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• Can you recommend a game server for a facebook board game?

  - by Yekmer Simsek

  I am seeking a game server that will scale well. All commercial and/or free software alternatives are welcome. Game will be a boardgame that is similar to poker. Some technical details are listed below. There will be a table which consists of 4 people, to send them message I need a channel manager. A table will be ready to play for at least 5 minutes. There should be a reliable channel manager. People will wait for some time(i.e.) and if they are not playing they will be kicked by server, so there will be a reliable timed task queue to execute some tasks. It should be quick enough to response and show the changes to all 4 people on that table simultaneously.To achive this server should have a powerfull I/O library. I think to use inmemory to have quick response times, but it comes with scalability problems. And some variables should be thread safe so a variable should be thread safe between multiple nodes. Flash(AS3) and Unity (.Net 2.0 C# mono) client API's should be available for socket connection. PS: I am using Reddwarf server, it lacks of documentation and multiple node.

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• Windows 8 power-shell "update-help" is failing. Does anyone know how to fix it?

  - by Warren P

  Windows 8 includes PowerShell out of the box, but not the help. To get the help you run PowerShell as administrator and type "update-help". I get this error: > update-help update-help : Failed to update Help for the module(s) 'BitLocker, NetWNV' with UI culture(s) {en-US} : The value of the HelpInfoUri key in the module manifest must resolve to a container or root URL on a website where the help files are stored. The HelpInfoUri 'http://technet.microsoft.com/library/cc732148.aspx' does not resolve to a container. At line:1 char:1 + update-help + ~~~~~~~~~~~ + CategoryInfo : InvalidOperation: (:) [Update-Help], Exception + FullyQualifiedErrorId : InvalidHelpInfoUri,Microsoft.PowerShell.Commands.UpdateHelpCommand Can anyone tell me how I fix this or if it's not important? I'm guessing that if I don't need help on NetWNV or BitLocker, that this is the only thing wrong?

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• Do there exist programming languages where a variable can truly know its own name?

  - by Job

  In PHP and Python one can iterate over the local variables and, if there is only once choice where the value matches, you could say that you know what the variable's name is, but this does not always work. Machine code does not have variable names. C compiles to assembly and does not have any native reflection capabilities, so it would not know it's name. (Edit: per Anton's answer the pre-processor can know the variable's name). Do there exist programming languages where a variable would know it's name? It gets tricky if you do something like b = a and b does not become a copy of a but a reference to the same place. EDIT: Why in the world would you want this? I can think of one example: error checking that can survive automatic refactoring. Consider this C# snippet: private void CheckEnumStr(string paramName, string paramValue) { if (paramName != "pony" && paramName != "horse") { string exceptionMessage = String.Format( "Unexpected value '{0}' of the parameter named '{1}'.", paramValue, paramName); throw new ArgumentException(exceptionMessage); } } ... CheckEnumStr("a", a); // Var 'a' does not know its name - this will not survive naive auto-refactoring There are other libraries provided by Microsoft and others that allow to check for errors (sorry the names have escaped me). I have seen one library which with the help of closures/lambdas can accomplish error checking that can survive refactoring, but it does not feel idiomatic. This would be one reason why I might want a language where a variable knows its name.

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• Client and Server game update speed

  - by user20686

  I am working on a simple two player networked asteroids game using XNA and the Lidgren networking library. For this set up I have a Lidgren server maintaining what I want to be the true state of the game, and the XNA game is the Lidgren client. The client sends key inputs to the server, and the server process the key inputs against game logic, sending back updates. (This seemed like a better idea then sending local positions to the server.) The client also processes the key inputs on its own, so as to not have any visible lag, and then interpolates between the local position and remote position. Based on what I have been reading this is the correct way to smooth out a networked game. The only thing I don’t get is what value to use as the time deltas. Currently every message the server sends it also sends a delta-time update with it, which is time between the last update. The client then saves this delta time to use for its local position updates, so they can be using roughly the same time deltas to calculate position updates. I know the XNA game update gets called 60 times a second, so I set my server to update the game state at the same speed. This will probably only work as long as the game is working on a fixed time step and will probably cause problems if I want to change that in the future. The server sends updates to clients on another thread, which runs at 10 updates per second to cut down on bandwidth. I do not see noticeable lag in movement and over time if no user input is received the local and remote positions converge on each other as they should. I am also not currently calculating for any latency as I am trying to go one step at a time. So my question is should the XNA client be using its current game time to update the local game state and not being using time deltas sent by the server? If I should be using the clients time delta between updates how do I keep it in-line with how fast the server is updating its game state?

