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  • Simple Math Multiplayer game - is Ajax sufficient?

    - by Christian Strang
    I'm planning to create a simple math multiplayer game and I plan to just use Ajax for the server/client communication but I'm not sure if this is sufficient or if I need a socket server. The game will look like this: 2-4 users all get a simple math task (like: "37 + 14") they have to solve it as fast as possible first user who solves it is the winner I will track the time for each user, since the game started, on the client side and everytime a user gives an answer, the answer and the passed time will be send to the server. Additionally I'll add a function which will check every 3 seconds if the other users finished, how much time they needed and who won. Do you think this is possible just using Ajax? What alternatives are there?

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  • Mobile phone detection (brand, model, browser etc)

    - by SyaZ
    What do you use to detect visitor's mobile phone, down to the model if possible? Currently we maintain our own database but it's really getting behind due to lack of manpower to maintain it, so we decided to give 3rd party solution a try. These are my candidates but I don't have time to really try them all: DeviceAtlas - 1 year personal evaluation, but basic license is affordable. Their database look solid with daily update and user-contributed tests / updates. I am favoring this one at the moment. DetectRight - I was recommended this by a colleague but really can't find much from their site. 20k devices -- really? WURFL - Open source, database collaboratively derived from UAProf. So basically if you're going with UAProf solution, you're better off with WURFL. DetectMoBileBrowsers - This looks like the simplest of all. Too bad it's language dependent (PHP). Please share your experience or suggestions!

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  • Fix Windows MBR using Ubuntu Live CD

    - by kova
    I'm trying to fix the MBR using Ubuntu live CD. I already have the ms-sys installed but from the threads that I saw, I'm not completely sure in which /dev I should execute the command: sudo ms-sys --mbr7 /dev/??? (is it mbr7 the correct option when using Windows 7?) ubuntu@ubuntu:~$ sudo fdisk -l Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x1f205b1f Device Boot Start End Blocks Id System /dev/sda1 * 38 38 0 0 Empty /dev/sda2 * 2048 206847 102400 7 HPFS/NTFS/exFAT /dev/sda3 206848 155854847 77824000 7 HPFS/NTFS/exFAT /dev/sda4 155854848 625137663 234641408 7 HPFS/NTFS/exFAT ubuntu@ubuntu:~$ Why is /dev/sda1 empty? I'm trying to fix the MBR because I'm getting a black screen when trying to load the operating system.

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  • Changing balls direction in Pong

    - by hustlerinc
    I'm making a Pong game to get started with game-developement but I've run into a problem that i can't figure out. When trying to change the balls direction it doesn't change. This is the relevant code: function moveBall(){ this.speed = 2.5; this.direction = 2; if(this.direction == 1){ ball.X +=this.speed; } else if(this.direction == 2){ ball.X -=this.speed; } } function collision(){ if(ball.X == 500){ moveBall.direction = 2; } if(ball.X == 300){ moveBall.direction = 1; } } Why doesn't it work? I've tried many different ways, and none of them seem to work. The moveBall.direction changes though, since it alerts the new direction once it reaches the defined ball.X position. If someone could help me I would deeply appreciate it. I've included a JSFiddle link. http://jsfiddle.net/hustlerinc/y4wp3/

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  • How do I get Picasa 3.9 to play .MOV files?

    - by user44405
    I have been using Picasa for years, first in XP then in Ubuntu from 8.04 onwards & now in Lubuntu 11.10. For 11.10, I downloaded Picasa3.9.0 from FileHippo & installed it in Wine. Everything works well, except it doesn't play videos from my camera - it just shows a thumbnail - whereas earlier versions played videos OK. The videos appear as **.MOV (QuickTime video) in file manager, & can be played by, for instance, GNOME MPlayer or Movie Player (but not properly by Banshee...). Is there some simple way of getting Picasa 3.9 to play them?

