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• Pull/push student assignment files from computer lab computers (Windows 7)

  - by mkstreet

  I have a computer lab with about 35 PC's all running Windows 7. The students do their work and save it on the D-drive in a particular folder such as a folder with the same name as the computer's name (e.g. LABPC001). I'd like a centralized way to pull all these folders in to the teacher's computer in the lab to check the assignments. It would be best if this didn't involve using an external website (e.g. Dropbox). I would also like to be able to distribute (send) files to the students in these same folders. I've seen software applications that do this but they cost about US$1000 which is far beyond our means. Suggestions for free, or almost free, best ways to set this up?

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• What language should an 11-year old start with to learn game programming?

  - by emsr

  I have a 11-year old son who wants to do game programming. I've started him on C++ (C++11) and he's learned iostreams, looping, functions, logic and flow control. I'm using the standard library and no memory management at all. But I would like to ask: What language would you suggest for a pre-teen (Python, ...)? What books would you suggest? We looked at one book that was just for console ASCII games. I liked the C++ that it taught but I think he'll get bored without some graphics at some point.

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• Suggestion for a Non-CSE developer

  - by Md.lbrahim

  Due to financial problems, I couldn't go for CSE in my country and had to settle for a BCIS honors degree. Now, after quite some time, when I want to go for a higher position in software development then I get asked about algorithms and basics that I have missed back in uni. This is affecting my chances of getting selected and I cannot afford that any longer. My question would be that what you would suggest smn like me to do in order to cover the 'basics' without any university or educational institute e.g. books,learn C++,etc? Any suggestion (including -ve) is welcomed and appreciated.

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• How to get some experience in a new programming language? [closed]

  - by BeCool

  I have commercial experience in one programming language but I want to make a switch to another programming language (C#/.NET). I am in full-time employment so whenever I get free time I read relevant books or use online resources available. My questions are - How do I develop experience in the new language of interest (without leaving current job)? The best way I find to learn is to develop a project - How do you / Where can you find new test projects which you can refer to in the interview (these don't have to be real projects but perhaps I can take the code with me in a usb stick as proof). Do you have any tips/advice for me regarding best way to switch career? My lanugauge of choice is C# - so c# related answers will be appreciated.

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• Applications getting killed automatically

  - by nebi

  I am running httperf client on my m/c and after few seconds it is getting killed. dmesg shows: The command is: httperf --hog --client=0/1 --server=39.0.0.2 --port=80 --uri=/50kb --rate=20000 --send-buffer=4096 --recv-buffer=16384 --num-conns=6000000 --num-calls=1 Although I had done this test no. of times but never faced this error any time. From last two days I am observing this. My Ubuntu version is ubuntu 10.04. and httperf version is httperf-0.9.0 [ 2997.180620] Out of memory: kill process 7977 (apache2) score 70532 or a child [ 2997.180632] Killed process 7977 (apache2) [ 2997.184837] Out of memory: kill process 7971 (rsyslogd) score 8702 or a child [ 2997.184844] Killed process 7971 (rsyslogd) [ 2997.188823] Out of memory: kill process 7978 (apache2) score 1354 or a child [ 2997.188829] Killed process 7978 (apache2) [ 2997.192817] Out of memory: kill process 7973 (atd) score 561 or a child [ 2997.192822] Killed process 7973 (atd) [ 2997.196805] Out of memory: kill process 8102 (httperf) score 471 or a child [ 2997.196811] Killed process 8102 (httperf) Output of free command: total used free shared buffers cached Mem: 3862768 163000 3699768 0 2384 13068 -/+ buffers/cache: 147548 3715220 Swap: 3905528 0 3905528

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• Thunderbird: "Could not initialize the application's security component" [closed]