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• In C++ Good reasons for NOT using symmetrical memory management (i.e. new and delete)

  - by Jim G

  I try to learn C++ and programming in general. Currently I am studying open source with help of UML. Learning is my hobby and great one too. My understanding of memory allocation in C++ is that it should be symmetrical. A class is responsible for its resources. If memory is allocated using new it should be returned using delete in the same class. It is like in a library you, the class, are responsibility for the books you have borrowed and you return them then you are done. This, in my mind, makes sense. It makes memory management more manageable so to speak. So far so good. The problem is that this is not how it works in the real world. In Qt for instance, you create QtObjects with new and then hand over the ownership of the object to Qt. In other words you create QtObjects and Qt destroys them for you. Thus unsymmetrical memory management. Obviously the people behind Qt must have a good reason for doing this. It must be beneficial in some kind of way, My questions is: What is the problem with Bjarne Stroustrups idea about a symmetrical memory management contained within a class? What do you gain by splitting new and delete so you create an object and destroy it in different classes like you do in Qt. Is it common to split new and delete and why in such case, in other projects not involving Qt? Thanks for any help shedding light on this mystery!

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• Beaglebone Black running Debian, does device tree overlay act as an api?

  - by user3953989

  This maybe more of a Linux specific question but... I've been reading many tutorials and it seems that you can use JavaScript, Python, and C++ to write code for the Beaglebone Black(BBB). It looks like the way C++ interfaces with the BBB hardware is via reading/writing text files on the OS while Python has it's own library. All the C++ examples out there control the GPIO and PWM via reading/writing to text files. Is this the only way to access the hardware or just how Linux does drivers?

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• Which jar has JBox2d's p5 package

  - by Brantley Blanchard

  Using eclipse, I'm trying to write a simple hello world program in processing that simply draws a rectangle on the screen then has gravity drop it as seen in this Tutorial. The problem is that when I try to import the p5 package, it's not resolving so I can't declare my Physics object. I tried two things. Download the zip, unzip it, then import the 3 jars (library, serialization, & testbed) a. import org.jbox2d.p5.*; doesn't resolve but the others do b. Physics physics; doesn't resolve Download the older standalone testbed jar then import it a. Physics physics; doesn't resolve; Here is basically where I'm starting import org.jbox2d.util.nonconvex.*; import org.jbox2d.dynamics.contacts.*; import org.jbox2d.testbed.*; import org.jbox2d.collision.*; import org.jbox2d.common.*; import org.jbox2d.dynamics.joints.*; import org.jbox2d.p5.*; import org.jbox2d.dynamics.*; import processing.core.PApplet; public class MyFirstJBox2d extends PApplet { Physics physics; public void setup() { size(640,480); frameRate(60); initScene(); } public void draw() { background(0); if (keyPressed) { //Reset everything physics.destroy(); initScene(); } } public void initScene() { physics = new Physics(this, width, height); physics.setDensity(1.0f); physics.createRect(300,200,340,300); } }

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• php5-suhosin Broken Installation

  - by h00j

  Hi i get the following error when trying to install, have you any idea how to fix? apt-get install php5-suhosin Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: php5-suhosin : Depends: phpapi-20090626 E: Unable to correct problems, you have held broken packages. I get the following error in my apache2 error log [Mon May 07 21:43:15 2012] [error] [client ip] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20100525/suhosin.so' - /usr/lib/php5/20100525/suhosin.so: cannot open shared object file: No such file or directory in Unknown on line 0

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• How to run a command in a process that is not a child of the current process?

  - by amicitas

  I am having a library conflict issue with calling an external program from within a interpreted programming environment (IDL). The issue seems to be that since the program I am calling ends up as a child of IDL, libraries are not being reloaded. From within IDL I can launch sub-processes either directly or using a shell. Is there a good way that I can cause my program to be run without ending up as a child process? The only solution I have found so far is to use ssh localhost my_program. This works perfectly but I would like a more direct solution.

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• how can i disable safe mode for php on web server?

  - by user1767434

  I am using wkhtmltopdf for making a pdf of a page. My code executes the shell to run a command using this wkhtmltopdf library. Everything works fine in my wamp server but when the code runs on my web-server it does not work and gives the following error: Warning: shell_exec() has been disabled for security reasons in /home/pssptech/public_html/.../cert.php on line 272 I think that the php is running on safe mode on the server that's why the shell execution is disabled. But the main problem is I am unable to find the php.ini file on my remote web-server. Can you tell me where can I find the config file so that I can disable the safe mode? Thanks in advance.