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  • Copying and pasting files. Nothing new here

    - by Blake Wood
    I installed XBMC and it's working beautifully. I have my own skin I'd like to use and all I should have to do is copy and past my skin.folder into the addons folder and I'm down. However, this isn't so easy with Ubuntu. I have the latest version, installed today 11-14-2012 Could someone please spell out the command process to make this happen? I've read through so many forums, tried ssh, I know now I'm getting into things that could be dangerous so any help would be much appreciated. Structure. /home/cantrellsmedia/Downloads/skin.cantrell <----- Need copied /usr/share/xbmc/addons/ <-------- Paste Some of what I have tried cp skin.cantrell mv skin.cantrell~/usr/share/xbmc/addons/

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  • Extremely slow transfer speed ubuntu -> Windows

    - by Hailwood
    I have two laptops, One is running Ubuntu 12.04 (EXT4) the other is running Windows 7 (NTFS). I am copying over 40gb of data (one file) from the Ubuntu laptop to the Windows Laptop. (Browse the shared folder on Ubuntu using Windows copy/paste) But I am getting transfer speeds topping out at ~700kb/s Surely this is not right. I am transferring via wifi on both laptops. My download speeds can reach 7-8mb/s on both laptops, so I know it is not the wifi cards or the router topping out. wlan0 Link encap:Ethernet HWaddr 84:4b:f5:db:b4:85 inet addr:192.168.1.66 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::864b:f5ff:fedb:b485/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:11941185 errors:0 dropped:0 overruns:0 frame:0 TX packets:11306693 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:10087111370 (10.0 GB) TX bytes:7843524888 (7.8 GB)

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  • Is it needed to have your blog title and description in H1 and H2

    - by Saif Bechan
    I have read an article that states that it is not necessary to have your blog title and description on your website at all. Just have the titles of the posts in h1, on the index and the post page. And on the post page have your different sections started with h2. Widget headers start with h3. Title and description are most of the time in the logo image. I have looked at the source of my favorite blog, http://net.tutsplus.com, and I see they do the same. Is this recommended?

