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  • I still can't figure out how to program!

    - by Mark K.
    Please help! I've read lots of programming books for various languages, Java, Python, C, etc. I understand and know all of the basics of the languages and I understand algorithms and data structures. (Equivilant of say 2 years of CompSci classes) BUT, I still can't figure how to write a program that does anything useful. All of the programming books show you how to write the language, but NOT how to use it! The programming examples are all very basic like build a card catalog for a library or a simple game or use algorithms etc... They dont't show you how to develop complex programs that actually do anything useful! I've looked a open-source programs on sourceforge, but they don't make much sense to me. There are hundreds of files in each program & thousands of lines of code. But how do I learn how to do this? There's nothing in any book I can buy on Amazon that will give me the tools to write any of these programs. How do you go from reading Intro to Java or Programming Python, or C Programming Language, etc.. to actually being able to say, I have an idea for X Program.. this is how I go about developing it? It seems like there is so much more involved in writing a program than you can learn in a book or from a class. I feel like there is someth Can anyone put me on the right track?

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  • I/O redirection using cygwin and mingw

    - by KLee1
    I have written a program in C and have compiled it using MinGW. When I try to run that program in Cygwin, it seems to behave normally (i.e. prints correct output etc.) However, I'm trying to pipe output to a program so that I can parse information from the program's output. However, the piping does not seem to be working in that I am not getting any input into the second program. I have confirmed this by using the following commands: This command seems to work fine: ./prog Performing this command returns nothing: ./prog | cat This command verifies the first: ./prog | wc Which returns: 0 0 0 I know that the script (including the piping from the program) works perfectly fine in an all Linux environment. Does anyone have any idea for why the piping isn't working in Cygwin? Thanks!

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  • On installing nvidia drivers on 12.10 I get "Bad return status for module build on kernel: 3.5.0-19-generic (x86_64)"

    - by james
    New Ubuntu user - just recently made the mistake of trying a different nvidia driver. I'd managed to get the last (nvidia-current) one working through software sources a few weeks ago. The other day I tried to cross over to nvidia-experimental-310 and this produced a system error. Swapping back and forth between proprietary drivers now always causes an error and I can't get any of them to work. Installing through the terminal I get this error message every time: Building initial module for 3.5.0-19-generic Error! Bad return status for module build on kernel: 3.5.0-19-generic (x86_64) Consult /var/lib/dkms/nvidia-experimental-310/310.14/build/make.log for more information On rebooting, I end up with the crappy screen resolution and the thick black border around the screen. I use gksudo software-properties-gtk to bring up sources, where I can change back to the nouveau driver, which restores my screen. After that I can't find /var/lib/dkms/nvidia-experimental-310/310.14/build/make.log so I can't tell you what's inside. Any ideas what might be preventing the nvidia driver from installing? SOLUTION FOUND Okay - so I have a workaround. This is what has worked: Upgrade to kernel 3.7.0 as detailed here upgrade to latest version of the nvidia drivers as detailed here No idea what was happening with kernel 3.5.0-19, but this seems to be better. A little slower maybe on boot, but after days of messing around it's nice to have something that works.

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  • Kubuntu 11.10 Lot of Networking problems

    - by Cobraone
    Since I upgrade to 11.10 I have a lot of problems with KDE. First of all there are problems in configuring a static IP address. Just to explain @home I have a normal fiber ADSL and I use a DHCP. When I go to a customer I must insert a static IP address. With ifconfig everything seems ok but there is something wrong in searching DNS names. (I have installed Ubuntu and was going ok again). Now I Have reinstalled again Kubuntu 11.10 and I have the same problem in addition today I have discovered that if I connect to a network in another customer office the desktop freezes and I could only switch between windows with alt+tab. No FN key or right click to open run command works. So i unplugged network (configuration is just DHCP here) and tried on another position in office. It was the same. My Laptop freezes when connected, a fedora 14 of a friend works. So I decided to connect my Galaxy S II as USB network device. Everything is ok for like 3 minutes. When I noticed a little loss of signal again the desktop freezes and i must work (like now) just switching between windows with alt+tab). Additional information: Unplugging network or restarting it via Konsole does not not solve the freezing problem. Every time I must open a console and reboot. Any idea of what tests to do ? Just a recommendation: If I must post here logs or something else please guide me. I use Linux since Ubuntu 9 but I am not an "expert".

