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• Default Parameter in .NET 4(C#)

  - by Yousef_Jadallah

  During my using for the new release .NET 4, I notice that C# support default (Optional) Parameters, after thousands of complains form C# programmer- especially it was supported by VB.NET- now it's available. Let's create Test function with Optional Parameter   private void TestFunction(string para1, string para2 = "Default") { Response.Write("Parameter one =" + para1 +" , Parameter two="+ para2 ); } Then, if you try to call this method the Intellisense display likes this:   .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; }   Therefore,if you don’t pass the second parameter the value of para2 will be “Default”. With this new future in C#, you can ignore many overload functions event it was acceptable solution!

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• Is it possible to extract textures or sprites from compiled game files?

  - by Brian Reindel

  For instance, every map in Portal has what appear to be sprites over a texture indicating the obstacles you'll face (see screenshot). Are these resources compiled into the source as byte code, or is it possible to extract them from installation files? Obviously I understand copyright implications, and I am only interested in using it for a recreational project. Instead of recreating them, I wonder if they can be extracted.

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• How important do you find exception safety to be in your C++ code?

  - by Kai

  Every time I consider making my code strongly exception safe, I justify not doing it because it would be so time consuming. Consider this relatively simple snippet: Level::Entity* entity = new Level::Entity(); entity->id = GetNextId(); entity->AddComponent(new Component::Position(x, y)); entity->AddComponent(new Component::Movement()); entity->AddComponent(new Component::Render()); allEntities.push_back(entity); // std::vector entityById[entity->id] = entity; // std::map return entity; To implement a basic exception guarantee, I could use a scoped pointer on the new calls. This would prevent memory leaks if any of the calls were to throw an exception. However, let's say I want to implement a strong exception guarantee. At the least, I would need to implement a shared pointer for my containers (I'm not using Boost), a nothrow Entity::Swap for adding the components atomically, and some sort of idiom for atomically adding to both the Vector and Map. Not only would these be time consuming to implement, but they would be expensive since it involves a lot more copying than the exception unsafe solution. Ultimately, it feels to me like that time spent doing all of that wouldn't be justified just so that the a simple CreateEntity function is strongly exception safe. I probably just want the game to display an error and close at that point anyway. How far do you take this in your own game projects? Is it generally acceptable to write exception unsafe code for a program that can just crash when there is an exception?

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• Finding complexity of a program as a service [on hold]

  - by Seshu

  I would like to find the complexity of a specific code chunk written in Java. Is there a place/web site/service where I can find out the complexity of any arbitrary program. This program might include loops/recursion. Using theory we can compute complexity ourselves. But, just curious in finding if any service is out there to find such complexity. We have several code quality related tools does any of such tools will also find complexity of given code? Could any one point me or direct me to such a utility/site/service?

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• How to recover from finite-state-machine breakdown?

  - by Earl Grey

  My question may seems very scientific but I think it's a common problem and seasoned developers and programmers hopefully will have some advice to avoid the problem I mention in title. Btw., what I describe bellow is a real problem I am trying to proactively solve in my iOS project, I want to avoid it at all cost. By finite state machine I mean this I have a UI with a few buttons, several session states relevant to that UI and what this UI represents, I have some data which values are partly displayed in the UI, I receive and handle some external triggers (represented by callbacks from sensors). I made state diagrams to better map the relevant scenarios that are desirable and alowable in that UI and application. As I slowly implement the code, the app starts to behave more and more like it should. However, I am not very confident that it is robust enough. My doubts come from watching my own thinking and implementation process as it goes. I was confident that I had everything covered, but it was enough to make a few brute tests in the UI and I quickly realized that there are still gaps in the behavior ..I patched them. However, as each component depends and behaves based on input from some other component, a certain input from user or some external source trigers a chain of events, state changes..etc. I have several components and each behave like this Trigger received on input - trigger and its sender analyzed - output something (a message, a state change) based on analysis The problem is, this is not completely selfcontained, and my components (a database item, a session state, some button's state)...COULD be changed, influenced, deleted, or otherwise modified, outside the scope of the event-chain or desirable scenario. (phone crashes, battery is empty phone turn of suddenly) This will introduce a nonvalid situation into the system, from which the system potentially COULD NOT BE ABLE to recover. I see this (althought people do not realize this is the problem) in many of my competitors apps that are on apple store, customers write things like this "I added three documents, and after going there and there, i cannot open them, even if a see them." or "I recorded videos everyday, but after recording a too log video, I cannot turn of captions on them.., and the button for captions doesn't work".. These are just shortened examples, customers often describe it in more detail..from the descriptions and behavior described in them, I assume that the particular app has a FSM breakdown. So the ultimate question is how can I avoid this, and how to protect the system from blocking itself? EDIT I am talking in the context of one viewcontroller's view on the phone, I mean one part of the application. I Understand the MVC pattern, I have separate modules for distinct functionality..everything I describe is relevant to one canvas on the UI.