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  • A Basic Thread

    - by Joe Mayo
    Most of the programs written are single-threaded, meaning that they run on the main execution thread. For various reasons such as performance, scalability, and/or responsiveness additional threads can be useful. .NET has extensive threading support, from the basic threads introduced in v1.0 to the Task Parallel Library (TPL) introduced in v4.0. To get started with threads, it's helpful to begin with the basics; starting a Thread. Why Do I Care? The scenario I'll use for needing to use a thread is writing to a file.  Sometimes, writing to a file takes a while and you don't want your user interface to lock up until the file write is done. In other words, you want the application to be responsive to the user. How Would I Go About It? The solution is to launch a new thread that performs the file write, allowing the main thread to return to the user right away.  Whenever the file writing thread completes, it will let the user know.  In the meantime, the user is free to interact with the program for other tasks. The following examples demonstrate how to do this. Show Me the Code? The code we'll use to work with threads is in the System.Threading namespace, so you'll need the following using directive at the top of the file: using System.Threading; When you run code on a thread, the code is specified via a method.  Here's the code that will execute on the thread: private static void WriteFile() { Thread.Sleep(1000); Console.WriteLine("File Written."); } The call to Thread.Sleep(1000) delays thread execution. The parameter is specified in milliseconds, and 1000 means that this will cause the program to sleep for approximately 1 second.  This method happens to be static, but that's just part of this example, which you'll see is launched from the static Main method.  A thread could be instance or static.  Notice that the method does not have parameters and does not have a return type. As you know, the way to refer to a method is via a delegate.  There is a delegate named ThreadStart in System.Threading that refers to a method without parameters or return type, shown below: ThreadStart fileWriterHandlerDelegate = new ThreadStart(WriteFile); I'll show you the whole program below, but the ThreadStart instance above goes in the Main method. The thread uses the ThreadStart instance, fileWriterHandlerDelegate, to specify the method to execute on the thread: Thread fileWriter = new Thread(fileWriterHandlerDelegate); As shown above, the argument type for the Thread constructor is the ThreadStart delegate type. The fileWriterHandlerDelegate argument is an instance of the ThreadStart delegate type. This creates an instance of a thread and what code will execute, but the new thread instance, fileWriter, isn't running yet. You have to explicitly start it, like this: fileWriter.Start(); Now, the code in the WriteFile method is executing on a separate thread. Meanwhile, the main thread that started the fileWriter thread continues on it's own.  You have two threads running at the same time. Okay, I'm Starting to Get Glassy Eyed. How Does it All Fit Together? The example below is the whole program, pulling all the previous bits together. It's followed by its output and an explanation. using System; using System.Threading; namespace BasicThread { class Program { static void Main() { ThreadStart fileWriterHandlerDelegate = new ThreadStart(WriteFile); Thread fileWriter = new Thread(fileWriterHandlerDelegate); Console.WriteLine("Starting FileWriter"); fileWriter.Start(); Console.WriteLine("Called FileWriter"); Console.ReadKey(); } private static void WriteFile() { Thread.Sleep(1000); Console.WriteLine("File Written"); } } } And here's the output: Starting FileWriter Called FileWriter File Written So, Why are the Printouts Backwards? The output above corresponds to Console.Writeline statements in the program, with the second and third seemingly reversed. In a single-threaded program, "File Written" would print before "Called FileWriter". However, this is a multi-threaded (2 or more threads) program.  In multi-threading, you can't make any assumptions about when a given thread will run.  In this case, I added the Sleep statement to the WriteFile method to greatly increase the chances that the message from the main thread will print first. Without the Thread.Sleep, you could run this on a system with multiple cores and/or multiple processors and potentially get different results each time. Interesting Tangent but What Should I Get Out of All This? Going back to the main point, launching the WriteFile method on a separate thread made the program more responsive.  The file writing logic ran for a while, but the main thread returned to the user, as demonstrated by the print out of "Called FileWriter".  When the file write finished, it let the user know via another print statement. This was a very efficient use of CPU resources that made for a more pleasant user experience. Joe

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  • Functional Programming - Does Knowing It Help Job Prospects?

    - by Jetti
    The main language that I use at the moment is C# and I am the most comfortable with it. However, I have started dabbling in F# and Haskell and really enjoy those langauges. I would love to improve my skills in either of those languages over time since it truly is fun for me to use them (as opposed to Ruby, which is hyped as "fun", I just don't get where the fun is, but I digress...). My question is directed at those who have hired/interviewed for programming positions (junior/mid-level): if you see a functional programming language on a resume, does it affect your opinion (whether positive or negatively) of that candidate? My rationale for knowledge of functional programming affecting the view of a candidate is because it can show that the candidate can adapt to different methodologies and take a mulit-dimensional approach to problems rather than the "same old OO approach". (This may be off-base, please let me know if this assumption is as well!)

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  • SEO blog Indexing: wordpress.com subdomain vs a registered domain?

    - by rumspringa00
    I've used WordPress for a few of my client's sites, mostly small businesses and eCommerce sites. I have found through Google Analytics as well as the All in One Webmaster plugin that when it comes to social media, using WordPress is a surefire way of getting your site indexed by Google and occasionally Bing and Yahoo. Since I am a heavy WP user, I'd like to contribute by registering a dot WordPress domain for my portfolio. When using a WP installation concurrently with a WP domain, e.g. myportfolio.wordpress.com, will the site be more or less likely to be indexed rather a generic myportfolio.com domain? I've seen mixed opinions where people seem to favor a WP domain for URL output where others say that it's a moot point, and that Google will not favor a WP domain over a dot com domain as long as your meta tags are updated and content is keyword optimized. I tend to disagree and believe a WP domain would more likely be indexed and output more URLs over an individual, laconic domain like myportfolio.com. Am I wrong?

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  • Why are we being twitter spammed?