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  • Enlarge partition on SD card

    - by chenwj
    I have followed Cloning an SD card onto a larger SD card to clone a 2G SD card to a 32G SD card, and the file system is ext4. However, on the 32G SD card I only can see 2G space available. Is there a way to maximize it out? Here is the output of fdisk: Command (m for help): p Disk /dev/sdb: 32.0 GB, 32026656768 bytes 64 heads, 32 sectors/track, 30543 cylinders, total 62552064 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: 0x000e015a Device Boot Start End Blocks Id System /dev/sdb1 * 32 147455 73712 c W95 FAT32 (LBA) /dev/sdb2 147456 3994623 1923584 83 Linux I want to make /dev/sdb2 use up the remaining space. I try resize2fs /dev/sdb after dd, but get message below: $ sudo resize2fs /dev/sdb resize2fs 1.42 (29-Nov-2011) resize2fs: Bad magic number in super-block while trying to open /dev/sdb Couldn't find valid filesystem superblock. Any idea on what I am doing wrong? Thanks.

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  • Is allowing remote Sql Server Management Studio safe?

    - by dave thieben
    I administer a website that runs on IIS on one box, and SQL Server 2008 Workgroup on another box. typically I remote into the DB box and run SSMS to work on the db, but I would like to be able to access the db directly with SSMS on my local box. I've seen the other questions about allowing remote access to the database, but my question is, is this safe? I'm concerned that I'm opening a hole in the firewall and potential for hack attempts. Is this just a bad idea in general?

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  • How to access Ubuntu Server from local PC?

    - by Roland
    Today I installed my first web server, which is Ubuntu 12.04 LTS. I got Apache, PHP and MySql working, there is even MyPHPAdmin! Everything is working fine on that PC, but the problem is that I have no idea how to connect to this server from my PC. Just to clarify- I got one PC that I work on and got another one, which has Ubuntu Server running. I even managed to connect them through the router, which I made to work as a switch. I can see the Ubuntu Server on my Windows PC in "Network", but it's empty, I can't see any files. I tried to share a folder etc/www on Server, but it shows an error saying something about right, that I'm not this folder's owner. I guess I'm not doing the right thing at all, am I? Even if I could see shared folder on my Windows PC- I would still be not able to type "somedomain.com" on Windows PC and access for example index.php or MySql database. So, the question is- how do I configure Ubuntu Server to be accessible from Windows PC?

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  • how to fix An error occurred during the processing of a configuration file required to service this request

    - by Alex
    Just created branda new MVC 4 project and instead of expected "hello world" got following error: ==================================================== Server Error in '/' Application. Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: Default Role Provider could not be found. Source Error: Line 244: Line 245: Line 246: Line 247: Line 248: Source File: c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Config\machine.config Line: 246 Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272 =============================================================== Any idea how to fix this? Thanks

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  • mysql does not start properly

    - by Erik Svenson
    Hi I am using XAMPP on Windows XP. Since I changed the version from 1.73 to 1.77 MySQL does not start properly. That means that the status says, it is started, but the safety check says it is not . Because of that I cannot set any password, which is unacceptable. Any idea? That's mysql_error.log: 111007 9:42:56 [Note] Plugin 'FEDERATED' is disabled. 111007 9:42:56 InnoDB: The InnoDB memory heap is disabled 111007 9:42:56 InnoDB: Mutexes and rw_locks use Windows interlocked functions 111007 9:42:56 InnoDB: Compressed tables use zlib 1.2.3 111007 9:42:56 InnoDB: Initializing buffer pool, size = 16.0M 111007 9:42:56 InnoDB: Completed initialization of buffer pool 111007 9:42:57 InnoDB: highest supported file format is Barracuda. 111007 9:42:57 InnoDB: Waiting for the background threads to start 111007 9:42:58 InnoDB: 1.1.8 started; log sequence number 1595675 111007 9:42:58 [Note] Event Scheduler: Loaded 0 events 111007 9:42:58 [Note] mysql\bin\mysqld.exe: ready for connections. Version: '5.5.16' socket: '' port: 3306 MySQL Community Server (GPL)

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  • Why does everybody have the same MAC address as me?

