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  • I'm a student learning C++ and I've recently found out about Ruby. Would learning (some of) Ruby help me with C++ or would it just confuse me?

    - by Von32
    Hi! As the title says, I'm a student that will be starting my second year of C++ very soon. I've discovered Ruby, however. While I've heard much buzz about the language before, I've disregarded it because I always thought it wasn't something that would be useful. However, I've found a number of FANTASTIC tutorials on ruby and am interested in learning it (probably because it seems so straightforward). Would playing around with ruby be a good or bad idea? I understand that there's not such thing as bad knowledge, but I'm afraid that Ruby will only confuse me when dealing with C++. How different from C++ is it? I've read it's based on C in some way, but my google-fu seems to be horrible today. How useful is Ruby in the real world? I'm not specifically asking about jobs- I'm more interested in what sort of applications may come from this language. Any specific examples worth looking at? Going back to Question two- I've read some posts on here that Ruby and C++ can hold hands once in a while. How flexible is this relationship? Is it rarely that this would work? Thank you Very much for your time! EDIT: This has to be the one community on the internet that doesn't suck. Why have I never posted before? You guys are awesome!

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  • I need some career guidance, please.

    - by user18956
    Hi, I have been a teacher of guitar and music theory for the last ten years or so, and I have decided to get out of it and pursue something involving computers, but I am very confused about it all. I have no training related to programming besides a knowledge of xhtml and css - which I realize are not even programming languages. My problem is that I know I want to do something with either making video games, computer/online applications, or some other programming job, but I haven't a clue how to begin. I picked up a book from the Head First series entitled, Head First Programming that uses Python to teach programming concepts, but after that, I don't really know what is a good direction for me in terms of balancing career satisfaction with job availability and acceptable pay. I am not looking for a huge salary, I just want to be able to survive doing something I love, and which challenges me. I don't know even a single person involved in a related field, so I am in need of guidance. The first thing I would like to know is whether pursuing a career as a programmer for video games is a realistic option. I love video games, and play them all the time, and I have always wanted to make them. If this is an option, what would be the recommended course of action? What is a good language or technology to get involved in for the job market now? I have read that PHP/MySQL is a good place to find a job for some. Can I find a job without school, or do I need to got o college? Also, will the Python I learn in this book translate into any other language I need to learn? If it is anything like music, then I am sure it will, but I don't know much about programming - yet. And last, yet perhaps most important, is thirty years old too old to take such a radical redirection in careers? Thank you for any help you can offer. I really need it.

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  • What characteristic of a software determines its operational scope?

    - by Dark Star1
    How can I classify whether a software is a medium with the ability to grow into an enterprise level software or whether it is already there? And how should I use the information to choose the appropriate language/tool to create the software? At first I was asking whether Java or PHP is the best tool to design enterprise level software, however I've suddenly realized that I am unable to put the software I'm tasked with redesigning into the proper scope so I'm lost. Edit: I guess I'm looking for tell tale signs in software that may tip the favour towards enterprise level type software in the sense of functional and operational characteristics; functional: what it does (multi-functional), Architectural characteristics such as highly modular. operational: multi-sourced and multi-homed, databases, e.t.c. To be honest the reason I ask is because I'm skeptical about the use of PhP to design a piece of employee and partial accounting software. I'm more tipping towards the use of JSP and an hmvc framework such as JSF, wickets, e.t.c. where as the other guy wants to go the PhP way although I'm not experienced with PhP, as far as I know it's not an OO oriented language hence my skepticsm towards it.

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  • Kubuntu 11.04 bad experience, Gimp crashes and other bugs

    - by giowck
    I installed Kubuntu 11.04 64bit today. First let me expose some issues, this is not a rant, just some observations on Kubuntu 11.04 :) Flash doesn't work. The package "flashplugin-installer" was installed by rekonq. But still no flash. Additional Drivers (jockey-kde) doesn't show up automatically after first login. I tried to delete a large file (19,2 GB), an error appeared: "Please empty the trash first, no more space available" or something like that, but you know what? My trash was empty! (Then I found in Dolphin the settings to increment the max size of the trash). Amarok has no play/pause/forward/back buttons, only after changing settings to show those buttons on the top bar. GTK applications like ubuntu software center, inkscape... are in english, but my default language is "german". Only gimp allows to install the "de" language pack. The numblock turns off after each restart. In the KDE Control Center, the "remember last state" of numblock is set. But this is not working. I had some crashes: Nepomuk, Policy-kit, plasma-workspace and gimp. But now to the important stuff. I really need Gimp to work. After starting it, I get a crash: giowck@giowck-desktop:~$ gimp (gimp:1899): GLib-WARNING **: /build/buildd/glib2.0-2.28.6/./glib/goption.c:2132: ignoring no-arg, optional-arg or filename flags (8) on option of type 0 Speicherzugriffsfehler (in English: "Memory error") What can I do to run Gimp? Thanks

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  • I'm a student learning C++ and I've recently found out about Ruby. Would learning (some of) Ruby help me with C++ or would it just confuse me?