    - by Tom Gullen
    This is a search relating to us: https://twitter.com/#!/search/realtime/scirra We're getting a of of new accounts tweeting: The Layers Bar - Scirra.com Firstly this is not us doing it as we're quite proud of doing everything completely whitehat. Also this tweet doesn't make any sense, "The Layers Bar" seems to be referring to a manual entry of ours. They all seem to be new accounts with no followers and no prior tweets coming in like clockwork every hour. Does anyone know why this could be happening? Could this harm us? It it possible to find out the source of this? I should mention I'm hesitant to report them all as spam because it could look like we are the culprits.

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  • Dynamic Quad/Oct Trees

    - by KKlouzal
    I've recently discovered the power of Quadtrees and Octrees and their role in culling/LOD applications, however I've been pondering on the implementations for a Dynamic Quad/Oct Tree. Such tree would not require a complete rebuild when some of the underlying data changes (Vertex Data). Would it be possible to create such a tree? What would that look like? Could someone point me in the correct direction to get started? The application here would, in my scenario, be used for a dynamically changing spherical landscape with over 10,000,000 verticies. The use of Quad/Oct Trees is obvious for Culling & LOD as well as the benefits from not having to completely recompute the tree when the underlying data changes.

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  • New to CG shader programming, what program should I use to write and test them?

    - by Notbad
    I have started witting some shaders. First ones were fairly easy to write in notepad but now I need something with a bit more meat. I have checked rendermonnkey that seems to support CG but it is really old and don't know if it is a good option. On the other hand there exist this FX Composer 2.0 but it seems somthing that could really distract me from learning shaders because it seems a pretty deep program. Are there any other possibilities? There's a really nice alternative to write shaders named ShaderToy but just supports GLSL. Any information will be really welcomed. Thanks in advance.

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  • SDL2 with OpenGL -- weird results, what's wrong?

    - by ber4444
    I'm porting an app to iOS, and therefore need to upgrade it to SDL2 from SDL1.2 (so far I'm testing it as an on OS X desktop app only). However, when running the code with SDL2, I'm getting weird results as shown on the second image below (the first image is how it looks with SDL, correctly). The single changeset that causes this is this one, do you see something obviously wrong there, or does SDL2 have some OpenGL nuances I'm unaware of? My SDL is based on changeset dd7e57847ea9 from HG (since then there is one "Allow specifying of OpenGL 3.2 Core Profile on Mac OS X" commit, not sure if that would help).

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  • How to write efficient code in spite of heavy deadlines

    - by gladysbixly
    Hi all, I am working in an environment wherein we have many projects with strict deadlines on deliverables. We even talk directly to the clients so getting the jobs done and fast is a must. My issue is that i'd always write code for the first solution that comes to my mind, which of course I thought as best at that moment. It always ends up ugly though and i'd later realize that there are better ways to do it but can't afford to change due to time restrictions. Are there any tips by which I could make my code efficient yet deliver on time?

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  • 5 Things SQL Server should get rid of

    - by Jonathan Kehayias
    Paul Randal ( blog | twitter ) started a new meme last night with his blog post " What 5 things should SQL Server get rid of? " A few bloggers have posted their top 5 lists, so here is mine. Creating Foreign Keys without mentioning Indexes This is probably a performance tuning consultants favorite.  I know that Greg Low has blogged about this in the past (see Indexing Foreign Keys - should SQL Server do that automatically? ) and back then, and now I still do think this should be an...(read more)

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  • SharePoint 2010 Diagnostic Studio Remote Diag