    - by iblue
    I just bought some consumer-grade McCheap PCI-E NICs (and this was a bad idea). They both have the same MAC address. When I google it, it seems like every card of that company has the same address: 00:50:43:00:45:3e. Shouldn't they be unique? According to lspci it's a Marvell Technology Group Ltd. 88E8053 PCI-E Gigabit Ethernet Controller (rev 20). Is there a way to permanently flash a new address?

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  • how do I determine how much VRAM is in the system?

    - by Cocoa Dev
    I just bought a Samsung Series 7 laptop but I have no idea how much VRAM the graphics card has. This is an NVIDIA OPTIMUS card. I am using Windows 7 and will upgrade to 8 within the hour. I switched from Mac to PC. So its not familiar to me. I am sorry that you guys know where to look and think this question is very trivial. Someone is selling me his laptop and claims it has 1GB VRAM. The stock # says it should have 512MB and I wanted to verify these details.

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  • Postfix not receiving non-local mail

    - by Davis Sorenson
    I set up a server with Postfix/Dovecot on Linode/Ubuntu 10.04 according to this guide, admittedly I've never done this before. Local mail works just fine, but trying to send email to it from external addresses results in errors like this: Delivery to the following recipient failed permanently: <address>@ni-mate.com Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 553 553 Unknown recipient. (state 13). I honestly have no idea what to do or which configuration files/logs anyone needs to see.

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  • nginx not returning 304 on cached content

    - by Don H
    I'm using nginx as a reverse proxy with an Apache back-end handling some PHP files. The files return the right expiry headers and proxy_cache does a good job of caching them, but I've noticed that the cached content returns a 200 on every refresh, when it might be more efficient to return a 304 on the cached files. The files in question are generated by PHP. The urls do not have .php in them as they've been prettified. Any idea why nginx might not be returning 304 on repeated visits to a cached PHP output? To clarify: It's using proxy_cache for caching dynamic PHP pages (not static html pages generated by PHP). I'm setting expires headers in the PHP file of time + 24 hours. With that in mind, I was hoping nginx would be able to then return 304s on its cached versions during that 24 hour window.

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  • Problem installing a w2k DC on Hyper-V?

    - by Tony
    Hi, We have a cluster with four node windows 2008 r2 and hyper-v installed. We would like to install 2 VM with role domain controller w2k (the domain is different from the domain of the hyper-v cluster). Do you know if there are any restriction on doing it? Some collegues say that we risk data corruption if we do live migrations. Others speak about the fact that Microsoft don't support w2k any more. And others have doubts because the global catalog server installed on these DC could have loss of performance. Any idea? Thanks Tony

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  • Laser range finder, what language to use? Beginner advice

    - by DrOnline
    I hope this is the right place. I am a programming beginner, and I want to make a laser range finder, and I need advice about how to proceed etc. In a few weeks I will get a lot of dirt cheap 3-5V lasers and some cheap usb webcams. I will point the laser and webcam in parallel, and somehow use trigonometry and programming to determined distance. I have seen online that others made done it this way, I have purposefully not looked at the details too much because I want to develop it on my own, and learn, but I know the general outline. I have a general idea of how to proceed. The program loads in a picture from the webcam, and I dunno how images work really, but I imagine there is a format that is basically an array of RGB values.. is this right? I will load in the red values, and find the most red one. I know the height difference between the laser and the cam. I know the center dot in the image, I know the redmost dot. I'm sure there's some way to figure out some range there. TO THE POINT: 1) Is my reasoning sound thus far, especially in terms of image analysis? I don't need complete solutions, just general points 2) What I need to figure out, is what platform to use. I have an arduino... apparently, I've read it's too weak to process images. Read that online. I know some C I know some Python I have Matlab. Which is the best option? I do not need high sampling rates, I have not decided on whether it should be automated or whether I should make a GUI with a button to press for samples. I will keep it simple and expand I think. I also do not need it to be super accurate, I'm just having fun here. Advice!