  - by user unknown

  In Thunderbird, on startup, I get the error message: "Could not initialize the application's security component" The message continues to check permissions of the profile, and free disk space. df -h shows, that I have 19G free disk space. find . -not -perm -644 -not -perm -600 -ls shows: No file without rw-permissions for me. Before the error occured, thunderbird worked well. But I changed my main mail-account. I had two, let's call them A and B, and used mainly A, but now I wanted to deaktivate it, and receive and send automatically via the second. I Had problems moving the filters from inbox A to inbox B (missing copy-functionality). In the web, I found (mollazine) hints, to move key3.db, cert8.db and secmode.db out of the way, but it didn't work for me. Another hint was to uninstall Quickcam(?. sic!), but I don't have Quickcam. A third to recreate the profile, but I have subdirectories, filters, addressbook, groups - mails back to the year 2003. I don't want to risk the loss of data. The whole errormessage is: Could not initialize the application's security component. The most likely cause is problems with files in your application's profile directory. Please check that this directory has no read/write restrictions and your hard disk is not full or close to full. It is recommended that you exit the application and fix the problem. If you continue to use this session, you might see incorrect application behaviour when accessing security features. When I open the error-console, it is empty.

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• Any good site that teaches C++?

  - by Shinmaru

  I am searching for any good site that teaches C++, that can explain most to all things about it(general) and has a decent active community. About Me: I am new to programming(knows nothing of it, so please bare with me), I have only learned(to a very basic form) LUA scripting Language, so yes I am your complete newbie. I got interested in programming, from scripting in LUA, so you can say it was my small stepping stone, One would basically take a course in college, but not everyone is well funded for that and I can't buy books for the same said reason(yes I'm somewhat poor, only money for essentials and bills), I'm not trying to get sympathy, just stating my conditions. and Please, something in between the lines of 'Programming for Dummies'(I'm not the brightest crayon in the box), I know this will not be easy, but your help will be most appreciated. I would learn for either Windows and/or Linux/Unix. I use both. Site(s) I know: Cplusplus.org(quite inactive and tutorials are a little for the programming savvy.

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• Windows 8 on iSCSI with LIO target: thin provisioning

  - by LubosD

  I have installed Windows 8.1 on an iSCSI target. This target is provided by Linux LIO and is backed by a sparse file. One of the reasons I created such an installation was thin provisioning. In other words, when I free disk space on Windows, LIO should punch holes into the file, thus free storage space on the Linux server as well. I have checked my kernel's sources and the SCSI UNMAP command is really supported for file-backed targets. On the other hand, deleting files on Windows doesn't lower the amount of space taken by the backing file on Linux (checked with du). Actually, the backing file sometimes grows even more. Some sources on Google say Win8 should support UNMAP/DISCARD on iSCSI, but even in Wireshark I only see ordinary read and write commands when files are being deleted. Any way to fix or troubleshoot it?

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• What can I do in order to inform users of potential errors in my software in order to minimize liability?

  - by phobitor

  I'm an independent software developer that's spent the last few months creating software for viewing and searching map data. The software has some navigation functionality as well (mapping, directions,etc). The eventual goal is to sell it in mobile app markets. I use OpenStreetMap as my data source. I'm concerned about liability for erroneous map data / routing instructions, etc that might result when someone uses the application. There are a lot of stories on the internet where someone gets into an accident or gets stuck or gets lost because of their GPS unit/Google Maps/mapping app... I myself have come across incorrect map data as well in a GPS unit I have in my car. While I try to make my own software as bug free as possible, no software is truly bug free. And moving beyond what I can control, OpenStreetMap data (and street map data in general) is prone to errors as well. What steps can I take to clearly inform the user that results from the software aren't always perfect, and to minimize my liability?

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• How can WiFi access points recognize me?

  - by stephanos

  Due to heavy snowfall I was recently stranded on an airport. Having to do some surfing on my laptop I found an open access point. It offered 30 minutes of free surfing a day. I registered and used up my time. Then I wanted to see if I could use it again - mostly just for the fun of it. I opened a different browser then before and tried to register again. It didn't work. The access point recognized me and told me that I'd have to wait another day to get 30 free minutes again. I reconnected again to force a new IP - still the same. How did it recognize me?

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• How to open-source a project whose git repository has copyrighted media in the history?