    - by juanlarios
    I have had some time this week to try out some tools that I have been meaning to try out. This week I am trying out the SP 2010 Diagnostic Studio. I installed it successfully and tried it on my development evironment. I was able to build a report and a snapshot of the environment. I decided to turn my attention to my Employer's intranet environment. This would allow me to analyze it and measure it against benchmarks. I didn't want to install the Diagnostic studio on the Production Envorinment, lucky for me, the Diagnostic studio can be run remotely, well...kind of. Issue My development environment is a stand alone, full installation of SharePoint 2010 Server. It has Office 2010, SQL 2008 Enterprise, a DC...well you get the point, it's jammed packed! But more importantly it's a stand alone, self contained VM environment. Well Microsoft has instructions as to how to connect remotely with Diagnostic Studio here. The deciving part of this is that the SP2010DS prompts you for credentails. So I thought I was getting the right account to run the reports. I tried all the Power Shell commands in the link above but I still ended up getting the following errors: 06/28/2011 12:50:18    Connecting to remote server failed with the following error message : The WinRM client cannot process the request...If the SPN exists, but CredSSP cannot use Kerberos to validate the identity of the target computer and you still want to allow the delegation of the user credentials to the target computer, use gpedit.msc and look at the following policy: Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Allow Fresh Credentials with NTLM-only Server Authentication.  Verify that it is enabled and configured with an SPN appropriate for the target computer. For example, for a target computer name "myserver.domain.com", the SPN can be one of the following: WSMAN/myserver.domain.com or WSMAN/*.domain.com. Try the request again after these changes. For more information, see the about_Remote_Troubleshooting Help topic. 06/28/2011 12:54:47    Access to the path '\\<targetserver>\C$\Users\<account logging in>\AppData\Local\Temp' is denied. You might also get an error message like this: The WinRM client cannot process the request. A computer policy does not allow the delegation of the user credentials to the target computer. Explanation After looking at the event logs on the target environment, I noticed that there were a several Security Exceptions. After looking at the specifics around who was denied access, I was able to see the account that was being denied access, it was the client machine administrator account. Well of course that was never going to work!!! After some quick Googling, the last error message above will lead you to edit the Local Group Policy on the client server. And although there are instructions from microsoft around doing this, it really will not work in this scenario. Notice the Description and how it only applices to authentication mentioned? Resolution I can tell you what I did, but I wish there was a better way but I simply don't know if it's duable any other way. Because my development environment had it's own DC, I didn't really want to mess with Kerberos authentication. I would also not be smart to connect that server to the domain, considering it has it's own DC. I ended up installing SharePoint 2010 Diagnostic Studio on another Windows 7 Dev environment I have, and connected the machien to the domain. I ran all the necesary remote credentials commands mentioned here. Those commands add the group policy for you! Once I did this I was able to authenticate properly and I was able to get the reports. Conclusion   You can run SharePoint 2010 Diagnostic Studio Remotely but it will require some specific scenarions. A couple of things I should mention is that as far as I understand, SP2010 DS, will install agents on your target environment to run tests and retrieve the data. I was a Farm Administrator, and also a Server Admin on SharePoint Server. I am not 100% sure if you need all those permissions but I that's just what I have to my internal intranet.   I deally I would like to have a machine that I can have SharePoint 2010 DIagnostic Studio installed and I can run that against client environments. It appears that I will not be able to do that, unless I enable Kerberos on my Windows 7 Machine now. If you have it installed in the same way I would like to have it, please let me know, I'll keep trying to get what I'm after. Hope this helps someone out there doing the same.

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  • Google Maps in .NET Problem

    - by H(at)Ni
    Hello, I've been struggling with Google maps till I found that someone implemented a wrapper so that you can use Google Map as an ASP.Net user control which is a great effort indeed. You can download it from this link. However, after using it for a while, I've found out that it is storing the Google map object only once in the session and getting it from there whenever needed which was a problem for me that when you update the map in some page, you'll find it updated on another page. So, I've digged deep in the code and updated it so that it stores the map object with a unique identifier that you set it as a property in the user control object like that: this.googleMapCtrl.ControlID = Guid.NewGuid().ToString(); You can download the updated control files from here. Cheers,

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  • How to Access Metro Apps from Windows Explorer in Windows 8

