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• Porting Java app to Go - any advice?

  - by Devrim

  We want to rewrite kodingen.com backend with Go which currently is Java, running as daemon using jsvc. I have never touched any C in my life, am only experienced in Java so I don't know if this is something that I should even start. However, task is pretty simple read shell commands from mysql database queue and execute them in parallel save each shell output to the database that's it. So these simple requirements gives me hope that I can start using this wonderful language. What would you advise?

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• Coding Standards

  - by kevchadders

  For those of us that have programmed enough I’m sure we have come across many different flavours of coding standards that you can use when it comes to programming. e.g. http://msdn.microsoft.com/en-us/library/ms229042.aspx You might derive your coding standards for the current company you work for or from the original author of the code you’re working on. Coding styles are often used for specific program languages and some styles in one coding language might not be considered appropriate for others. Of course some coding standards can be applied across many different program languages. My question is do you have any good advice/links yourselves to a set of coding standards that you would recommend to others, or best practices to follow? Thank you for your time. EDIT: As we know there are many related articles on this subject, but C# Coding standard / Best practices in SO has some very useful links in there which is worth a visit. (Check out the 2 links on .NET/C# guidelines by ESV - Accepted Answer)

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• sproutcore or cappucino for web app development?

  - by swami

  I recently found out about the sproutcore and capuccino frameworks for web app development as proper MVC approach to creating Desktop-like applications. As far as I could understand, the main difference between the two frameworks is that Cappucino abstracts away the HTML+CSS+Javascript to Objective-J - a new programming language developed be the creators of Capuccino that adds OO capabilities to Javascript, whereas Sproutcore uses HTML5,CSS,Javascript. After lots of pondering, I thought it's probably best to go with technologies we know, so I downloaded the Sproutcore tools and did the tutorials, and I have to say I was very impressed. Just the kind of thing I was looking for, for organizing a complex web app. However, I just stumbled across the following link: http://charlesjolley.sys-con.com/node/1341228 in which Charles Jolley (the creator of Sproutcore) syas that he's tired of waiting for the HTML5 and ECMAScript5 specs to get finalized, and announces that from version 1.1 onwards they will be switching to Objective-J ! So now the question is - what will actually differentiate Sproutcore and Capuccino - and which one should I choose now? Kind Regards Swami

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• Virtual Function Implementation

  - by Gokul

  Hi, I have kept hearing this statement. Switch..Case is Evil for code maintenance, but it provides better performance(since compiler can inline stuffs etc..). Virtual functions are very good for code maintenance, but they incur a performance penalty of two pointer indirections. Say i have a base class with 2 subclasses(X and Y) and one virtual function, so there will be two virtual tables. The object has a pointer, based on which it will choose a virtual table. So for the compiler, it is more like switch( object's function ptr ) { case 0x....: X->call(); break; case 0x....: Y->call(); }; So why should virtual function cost more, if it can get implemented this way, as the compiler can do the same in-lining and other stuff here. Or explain me, why is it decided not to implement the virtual function execution in this way? Thanks, Gokul.

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• A compiler for automata theory

  - by saadtaame

  I'm designing a programming language for automata theory. My goal is to allow programmers to use machines (DFA, NFA, etc...) as units in expressions. I'm confused whether the language should be compiled, interpreted, or jit-compiled! My intuition is that compilation is a good choice, for some operations might take too much time (converting NFA's to equivalent DFA's can be expensive). Translating to x86 seems good. There is one issue however: I want the user to be able to plot machines. Any ideas?

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• How to setup directories in Visual Studio when using boost?

  - by Rich

  Hi, I have introduced boost to our code base, on my machine I created a boost directory called Thirdparty.Boost and added that as an additional include directory in my Visual Studio setting, all is fine. However I now want to check in my changes, so the rest of the team can get them. Inorder to build the code they would need to setup boost as I have (problem number 1). In addition we have a build server, which will need changing (problem 2). I have a way of distributing boost to everyone including the build server, so that's not a problem I need a way of referring to the boost directory without changing the default settings in Visual Studio. Why don't you change it on a project level I hear you cry? The solution has over 200 projects, which would require a lot of changes. I just wondered if there was another way? Cheers Rich

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• Convert wife/husband/partner to a programmer.