  - by phyzome

  I want to release an audio fingerprinting software project under a free license, but the repository contains copyrighted audio files. The test cases also currently use these files. How do I release the code to the public with maximum version history but without violating copyright? Details: The code is versioned under git. We will collapse it all back into one branch before release. There are 400 MB of audio data. Some files are free-licensed music from e.g. Jamendo, others are MP3s from our personal collections. No matter what approach we take, we'll always keep an immutable copy of the original repo, so as not to destroy project history. Main question: How to handle the public release? Expunge all history of the files in question from the git repository and release the altered repo. (v64 pointed out a way to do this.) Alternatively, take a snapshot of the current state of the code and don't even bother having a public history of the pre-release code. Side question: How could we have avoided this dilemma in the first place, given that sometimes private code or media is needed for the early stages of a project?

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• Need Advice: What to program?

  - by newbie

  Good day! Our professor asked us to create a Web-based program using JSP and JDBC. The problem is I don't have any idea what to program. We have 5 days to create the program and I am searching websites like hotel reservation system, library catalogue system, Amazon, etc but I think it is too big for 5 days (and I am just a beginner). Can anyone give me an idea what is suitable project for beginners to start with? (Note: Address Books / ATM Transactions are not allowed). Do you have sample website so I have a reference? Thank you.

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• EXC_BAD_ACCESS error when box2d joint is destroyed

  - by colilo

  When I destroy the weldJoint in the update method (see below) I get an EXC_BAD_ACCESS error pointing to the line world->DestroyJoint(weldJoint); in the update method below: -(void) update: (ccTime) dt { int32 velocityIterations = 8; int32 positionIterations = 1; // Instruct the world to perform a single step of simulation. It is // generally best to keep the time step and iterations fixed. world->Step(dt, velocityIterations, positionIterations); // using the iterator pos over the set std::set<BodyPair *>::iterator pos; for(pos = bodiesForJoints.begin(); pos != bodiesForJoints.end(); ++pos) { b2WeldJointDef weldJointDef; BodyPair *bodyPair = *pos; b2Body *bodyA = bodyPair->bodyA; b2Body *bodyB = bodyPair->bodyB; weldJointDef.Initialize(bodyA, bodyB, bodyA->GetWorldCenter()); weldJointDef.collideConnected = false; weldJoint = (b2WeldJoint*) world->CreateJoint(&weldJointDef); // Free the structure we allocated earlier. free(bodyPair); // Remove the entry from the set. bodiesForJoints.erase(pos); } for(b2Body *b = world->GetBodyList(); b; b=b->GetNext()) { if (b->GetUserData() != NULL) { CCSprite *mainSprite = (CCSprite*)b->GetUserData(); if (mainSprite.tag == 1) { mainSprite.position = CGPointMake( b->GetPosition().x * PTM_RATIO, b->GetPosition().y * PTM_RATIO); CGPoint mainSpritePosition = mainSprite.position; if (mainSprite.isMoved) { world->DestroyJoint(weldJoint); } } } } } In the HelloWorldLayer.h I set the weldJoint with the assign property. Am I destroying the joint in the wrong way? I would really appreciate any help. Thanks

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• How to deal with OOP design problems in interviews?

  - by haps10

  This is a question where I seek guidance from fellow/senior developers to get into my dream company - it's a pioneer in OOP and Agile. I've already failed once to clear an interview. One part I feel most challenging is to come up with a proper Object Oriented design(classes, interfaces, methods, interactions etc.) in a very short time for certain situations like Pacman, Game Of Life and so on. As the problems are unprecedented ones - my approach is mostly to try different things and then make decisions - which they feel is not clear and not what they expect from a developer with 5+ years of experience. I've already studied a few books on patterns, OOP - it didn't help me much and I think it'll take a bit more than that. Could some one please guide on what specifically shall I practice so that I can do better at design problems as above. I want to refine my approach and have a better thought process.

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• Move 2TB Win7x64 to 640GB HDD

  - by reedacus25

  Basically I just got a new (refurbished) HP H8-1260t to use for Windows Media Center. The shipping drive is a 2TB Hitachi drive, but I have an older and barely used 640GB WD Caviar Blue 7200RPM drive I would like to move my Windows install to. I have about 750GB of data with over 1TB free left on the drive. Having googled my heart and fingers out, I would think that I can shrink my partition down to the size it is full at now with over 1TB free for a second partition where I can move my media files to further shrink my boot partition so that I can fit a system image smaller than 640GB on that WD drive. I want to have a separate drive for Media and TV Recordings from my boot disk. Does this sound like the easiest method for me? Or am I doing this all wrong. Help appreciated.

