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• Manually updating FF Add-ons

  - by cpp_fanatic

  My application installs my Firefox add-on (by copying an my.xpi to [FF_inst_dir]\extensions). This application interact with my FF add-on. This application periodically has updates (.xpi with new version). When my application is updating it does next: Remove folder and content [FF_inst_dir]\extensions\MyExtension Copy new my.xpi to [FF_inst_dir]\extensions However, when I restart FF I see: FF ask me about install add-on. I agree. FF remove my.xpi (it's ok) FF remove folder and content [FF_inst_dir]\extensions\MyExtension I think that FF try to remove old plugin. Thus, I havn't installed plugin. How it can be installed correct?

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• How to hide (in Thunar and Nautilus) a directory without putting a dot in its name?

  - by Ivan

  Usually Linux programs store user's settings in ~/.* directories. But unfortunately some developers (of some applications I need) do not follow this rule and don't start their settings storage folders names with a dot. This results in never-user-used folders cluttering (not the right word perhaps, as there are not many, but they annoy anyway) a home directory. Renaming them is not an option, as the applications won't find them in this case (and will create them again). Is there a way to hide a folder having no dot starting its name from being displayed in common file system browsers (I actually use Thunar of XFCE, alongside with Midnight Commander and Krusader, but wouldn't mind to know about Nautilus too).

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• Mirroring Ubuntu on several systems in a computer lab

  - by Harvey Steck

  I am working in a new refugee school where the only Internet service available is a slow satellite connection. We are about to set up a computer lab (already have desktop systems and am about to install Ubuntu on them). I'm a newbie when it comes to Linux, but it seems a better alternative than pirated copies of Windows. I'd like to set up one Ubuntu system, and then mirror that system on perhaps ten to twenty other systems (all of which would be on an ethernet network). I expect to have an internet connection on the one system that I set up, but then it may be difficult to have enough bandwidth to go through all the same steps on the other ten systems. Can I set up the other ten or twenty computers to get all of their updates/upgrades/configuration from one master system? Can I also set things up so that students cannot change the configuration, install new programs, etc.? Appreciate any help you can give. -- Harvey

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• Best exception handling practices or recommendations?

  - by user828584

  I think the two main problems with my programs are my code structure/organization and my error handling. I'm reading Code Complete 2, but I need something to read for working with potential problems. For example, on a website, if something can only happen if the user tampers with data via javascript, do you write for that? Also, when do you not catch errors? When you write a class that expects a string and an int as input, and they aren't a string and int, do you check for that, or do you let it bubble up to the calling method that passed incorrect parameters? I know this is a broad topic that can't be answered in a single answer here, so what I'm looking for is a book or resource that's commonly accepted as teaching proper exception handling practice.

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• Ubuntu 11.10 doesn't detect Intel integrated graphics (i7-2670QM CPU)

  - by Telmo Marques

  The laptop I'm using is an MSI GT683DX-847PT that comes with an NVIDIA GeForce GTX570M discrete GPU, and an Intel Core i7-2670QM CPU. According to Intel's description of the Core i7-2670QM CPU, it has an HD Graphics 3000 integrated GPU. The problem is that the Intel integrated graphics GPU doesn't come up in lspci nor in lshw, only the NVIDIA GPU shows up. Here is the output of both commands: sudo lspci: http://pastebin.com/raw.php?i=9AZg8bJy sudo lshw: http://pastebin.com/raw.php?i=6cAMFQsY I was counting on having two GPU's to run CUDA programs on the discrete NVIDIA GPU, while X was handled by the integrated Intel GPU, to prevent kernel execution timeout. Why doesn't the Intel HD Graphics 3000 GPU show up? Any tests I could make to verify the presence of an integrated GPU?

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• ImagickDraw::setFont has no effect on my system; suggestions?

  - by Dejay Clayton

  Running on Ubuntu LTS 8.04, PHP 5.2.8, ImageMagick 6.6.1-5 installed from source, and Imagick 2.3.0 installed from pecl. ImageMagick's 'convert' command sets fonts properly, and ImagickDraw::setFont properly complains if an invalid path to a font has been specified. However, specifying a valid font has no effect in changing the appearance of the drawn font whatsoever. Also, specifying a valid filename that contains invalid font data fails to trigger an error. It's almost as if Imagick isn't doing anything other than verifying that the specified file exists. Any suggestions?