  - by Stefan

  originally posted by Stefan: How many of you have had the thought of educate your partner and invite him/her to the beautiful world of programming? I once started to give my wife lessons twice a week, It was a competition between me and another programmer, we thought it would be nice to have our wives understand why we work as programmers and also have it as a hobby sitting all night long. Maybe we could get our wives to feel the power too? After a couple of months my wife didn't like the idea any more, it was too hard to understand she thought, same for my friends wife. So now we are thinking of some project that would be too fun for our wives to turn down just to get the spirit up again. It would be nice to hand over a project to my wife, "Can you debug this for me, please? There are some strange error on module xxx." :) Maybe I'm crazy, what do you think?

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• NHibernate: uninitialized proxy passed to save() and cascade

  - by jonnii

  Hi, I keep getting an NHibernate.PersistentObjectException when calling session.Save() which is due to an uninitialized proxy passed to save(). If I fiddle with my cascade settings I can make it go away, but then child objects aren't being saved. The only other fix I have found is by adding the following to my DefaultSaveEventListener. protected override bool ReassociateIfUninitializedProxy(object obj, global::NHibernate.Engine.ISessionImplementor source) { if (!NHibernateUtil.IsInitialized(obj)) NHibernateUtil.Initialize(obj); return base.ReassociateIfUninitializedProxy(obj, source); } This is obviously not an ideal solution. Any ideas?

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• Some questions about setting up Amazon S3 with Ruby on Rails

  - by ben

  I'm trying to setup Amazon S3 hosting with my Ruby on Rails 3 app, which is hosted on Heroku. After reading these instructions in the Heroku docs, I'm trying to use the aws-s3 gem. The instructions say to put the S3 account details in config/amazon_s3.yml, but the aws-s3 Github page says you create a connection like this: AWS::S3::Base.establish_connection!( :access_key_id => 'abc', :secret_access_key => '123' ) Why is the connection created by providing the details if they're already provided in the config file? Is that not the correct way to establish a connection? Do I have to establish a connection for each user everytime an upload is about to occur, or is a connection established for the application as a whole? Thanks for reading.

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• Attaching HTML file as email in VB 6.0

  - by Shax

  Hi, I am trying to attach an html file file to email using Visual Basic 6.0. when the cursor is comes on Open strFile For Binary Access Read As #hFile line it gives error "Error encoding file - Bad file name or number". Please all your help and support would be highly appreciated. Dim handleFile As Integer Dim strValue As String Dim lEventCtr As Long handleFile = FreeFile Open strFile For Binary Access Read As #handleFile Do While Not EOF(hFile) ' read & Base 64 encode a line of characters strValue = Input(57, #handleFile) SendCommand EncodeBase64String(strValue) & vbCrLf ' DoEvents (occasionally) lEventCtr = lEventCtr + 1 If lEventCtr Mod 50 = 0 Then DoEvents Loop Close #handleFile Exit Sub File_Error: Close #handleFile m_ErrorDesc = "Error encoding file - " & Err.Description Err.Raise Err.Number, Err.Source, m_ErrorDesc End Sub

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• How to apply coding methodologies and practices to non-coding work?

  - by Dan

  I can talk for hours about best-practice, source control, change management, feature tracking, development cycles and the lot, but most of what I've learnt or read seems to apply to nuts-and-bolts programming of compiled applications. You know, ASCII files that gets turned into 1s and 0s. How does one apply the same discipline and wisdom to working in environments that are point-and-click, config-centric. I'm thinking of CMSs and specifically, my current 9 to 5, SharePoint. Traditional practices of source control, dev-staging-production seem to break down since we're not working with code, and the live environment changes with user input. So to sum up a rather lengthy question, what works in a no-code environment?

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• Adobe After Effects Plugin With Cocoa (Overriding malloc)

  - by mustISignUp

  Messing about a bit, i have a working Adobe After Effects plugin with a bit of Obj-c / Cocoa in it (NSArray and custom objects - not ui stuff). The SDK guide states:- Always use After Effects memory allocation functions. In low-memory conditions (such as during RAM preview), it’s very important that plug-ins not compete with After Effects for OS memory, and deal gracefully with out-of-memory conditions. Failing to use our functions can cause lock-ups, crashes, and tech support calls. Don’t do that. If you’re wrapping existing C++ code, overloading new and delete to use our functions will save substantial reimplementation. On Windows, derive all classes from a common base class which implements new and delete. so my question.. is something compatible with the above statement possible in Obj-c?