    - by Von32
    As the title says, I'm a student that will be starting my second year of C++ very soon. I've discovered Ruby, however. While I've heard much buzz about the language before, I've disregarded it because I always thought it wasn't something that would be useful. However, I've found a number of FANTASTIC tutorials on ruby and am interested in learning it (probably because it seems so straightforward). Would playing around with ruby be a good or bad idea? I understand that there's not such thing as bad knowledge, but I'm afraid that Ruby will only confuse me when dealing with C++. How different from C++ is it? I've read it's based on C in some way. I've read some posts on here that Ruby and C++ can hold hands once in a while. How flexible is this relationship? Is it rarely that this would work? How useful is Ruby in the real world? I'm not specifically asking about jobs- I'm more interested in what sort of applications may come from this language. Any specific examples worth looking at?

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  • PHP: A config file in .ini or .php format?

    - by Tim Visee
    I'm working on a huge CMS system, and I asked myself what configuration format I should use. There are two common formats for configuration files. The first one is an INI file, containg all the configuration properties. Then you can simply parse this INI file using build in PHP functions. A second option is to use a PHP file containing a regular PHP array with these configuration properties. Now, it's easier to edit an INI file, but a PHP file give's you more options, for example it allows you to add a function which retrieves one of the configuration options while reading the configuration file. Note: The PHP configuration file would only contain an array of configuration, no initialization functions or anything. (This is possible of course, but it's not implemented by default) Now, what is recommend for me to use as configuration file? What is the most common format for a configuration file? Should I go for simplicity with the INI files, or with a more dynamic one using PHP. One thing to note, this is not for personal usage. I'm planning to release the CMS system soon, and a lot of websites are scheduled already to change to my CMS system.

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  • Migrating BizTalk 2006 R2 to BizTalk 2010 XLANGs Issue

    - by SURESH GIRIRAJAN
    When we migrate some BizTalk apps from BizTalk 2006 R2 to BizTalk 2010, and we ran into issue when a .net component called inside the orchestration. In the .net component we are trying to retrieve some promoted property and we also checked in the BizTalk group hub to validate it was promoted, no issues there.  Only when we try to access the data into the .net component we had issue. We just moved all the assembly what we had in BizTalk 2006 R2 to BizTalk 2010, didn’t recompile anything in BizTalk 2010 environment. But looking further there is couple of new namespace added to the Microsoft.XLANGs… in BizTalk 2010 compared to BizTalk 2006 R2 caused the issue. So all we did to fix the issue is recompile the project in 2010 environment and it worked fine. So it looks like some backward compatibility issue.  public static void Load(XLANGMessage msg) {  try  {      // get the process id from context.       object ctxVal = msg.GetPropertyValue(typeof(ProcessID)); … } BizTalk 2010: Error Message in the event viewer:  The service instance will remain suspended until administratively resumed or terminated. If resumed the instance will continue from its last persisted state and may re-throw the same unexpected exception. InstanceId: 441d73d3-2e84-49d2-b6bd-7218065b5e1d Shape name: Bulk Load ShapeId: bb959e56-9221-48be-a80f-24051196617d Exception thrown from: segment 1, progress 65 Inner exception: A property cannot be associated with the type 'Tellago.Common.Schemas.ProcessId'.   Exception type: InvalidPropertyTypeException Source: Microsoft.XLANGs.Engine Target Site: Microsoft.XLANGs.RuntimeTypes.MessagePropertyDefinition _getMessagePropertyDefinition(System.Type) The following is a stack trace that identifies the location where the exception occured   at Microsoft.XLANGs.Core.XMessage._getMessagePropertyDefinition(Type propType) at Microsoft.XLANGs.Core.XMessage.GetContentProperty(Type propType) at Microsoft.XLANGs.Core.XMessage.GetPropertyValue(Type propType) at Microsoft.BizTalk.XLANGs.BTXEngine.BTXMessage.GetPropertyValue(Type propType) at Microsoft.XLANGs.Core.MessageWrapperForUserCode.GetPropertyValue(Type propType) at Tellago.Common.Components.Load(XLANGMessage msg) at Tellago.SuspensionProcess.segment1(StopConditions stopOn) at Microsoft.XLANGs.Core.SegmentScheduler.RunASegment(Segment s, StopConditions stopCond, Exception& exp)

