File#print atomic when it is given multiple arguments?

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Brand New Oracle WebLogic 12c Online Launch Event, December 1, 10am PT

- by B Shashikumar

The brand new WebLogic 12c will be launched on December 1st with a 2-hour global webcast highlighting salient capabilities and benefits and featuring Hasan Rizvi, SVP, Oracle Fusion Middleware and Java. For the more techie types, the 2nd hour will be a developer focused discussion including multiple demos and live Q&A. Please join us, with your fellow IT managers, architects, and developers, to hear how the new release of Oracle WebLogic Server is: Designed to help you seamlessly move into the public or private cloud with an open, standards-based platform Built to drive higher value for your current infrastructure and significantly reduce development time and cost Enhanced with transformational platforms and technologies such as Java EE 6, Oracle’s Active GridLink for RAC, Oracle Traffic Director, and Oracle Virtual Assembly Builder

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Part 1 - Load Testing In The Cloud

- by Tarun Arora

Azure is fascinating, but even more fascinating is the marriage of Azure and TFS! Introduction Recently a client I worked for had 2 major business critical applications being delivered, with very little time budgeted for Performance testing, we immediately hit a bottleneck when the performance testing phase started, the in house infrastructure team could not support the hardware requirements in the short notice. It was suggested that the performance testing be performed on one of the QA environments which was a fraction of the production environment. This didn’t seem right, the team decided to turn to the cloud. The team took advantage of the elasticity offered by Azure, starting with a single test agent which was provisioned and ready for use with in 30 minutes the team scaled up to 17 test agents to perform a very comprehensive performance testing cycle. Issues were identified and resolved but the highlight was that the cost of running the ‘test rig’ proved to be less than if hosted on premise by the infrastructure team. Thank you for taking the time out to read this blog post, in the series of posts, I’ll try and cover the start to end of everything you need to know to use Azure to build your Test Rig in the cloud. But Why Azure? I have my own Data Centre… If the environment is provisioned in your own datacentre, - No matter what level of service agreement you may have with your infrastructure team there will be down time when the environment is patched - How fast can you scale up or down the environments (keeping the enterprise processes in mind) Administration, Cost, Flexibility and Scalability are the areas you would want to think around when taking the decision between your own Data Centre and Azure! How is Microsoft's Public Cloud Offering different from Amazon’s Public Cloud Offering? Microsoft's offering of the Cloud is a hybrid of Platform as a Service (PaaS) and Infrastructure as a Service (IaaS) which distinguishes Microsoft's offering from other providers such as Amazon (Amazon only offers IaaS). PaaS – Platform as a Service IaaS – Infrastructure as a Service Fills the needs of those who want to build and run custom applications as services. Similar to traditional hosting, where a business will use the hosted environment as a logical extension of the on-premises datacentre. A service provider offers a pre-configured, virtualized application server environment to which applications can be deployed by the development staff. Since the service providers manage the hardware (patching, upgrades and so forth), as well as application server uptime, the involvement of IT pros is minimized. On-demand scalability combined with hardware and application server management relieves developers from infrastructure concerns and allows them to focus on building applications. The servers (physical and virtual) are rented on an as-needed basis, and the IT professionals who manage the infrastructure have full control of the software configuration. This kind of flexibility increases the complexity of the IT environment, as customer IT professionals need to maintain the servers as though they are on-premises. The maintenance activities may include patching and upgrades of the OS and the application server, load balancing, failover clustering of database servers, backup and restoration, and any other activities that mitigate the risks of hardware and software failures. The biggest advantage with PaaS is that you do not have to worry about maintaining the environment, you can focus all your time in solving the business problems with your solution rather than worrying about maintaining the environment. If you decide to use a VM Role on Azure, you are asking for IaaS, more on this later. A nice blog post here on the difference between Saas, PaaS and IaaS. Now that we are convinced why we should be turning to the cloud and why in specific Azure, let’s discuss about the Test Rig. The Load Test Rig – Topology Now the moment of truth, Of course a big part of getting value from cloud computing is identifying the most adequate workloads to take to the cloud, so I’ve decided to try to make a Load Testing rig where the Agents are running on Windows Azure. I’ll talk you through the above Topology, - User: User kick starts the load test run from the developer workstation on premise. This passes the request to the Test Controller. - Test Controller: The Test Controller is on premise connected to the same domain as the developer workstation. As soon as the Test Controller receives the request it makes use of the Windows Azure Connect service to orchestrate the test responsibilities to all the Test Agents. The Windows Azure Connect endpoint software must be active on all Azure instances and on the Controller machine as well. This allows IP connectivity between them and, given that the firewall is properly configured, allows the Controller to send work loads to the agents. In parallel, the Controller will collect the performance data from the agents, using the traditional WMI mechanisms. - Test Agents: The Test Agents are on the Windows Azure Public Cloud, as soon as the test controller issues instructions to the test agents, the test agents start executing the load tests. The HTTP requests are issued against the web server on premise, the results are captured by the test agents. And finally the results are passed over to the controller. - Servers: The Web Server and DB Server are hosted on premise in the datacentre, this is usually the case with business critical applications, you probably want to manage them your self. Recap and What’s next? So, in the introduction in the series of blog posts on Load Testing in the cloud I highlighted why creating a test rig in the cloud is a good idea, what advantages does Windows Azure offer and the Test Rig topology that I will be using. I would also like to mention that i stumbled upon this [Video] on Azure in a nutshell, great watch if you are new to Windows Azure. In the next post I intend to start setting up the Load Test Environment and discuss pricing with respect to test agent machine types that will be used in the test rig. Hope you enjoyed this post, If you have any recommendations on things that I should consider or any questions or feedback, feel free to add to this blog post. Remember to subscribe to http://feeds.feedburner.com/TarunArora. See you in Part II. Share this post : CodeProject