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  • Is it possible to change the postfix message-id?

    - by Marcus
    Is it possible to change the message-id in postfix? If I send Mails over an Java-Application I get the following message-id: message-id=<143303043.111334605578921.JavaMail.applicationanme@hostname> So I want that the message-id looks like this: message-id=<[email protected]> What I can understand, if I send mails with the Linux program mail it works: message-id=<[email protected]> I have already set my hostname in the postfix-conf, but when I send a mail with the java-application it doen't work. We use a relay host to send email and any messages which are sent without @domain.tld in the mail-id will detected as a spam mail. Do you have any idea how I can fix this?

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  • How to work as a team of two

    - by Ezi
    I work in a team of 2 developers, my partner is the founder of the company, in the beginning he did everything on his own. He hired me about 3 years ago to help him get things done quicker and satisfy our customer needs. Often I get small project to do all by my own, as long as it works great (and it usually does...) he doesn't care much on what I did or how I did it. But if the customer calls him up asking why something doesn't work as expected and I'm not around to forward the call to me, he could get very angry on why he doesn't have an idea on how that program works. I don't keep anything as a secret, if he asks me on something how I did it I'm happy to explain as long as he's willing to listen (which isn't long), but I don't know why I need to say it in first place, in developing software everything is written down clearly. Most of the time I work on projects he wrote and I don't need to ask him anything (it happens maybe once a month that I ask him how something works, just because I don't have the time to look it up). I've read a lot on that great site about small teams that usually means 7-12 people. I couldn't find how 2 people work as a team; we don't have project managers, reviewers or testers. I feel that the fact he don't have time to review the code on his own is not my problem, so the question here is am I doing something rung? I need to walk over to him and give him a lecture on what I did even he doesn't ask me?

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  • Exchange server listening on port 25 but clients dont recieve emails

    - by Josh R
    My exchange server is listening on port 25, that is I can telnet into it and send an email but Outlook 2010/2007, OWA, and ActiveSync are not pulling down emails. Outlook 2010 specifically says Connected To Exchange Server and Updating Inbox but it never updates the inbox. Also, OWA shows some of the newer mail messages, but when I double click on one to open it up in OWA, it times out. Any idea what could be causing this? Also Exchange Transport and Information Store are started. Thanks!

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  • Is Ruby on Rails supposed to have a steep learning curve or is it just me?

    - by Anita
    I'm a self-taught programmer. I've been learning RoR since October with varying intensity (sometimes all day, sometimes nothing for several weeks). Before that I knew only Java, but knew it pretty well. I've heard so much hype about RoR and how it's supposed to make you happy, productive, etc. So far it's only made me frustrated. I learned it out of the Agile book, and I suspect part of the difficulty might have to do with my not knowing JavaScript and CSS, and having only a shaky grasp of databases and HTML. But apparently it took me much longer to complete the project in the Agile book than other people, and I still don't remember much of it. There are some things about Rails that I just can't seem to get, e.g. when to use symbols and when NOT to, or how dynamic methods are called. Recently I was given a small Rails assignment where I'm asked to make a small change to the interface. It's taken me around 25 hours and although I've made some progress in understanding the code, I still have no idea how to proceed. I can't even ask Stack Overflow because there is so much code I'll have to provide to give context. So my question is in the title: is RoR supposed to take a long time to learn or am I just slow? Can it be that I've been learning from the wrong book? My learning style is such that I either understand nothing or understand everything, if that makes sense. Thanks!