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  • Alternatives for the Snippet Compiler

    - by Marko Apfel
    It seems that the Snippet Compiler is not maintained anymore. So I need an alternative – also for getting syntax highlighting for code in publications. Preferable with the possibility to conserve this highlighting by copying selections to clipboard. Snippet Compiler does not allows this for selections – only by exporting the whole file content to clipboard with HTML- or RTF-formatting (File > Export > HTML to clipboard respectively RTF to clipboard). Today I switched to LINQPad. This application offers constructing LINQ-statements as well as compiling arbitrary code snippets. But there are some other alternatives too: CS-Script - The C# Script Engine CS-Script is a CLR (Common Language Runtime) based scripting system which uses ECMA-compliant C# as a programming language. CS-Script currently targets Microsoft implementation of CLR (.NET 2.0/3.0/3.5. sharpsnippetcompiler C# Snippet Compiler is a tiny IDE to create, debug and run your C# programs CsharpRepl C# interactive shell that is part of Mono's C# compiler. An interactive shell is usually referred to as a read eval print loop or repl. The C# interactive shell is built on top of the Mono.CSharp library, a library that provides a C# compiler service that can be used to evaluate expressions and statements on the flight. What I miss is an alternative with syntax highlighting like in my Visual Studio: Instead of:

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  • How can a large, Fortran-based number crunching codebase be modernized?

    - by Dave Mateer
    A friend in academia asked me for advice (I'm a C# business application developer). He has a legacy codebase which he wrote in Fortran in the medical imaging field. It does a huge amount of number crunching using vectors. He uses a cluster (30ish cores) and has now gone towards a single workstation with 500ish GPUS in it. However where to go next with the codebase so: Other people can maintain it over next 10 year cycle Get faster at tweaking the software Can run on different infrastructures without recompiles After some research from me (this is a super interesting area) some options are: Use Python and CUDA from Nvidia Rewrite in a functional language. For example, F# or Haskell Go cloud based and use something like Hadoop and Java Learn C What has been your experience with this? What should my friend be looking at to modernize his codebase? UPDATE: Thanks @Mark and everyone who has answered. The reasons my friend is asking this question is that it's a perfect time in the projects lifecycle to do a review. Bringing research assistants up to speed in Fortran takes time (I like C#, and especially the tooling and can't imagine going back to older languages!!) I liked the suggestion of keeping the pure number crunching in Fortran, but wrapping it in something newer. Perhaps Python as that seems to be getting a stronghold in academia as a general-purpose programming language that is fairly easy to pick up. See Medical Imaging and a guy who has written a Fortran wrapper for CUDA, Can I legally publish my Fortran 90 wrappers to Nvidias' CUFFT library (from the CUDA SDK)?.

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  • Two new Visual WebGui released simultaneously

    - by Webgui
    Two new Visual WebGui versions were released simultaneously. Downloads are available here. The first is a revision to the beta version of the upcoming 6.4 which brings all-new developer/designer interface and capabilities. The second release is the latest enhancement of the current 6.3.x version. The new 6.3.15 includes the following changes over 6.3.14: Breaking Changes [1] ---------------------------------------------------------------------------------------------- VWG-6132 - [v6.3.15] Deploy language resource assemblies next to the Gizmox.WebGUI.Forms assembly location Installation puts the resources in the assemblies folder rather thatn the GAC. That way they are copied to the output folder of the app, thus enabling their deployment to the server. Bugs fixes [7] ---------------------------------------------------------------------------------------------- VWG-5714 - Help.ShowHelp of .CHM file with images should show the images VWG-6132 - [v6.3.15] Deploy language resource assemblies next to the Gizmox.WebGUI.Forms assembly location VWG-6401 - Radiobutton: The DoubleClick event should fire. VWG-6409 - The Hourglass (white/blue) Spinner icon should not display to the left on LTR cultures VWG-6452 - Calling/Causing an update on a scrollable container should not reset the scroll position. VWG-6463 - Redrawing a scrollable container does not preserve last scrolling position. VWG-6867 - Listbox: The Items selection in run time should be work correctly Enhancements [1] ---------------------------------------------------------------------------------------------- VWG-6610 - Visifire - Add a click event handler on the graph

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  • Installing LBP 2900 ubuntu -> libs folders wrong?

