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• OpenGL Game development for the Desktop / Platform issues

  - by anon

  Does anyone have experience writing professional OpenGL games on Windows? For the Mac, due to apple's control, the OS seems quite "uniform". For windows, due to different hardware, different drivers installed, etc ... the hardware base seems to have many many different configurations. In theory, OpenGL provides a API that abstracts all this away. In practice, many drivers are often buggy and have weird cases -- has this been a problem for developing games on Windows? Thanks!

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• Apache on linux : spawning processes or threads ?

  - by Jerome WAGNER

  Hello, I would like to understand better exactly what is going on when Apache on linux receive an HTTP request in a process pre-fork model. Let's say we have 20 Apache child processes waiting. When I receive an HTTP request, is it true to say that 1 child process will be chosen to handle the request and that this process won't handle another request from another user until the first one is finished ? I am asking the question because of a PHP limitation that states : The locale information is maintained per process, not per thread. If you are running PHP on a multithreaded server API like IIS or Apache on Windows, you may experience sudden changes in locale settings while a script is running, though the script itself never called setlocale(). This happens due to other scripts running in different threads of the same process at the same time, changing the process-wide locale using setlocale(). Thanks Jerome Wagner

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• Installing Loadrunner

  - by grouchomarx

  Well, it figures that Loadrunner is not easy to install. Apprently, we need: ? .NET Framework 3.5 ? Microsoft Data Access Components (MDAC) 2.8 SP1 (or later) ? Microsoft Windows Installer 3.1 ? Microsoft Core XML Services (MSXML) 6.0 ? Microsoft Visual C++ 2005 Redistributable Package (x86) ? Microsoft Visual C++ 2008 Redistributable Package (x86) ? Web Services Enhancements (WSE) 2.0 SP3 for Microsoft .NET Redistributable Runtime MSI ? Web Services Enhancements (WSE) 3.0 for Microsoft .NET Redistributable Runtime MSI Once done, I'm still trying to figure out how to execute this thing. Has anyone gone through the same experience with it ?

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• Touchscreen using sound input?

  - by ricardowong

  Hi, i don't really know if it is actually possible, but i believe that it can be made. How possible is it to make a program that recognizes different sound bouncing from the screen and turn it into a position that will obviously be later fed to the mouse. I know that it sounds kind of dumb, but lately i've been noticing that a very dull, strong sound is made when touching the screen, and that sound varies when doing so at different positions. Probably the microphone "hears" differently because the screen acts as a drum with the casing. Anyways, what do you think, anyone has any experience programming with sound?

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• What way to use the CGContext to draw is suitable?

  - by Tattat

  I know that the CGContext cannot call it to draw directly, and it needs to fill the drawing logic in the drawInContext, and call the CGContext to draw using "setNeedsDisplay", so, I designed a cmd to execute, but it cause some problems... like this : http://stackoverflow.com/questions/2617827/why-i-cant-draw-in-a-loop-using-uiview-in-iphone I think the CGContext is very different from my previous programming experience....(I used HTML5 canvas, that allow me add more details, after I draw, so do the Java Swing) Actually, I want to know what is the suitable to implement these kind of thing in Apples' programmer mind. Thz.

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• Sharp Architecture for Winform apps?

  - by CF_Maintainer

  The Sharp Architecture Contrib seems to suggest it is possible. It seemed like they had a dependency on "PostSharp" which has now been replaced with Castle interceptors. Has anyone used the Sharp Architecture for a non Web project? How was the experience? Does that mean one is locked in with castle as the IoC container when using Sharp architecture for non web purposes? If not Sharp Architecture, then what are some of the favored application frameworks for the non web world [spring.NET?] ? If one were to start a green field Winforms app, what application framework would be desirable?

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• To store images in SQL or not?