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• How to disable the link MissingFile on Shotwell

  - by user86865

  I have some personal photos which are encrypted by CryptKeeper. I doesn't like to disclose them to anyone. Whenever i lke to view them, I mount them using CryptKeeper. I need to include these photos in Shotwell photo manager at the time of mounting. So, I mounted them using CryptKeeper. Then I imported them to Shotwell. I made a new event and etc to organize and view those photos. After that I unmounted them using CryptKeeper because someone may see it. Now I don't want any single trail on Shotwell beacuse of the same problem. But there is a new button 'MissingFiles' appeared and when i clicked on it, all the photo thumbnail which i unmounted showed there. I dont't want right'click on them and select 'remove from library'; beacuse when i want to view them next time on Shotwell, I need to import, organize, etc at that time. So, the only option here is to disable the unavailability of that MisssingFiles button.

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• How much ram to be able to convert large (5-6MB) jpegs? [closed]

  - by cosmicbdog

  I've got a project where we want to be processing large jpegs (5-6MB) with apache and php (using GD library). My understanding is that the server converts the image into a BMP making it quite ram heavy and currently we're unable to do it with our 1gb of memory. Here's the error we get: Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 17408 bytes) How much ram should we be looking at running with to process images of this size? Edit: As Chris S the purist highlighted below, my post is apparently vague. I am doing the most basic and common manipulation of an image, say turning it from a 4352px x 3264px jpg of 5mb in size, to a 900px x 675px file.

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• Visual Studio 2010 locking referenced Assembly

  - by cunningdave

  I have a sandbox app that is built from the simple WPF Application template. This sandbox references an assembly that I am also building which contains the definition of a UserControl (WPF). I am instantiating this user control in the sandbox, to test the control's behaviour. The point of all this is to speed up development. This worked fine, but recently the .Vshost.exe paired with the sandbox process won't shut down. This prevents me from recompiling the Controls library, though ironically I can recompile the sandbox application. I can't kill the vshost process with Task Manager... only restarting VS2010 will clear it out. But every time I run the application from VS, the process just hangs there, blocking my workflow. I'm at a loss. Any ideas what could be causing this? Or does someone have any proposed workaround (mega-kill switch, perhaps?)

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• linux system problem

  - by snakec

  very first thanks to u all for Ur support. I'm quite new to Linux .i know how to install software but i don't know 1: how to install library .a or .so files i: how to install tar.gz i use the method like ./configure. make make install but most of the time i got the message nothing to make .in lots of tar.gz there is no installation document no make file no .configure file that make me quite confused how to install them or run them now i got sample source code of cuda i got them in tar.gz form when i extract them i found a folder in folder i found folder like c ,doc,shared etc when i open each folder i found more folder n file like that src, doc common ,lib, in these folder i found source code file header files libraries file make files i don't know how to run this kind of project can the be installed on the system how to run them they don't have .run file or script they don't have configure file can any one explain me how to compile them ,how to run them & how to install them

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• moving in the wrong direction

  - by Will

  Solution: To move a unit forward: forward = Quaternion(0,0,0,1) rotation.normalize() # ocassionally ... pos += ((rotation * forward) * rotation.conjugated()).xyz().normalized() * speed I think the trouble stemmed from how the Euclid math library was doing Quaternion*Vector3 multiplication, although I can't see it. I have a vec3 position, a quaternion for rotation and a speed. I compute the player position like this: rot *= Quaternion().rotate_euler(0.,roll_speed,pitch_speed) rot.normalize() pos += rot.conjugated() * Vector3(0.,0.,-speed) However, printing the pos to console, I can see that I only ever seem to travel on the x-axis. When I draw the scene using the rot quaternion to rotate my camera, it shows a proper orientation. What am I doing wrong? Here's an example: You start off with rotation being an identity quaternion: w=1,x=0,y=0,z=0 You move forward; the code correctly decrements the Z You then pitch right over to face the other way; if you spin only 175deg it'll go in right direction; you have to spin past 180deg. It doesn't matter which direction you spin in, up or down, though Your quaternion can then be something like: w=0.1,x=0.1,y=0,z=0 And moving forward, you actually move backward?! (I am using the euclid Python module, but its the same as every other conjulate) The code can be tried online at http://williame.github.com/ludum_dare_24_evolution/ The only key that adjusts the speed is W and S. The arrow keys only adjust the pitch/roll. At first you can fly ok, but after a bit of weaving around you end up getting sucked towards one of the sides. The code is https://github.com/williame/ludum_dare_24_evolution/blob/cbacf61a7159d2c83a2187af5f2015b2dde28687/tiny1web.py#L102