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• Java: "Could not find the main class. Program will exit"

  - by AJ

  I'm trying to run SQuirreL SQL. I've downloaded it and installed it, but when I try to run it I get this error message: Java Virtual Machine Launcher. Could not find the main class. Program will exit. I get the gist of this, but I have not idea how to fix it. Any help? more info: I'm on Windows XP pro. I have java 1.6 installed, and other apps are running OK. The install ran OK. I believe I've followed the installation instructions correctly. To run it, I'm invoking the squirrel-sql.bat file. Update This question: http://stackoverflow.com/questions/1417328/could-not-find-the-main-class gives some background on this error from the point of view of a java developer.

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• What should developers know about Windows executable binary file compression?

  - by Peter Turner

  I'd never heard of this before, so shame on me, but programs like UPX can compress my files by 80% which is totally sweet, but I have no idea what the the disadvantages are in doing this. Or even what the compressor does. Website linked above doesn't say anything about dynamically linking DLLs but it mentions about compressing DESCENT 2 and about compressing Netscape 4.06. Also, it doesn't say what the tradeoffs are, only the benefits. If there weren't tradeoffs why wouldn't my linker compress the file? If I have an environment where I have one executable and 20-30 DLL's, some of which are dynamically loaded an unloaded fairly arbitrarily, but not in loops (hopefully), do I take a big hit in processing time decompressing these DLL's when they're used?

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• Wine installation on 12.04 LTS

  - by Dale

  Installed wine from the Software Center and kept getting errors when trying to load windows programs. Uninstalled and did the apt-get installation of the latest version (1.5.7) Ran Wine configuration and get a "Failed to connect to the mount manager, the drive configuration cannot be edited" If i try to install a program it immediately goes to "Internal error" Any Ideas or possible solutions would be appreciated. Thanks Dale Ran winecfg and got the following: getting server_pid from lock 2457 wine: cannot get pid from lock (lock isn't locked) err:process:start_wineboot failed to start wineboot, err 1359 p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: /usr/lib/i386-linux-gnu/pkcs11/gnome-keyring-pkcs11.so: cannot open shared object file: No such file or directory getting server_pid from lock 2457 wine: cannot get pid from lock (lock isn't locked) err:winecfg:WinMain failed to restart 64-bit L"C:\windows\system32\winecfg.exe", err 1359 getting server_pid from lock 2457 wine: cannot get pid from lock (lock isn't locked)

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• Minix3 on Vmware

  - by mohit

  Hi, I install minix3 on vmware using installation CD i make using .iso image which is available @minix3 I make 2GB Harddisk, 512MB RAM on VMware, and installed step-by-step. It got installed and working fine. But i wana install 'packman' which is X window system. I'm not able to install it. It asks for installation CD, its still there and its detected also, but i couldn't proceed. Have any1 tried installing 'packman' i.e X window system on minix3. Please guide me. :)

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• .apk signing fails even with Sun JDK (java.lang.NoClassDefFoundError: com.android.jarutils.DebugKeyP

  - by ianweller

  I'm having an interesting problem signing my Android application, whether or not I'm using a debug key. Regardless of the JDK I have installed to /usr/bin/{java,keytool,jarsigner} (OpenJDK or Sun's JDK) it will always give the following output after compiling successfully: -package-debug-sign: [apkbuilder] Creating RemoteNotify-debug-unaligned.apk and signing it with a debug key... BUILD FAILED /home/ianweller/AndroidSDK/platforms/android-7/templates/android_rules.xml:281: The following error occurred while executing this line: /home/ianweller/AndroidSDK/platforms/android-7/templates/android_rules.xml:152: java.lang.NoClassDefFoundError: com.android.jarutils.DebugKeyProvider The application was built and signed just fine by Eclipse with the ADT plugin (even without Sun's JDK installed). I'm on Fedora 12. I'm wanting to get my code out of Eclipse and move it into a git repository, but being unable to build it from ant will not allow this to happen.

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• Synaptic returns error

  - by donvoldy666

  I get the following error message when I run synaptic and I can't install any programs SystemError: W:Ignoring file 'getdeb.list.bck' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension, W:Duplicate sources.list entry 'http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry 'http://extras.ubuntu.com/ubuntu/ ' precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry 'http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry ' 'http://extras.ubuntu.com/ubuntu'/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry' 'http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry 'http://extras.ubuntu.com/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages), W:Duplicate sources.list entry 'http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu/ precise/main i386 Packages (/var/lib/apt/lists/ppa.launchpad.net_ubuntu-mozilla-security_ppa_ubuntu_dists_precise_main_binary-i386_Packages), E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/packages.rssowl.org_ubuntu_dists_precise_main_i18n_Translation-en, E:The package lists or status file could not be parsed or opened. I'm new to Linux so please help me out .