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• ubuntu precise high hard drive I/O

  - by pavolzetor

  on ubuntu precise, all apps starts slowly, and my hard drive is all time in use. What is the cause? it was never before, even nautilus takes a lot time to load, boot is also slower. top - 18:37:05 up 1:07, 1 user, load average: 2.03, 2.34, 2.25 Tasks: 182 total, 1 running, 180 sleeping, 0 stopped, 1 zombie Cpu(s): 30.2%us, 7.2%sy, 1.4%ni, 53.9%id, 7.1%wa, 0.0%hi, 0.2%si, 0.0%st Mem: 3941576k total, 3522048k used, 419528k free, 50156k buffers Swap: 0k total, 0k used, 0k free, 1827640k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2508 pk 20 0 1018m 189m 28m S 4 4.9 22:28.04 plugin-containe 1290 root 20 0 82336 16m 1492 S 2 0.4 0:04.41 landscape-clien 1305 root 20 0 97280 22m 5584 S 2 0.6 0:01.57 landscape-manag 4201 pk 20 0 17328 1312 924 R 2 0.0 0:00.02 top 1 root 20 0 24436 2364 1268 S 0 0.1 0:00.68 init 2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0 0.0 0:00.45 ksoftirqd/0 6 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0 7 root RT 0 0 0 0 S 0 0.0 0:00.02 watchdog/0 8 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/1 10 root 20 0 0 0 0 S 0 0.0 0:00.43 ksoftirqd/1 12 root RT 0 0 0 0 S 0 0.0 0:00.01 watchdog/1 13 root 0 -20 0 0 0 S 0 0.0 0:00.00 cpuset

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• Please help me debug this little C program on dynamic two-dimensional array? [migrated]

  - by azhi

  I am a newbie here. I have written a little C program, which is to create a two-dimensional matrix. Here is the code: #include <stdio.h> #include <stdlib.h> int **CreatMatrix(int m,int n){ int **Matrix; int i; Matrix=(int**)malloc(m*sizeof(int*)); for(i=0;i<m;i++){ Matrix[i]=(int*)malloc(n*sizeof(int)); } return Matrix; } int main(){ int m,n; int **A; printf("Please input the size of the Matrix: "); scanf("%d%d",&m,&n); A=CreatMatrix(m,n); printf("Please input the entries of the Matrix, which should be integers!\n"); int i,j; for(i=0;i<m;i++){ for(j=0;j<n;j++){ scanf("%d",&A[i][j]); } } printf("The Matrix that you input is:\n"); for(i=0;i<m;i++){ for(j=0;j<n;j++){ printf("%3d ",A[i][j]); } printf("\n"); } for(i=0;i<m;i++) free(A[i]); free(A); } I have run it, and it works fine. But I am not sure if it is right? Can anyone help me debug it?

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• Game Development

  - by Sundareswaran Senthilvel

  I'm planning to write a game from scratch (a BIG Game, for commercial purpose). I'm aware that there are certain compute libraries like OpenCL, AMD APP SDK, C++ AMP as well as DirectCompute - both from MS (NOT interested in CUDA) are available in the market. I'm planning to write the game from the scratch, which includes the following engines... 1.Physics Engine 2.AI Engine 3.Main Game Engine (... and if anything is missed). I'm aware that, there are some free physics engine libraries in the market. Not sure about free AI engine libraries. I'm bit confused in choosing between the OpenCL, AMD APP SDK, and C++ AMP libraries (as already mentioned i'm NOT interested in CUDA). I want my game to be published in Windows/Android/Mac OSX. It means it should be a cross-platform game. I will be having "one source code" that i'll compile for various platforms like Windows/Android/Mac OSX, and any others if i missed. Note: Since I'm NOT a Java guy, kindly do NOT suggest me the Java Language. For Graphics language should i use OpenGL or DirectX 11? I have heard that OpenGL runs on a single core, and not sure of DirectX 11. Between OpenGL and DirectX which one should i follow? or else, are there any other graphics language that i need to start with? I want to make use of the parallelism in GPU as well as CPU.