    - by Peter Smit
    I am trying to get my Canon LBP2900 printer to work on Ubuntu 11.10 64 bit. What I have done is try to follow the steps on https://help.ubuntu.com/community/CanonCaptDrv190 So I downloaded the version 2.3 driver and tried to convert the rpm files to debian and installed them sudo alien cndrvcups-capt-2.30-1.x86_64.rpm cndrvcups-common-2.30-1.x86_64.rpm sudo dpkg -i cndrvcups-capt-2.30-1.x86_64.deb cndrvcups-common-2.30-1.x86_64.deb restarted cups and try to install the printer with lpadmin: sudo service cups restart sudo /usr/sbin/lpadmin -p LBP2900 -m /usr/share/cups/model/CNCUPSLBP2900CAPTK.ppd -v ccp://localhost:59787 -E What I noticed however that on the step with lpadmin it goes wrong with the error: lpadmin: Bad device-uri scheme "ccp" After trying to trace what has gone wrong, I think I nailed it to the fact that dpkg installed a file /usr/lib64/cups/backend/ccp instead of /usr/lib/cups/backend/ccp Checking the original rpm with archive manager shows indeed that /usr/lib and /usr/lib64 are used, with the backend/cpp file only installed in lib64. As I understand correctly, Ubuntu 11.10 uses /usr/lib32 and /usr/lib instead so the files are installed in the wrong place. Is there an automated method of converting the rpm/deb files with the wrong lib structure to one with the right lib structure for ubuntu 11.10? Or am I completely on the wrong track for getting my printer installed?

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  • A new CAPTCHA using sentences?

    - by Xeoncross
    I was just thinking about how recaptcha is getting harder when I thought about another posible solution. Images won't last forever so we will need something else some day - like human logic or emotion. Google and others are trying grouping images by category (find the image that doesn't belong) but that requires a large amount of images and doesn't work for the blind. Anyway, what if a massive collection of text was gathered (public-domain books from each language) and a sentence was shown to the user with 1 (or 2) words that were a select box of choices? Only computers that knew correct English/Spanish/German grammar would be able to tell which of the words belonged in the sentence. Would there be any problems with this approach? I would assume that it would be easy enough for anyone that knew the language that the sentense was displayed in to figure out the answer easier than trying to read the reCAPTCHA text. Plus, storing an insane number of sentences would only take a couple gigabytes of space and wouldn't take anywhere near the CPU time creating images/audio takes. In other words, anyone could host their own captcha system with minimal impact on system performance. Is there a problem with this approach? More specifically I'm looking for the main problem with this approach. migrated from stackoverflow

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  • How to fix E: Internal Error, No file name for libc6

    - by Loren Ramly
    How to fix E: Internal Error, No file name for libc6, Like that will show If I do: $ sudo apt-get upgrade or $ sudo apt-get install package This is example : $ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: ginn hplip hplip-data libdrm-dev libdrm-intel1 libdrm-nouveau1a libdrm-radeon1 libdrm2 libgrip0 libhpmud0 libkms1 libsane-hpaio libunity-2d-private0 libunity-core-5.0-5 linux-generic-pae linux-headers-generic-pae linux-image-generic-pae printer-driver-hpcups printer-driver-hpijs unity unity-2d-common unity-2d-panel unity-2d-shell unity-2d-spread unity-common unity-services The following packages will be upgraded: alsa-base firefox firefox-globalmenu firefox-gnome-support firefox-locale-en icedtea-6-jre-cacao icedtea-6-jre-jamvm icedtea-7-jre-jamvm libdbus-glib-1-2 libdbus-glib-1-dev libgnutls-dev libgnutls-openssl27 libgnutls26 libgnutlsxx27 libssl-dev libssl-doc libssl1.0.0 linux-sound-base openjdk-6-jre openjdk-6-jre-headless openjdk-6-jre-lib openjdk-7-jdk openjdk-7-jre openjdk-7-jre-headless openjdk-7-jre-lib openssl sudo 27 upgraded, 0 newly installed, 0 to remove and 26 not upgraded. 3 not fully installed or removed. Need to get 0 B/126 MB of archives. After this operation, 3,072 B of additional disk space will be used. Do you want to continue [Y/n]? y E: Internal Error, No file name for libc6 I have follow instruction from here E: Internal Error, No file name for libssl1.0.0 . Which do: sudo apt-get update sudo apt-get clean sudo apt-get install -fy sudo dpkg -i /var/cache/apt/archives/*.deb sudo dpkg --configure -a sudo apt-get install -fy sudo apt-get dist-upgrade But stuck with same error E: Internal Error, No file name for libc6 when do command sudo apt-get install -fy. And I've been looking on google, but have not been successful until now. Thanks.