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• Firefox Nighty 19.0a1 doesn't integrate with the taskbar (12.04)

  - by JamesTheAwesomeDude

  Okay, we all know how the "Normal" Firefox has the Menu Bar (File, Edit, View, etc.,) integrated with the taskbar at the top of the screen, just like every other program in Ubuntu (with the exception of programs run with gksu.) Now, I downloaded and installed the Nightly build of Firefox, and have been using it via the launcher (I finally figured all that out!) but whenever I run the Nightly build, the menu bar is separate, like so: http://i.imgur.com/Xogbs.png How do I fix this? I remember there being some sort of extension that did that, but I can't find it anymore.

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• What is the best free program to burn DVD movies from DVD movie files that are present on the hard drive the way ImgBurn does it in Windows?

  - by cipricus

  Evaluating burning programs is difficult: it takes more time, while errors are very unpleasant. I have looked at AcetoneISO, Brasero, and K3B (which many recommend) but they seem more limited than Nero, CDBurnXP and especially ImgBurn from Windows. They all seem to work (did not tested them fully myself) but at a more basic level (create ISO, burn them, etc.). When it comes to something like creating a DVD movie disk from DVD movie files present on the hard drive, it seems to me that I would have to create the ISO first and then burn it, which involves using more hard drive space and more time. Looking in the Windows direction, there is a Nero for Linux. It costs money. ImgBurn is said to work well in Wine, but as yet I have not tested it enough. What other options are there?

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• LibreOffice Writer Error due to a lock file

  - by Brad

  Every time I try to open a word document I get this error. LibreOffice 3.5 Either another instance of LibreOffice is accessing your personal settings or your personal settings are locked. Simultaneous access can lead to inconsistencies in your personal settings. Before continuing, you should make sure user "closes LibreOffice on host". Do you want to continue? I've been onto different forums to find out a remedy but nothing yet. I've recently done a fresh install of 12.04 (64bit) and have been having some issues with different programs and have been able to work through most of them but this one, I'm lost.

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• Good university for computer science with plans for game development

  - by DukeYore

  I am starting my computer science degree at a local community college in programming using C++. However, I will be transferring to a 4-year university. Does anyone have any insight on university programs? I know Cal State Fullerton has a degree with a minor in Game Development. however, is that as important as getting a degree from a really great school? If I could shoot for something like Cal Poly would that be better? Or even Stanford or SF State being so close to so many gaming companies up there in the Bay area? Thank you in advance for any guidance.

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• Install a file which should be removed only on real uninstall and never overwritten

  - by Viv Coco

  When I install my application, along with the binaries, a conf file is installed that the user can change as he needs (it's actually the user data file). I would like this file to not be overwritten or deleted when a repair, upgrade, modify happens and it should be deleted only when a real uninstall happens. In other words: this conf file is installed along with the binaries and should never be touched again (overwritten/deleted) until a real uninstall happens (not repairs, modifies, upgrades) in which case it should be deleted. So I was thinking of doing: <Component Id="aaa.cfg" Guid="GUID"> <File Id="aaa.cfg" Source="aaa.cfg" KeyPath="yes" /> </Component> But I don't know how could I condition the component so that: 1) the component to be removed only on a real uninstall - not upgrades, repairs, modifies? 2) the file should in no case be overwritten if already exists. Thx, Viv

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• Compiling zip component for PHP 5.2.11 in MAMP PRO

  - by Zlatoroh

  Helo I installed MAMP PRO on my Macbook Pro (10.6) some time ago. Now I would like to use zip functions in php. I found that I must add zip.so to my extension folder and edited php.ini. On my computer I have two different versions of PHP one in MAMP folder and other in user/lib which was pre-installed on my system. Now I wish to compile my zip library for MAMP version. I got zip sources for my version of PHP then in terminal called function /Applications/MAMP/bin/php5/bin/phpize so it uses mamp php version ./configure make then I moved compile zip.so to extensions/no-debug-non-zts-20060613. When MAMP is launched it returns this error: [11-Apr-2010 16:33:27] PHP Warning: PHP Startup: zip: Unable to initialize module Module compiled with module API=20090626, debug=0, thread-safety=0 PHP compiled with module API=20060613, debug=0, thread-safety=0 These options need to match in Unknown on line 0 Can some body explain to me how to do this the right way.