  - by Brett

  Generally, I had thought it was always better to store images in the filesystem and link to it via the database entry. However, I am trying to optimize my db design and am having a few questions. My images are all really small thumbmails in black and white (not greyscale, but true B&W) and are 70x70 in size. If we take the images (which is basically a 2D array of 1 and 0), it can be stored as binary data that would be approximately 600 bytes each. So my question is whether querying the 600 bytes stored in a db would be faster than querying a link followed by accessing the filesystem; assuming there are a lot of "image" queries being made. Does anyone have any experience with this area? If it matters, I am using MySQL, and MonetDB (separately, but have the same question for both). Many thanks, Brett

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• Android Development Tips, Tricks & Gotchas

  - by Mat Nadrofsky

  I'm starting down the road of Android Development. At this point I'm looking for some insight from other developers who have been doing 'droid development and have some experience to share with someone who is just starting out. This can be anything from API to AVM to IDE. Any unexpected things come up while building your apps? Any tips for project layout or organization that help facilitate the deployment process to the Android AppStore? Any patterns which specifically helped in a particular situation? Even links to great blogs or sample apps and resources beyond those which you can grab from Google Code would be appreciated.

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• Scala Actors with Java interop to underlying COM libraries

  - by wheaties

  I'm working on a JVM project which uses ESRI components (COM based, wrapped with JIntegra.) The client has requested the JAR files we produce work on the JVM and be accessible to Java code. I'd like to use Scala but I'm worried about how well the library will play with Scala's actors. Particularly I'm worried about the different mechanisms COM and Java employ to pass objects from one thread to another. Does anyone have any experience with this? Will they play nice? Edit: for clarification I noticed that when performing I/O on the ESRI DB that the CPU utilization is roughly 15%. I'd like to read each row and pass that row over to another actor for parsing. Then I could have several threads reading from the DB at once. The problem is that each row retrieved using ESRI's library is actually a Java wrapped COM object.

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• ASP.NET MVC View Engine Comparison

  - by McKAMEY

  EDIT: added a community wiki to begin capturing people's experience with various View Engines. Please respectfully add any experiences you've had. I've been searching on SO & Google for a breakdown of the various View Engines available for ASP.NET MVC, but haven't found much more than simple high-level descriptions of what a view engine is. I'm not necessarily looking for "best" or "fastest" but rather some real world comparisons of advantages / disadvantages of the major players (e.g. the default WebFormViewEngine, MvcContrib View Engines, etc.) for various situations. I think this would be really helpful in determining if switching from the default engine would be advantageous for a given project or development group. Has anyone encountered such a comparison?

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• Any good card game AI strategies?

  - by Mark

  What would be strategies for writing a good computer opponent for a card game? Most card games are games of incomplete information, so simply mapping out and traversing the game tree as one could do with a board game does not seem too promising. Maybe one could track what open cards are in the game (as soon as they are revealed) and assign probabilities to certain events (e.g. opponent still has 2 cards of clubs). Does anyone have experience with this? Links and directions greatly appreciated. Thanks! -Mark

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• Selecting Users For A/B (Champion/Challenger) Testing

  - by Gordon Guthrie

  We have a framework that offers A/B split testing. You have a 'champion' version of a page and you develop a 'challenger' version of it. Then you run the website and allocate some of your users the champion and some the challenger and measure their different responses. If the challenger is better than the champion at achieving your metrics then you dethrone the champion and develop a new challenger... My question is what mechanisms should I consider to allocate the versions? A number of options spring to mind: odd or even IP address (or sub-segments) ****.****.****.123 gets champion but .124 gets challenger cookie push - check for a champion/challenger cookie, if it doesn't exist randomly allocate the user to one and push the cookie Best practice? suggestions? comments? experience?

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• How to Debug XAML Parsing Errors in Silverlight?

  - by Nick Gotch

  I run into the following issue semi-regularly: I make changes to XAML or some resources used by it and when I go to load up the Silverlight project in debug mode it only gets as far as the spinning Silverlight-loading animation. I've tried attaching the VS08 debugger to the process but it doesn't do anything at this point (works fine once I'm in the Silverlight but not before.) From previous experience I've noticed this happens when there're problems with the XAML or the resources in it but my only solution so far has been to dissect the code line-by-line until I spot the problem. Is there an easy way to debug/diagnose these situations? UPDATE I found this question with some help, but it still doesn't provide a good way to debug these types of issues.

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• XML Signature in a Web application

  - by OpenDevSoft

  Hi, We are developing an e-Banking web application for a small bank (up to 20000 clients/users). We have to implement digital signatures with X509 certificates (issued by CA on USB tokens) for signing payment information. We tried using CAPICOM but it seems that it is not working well with Windows Vista (have not tried it with Win 7). The other problem is that core banking system can process only Xml digital signatures, so we have to sign XML documents (not just a bulk-formatted text data like with CAPICOM and Win32 Crypto API). So my questions here are: Does anyone of you have similar problem and how did they solved it? Is there a plug-in, library, component or external tool (for Internet Explorer and/or Fire Fox) that supports XML Digital Signatures in a web application? Can you please recommend some of these products and write something about your experience with them? Thank you very much.