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• SQL and Database: Where to start! [closed]

  - by Nizar

  First of all I just know HTML and CSS (this is my background in web development and design) and I have found that before I move to a server-side language I need to learn about databases and SQL. My first question: Do you think this order of learning is good (I mean to learn SQL after HTML and CSS)? My secod related question: Do I have to learn a lot about SQL and databases? or just the basics? and if you know any good beginners books please write their titles.

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• How can I install Ubuntu's 10.10 kernel I Ubuntu 12.10?

  - by user103533

  I did use Ubuntu 10.10 for a long time, and now I replaced it with Ubuntu 12.10, every thing works great, but I do have one little problem, which is with my wireless card. On Ubuntu 10.10, it worked PERFECTLY, and it even worked better than in windows 7, so I was very happy with Ubuntu 10.10, but, like I said, after installing 12.10, my wireless card doesn't work any more, so I heard that KERNELS are the reason for that. Are kernels the reason for my wireless not working now? If yes then please teach me how to remove my current kernels and install 10.10 kernels. I went to -Additional Drivers- and i found something very weird i took picture and this is what it look like "apply changes" Button NOT active so i can't install driver :( anyway... my Wireless card is WL-138g v2 (remember on Ubuntu 10.10 it was WORKING 100% normally and FREE i did NOT pay for it driver) so... now what shall i do ? it is saying in picture // Using Non-Free firmware for linux kernel drivers from linux-firmware-nonfree (proprietary) // BTW i did "rfkill list" but NO-thing appear under that command.

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• Matrix camera, movement concept

  - by NoFace

  I was talking to some guy. He said that my movement concept in game is bad. When left or right arrow is pressed I'm scrolling background what makes you feel that player is moving (player's X remains same). So... he told me something about matrix view. I should create all walls and platforms static and scroll only the camera and move player's rectangle. I did a little research in Google, but nothing found. Can you tell me anything about it? How to start? Maybe links, books and resources? My programming language is Java (2d). Thank you!

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• Money investments for software developers [closed]

  - by user91590

  Let's say you (or your company) have an amount of money that you would like to invest in improving your career, and probably make more money in the long run by landing a better job or raising your productivity. There are some classical investments that anyone would suggest: spend on programming books, since they pay for themselves very quickly; buy a better chair, since you will stay on that all day; attend conferences to improve your network of contacts. I'm looking for more examples to weigh my options in the quest for improvement. Google does not help as it only shows job ads for programmers in the financial sector.

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• Vista Home Premium won't connect to network.

  - by Ice

  I deinstalled some software (e.g. some Toolbars for IE and Norton security suite, because the free trial period of 60 days is run out and so i want to switch to microsofts free security essentials). But now i cannot connect to the network again: Neither over LAN nor over WiFi. Neither with standard DHCP ON (sets a 169.254.x.y address) nor with fixed IP-Address. No error during changing the settings. Ping to the Gateway e.g. doesn't work and gives "generall failure". The DHCP-Client sets no IP-Address. There is allways only 'local access' on every network-connection. i ran out of ideas, please help. UPDATE per 2011-03-11: I followed each and every hint but nothing changed. I did a research on microsofts homepage through all the sites belonging to network but nothing helped. What can i do next?

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• Java on 256MB system?

  - by Mike S.

  For a school project, I've registered a free VPS on a hosting provider (pipni.cz). It has 256MB RAM: Mem: 262144k total, 148104k used, 114040k free, 0k buffers It's running on Debian Squeeze. I always get this error when I run a Java program: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. I tried to use Xms, Xmx, Xss with low values and still same result. ulimit -v gives me "unlimited". My application will be pretty simple and I need to use rmiregistry also. Can somebody help?

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• SunSolaris 5.10 + jdk 1.6 howto install on clean machine.

  - by user51176

  Can anyone please tell me step by step for downloading sun solaris (assuming I have a free account) and then installing jdk1.6 on it that should work? like: Download SunSolaris iso from http://.... Download patches? (for free account?) what should I do... if needed at all. Download jdk package 1.6 for sun solaris from http://... Install the jdk using... Now java and javac will work with jdk 1.6 Thanks, I tried a couple of things nothing really worked... thanks

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