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• Generating a reasonable ctags database for Boost

  - by Robert S. Barnes

  I'm running Ubuntu 8.04 and I ran the command: $ ctags -R --c++-kinds=+p --fields=+iaS --extra=+q -f ~/.vim/tags/stdlibcpp /usr/include/c++/4.2.4/ to generate a ctags database for the standard C++ library and STL ( libstdc++ ) on my system for use with the OmniCppComplete vim script. This gave me a very reasonable 4MB tags file which seems to work fairly well. However, when I ran the same command against the installed Boost headers: $ ctags -R --c++-kinds=+p --fields=+iaS --extra=+q -f ~/.vim/tags/boost /usr/include/boost/ I ended up with a 1.4 GB tags file! I haven't tried it yet, but that seems likes it's going to be too large to be useful. Is there a way to get a slimmer, more usable tags file for my installed Boost headers? Edit Just as a note, libstdc++ includes TR1, which has allot of Boost libs in it. So there must be something weird going on for libstdc++ to come out with a 4 MB tags file and Boost to end up with a 1.4 GB tags file.

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• The method split(String) is undefined for the type String

  - by pi

  I am using Pulse - the Plugin Manager for Eclipse and installed. I have the Eclipse 3.5 for mobile development(Pulsar) profile with a couple other profiles. I realized that the split() method called on a string from code such as below: String data = "one, two, three, four"; data.split(","); generates the error: "The method split(String) is undefined for the type String". I am aware that the split() method did not exist before Java's JRE 1.4 and perhaps could be the cause of the problem. The problem is I don't think I have jre/sdk versions installed. Perhaps there's one in-built with the Pulsar profile and needs editing - but I couldn't tell what settings (and where) needs tweaking. I have checked WindowsPreferencesJavaInstalled JREs and it's set to = jre1.4. Please help thanks.

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• an HTML file is NOT an Excel file, right?

  - by longneck

  we use an application that has an "export to excel" feature that doesn't work on PC's that done have outlook express installed. i know, you're thinking "WTF does outlook express have to do with excel files?" i asked the same thing, and here's what i found: the file being generated is actually one of those Microsoft Single File Web Pages (.mht) and NOT an excel file you need to have outlook express installed to actually view a .mht file. i've explained to their support people that just because you can slap a .xls on a file and excel will open it does not mean its an excel file, and does not mean that this is the right way to do it. how would you explain that this is not proper?

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• enable javascript support for eclipse

  - by user295189

  how do I enable javascript support in eclipse pdt. I have aptana installed. thx

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• How to refactor an OO program into a functional one?

  - by Asik

  I'm having difficulty finding resources on how to write programs in a functional style. The most advanced topic I could find discussed online was using structural typing to cut down on class hierarchies; most just deal with how to use map/fold/reduce/etc to replace imperative loops. What I would really like to find is an in-depth discussion of an OOP implementation of a non-trivial program, its limitations, and how to refactor it in a functional style. Not just an algorithm or a data structure, but something with several different roles and aspects - a video game perhaps. By the way I did read Real-World Functional Programming by Tomas Petricek, but I'm left wanting more.

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• Setting the Hostname in IIS Bindings Breaks Website

  - by Josh

  I just got a Windows Server 2008 VPS and I'm having trouble getting IIS7 setup. I created a new website in IIS with the path, ip address, and hostname (like 'www.nameofsite.com') and click OK. When I browse to the site it pulls up "http://www.nameofsite.com" in the browser and... nothing... IE cannot display this webpage. If I blank out the hostname in the bindings and click [Browse] it works fine (it takes me to http://10.10.2.92 - the computer's ip). So entering the hostname breaks the website. Any ideas on what I'm missing? Services I might not have running or roles I'm missing? No server roles were initially installed on the VPS so I installed IIS, DHCP, DNS, and Application Server... overkill, but I wasn't sure what to install.

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• WiX ServiceDependency for dynamically named services

  - by glenneroo

  The target system will have a set of dynamically-named CORBA services installed that my own service is dependent on e.g. IT iona_services.config_rep.VirtualXP-37192 cfr-DOMAIN IT iona_services.event.VirtualXP-37192 DOMAIN IT iona_services.ifr.VirtualXP-37192 DOMAIN IT iona_services.locator.VirtualXP-37192 DOMAIN IT iona_services.naming.VirtualXP-37192 DOMAIN IT iona_services.node_daemon.VirtualXP-37192 DOMAIN where "VirtualXP-37192" is the name of the PC. Any ideas what i have to put into this line: <ServiceDependency Id="IT iona_services.*" Group="yes" /> Will i need a custom action thingy to retrieve a list of installed services and search through those? Or is there a way in WiX to retrieve a list of services?

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