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• How is Entity Framework 4's POCO support compared to NHibernate?

  - by Kevin Pang

  Just wondering if anyone has had any experience using Entity Framework 4's POCO support and how it stands up compared to NHibernate. If they're the same, I'd be very interested in making Entity Framework 4 my ORM of choice if only because it would: Support both data first AND object first development Have a robust LINQ provider Be easier to pitch to clients (since it's developed by Microsoft) Come baked into the .NET framework rather than requiring 8 dlls to get up and running In other words, are there any major shortcomings to EF4? Does it support all of the basic functionality NHibernate supports (lazy-loading, eager-loading, 1st level caching, etc.) or is it still rough around the edges? Is the syntax for setting up the mappings as easy as NHibernate and/or Fluent NHibernate? Edit: Please don't bring up the vote of no confidence. That was ages ago and dealt with some serious shortcomings of EF1 that really don't seem to apply anymore to EF4.

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• IIS7 Custom Errror Handling Troubles for Classic ASP Website

  - by Eaphis

  I recently upgraded a web server from IIS6 to IIS7 for a classic asp application and now experience a bizarre error. In the IIS6 set up there was a custom 500-100 page that functioned properly by capturing errors and delivering an email with error code, error source and error type values. That same structure was set up on the IIS7 machine but now the error emails contain no error information at all. They all come through values such as 'NO SPECIFIC ERROR CODE', 'NO SPECIFIC ERROR DESCRIPTION', 'NO SPECIFIC ERROR SOURCE'. Any one have some thoughts on why my custom error page cannot capture the error information?

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• Polygon triangulation

  - by Saurabh

  Hey, I am working on nesting of sheet metal parts and am implementing Minkowski Sums to find No Fit Polygons for nesting. The problem is I can give only convex sets as input to the code which calculates Minkowski sums for me. Hence I need to break a concave polygon, with holes into Convex sets. I am open to triangulation also, but I am looking for a working code on VC++ (6.0). I am slightly running short on time as my whole code is ready and just waiting for input in the form of convex sets. I would really appreciate if somebody with prior experience can help me in this. I have gone through other posts but did not find anything matching to this. I am a student of mechanical engineering and really dun have much idea about computer languages. All I can handle is compiling a code on VC++ and incorporate it with my existing code. Looking forward to responses!! Thanks Warm regards Saurabh India

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• Does Blogging affect Job Prospects?

  - by BM

  Would a hiring manager at a small-to-medium consulting firm/corporation consider active blogging by a candidate about Programming/software/technology as a positive? Should the candidate disclose this information during the interviews or put it on the resume? Thanks for the answers, So far the views about this topic has been.. Don't mention the blog if it is not relevant to the job. Mention the blog, if you believe your blog has quality content. Potential risk of not being accepted by culture of the employer's workplace. Could be a valuable for consultants to publish & preview their skills and experience. Certain Employers may consider blogging of a candidate a plus. Be careful what you post on the blog,no badmouthing,rants and overt criticism of others. Do not lie about blogging,if directly asked during the interview.

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• Add a delay to OnContactDown events for Surface controls

  - by RTigger

  We're using the Controls.PreviewContactDown, PreviewContactUp, and PreviewContactChanged events to capture tagged items being placed, removed, and moved on the Surface, which works great in the Simulator application that comes with the surface. On an actual Surface if you moved a tagged item too quickly the cameras actually lose focus of the tag, assume it was removed, and then re-capture it when it stops moving. That provides a pretty poor experience for our clients. What I'm proposing is a way to override or create a new event that would respond to tagged item events, but not fire the event handler until after a delay... i.e. if "ContactUp" is fired, wait 100ms and THEN execute the event handler. Ideally we'd just be able to use an alternate attached property to define these event handlers, i.e. <Panel local:TagDown="TagDownEventHandler" /> And if we could get it to use ICommand objects instead of event handlers that'd be even better.