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  • Cannot usermod -L in LightDM scripts

    - by user95723
    I'm running Xubuntu 12.04 and use the LightDM. I want to restrict access to the machine as a kind of parental control. This is how it should work I hook in a script that executes just before the greeter comes up. Within that script some awk processing will read an entry in a config file and will trigger a usermod -L or usermod -U depending on whether the user is allowed to login. While user is logged, a cron job will count down the entry in the config and forces a xfce4-session-logout if time is up. A cron job running on a server will upload the "credits" on a daily base. How is this idea? That's theory, now for the problems It appears for some unknown reason, the usermod command is not executed, neither as part of a display-setup-script nor within the greeter-setup-script. I wrote a small sandbox script usermod -L johndoe 2error.txt touch /etc/blabla 2error.txt The script is executing, cause the blabla file is existing. That means that the script must have been executed with root privileges. error.txt is empty but the usermod command has just no effect. Is this a bug or a feature. What's wrong? Best regards and thank you Oli

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  • Java application not starting in Tomcat, Plesk 9 server

    - by netagence
    Hi I have a Plesk 9.3 CentOS 5 server on which I installed the addon to have Tomcat functions. One application I have uploaded appears in the Plesk Tomcat user panel but with a yellow exclamation mark and the error "Actual status of the application does not correspond to the status retrieved from the database". The app therefore does not run, while other uploaded test .war applications do. The server runs Tomcat tomcat5.5.23-0jpp.7.el5_2.1 which matches the requirements for the required app according the the company that made it. While searching for the solution I could find all 3 uploaded .war applications in /usr/share/tomcat5/psa-wars/domainhere.com/ but they do not seem uncompressed there even though 2 of them run fine. Not enough Tomcat / Java knowlede to go on... Any idea to help me here ? Best regards.

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  • Why S3 website redirect location is not followed by CloudFront?

    - by ychaze
    I have a website hosted on Amazon S3. It is the new version of an old website hosted on WordPress. I have set up some files with the metadata Website Redirect Locationto handle old location and redirect them to the new website pages. For example: I had http://www.mysite.com/solution that I want to redirect to http://mysite.s3-website-us-east-1.amazonaws.com/product.html So I created an empty file named solutioninside my bucket with the correct metadata: Website Redirect Location= /product.html The S3 redirect metadata is equivalent to a 301 Moved Permanentlythat is great for SEO. This works great when accessing the URL directly from S3 domain. I have also set up a CloudFront distribution based on the website bucket. And when I try to access through my distribution, the redirect does not work, ie: http://xxxx123.cloudfront.net/solution does not redirect but download the empty file instead. So my question is how to keep the redirection through the CloudFront distribution ? Or any idea on how to handle the redirection without deteriorate SEO ? Thanks

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  • Computer sometimes doesn't boot after power failure, what should I replace?

    - by user1416256
    I have a new computer that behaves strange after a power failure. When I switch off the computer it will not boot anymore. Completely unplugging the computer for about an hour cures the issue for the next boot. The internal leds are working I have no idea where to start looking. What, in your opinion could be the cause of this strange behaviour ? My best bet would be to replace the power supply Would that be a good place to start ?

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  • Is there a way to force Windows to recognize a network folder as a local drive, for the purposes of

    - by NoCatharsis
    I just started using the file search program Everything at work to search through documentation on our shared drives. This is after disappointments with Google Desktop and Windows Search. I love the speed of Everything, but I wish it were able to index other shared folders. My makeshift solution was to somehow force Windows to recognize the necessary shared folders as local drives, then add them to the index list. I have also considered using SyncToy, but this requires downloading all data to my drive, which could be terabytes of information - obviously not a good idea on a small company network. What would be the best solution here?

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  • Move a player to another team, with players stored in one arraylist and teams in another using java

    - by user1056758
    Basically I have a team class, which has an array list that store the players in. In the driver class theres an arraylist that stores the teams. Anyhow I've worked out how to add a player to a specific team and like wise remove a player from said team. Where I'm hitting problems is when I try to transfer one player to another. My understanding is to scan through the first team,and get the player. Then some how add this player to another, by scanning through the chosen team and add to it? I've tried this way but it seems to replace the original player with the new player in both teams. My other approach would be to somehow return the parameters of the player object, create another with the return parameters, remove the orignal then add the new instance in the other team? Really not quite generally how I can go about this, been trying all afternoon! If someone could offer me a general idea, then I can go off and apply the understanding to practice. Many thanks

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