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Dependency injection: Scoping by region (Guice, Spring, Whatever)

- by Itay

Here's a simplified version of my needs. I have a program where every B object has its own C and D object, injected through Guice. In addition an A object is injected into every C and D objects. What I want: that for each B object, its C and D objects will be injected with the same A object. Specifically, I want the output of the program (below) to be: Created C0 with [A0] Created D0 with [A0] Created B0 with [C0, D0] Created C1 with [A1] Created D1 with [A1] Created B1 with [C1, D1] Where it currently produces the following output: Created C0 with [A0] Created D0 with [A1] <-- Should be A0 Created B0 with [C0, D0] Created C1 with [A2] <-- Should be A1 Created D1 with [A3] <-- Should be A1 Created B1 with [C1, D1] I am expecting DI containers to allow this kind of customization but so far I had no luck in finding a solution. Below is my Guice-based code, but a Spring-based (or other DI containers-based) solution is welcome. import java.util.Arrays; import com.google.inject.*; public class Main { public static class Super { private static Map<Class<?>,Integer> map = new HashMap<Class<?>,Integer>(); private Integer value; public Super(Object... args) { value = map.get(getClass()); value = value == null ? 0 : ++value; map.put(getClass(), value); if(args.length > 0) System.out.println("Created " + this + " with " + Arrays.toString(args)); } @Override public final String toString() { return "" + getClass().getSimpleName().charAt(0) + value; } } public interface A { } public static class AImpl extends Super implements A { } public interface B { } public static class BImpl extends Super implements B { @Inject public BImpl(C c, D d) { super(c,d); } } public interface C { } public static class CImpl extends Super implements C { @Inject public CImpl(A a) { super(a); } } public interface D { } public static class DImpl extends Super implements D { @Inject public DImpl(A a) { super(a); } } public static class MyModule extends AbstractModule { @Override protected void configure() { bind(A.class).to(AImpl.class); bind(B.class).to(BImpl.class); bind(C.class).to(CImpl.class); bind(D.class).to(DImpl.class); } } public static void main(String[] args) { Injector inj = Guice.createInjector(new MyModule()); inj.getInstance(B.class); inj.getInstance(B.class); } }

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Using automated bdd-gui-tests to keep user-documentation-screenshots up do date?

- by k3b

Are there developpers out there, who (ab)use the CaptureScreenshot() function of their automated gui-tests to also create uptodate-screenshots for the userdocumentation? Background: Whithin the lifetime of an application, its gui-elements are constantly changing. It makes a lot of work to keep the userdocumentation uptodate, especially if the example data in the pictures should match the textual description. If you already have automated bdd-gui-tests why not let them take screenshots at certain points? I am currently playing with webapps in dotnet+specflow+selenium, but this topic also applies to other bdd-engines (JRuby-Cucumber, mspec, rspec, ...) and gui-test-Frameworks (WaitN, WaitR, MsWhite, ....) Any experience, thoughts or url-links to this topic would be helpfull. How is the cost/benefit relation? Is it worth the efford? What are the Drawbacks? See also: Is it practical to retroactively write specifications documenting a system via automated acceptance tests?

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Console-like control that allows full control over individual text formatting

- by Rich.Carpenter

I'm tinkering with writing a simple text-based role-playing game. I would like to use WinForms, and utilize WinForm controls for the UI and simple text for the output. The catch is, I would like to have complete control over the formatting of the individual text - some words being different colors, etc. A simple console control would suffice, as that would provide control over text colors, but it would be nice to also be able to change style, font and size. Less important: it would be nice to have complete control over where text appears in the control through a coordinate system, as with DOS windows of old. I'd appreciate suggestions on the best method of implementing this. Perhaps there is a better method I had not considered for rendering the output of a text-based game.

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Are There Realistic/Useful Solutions for Source Control for Ladder Logic Programs

- by Steven A. Lowe

Version control for ladder logic (LL) programs for programmable logic controllers (PLCs) seems to be virtually non-existent. It may be because LL is a visual language and tends to be stored in binary files, or it may be because source code control hasn't "caught on" in process control engineering circles - or perhaps my Google-Fu is weak tonight. Do you know of any realistic and useful solutions for version control for such systems? Definitions: realistic = changes to the programs are tracked by user and subject to reversion and merges useful = the system integrates with visual LL designers, is not limited to LL from a single PLC manufacturer, and does not cost a ridiculous amount of money? Note: I have heard of people using SVN or Mercurial et al to track the binary files, but I don't think the diff/merge capabilities would display readable differences.

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