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• Where's Randall Hyde?

  - by user1124893

  This probably doesn't belong here, but I couldn't think of any other StackExchange site that would fit it. Quick question, what ever happened to Randall Hyde, author of The Art of Assembly, HLA, and other works? I ask this because I was just exploring some of the content on his website and a lot of it is now gone. His website was hosted on Apple's MobileMe. As of the writing of this question, Apple has closed off all MobileMe content a few days ago. Correct me if I'm wrong, but didn't Apple warn of this a year in advance? If so, then where's Randall Hyde? Come to think of it, all of the content on his website that I have seen is several years old. A lot of it is rather useful but unfinished.

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• Is there an IDE that can simplify the process of creating a game matchmaking website?

  - by Scott

  Yes, I'm an old guy. And I'm well versed in "C" and have written several games which I have been selling on the web for a number of years. And now, I would like to adapt one of my games to be "online". Sounds simple. I'm sure I can use the thousands of lines of "C" code that I've already written. Right? So my initial investigation begins. First, I think I'll need a server program that lives on a dedicated server (or a VPS probably) that talks to a bunch of client applications that live on individual devices around the world. I can certainly handle that! (I think to myself). I'll break up my existing game into two pieces, a client piece that is just the game displays and buttons, and a server piece that does everything else. Piece of cake, right? But that means that the "server piece" must be executed on a remote machine somewhere and run 24/7. Can I do that? [apparently, that question is so basic, so uneducated, and so lame, that nobody has ever posed it before. Because hours of Googling does not yield an answer. Fine. I'll assume I can do that and move on.] I'll need a "game room", which to me means a website where you log in and then go to a lobby of some kind where you can setup your preferences, see if any of your friends are connected, and create or join games. Should be easy, but it's not. No way. Can I do all this with my local website builder? (which happens to be 90 Second Website Builder, a nice product, btw). It turns out, I can not. I can start with that, but must modify each page, so I can interact with my sql database. So I begin making each page a "PHP" page and dynamically modifying the HTML code with PHP code. I'm already starting to get a headache. Because the resulting web pages looked terrible, I began looking at using JQuery. I want to user a JQuery dialog on my website to display a list of friends and allow the user to select one to invite to the game. [google search for "how to populate a JQuery dialog from a sql database" yields nothing but more confusion.] Javascript? Java? HTML? XML? HTML5? PHP? JQuery? Flash? Sockets? Forms? CSS? Learning about each one of these, and how they interact with each other and/or depend on each other is too much for my feeble old brain. Can anyone simplify this process for me? Is there an IDE that will help me do all this without having to go back to college for a few years? Thanks, Scott

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• Is it appropriate for a class to only be a collection of information with no logic?

  - by qegal

  Say I have a class Person that has instance variables age, weight, and height, and another class Fruit that has instance variables sugarContent and texture. The Person class has no methods save setters and getters, while the Fruit class has both setters and getters and logic methods like calculateSweetness. Is the Fruit class the type of class that is better practice than the Person class. What I mean by this is that the Person class seems like it doesn't have much purpose; it exists solely to organize data, while the Fruit class organizes data and actually contains methods for logic.

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• Should experienced programmers know database queries?

