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• Lua and multi-paradigm programming: scope and capabilities

  - by Ef Es

  Despite having started learning programming with Pascal and C, after the jump to OO (C++, Java) I lost sense of the structured programming paradigm. I have started learning Lua and I have researched many tutorials, but all of them only cover basic operations and language features and capabilities. They feel more like a reference doc than a programmer's guide. Now, when trying to work with day to day tasks, how does one go through most common design patterns like observer, or multithreaded programming, creating UI elements and polling system calls for keyboard or sensors? Is it even feasible in this languages or you have to work with the C binding, libraries and low-level programming to get most stuff done? Do I get the Lua scope wrong?

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• How can I allow a user to stream my videos securely?

  - by John Baber

  I've got a script that records 10 minute videos from a webcam to video1.mp4 video2.mp4 video3.mp4 video4.mp4 Then records over video1 again in rotation. I'd like one user to be able to view these in winamp or itunes by having a playlist with the four of them on repeat. (This is my way of getting around the many hours of figuring out how to actually livestream from a webcam with VLC). I don't see any examples of things like icecast being used for video, and I don't see any mentions of secure streaming. My question is, is there any way to have these videos be seen securely? I can do things like https on my server, but I don't have great access to the user's machine, so just sharing a directory by samba or sshfs isn't much of an option.

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• 3D Collision help

  - by Taylor

  I'm having difficulties with my project. I'm quite new in XNA. Anyway, I'm trying to make 3D game and I'm already stuck on one basic thing. I have terrain made from a heightmap, and an avatar model. I want to set up some collisions for game so the player won't go through the ground. But I just don't know how to detect collisions for so complex an object. I could just make a simple box collision for my avatar, but what about the ground? I already implemented the JigLibX physics engine in my project and I know that I can make a collision map with heightmap, but I can't find any tutorials or help with this. So how can I set proper collision for complex objects? How can I detect heightmap collisions in JigLibX? Just some links to tutorials would be enough. Thanks in advance!

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• Switching hosting from Google Apps to GoDaddy

  - by Sahir M.

  I am in a pickle here. I just bought a hosting service from GoDaddy and I already have a domain registered with Google Apps. So I went into the domain control center from Google Apps and I changed the nameservers to point to GoDaddy's and then I deleted all the A records and also removed the www and main CNAME. Then I created an A record with host "@" which points to the IP address I got from GoDaddy (this is the server address I see under the category Server in the GoDaddy Hosting Control Center). Also, I see that in this domain center, the domain forwarding is set to forward to my address "www.domainsite.com". So right now when I go to my website I see the error "This website is temporarily unavailable, please try again later." Does anyone know how to set this up properly or know what problem I could be having? Thanks!

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• Learning the basics

  - by Kevin

  I am a Linux server administrator first and foremost... Having said that, I have been asked by a former high school teacher of mine to teach students a bit about programming. Like any Linux administrator, I know my fair share of Python and Bash. The problem is that I know NOTHING about the lower level stuff like "machine code" and compilation. The main purpose of this series is to teach programming, not computer science, so I don't need a graduate degree's level of knowledge for this, they will be learning Python first and foremost. However, I would like to learn enough to at least broach the subject with them, any ideas where I can learn that kind of stuff relatively quickly?

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• Is it Considered Good SQL practice to use GUID to link multiple tables to same Id field?

  - by Mallow

  I want to link several tables to a many-to-many(m2m) table. One table would be called location and this table would always be on one side of the m2m table. But I will have a list of several tables for example: Cards Photographs Illustrations Vectors Would using GUID's between these tables to link it to a single column in another table be considered 'Good Practice'? Will Mysql let me to have it automatically cascade updates and delete? If so, would multiple cascades lead to an issues? UPDATE I've read that GUID (a hex number) Generally takes up more space in a database and slows queries down. However I could still generate 'unique' ids by just having the table initial's as part of the id so that the table card's id would be c0001, and then Illustrations be I001. Regardless of this change, the questions still stands.

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• How to have operations with character/items on binary with concrete operations on C++?