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• JPA 2.0 Implementations comparison : Hibernate 3.5 vs EclipseLink 2 vs OpenJPA 2

  - by peperg

  What's your choice? Do You have any suggestions and experience? I'm developing an application with Hibernate 3.5 and Spring 3.0 Pros: Good documentation Easy configuration and helpful logs Popularity - wide community Some extensions to JPA Some additional Tools - JBoss Tools for Eclipse, hbm2ddl, generating static metamodel etc... Cons: Bugs! (Sequences, collections etc...) Lots of reatures are doubled with "pure" Hibernate. There's a mess in legacy Hibernate and JPA annotations. I'm considering to switch to EclipseLink. What do You think ? Edit: I've tried EclipseLink and have very bad experiences. It seems like EclipseLink needs LoadTimeWeaver and likes to run on OSGi platform rather than simple Jetty or Tomcat environment. I just don't have time for all this configuration stuff.

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• Is it worth learning Perl 6?

  - by Andres

  I have the opportunity to take a two day class on Perl 6 with the Rakudo Compiler. I don't want to start a religious war, but is it worth my time? Is there any reason to believe that Perl 6 will be practical in the real world within the next two years? Does anyone currently use it effectively? Update I took the class and learned a lot. However, after day 1, my mind was a bit overwhelmed. There are tons of cool ideas in perl 6, and it will be neat to see what filters up to other languages. Overall the experience was a positive use of my time, though I wasn't able to absorb as much on the second day. If it were a three day class it would have been unproductive just because there is a limit to how much you can process in a short amount of time.

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• What are the best programming and development related Blogs?

  - by Christopher Cashell

  There are lots of great resources available on the Internet for learning more about programming and improving your skills. Blogs are one of the best, IMO. There's a wealth of knowledge and experience, much of it covering topics not often found in traditional books, and the increased community aspect helps to bring in multiple viewpoints and ideas. We're probably all familiar with Coding Horror and Joel on Software (so no need to mention them), but what are the other great ones out there? What are the Blogs that you find yourself following most closely? Where you see the best new ideas, the most interesting or informative ideas, or just the posts that make you sit back and think? One Blog per answer, and then we'll vote up the best so we can all learn from them.

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• reinventing the wheels: Node.JS/Event-driven programming v.s. Functional Programming?

  - by ivanTheTerrible

  Now there's all the hype lately about Node.JS, an event driven framework using Javascript callbacks. To my limited understanding, its primary advantage seems to be that you don't have to wait step by step sequentially (for example, you can fetch the SQL results, while calling other functions too). So my question is: how is this different, or better than just functional languages, like CL, Haskell, Clojure etc? If not better, then why don't people just do functional languages then (instead of reinventing the wheel with Javascript)? Please note that I have none experience in either Node.JS nor functional programming. So some basic explanation can be helpful.

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• PageMethods security

  - by TenaciousImpy

  Hi, I'm trying to 'AJAX-ify' my site in order to improve the UI experience. In terms of performance, I'm also trying to get rid of the UpdatePanel. I've come across a great article over at Encosia showing a way of posting using PageMethods. My question is, how secure are page methods in a production environment? Being public, can anyone create a JSON script to POST directly to the server, or are there cross-domain checks taking place? My PageMethods would also write the data into the database (after filtering). I'm using Forms Authentication in my pages and, on page load, it redirects unauthenticated users to the login page. Would the Page Methods on this page also need to check authentication if the user POSTs directly to the method, or is that authentication inherited for the entire page? (Essentially, does the entire page cycle occur even if a user has managed to post only to the PageMethod)? Thanks

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• Tutorials for .NET database app using SQLite

  - by ChrisC

  I have some MS Access experience, and had a class on console c++ apps, now I am trying to develop my first program. It's a little C# db app. I have the db tables and columns planned and keyed into VS, but that's where I'm stuck. I'm needing C#/VS tutorials that will guide me on configuring relationships, datatyping, etc, on the db so I can get it ready for testing of the schema. The only tutorials I've been able to find either talk about general db basics (ie, not helping me with VS/C#), or about C# communications with an existing SQL db. Thank you. (In case it matters, I'm using the open source System.Data.SQLite (sqlite.phxsoftware.com) for the db. I chose it over SQL Server CE after seeing a comparison between the two. Also I wanted a server-less version of SQL because this little app will be on other people's computers and I want to to do as little support as possible.)

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