  - by Shamim Hafiz

  There are so many programmers out there who are also an expert at Query writing and Database design. Should this be a core requirement to be an expert programmer or software engineer? Though there are lots of similarities in the way queries and codes are developed, my personal opinion is, Queries seem to have a different Structure than Code and it can be tough to Master both simultaneously due to the different approaches.

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• Should I be an algorithm developer, or java web frameworks type developer?

  - by Derek

  So - as I see it, there are really two kinds of developers. Those that do frameworks, web services, pretty-making front ends, etc etc. Then there are developers that write the algorithms that solve the problem. That is, unless the problem is "display this raw data in some meaningful way." In that case, the framework/web developer guy might be doing both jobs. So my basic problem is this. I have been an algorithms kind of software developer for a few years now. I double majored in Math and Computer science, and I have a master's in systems engineering. I have never done any web-dev work, with the exception of a couple minor jobs, and some hobby level stuff. I have been job interviewing lately, and this is what happens: Job is listed as "programmer- 5 years of experience with the following: C/C++, Java,Perl, Ruby, ant, blah blah blah" Recruiter calls me, says they want me to come in for interview In the interview, find out they have some webservices development, blah blah blah When asked in the interview, talk about my experience doing algorithms, optimization, blah blah..but very willing to learn new languages, frameworks, etc Get a call back saying "we didn't think you were a fit for the job you interviewed wtih, but our algorithm team got wind of you and wants to bring you on" This has happened to me a couple times now - see a vague-ish job description looking for a "programmer" Go in, find out they are doing some sort of web-based tool, maybe with some hardcore algorithms running in the background. interview with people for the web-based tool, but get an offer from the algorithms people. So the question is - which job is the better job? I basically just want to get a wide berth of experience at this level of my career, but are algorithm developers so much in demand? Even more so than all these supposed hot in demand web developer guys? Will I be ok in the long run if I go into the niche of math based algorithm development, and just little to no, or hobby level web-dev experience? I basically just don't want to pigeon hole myself this early. My salary is already starting to get pretty high - and I can see a company later on saying "we really need a web developer, but we'll hire this 50k/year college guy, instead of this 100k/year experience algorithm guy" Cliffs notes: I have been doing algorithm development. I consider myself to be a "good programmer." I would have no problem picking up web technologies and those sorts of frameworks. During job interviews, I keep getting "we think you've got a good skillset - talk to our algorithm team" instead of wanting me to learn new skills on the job to do their web services or whhatever other new technology they are doing. Edit: Whenever I am talking about algorithm development here - I am talking about the code that produces the answer. Typically I think of more math-based algorithms: solving a financial problem, solving a finite element method, image processing, etc

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• Aggregating Excel cell contents that match a label [migrated]

  - by Josh

  I'm sure this isn't a terribly difficult thing, but it's not the type of question that easily lends itself to internet searches. I've been assigned a project for work involving a complex spreadsheet. I've done the usual =SUM and other basic Excel formulas, and I've got enough coding background that I'm able to at least fudge my way through VBA, but I'm not certain how to proceed with one part of the task. Simple version: On Sheet 1 I have a list of people (one on each row, person's name in column A), on sheet 2 I have a list of groups (one on each row, group name in column A). Each name in Sheet 1 has its own row, and I have a "Data Validation" dropdown menu where you choose the group each person belongs to. That dropdown is sourced from Sheet 2, where each group has a row. So essentially the data validation source for Sheet 1's "Group" column is just "=Sheet2!$a1:a100" or whatever. The problem is this: I want each group row in Sheet 2 to have a formula which results in a list of all the users which have been assigned to that group on Sheet 1. What I mean is something the equivalent of "select * from PeopleTab where GROUP = ThisGroup". The resulting cell would just stick the names together like "Bob Smith, Joe Jones, Sally Sanderson" I've been Googling for hours but I can't think of a way to phrase my search query to get the results I want. Here's an example of desired result (Dash-delimited. Can't find a way to make it look nice, table tags don't seem to work here): (Sheet 1) Bob Smith - Group 1 (selected from dropdown) Joe Jones - Group 2 (selected from dropdown) Sally Sanderson - Group 1 (selected from dropdown) (Sheet 2) Group 1 - Bob Smith, Sally Sanderson (result of formula) Group 2 - Joe Jones (result of formula) What formula (or even what function) do I use on that second column of sheet 2 to make a flat list out of the members of that group?