  - by Piperoman

  I have the next problem. A item can have a lot of states: NORMAL = 0000000 DRY = 0000001 HOT = 0000010 BURNING = 0000100 WET = 0001000 COLD = 0010000 FROZEN = 0100000 POISONED= 1000000 A item can have some states at same time but not all of them Is impossible to be dry and wet at same time. If you COLD a WET item, it turns into FROZEN. If you HOT a WET item, it turns into NORMAL A item can be BURNING and POISON Etc. I have tried to set binary flags to states, and use AND to combine different states, checking before if it is possible or not to do it, or change to another status. Does there exist a concrete approach to solve this problem efficiently without having an interminable switch that checks every state with every new state? It is relatively easy to check 2 different states, but if there exists a third state it is not trivial to do.

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• Best way to slice up a non rectangular image?

  - by Hoff

  I have the image below and need to create a rollover for each "piece" or arrow in the circle. Because the image isn't rectangular, it boggles how me how I'm going to do this without having badly overlapping pieces. As you can see from the image below, the slices will overlap each other (quite a bit), which will not be good for the rollover. Does anybody have any ideas as to how to accomplish this without resorting to Flash or HTML5? The majority of our site's users use dinosaur browsers that don't support HTML5. Here's the link to the image: http://img812.imageshack.us/img812/3166/wheela.png

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• How can I link to callback functions in Lua such that the callbacks will be updated when the scripts are reloaded?

  - by Raptormeat

  I'm implementing Lua scripting in my game using LuaBind, and one of the things I'm not clear on is the logistics of reloading the scripts live ingame. Currently, using the LuaBind C++ class luabind::object, I save references to Lua callbacks directly in the classes that use them. Then I can use luabind::call_function using that object in order to call the Lua code from the C++ code. I haven't tested this yet, but my assumption is that if I reload the scripts, then all the functions will be redefined, BUT the references to the OLD functions will still exist in the form of the luabind::object held by the C++ code. I would like to be able to swap out the old for the new without manually having to manage this for every script hook in the game. How best to change this so the process works? My first thought is to not save a reference to the function directly, but maybe save the function name instead, and grab the function by name every time we want to call it. I'm looking for better ideas!

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• No keyring secrets found for [ssid] /802-11-wireless-security, ubuntu 12.04

  - by acimer

  I'm on Ubuntu 12.04 x64bit, installed it couple of days ago. The issue i'm having is this: on startup it connects to my wireless without a problem, but after a while I am disconnected and prompted to enter the key for the wireless network (which is entered - saved) so i just click 'ok', but wireless doesn't connect again. Reseting network manager doesn't help either. Only restart, after which, ubuntu connects to the said wireless without a problem. Terminal outputs this error message: ** Message: No keyring secrets found for cimermanovic /802-11-wireless-security; asking user. cimermanovic is the ssid name. also, here are some error messages that network manager is giving: (nm-applet:31926): GdkPixbuf-CRITICAL **: gdk_pixbuf_scale_simple: assertion `dest_width 0' failed (nm-applet:31693): GdkPixbuf-CRITICAL **: gdk_pixbuf_scale_simple: assertion `dest_width 0' failed (nm-applet:30184): GdkPixbuf-CRITICAL **: gdk_pixbuf_scale_simple: assertion `dest_width 0' failed What should i do to fix this? Thanks!

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• Images not indexed by google since moving to cdn

  - by dfunkydog

  Last week I moved all the images on coffeeandvanilla.com to a cdn( maxcdn.coffeeandvanilla.com ). The problem I'm having is that although the sitemap—generated by yoast wordpress seo plugin—points images to the correct location, google only indexes[sic] images from the category and page site maps but 0 images from the posts sitemap( see screenshot https://dl.dropbox.com/u/4635252/sitemap.png ) This website has been doing quite well with google image-search before the change, visits from google image search have dropped from ~200/day to 11 yesterday Here is an example entry from the generated posts.xml sitemap http://pastebin.com/vcMRf9VW Can anyone suggest where the problem lies? Why have I lost all my google image juice? Should I just wait some more, how long before really worrying?