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• How are binding specified for Interface Builder plugins?

  - by Benedict Cohen

  I'm creating an Interface Builder plugin for an NSView subclass. I've been following the Interface Builder Plug-in Programming Guide but it's not answer all my questions. My class has one NSString property and 4 NSColor properties which I want to create bindings for at design time. I can't figure out where the bindings are specified in the plugin project. The documentation states that the Inspector Object is only for creating the Attribute Inspector. The class description file (.classdescription) lists outlets and actions but not bindings. Where do I specify the bindings for my class?

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• SQL Server 2008 automated database drop, create and fill

  - by lox

  For the database in my project I have a drop/create script for the database, a script for creating tables and SPs and an Access 2003 .mdb file with some exported values. To set up the database from scratch I can use my SQL management studio to first run one script, then the other and lastly manually run the sort of tedious import task. But I would like to do this as automated as possible. Hopefully something like putting the three files in a folder along with a fourth script to execute. Looking something like: run script "dropcreate.sql" run script "createtables.sql" import "values.mdb" How is this done? I hope to avoid using SSIS and the like. The tricky this is of course the import of data, where I can't seem to find a simple way. It is also important that the files a left as they are and not embedded into anything.

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• Architectural decision : QT or Eclipse Platform ?

  - by umanga

  We are in the process of designing a tool to be used with HDEM(High Definition Electron Microscope).We get stacks of 2D images from HDEM and first step is 'detecting borders' on the sections.After detecting edges of 2D slices ,next step is construct the 3D model using these 2D slices. This 'border detecting' algorithm(s) is/are implemented by one of professor and he has used and suggests to use C.(to gain high performance and probably will parallelise in future) We have to develop comprehensive UI ,3D viewer ,2D editor...etc and use this algorithm. Application should support usual features like project save/open.Undo,Redo...etc Our technology decisions are: A) Build entire platform from the scratch using QT. B) Use Eclipse Platform Our concerns are, if we choose A) we can easily integrate the 'border detecting' algorithm(s) because the development environment is C/C++ But we have to implement the basic features from the scratch. If we choose B) we get basic features from the Eclipse platform , but integrating C libraries going to be a tedious task. Any suggestions on this?

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• Android material L image transition interpolator

  - by Diolor

  This is more of a mathematics question rather than programming. Well, I would like to ask id you know what is the interpolator described in Material design: It looks to be an AccelerateDecelerateInterpolator but the deceleration effect decays slower. My best hatch is : public class MaterialInterpolator implements Interpolator { @Override public float getInterpolation(float input) { if(input<1./3f) return new AccelerateInterpolator().getInterpolation(input); else return new DecelerateInterpolator().getInterpolation(input); } } Which creates a gap between the values: Time / Value 0.3,0.09 0.317,0.100489 0.333,0.110889 <-- gap 0.35,0.57750005 0.367,0.599311 0.383,0.61931103 0.4,0.64 Source: http://www.google.com/design/spec/patterns/imagery-treatment.html

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• TextBox.TextChanged & ICommandSource

  - by Brad Leach

  I am following the M-V-VM pattern for my WPF UI. I would like to hook up a command to the TextChanged event of a TextBox to a command that is in my ViewModel class. The only way I can conceive of completing this task is to inherit from the TextBox control, and implement ICommandSource. I can then instruct the command to be fired from the TextChanged event. This seems to be too much work for something which appears to be so simple. Is there an easier way (than subclassing the TextBox and implementing ICommandSource) to hook up the TextChanged event to my ViewModel class?

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• What fields have job security?

  - by computergeek6

  I can program pretty well, and I'm trying to think of a programming area that I can practice so I have a better chance of getting a job when I finish my education. I'm currently learning game development, but there are a ton of other people trying to get into game dev, so I want to find something a little more secure and sustainable to develop skills in. I've thought of things like financial systems and engineering stuff, but nothing I can think of is accessible to someone in high school. I'm trying to find something that involves physics or networking and isn't as popular a field as game dev. Does anyone have any ideas?

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• Convert mediawiki to LaTeX syntax

  - by Amit Kumar

  I need to convert mediawiki into LaTeX syntax. The formulas should stay the same, but I need to transform, for example = something = into \chapter{something}. Although this can be obtained with a bit of sed, things get a little dirty with the itemize environment, so I was wondering if a better solution can be produced. Anything that can be useful for this task ? This is the reverse of this question (graciously copied). Pandoc was the answer to that question, but probably not yet for this.