    - by Taylor Gibb
    Windows 8 comes with its new Metro Start Screen, which makes it easy to launch your Metro apps from that screen, but did you know you can access them from Windows Explorer too? Here’s how to do it. To get started you need to create a shortcut, so right-click on the desktop, and choose New –>  Shortcut. When you are asked for the location of the item, use the following: The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos

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  • How to Name Groups of Apps on the Windows 8 Metro Start Screen

    - by Taylor Gibb
    The Windows 8 Start Screen certainly takes some getting use to, however, one of the things that I really miss about the Start Menu was how i was able to categorize my installed applications. While you cant create folders on the Start Screen, you can group your applications. To get started head over to the Metro Start Screen and move your mouse to the bottom right-hand corner, clicking on the small icon. Now right click on the group of apps that you want to name. Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos HTG Explains: What Can You Find in an Email Header?

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  • I studied electrical engineering. Can I work as a developer? [closed]

    - by FailedDev
    A while ago I finished my Msc in Electrical Engineering and started working as an engineering consultant where I mostly do development work. I am good at picking up languages/technologies tools. I have fiddled with C/C++/C#/perl/ant/bash/html/css etc. Although I have never had a complain for my work, rather the contrary, I just feel that some day, someone will ask me a real hard task which would maybe seem rather trivial for a computer scientist but hard for me. Should I read/do something to become a better developer. Should I pick up a book about design patterns or algorithms for example? Is this normal that I have this kind of "fear"? Sorry if this is the wrong place to post this question. Please notify me so I can close it if this is the case.

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  • Developing OpenGLES2 apps for Ubuntu Software Center

    - by Bram
    I have a game for iOS and Android that I now want to port to Ubuntu. I plan to distribute it with Ubuntu Software Center. Preferrably for free with an in-app-purchase. My codebase is currently based on OpenGL ES2 and written in C++. I could rewrite to OpenGL, but having progammable shaders is a must. Fixed pipeline OpenGL will not suffice. Is there a feature in place that lets you specify OpenGL requirements in the Ubuntu Software Center? I want to make sure that only Ubuntu users with compatible hardware will be able to download my game. Any APIs I could use for getting a suitable OpenGL context, or am I expected to just use glx for this? Or is the use of GTK mandatory?

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  • New videos available #dax #ssas #powerpivot

    - by Marco Russo (SQLBI)
    The collaboration I and Alberto started with Project Botticelli is starting producing content. At this point we have three videos available: DAX in Action shows the power of DAX in PowerPivot solving common patterns not so easy or fast to solve in other languages DAX: Calculated Columns vs. Measures shows the difference between calculated columns and measures in DAX Introduction to DAX has a content corresponding to the title! The first two videos are freely available, the third one is longer and visible only to subscribers. The goal for this series of video is to reach advanced Excel users and BI developers that are new to DAX. If we should categorize this content, it’s a sort of level 200 session in a conference. I don’t expect readers of this blog to watch this video (if not for the sake of curiosity!) but if you have to explain this subject to anyone else and you have other priorities… well, you can add this post to the list of resources you provide for studying the subject!

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  • 'module' object has no attribute 'PY2'

    - by ManikandanV
    I am using ubuntu 14.04, was trying to install python-memcache. I have got an error like Downloading/unpacking python-memcached Downloading python-memcached-1.53.tar.gz Cleaning up... Exception: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main status = self.run(options, args) File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 278, in run requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle) File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1229, in prepare_files req_to_install.run_egg_info() File "/usr/lib/python2.7/dist-packages/pip/req.py", line 292, in run_egg_info logger.notify('Running setup.py (path:%s) egg_info for package %s' % (self.setup_py, self.name)) File "/usr/lib/python2.7/dist-packages/pip/req.py", line 284, in setup_py if six.PY2 and isinstance(setup_py, six.text_type): AttributeError: 'module' object has no attribute 'PY2' Storing debug log for failure in /home/mani/.pip/pip.log I am getting the same error when installing Django-celery, pymongo etc

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