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• how can i prepare myself to become game developer

  - by gowri

  I like to become game developer.. i already worked as web developer for past 1 year . there i used php ,jquery,mysql and some frame work also .It's little boring now same thing again and again .So i start to learn android application development . my question is : if want to become a game developer what skills should i have (like java,c++,etc) ? Where can i get good tutorials(online) ? is previous knowledge will help me ? Please clarify me !

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• How do I improve my code reading skills

  - by Andrew

  Well the question is in the title - how do I improve my code reading skills. The software/hardware environment I currently do development in is quite slow with respect to compilation times and time it takes the whole system to test. The system is quite old/complex and thus splitting it into a several smaller, more manageable sub-projects is not feasible in a neare future. I have realized is what really hinders the development progress is my code reading skills. How do I improve my code reading skills, so I can spot most of the errors and issues in the code even before I hit the "do compile" key, even before I start the debugger?

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• Any good, easy to learn from books or tutorials for learning assembly? [on hold]

  - by pythonian29033

  I've been a developer since 2009 and I've learnt a lot of languages since, but I've always wanted to understand and be able to code in the lowest level language so I can directly (or at least very close to directly) speak to machines through my code. There was a point in time when someone showed me how to do an if statement in assembly, but out of all the books that I got, I could never really understand where/how to start learning to code in assembler. any help please? I'm obsessed with learning this! PS: if you have any software suggestions, I use ubuntu and am looking to convert to backtrack soon, so it would be preferred if you could give me something that'll be easily installed on debian linux, otherwise don't sweat it, give me the name of the windows software and I'll find an equivalent myself

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• Which computer side has more salary chance in future programmer , sys admin , network admin , web developer

  - by Name

  I want to know which computer field has more probability of getting high salary with experience in the following fields 1)Programmer c , c++ , java 2)Sys admin MIcrosoft . linux 3)Network admin (Cisco ccna ccnp 4)web developer Any more idea will be good i work as web developer for 3 years and stiing at 40K$. I have to find new job and still look like i don't have offer more than 50K. may be i have chosen the wrong path. My friend in network admin has started from 65K and with experince he is going the ccnp or ccie with more high packages. I may e wrong , please correct me

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• What is the best way to store anciliary data with a 2D timeseries object in R?

  - by Mike52

  I currently try to move from matlab to R. I have 2D measurements, consisting of irradiance in time and wavelength together with quality flags and uncertainty and error estimates. In Matlab I extended the timeseries object to store both the wavelength array and the auxiliary data. What is the best way in R to store this data? Ideally I would like this data to be stored together such that e.g. window(...) keeps all data synchronized.

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• How to handle concurrency in Entity Framework

  - by nikolaosk

  This is going to be the fifth post of a series of posts regarding ASP.Net and the Entity Framework and how we can use Entity Framework to access our datastore. You can find the first one here , the second one here and the third one here . You can read the fourth one here . I have a post regarding ASP.Net and EntityDataSource. You can read it here .I have 3 more posts on Profiling Entity Framework applications. You can have a look at them here , here and here . In this post I will be looking into...(read more)

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• What simple game is good to learn OO principles?

  - by Bogdan Gavril

  I have to come up with a project propsal for my students, here are some details: The design should be gove over OO concepts: encapsulation, interfaces, inheritance, abstract classes Idealy a game, to keep interest high No GUI, just the console Effective time to finish this: ~ 6 days (1 person per proj) I have found one nice example of a game with carnivore and herbivore cells in a drop of water (array), it's a game of life twist. It is a bit too simple. Any ideeas? Aditional info: - language is C#

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• March 2010 Meeting of Israel Dot Net Developers User Group (IDNDUG)

  - by Jackie Goldstein

  Note the special date of this meeting - Wednesday March 24, 2010 For our March 2010 meeting of the Israel Dot Net Developers User Group we have the opportunity for a special meeting with Brad Abrams from Microsoft Corp, who will in Israel for the Developer Academy 4 event. Our user group meeting will be held on Wednesday March 24, 2010 .   This meeting will focus on building Line of Business applications with Silverlight 4, RIA Services and VS2010. Abstract: Building Business Applications...(read more)

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• Your experience with haxe and other languages that compile to PHP?