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• Any way of working with Eclipse WTP that does not mean redeploying the _WHOLE_ application when a J

  - by Thorbjørn Ravn Andersen

  I have migrated a Web Application from MyEclipse to Eclipse WTP, and I am now in the middle of the first major upgrade to the code base and web pages after the migration, and it is frankly driving me mad that saving a JSP page causes a redeployment of the WHOLE application, as it takes time and that my backend connection does not survive the serialization-deserialization of the session object (which is non-trivial to fix). In addition to that the JSP-editor is insanely slow so I frequently have to pause to let the editor catch up to be certain where my edits go in a small JSP using JavaServer Faces. Disabling validation did not help. The Eclipse Dynamic Web Project depends on several library eclipse projects so I cannot just tell e.g. Jetty to use the WebRoot folder, as several dependencies are then missing from the classpath. The question is: Is there a way of working - ANY way of working - with the Eclipse WTP system that does NOT imply redeploying everything every time any file is saved? I can use Tomcat 5.5 or Jetty 6 as servers.

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• Java - Creating a Compiler Help

  - by Brian

  So for my programming class we have had a project to create a virtual machine including a memory unit, cpu, Input, Output, Instruction Register, Program Counter, MAR, MDR and so on. Now we need to create a compiler using Java Code that will take a .exe file written in some txt editor and convert it to java byte code and run the code. The code we will be writing in the .exe file is machine code along the lines of: IN X IN Y ADD X STO Y OUT Y STOP DC X 0 DC Y 0 I am just a beginner and only have 2 days to write this and am very lost and have no idea where to start....Any Help will be much appreciated. Thanks

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• Rails - Vestal Versions - Access previous version data w/o restoring?

  - by AnApprentice

  Hello, I'd like to use vestal versions to do the following: Determine the Content of the current record being saved Determine the Content of the last record saved In my model I have: class Note < ActiveRecord::Base versioned :if => :really_create_a_version? def really_create_a_version? XXXXXXXXXXXXXX XXXXXXXXXXXXXX end end Where the XXXX are, how can I get the note.content of the item about to be saved (i'm assuming it hasn't been saved yet to the DB? Is that correct? Also, how can I get the note.content of the save before the current save in progress? Thanks

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• git hooks - regenerate a file and add it to each commit ?

  - by egarcia

  I'd like to automatically generate a file and add it to a commit if it has changed. Is it possible, if so, what hooks should I use? Context: I'm programming a CSS library. It has several CSS files, and at the end I want to produce a compacted and minimized version. Right now my workflow is: Modify the css files x.css and y.css git add x.css y.css Execute minimize.sh which parses all the css files on my lib, minimizes them and produces a min.css file git add min.css git commit -m 'modified x and y doing foo and bar' I would like to have steps 3 and 4 done automatically via a git hook. Is that possible? I've never used git hooks before. After reading the man page, I think I need to use the @pre-commit@ hook. But can I invoke git add min.css, or will I break the internet?

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• how to call different Win API based on Windows version?

  - by liuliu

  The specific problem is, the support of condition variable on Windows begins from Vista, for early version of Windows (Windows XP), I have a emulated condition variable code sort of solved the problem. However, I'd like to have the ability to call native condition variable API when the system supported and fallback to my version only on XP and earlier version. I tried to detect windows version with GetVersionInfo API, but it still gives me error on start time (cannot find API entry of InitializeConditionVariable sort of). I am not familiar with Windows programming, how do you solve the gentle fallback problem nicely?

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• Excel Matching problem with logic expression

  - by abelenky

  (I understand Excel is only borderline programming) I have a block of data that represents the steps in a process and the possible errors: ProcessStep Status FeesPaid OK FormRecvd OK RoleAssigned OK CheckedIn Not Checked In. ReadyToStart Not Ready for Start I want to find the first Status that is not "OK". I have attempted this: =Match("<>""OK""", StatusRange, 0) which is supposed to return the index of the first element in the range that is NOT-EQUAL (<) to "OK" But this doesn't work, instead returning #N/A. I expect it to return 4 (index #4, in a 1-based index, representing that CheckedIn is the first non-OK element) Any ideas how to do this?

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