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• Ubuntu 12.04 version of Netbeans doesn't have the JavaFX plugin

  - by aliasbody

  I just want to know why does Netbeans 7.0.1 from the official Ubuntu 12.04 doesn't have all the plugins (in especial the JavaFX plugin) on it while the official Netbeans from the website (even the version with the less plugin), has it by default ? And how can we change that ? Because I love Ubuntu (even if it is extremly slow on my Asus 1215N (it is the only OS that is slow on it, but that's not very important), but I am trying to use it only with the software provided by the Original repositories without having to download manually or even use any PPA. Thanks in Advance

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• Dropbox icon dissapears right after login

  - by garvamel

  Even though Dropbox's app indicator dissapearing from the tray area seems like a recurrent enough problem, my issue is a litte different. When I login, I can see the app panel populating, and the dropbox icon does indeed appear (config'd as startup application), but after some other icons show up (bluetooth, battery, etc.) it's gone. It's still running though. I'm guessing it's having issues with staying pinned, and I don't know how to start addressing this problem. I have tried many if not all solutions provided here in the forums for the "icon missing" questions. So far: I've whitelisted everything regarding panel Uninstalled-reinstalled (with and without rebooting in between) Overwritten current installation Purged installation from terminal Installed from Software Center and from .deb file batch deleted every "dropbox" ocurrences from terminal (files and folders) and reinstalled Ran sudo apt-get install libappindicator1, it installed, but didn't solve anything I'm on Ubuntu 12.04 LTS - 64 bits. Any insight would me much appreciated!

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• How important is it that you know the C++ standard?

  - by Nim

  I did try searching, but I did not see a similar question (either that or my search terminology was incorrect - if so, feel free to close). I am an avid user of SO, and I notice that there are lots of references to the C++ standard in discussions and answers - and I have to admit, I have never read this particular document, the language makes my eyes hurt... So, the question is, can a C++ developer really code for a living without ever having read this document? Is it really important for us mere mortals who are not in the business of writing compilers?

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• dpkg returns error 10 when processing package php5-common

  - by Jesse

  I'm having trouble installing php in 13.04. Seems like the package manager can't (re)configure the php package. I already tried purging every php* package, removing the cache files in /var/cache/aptbut and other solutions I've found but nothing seems to work. Here's the error output: $ sudo dpkg --configure -a Setting up php5-common (5.4.9-4ubuntu2.3) ... dpkg: error processing php5-common (--configure): subprocess installed post-installation script returned error exit status 10 Errors were encountered while processing: php5-common sudo apt-get install -f sudo apt-get install php5-common php5 they all return the same error. How can I fix this?

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• How to get innovation in product development?

  - by simonsabin

  I was at Redgate last week and say plastered all over the canteen wall flip chart sheets with ideas scrawled over them. I was going to take a photo but thought it might not be allowed. I asked what it was all about and they told me that ALL the development team are going to stop working on what they are doing and do whatever they want. Whatever they want? yes So thats the whole team working on something? No, it can be individual or in groups. Having worked in product teams before I and the others...(read more)

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• "Wireless disabled by hardware switch" after suspend and other hardware buttons ineffective - how can I solve this?

  - by fahadayaz

  I have recently purchased a Novatech nFinity N1410 laptop and am having problems with the wireless, which sudo lshw -C network tells me is Centrino Wireless-N 2230 and using the iwlwifi driver. The problem is that after the device has been suspended, I am not able to get the wireless working again without a restart. The network indicator states that the wireless disabled by hardware switch. Though Fn+F2 is meant to be the wireless switch, xev tells me that the system doesn't see it as anything at all when I press this hardware combination. Also, though the brightness up/down buttons work fine, the volume up/down buttons do not work either. What can I do to fix this? I am running Ubuntu 12.10 with all available updates installed.

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• iPhone 3d Model format: .h file, .obj, or some other?

  - by T Reddy

  I'm beginning to write an iPhone game using OpenGL-ES and I've come across a problem with deciding what format my 3D models should be in. I've read (link escapes me at the moment) that some developers prefer the models compiled in Objective-C .h files. Still, others prefer having .obj as these are more portable (i.e., for deployment on non-iPhone platforms). Various 3D game engines seem to support many(?) formats, but I'm not going to use any of these engines as I would like to actually learn OpenGL-ES. Am I putting myself at a disadvantage here by not using a packaged engine? Thanks!