  - by Kim

  I would like to hear oppinions from people who have used a language that compiles to php. One such language I know is Haxe. Other ones I've read about are Kira and Pharen. How well do these languages integrate with PHP? Is it relatively easy to write a plugin for a PHP CMS in them? How mature are their implementations and tools? Would you recommend them to someone who has to use a php cms but hates php?

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• Relaunch: Help & Support Center

  - by Axinom

  More content, more interactivity, more social media: new help & support center for AxCMS.net collects all available information and news around AxCMS.net installation, deployment, development, and usage. Web: http://help.axcms.net/ Free download: http://www.AxCMS.net New chapter "Basic Concepts" is designed to provide users with an introduction and understanding of AxCMS.net. You will be introduced to the different AxCMS.net components, elements, use of built-in features such as categories and relations, deployment, workflow and security topics. This information forms a self-study guide as an introduction to AxCMS.net

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• When and why you should use void (instead of i.e. bool/int)

  - by Jonas

  I occasionally run into methods where a developer chose to return something which isn't critical to the function. I mean, when looking at the code, it apparently works just as nice as a void and after a moment of thought, I ask "Why?" Does this sound familiar? Sometimes I would agree that most often it is better to return something like a bool or int, rather then just do a void. I'm not sure though, in the big picture, about the pros and cons. Depending on situation, returning an int can make the caller aware of the amount of rows or objects affected by the method (e.g., 5 records saved to MSSQL). If a method like "InsertSomething" returns a boolean, I can have the method designed to return true if success, else false. The caller can choose to act or not on that information. On the other hand, May it lead to a less clear purpose of a method call? Bad coding often forces me to double-check the method content. If it returns something, it tells you that the method is of a type you have to do something with the returned result. Another issue would be, if the method implementation is unknown to you, what did the developer decide to return that isn't function critical? Of course you can comment it. The return value has to be processed, when the processing could be ended at the closing bracket of method. What happens under the hood? Did the called method get false because of a thrown error? Or did it return false due to the evaluated result? What are your experiences with this? How would you act on this?

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• How to know which fields of a record are updated in saving the edit? [closed]

  - by Luiz Maffort

  I'm recording in a log table all that is changed in a given table, so this need to know when for example the User to change the status from active to inactive. With this information I will write in my log table information of which record was changed, by whom and what was the value of old and new. If I instantiate an object before: db.Entry(chamados).State = EntityState.Modified; I can even compare, but this error appears at runtime. *An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key. * Podem me ajudar por favor?

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• Why has C prevailed over Pascal?

  - by Konrad Morawski

  My understanding is that in the 1980s and perhaps in the 1990s, too - Pascal and C were pretty much head-to-head as production languages. Is the ultimate demise of Pascal only due to Borland's neglection of Delphi? Or was there more of such bad luck; or perhaps something inherently wrong with Pascal (any hopes for its revival?). I hope it's not an open, unanswerable question. I'm interested in historical facts and observations one can back up, rather than likes and dislikes. I also failed to find a duplicate question, which actually surprised me somewhat.

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• Writing use cases for XML mapping scenarios between two different systems

  - by deepak_prn

  I am having some trouble writing use cases for XML mapping after a certain trigger invoked by the system. For example, one of the scenarios goes: the store cashier sells an item, the transaction data is sent to Data management system. Now, I am writing a functional design for the scenario which deals with mapping XML fields between our system and the data management system. Question : I was wondering if some one had to deal with writing use cases or extension use cases for mapping XML fields between two systems? (There is no XSLT involved) and if you used a table to represent the fields mapping (example is below) or any other visualization tool which does not break the bank ? I searched many questions on SO and here but nothing came close to my requirement.

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