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• share code between check and process methods

  - by undu

  My job is to refactor an old library for GIS vector data processing. The main class encapsulates a collection of building outlines, and offers different methods for checking data consistency. Those checking functions have an optional parameter that allows to perform some process. For instance: std::vector<Point> checkIntersections(int process_mode = 0); This method tests if some building outlines are intersecting, and return the intersection points. But if you pass a non null argument, the method will modify the outlines to remove the intersection. I think it's pretty bad (at call site, a reader not familiar with the code base will assume that a method called checkSomething only performs a check and doesn't modifiy data) and I want to change this. I also want to avoid code duplication as check and process methods are mostly similar. So I was thinking to something like this: // a private worker std::vector<Point> workerIntersections(int process_mode = 0) { // it's the equivalent of the current checkIntersections, it may perform // a process depending on process_mode } // public interfaces for check and process std::vector<Point> checkIntersections() /* const */ { workerIntersections(0); } std::vector<Point> processIntersections(int process_mode /*I have different process modes*/) { workerIntersections(process_mode); } But that forces me to break const correctness as workerIntersections is a non-const method. How can I separate check and process, avoiding code duplication and keeping const-correctness?

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• Does the .NET Framework need to be reoptimized after upgrading to a new CPU microarchitecture?

  - by Louis

  I believe that the .NET Framework will optimize certain binaries targeting features specific to the machine it's installed on. After changing the CPU from an Intel Nehalem to a Haswell chip, should the optimization be run again manually? If so, what is the process for that? Between generations here are some notable additions: Westmere: AES instruction set Sandy Bridge: Advanced Vector Extensions Ivy Bridge: RdRand (hardware random number generator), F16C (16-bit Floating-point conversion instructions) Haswell: Haswell New Instructions (includes Advanced Vector Extensions 2 (AVX2), gather, BMI1, BMI2, ABM and FMA3 support) So my, albeit naive, thought process was that the optimizations could take advantage of these in general cases. For example, perhaps calls to the Random library could utilize the hardware-RNG on Ivy Bridge and later models.

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• Cannot dump svn repository

  - by vinga

  I've a problem with my svn repo. I cannot use it, I even cannot dump it. svnadmin verify repo returns Can't set position pointer in file 'svn/db/revs/0/0' When I try to dump repo (no matter what revision range), console output shows: * Dumped revision 0. svnadmin: Final line in revision file missing space I've googled that this may be connected with wrong version apr apache2 library, but I have other repositories which work good, so I thing this isn't the case. Is there any way to save at least some files from my repo? Can svn repo get corrupted so easily (probably after power-cut, however I'm not sure).

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• Linux, PHP, and mysqlnd?

  - by bob-the-destroyer

  Looks like most common distros build their PHP packages without mysqlnd, instead relying on the old libmysql library. Are there any distros that do include the new mysql native driver even as an option in any of their officially supported repositories? If not, is it possible (and if so, how) to rebuild these three (mysql, mysqli, & pdo_mysql) extensions without having to rebuild the entire PHP install? In my case, there are several PHP functions I need that are available only if these Mysql extenstions are built against mysqlnd. So I'd be fine installing a new OS to get these if the OS offers and supports it.

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• setreg.exe for Windows 7

  - by victoriah

  I want to use setreg.exe (http://msdn.microsoft.com/en-us/library/aa387700(VS.85).aspx) to disable the certificate revocation check. However, it's based on an older version of .NET than what I have. Microsoft says it's shipped with the older .net SDK, and when I download that, try to install, it says something like 'can't install SDK without .net 1.1'. In the article linked it says for newer versions I should use SignTool, but SignTool does not appear to have the function I need . Is it possible to either - a) find a tool that can perform the function I need that doesn't need me to install the older .NET b) get setreg.exe without downloading the SDK or do I need to install the older .NET on my machine? And if the latter is the case, what do I need to do to install an older .NET? Will it overwrite my current .NET? Thanks,

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• Application crashes when installing on Windows 7 but not on Windows XP