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• Deferred contexts and inheriting state from the immediate context

  - by dreijer

  I took my first stab at using deferred contexts in DirectX 11 today. Basically, I created my deferred context using CreateDeferredContext() and then drew a simple triangle strip with it. Early on in my test application, I call OMSetRenderTargets() on the immediate context in order to render to the swap chain's back buffer. Now, after having read the documentation on MSDN about deferred contexts, I assumed that calling ExecuteCommandList() on the immediate context would execute all of the deferred commands as "an extension" to the commands that had already been executed on the immediate context, i.e. the triangle strip I rendered in the deferred context would be rendered to the swap chain's back buffer. That didn't seem to be the case, however. Instead, I had to manually pull out the immediate context's render target (using OMGetRenderTargets()) and then set it on the deferred context with OMSetRenderTargets(). Am I doing something wrong or is that the way deferred contexts work?

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• most efficient AABB vs Ray collision algorithms

  - by Asher Einhorn

  Is there a known 'most efficient' algorithm for AABB vs Ray collision detection? I recently stumbled accross Arvo's AABB vs Sphere collision algorithm, and I am wondering if there is a similarly noteworthy algorithm for this. One must have condition for this algorithm is that I need to have the option of querying the result for the distance from the ray's origin to the point of collision. having said this, if there is another, faster algorithm which does not return distance, then in addition to posting one that does, also posting that algorithm would be very helpful indeed. Please also state what the function's return argument is, and how you use it to return distance or a 'no-collision' case. For example, does it have an out parameter for the distance as well as a bool return value? or does it simply return a float with the distance, vs a value of -1 for no collision? (For those that don't know: AABB = Axis Aligned Bounding Box)

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• problem with template: negative margins on float

  - by Fuxi

  i'm having a very strange problem with the wordpress template. i'd like to place 2 divs besides each other like this: <div style='float:left;'> left div </div> <div style='float:right'> right div </div> normally this works as it should - both divs should stick directly to each other - but something in the style.css (which uses css reset) causes the right div to overlap the left div with ~ 5pixels. i searched the whole .css for it but couldn't find out :(( it's just a fact that it must be something with the default css. anyone knows what is causing this - some fix? thanks

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• What is the worst software bug in history? [closed]

  - by Amir Rezaei

  By having for example money and human suffering as the metric. What is the worst software bug in history? Note this is a specific question. Last month automaker Toyota announced a recall of 160,000 of its Prius hybrid vehicles following reports of vehicle warning lights illuminating for no reason, and cars' gasoline engines stalling unexpectedly. But unlike the large-scale auto recalls of years past, the root of the Prius issue wasn't a hardware problem -- it was a programming error in the smart car's embedded code. The Prius had a software bug.

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• Will the netinstall (minimal) work with a USB cellular modem?

  - by Z9iT

  Installing Ubuntu minimal is extremely easy when the system has a LAN card and connected to internet via Cable & Router... I Recently came across a situation where I needed to install Ubuntu Minimal on a system which wash not having a LAN card and cable internet anywhere around... The only access to the internet was through a USB Plug n Play Data-Card Modem. May anyone suggest something so that I may install Ubuntu Minimal using USB Modem as the only source of Internet, if it's possible at all?? (This relates to Ubuntu 12.04 in specific)

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• Greatly Enhanced LINQ Capabilities in Devart ADO.NET Data Providers

  Devart has recently announced the release of dotConnect products for Oracle, MySQL, PostgreSQL, and SQLite - ADO.NET providers that offer Entity Framework support, LINQ to SQL support, and contain an ORM model designer for developing LINQ to SQL and EF models based on different database engines. New dotConnect ADO.NET Providers offer advanced LinqConnect ORM solution (formerly known as Devart LINQ support) closely compatible with Microsoft LINQ to SQL and having its own advanced features. Devart...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Is there any advantage/disadvantage to using robots.txt to disallow access to legal pages such as terms, privacy policy, etc.?

  - by CaptainCodeman

  As I understand, having repetitive content is a detriment to search engine placement. Given that many websites that use similar or even identical "Terms and Conditions" and "Privacy Policy" pages due to similar legal wording or due to copy & pasting from the same source, would it be a good idea to disallow access to these pages via robots.txt, in order to avoid being penalized for "non-original content"? Or, on the contrary, could the search engines identify this as circumvention and penalize the site for trying to hide content? Or does it not matter?

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