  - by JiBéDoublevé

  At my company, we're migrating from Windows XP to Windows 7. We've got 2 home made applications written in C# with the .NET framework 3.5. They use ClickOnce to be installed. We're in the test phase and the installation of these soft crashes on some Windows 7 machines and doesn't on others. The difference between these machines should be the configuration of the policies. The only error message we've got is this one: I tried to find some logs somewhere but there's nothing neither in the Event Viewer nor in the applications log (wich are poorly logged, then I'm not expecting miracle from this side :( ) These applications: work with FTP servers use WCF use old deprecated libraries (as I'm not at work, I'll edit this post when I'll have the info) use nHibernate 2 use LLBLGen use a deprecated Infragistics library export data into Excel files Did you encounter such an issue while migrating? Or do you have an idea where I should investigate on?

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• How to access internal network covered by a squid proxy from internet?

  - by Forbidden Overseer

  Our campus uses a squid proxy caching server with a basic authentication for all outbound requests coming from internal network. The whole network uses private IP range from 172.16.0.0 to 172.31.255.255. Most of our faculty websites and library websites are hosted on LAN. I want to access those faculty websites and other internal websites when I am outside the proxy (say when I am at my home and not in campus). I don't know whether I can use the same basic authentication from outside to access those LAN websites. Is there a way I can do that? I don't know whether our proxy server allows it or not, but if that's possible - I want to know how (how to set up browser etc.)?

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• Need to install just libswresample.so.0 on Centos 6 - how? (for FFMPEG)

  - by sprise

  I'm trying to get ffmpeg running on a Centos 6 machine and it has been uphill the whole way. I thought I had got it but when I go to use ffmpeg I get the error: ffmpeg: error while loading shared libraries: libswresample.so.0: cannot open shared object file: No such file or directory I looked in /usr/local/lib, which is where all the libraries are stored, and I do not have that exact file but I do have "libswresample.a". I gave up on the official FFMPEG Centos directions due to all kinds of issues and used yum to install. Where do I find the missing library and can I just put the file in my /usr/local/lib to fix? Thanks -- have a basic Linux understanding, more familiar with Ubuntu than Centos.

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• How to handle class dependency with interfaces and implementatons

  - by lealand

  I'm using ObjectAid with Eclipse to generate UML class diagrams for my latest Java project, and I currently have a handful of situations like this, where I have a dependency between two interfaces, as well as one of the implementations of one of the interfaces. Here, foo is the graphics library I'm using. In the previous example, FooCanvas draws ITexture objects to the screen, and both FooCanvas and its interface, ICanvas, take ITexture objects as arguments to their methods. The method in the canvas classes which cause this dependency is the following: void drawTexture(ITexture texture, float x, float y); Additionally, I tried a variation on the method signature using Java's generics: <T extends ITexture> void drawTexture(T texture, float x, float y); The result of this was a class diagram where the only dependencies where between the interfaces and the implementing classes, and no dependency by a canvas object on a texture. I'm not sure if this is more ideal or not. Is the dependency of both the interface and implementation on another interface an expected pattern, or is it typical and/or possible to keep the implementation 'isolated' from its interfaces dependencies? Or is the generic method the ideal solution?

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• Creating dynamic plots

  - by geoff92

  I'm completely new to web programming but I do have a programming background. I'd like to create a site that allows users to visit, enter some specifications into a form, submit the form, and then receive a graph. I have a few questions about this, only because I'm pretty ignorant: Is there a good framework I should start in? I know a lot of java, I'm okay with python, and I learned Ruby in the past. I figure I might use ruby on rails only because I hear of it so often and I think I've also heard it's easy. If anyone has some other recommendation, please suggest. The user will be entering data into a form. I'm guessing the request they'll be making should be one of a GET request, right? Because I don't intend for any of the data they're entering to modify my server (in fact, I don't intend on having a database). The data the user inputs will be used to perform calculations involving lots of matrices. I've written this functionality in python. If I use ruby on rails, should it be instead written in Ruby? Somewhere I've heard that you can either place the load of the work on your server or on the client's computer. Since the code performs heavy math, which option is preferable? How do I alter the setup to either make the client do the work or my server? Should I be using a "cgi-bin"? In the code that I have now, I use matplotlib, a python library, and then "show" the plot in order to see the graph. I specify the x and y limits, but I am able to "drag" the graph in order to see more data within the plot window. Ultimately, I want a graph to be shown on my site with the drag functionality. Is this possible? What if the client drags the graph so far, more computations must be made? Thanks!

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