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  • Leveraging Code in Ever Bigger Games

    - by ashes999
    Summary: The same way that I continually build complex engines and libraries within a single platform and technology to allow me to build increasingly bigger and better games, how to continue this when development crosses into different platforms? If I switch platforms, how do I leverage past code and experiences? Games are hard to build. Big games are even harder to build. I've decided that to be able to make big games, I need to start building smaller games, and building up an asset base of code, assets (graphics, sounds), tools, and most importantly, game engines, so that I can eventually get there. One game at a time. Let me give an analogy. To build an MMO 3D RPG, I would approach this by building and releasing small games with increasingly more features. This could entail, for example: A simple 2D game A tile-based game A game with RPG elements (items, equipment, monsters, battle) A full-fledged RPG A 3D RPG The problem now is if I have to change platforms or tools, I don't know how to leverage past code-bases (and experience) to start with a mature product. Right now, I'm writing Silverlight (FlatRedBall) games. Let's say I stick with this for ten years, and then suddenly decide to write a PS6 game, which is in a different programming language entirely. Granted, I have ten years of game-development experience (and correspondingly ten years of professional software development experience from my day job) to back me up. But I would still like some way to transplant that 2D RPG engine into the new programming language, or else leverage it somehow. Is this even possible? What are my options?

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  • Get Trained on Oracle VM Server for x86 in your timezone or location

    - by Antoinette O'Sullivan
    Register now to get trained on Oracle VM Server for x86 in your location or timezone - and frequently in your local language. You have a choice between the 3 day course, Oracle VM Administration: Oracle VM Server for x86, providing you with a wide range of hands-on exercises or a 1 day seminar, Oracle VM with Oracle VM Server for x86 Seminar. And you have a choice of attending these instructor-led courses Live from your desk through Oracle Universities Live Virtual Classes. For these virtual events there are hundreds of scheduled events across many timezones and there is no need to travel! Schedule details available on the Oracle University portal and visit the Virtualization space. In a classroom with a subset of scheduled events shown below:  Where  When  Delivery Language  3 day Hands-On Course      Dusseldorf, Germany  6 August 2012  German  Munich, Germany  9 July 2012  German  Paris, France  17 October 2012  French  Sydney, Australia  3 September 2012  English  Denver, United States  30 July 2012  English  Roseville, United States  25 June 2012  English  1 day Seminar      Paris, France  4 September 2012  French  Roseville, United States  15 June 2012  English  Mexico City, Mexico  20 June 2012  Spanish To find additional classes, go to the Oracle University portal and visit the Virtualization space. Should you not find an event on the schedule that suits you, register your interest for a specific event/date.

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  • Installing LBP 2900 printer -> libs folders wrong?

    - by Peter Smit
    I am trying to get my Canon LBP2900 printer to work on Ubuntu 11.10 64 bit. What I have done is try to follow the steps on https://help.ubuntu.com/community/CanonCaptDrv190 So I downloaded the version 2.3 driver and tried to convert the rpm files to debian and installed them sudo alien cndrvcups-capt-2.30-1.x86_64.rpm cndrvcups-common-2.30-1.x86_64.rpm sudo dpkg -i cndrvcups-capt-2.30-1.x86_64.deb cndrvcups-common-2.30-1.x86_64.deb restarted cups and try to install the printer with lpadmin: sudo service cups restart sudo /usr/sbin/lpadmin -p LBP2900 -m /usr/share/cups/model/CNCUPSLBP2900CAPTK.ppd -v ccp://localhost:59787 -E What I noticed however that on the step with lpadmin it goes wrong with the error: lpadmin: Bad device-uri scheme "ccp" After trying to trace what has gone wrong, I think I nailed it to the fact that dpkg installed a file /usr/lib64/cups/backend/ccp instead of /usr/lib/cups/backend/ccp Checking the original rpm with archive manager shows indeed that /usr/lib and /usr/lib64 are used, with the backend/cpp file only installed in lib64. As I understand correctly, Ubuntu 11.10 uses /usr/lib32 and /usr/lib instead so the files are installed in the wrong place. Is there an automated method of converting the rpm/deb files with the wrong lib structure to one with the right lib structure for ubuntu 11.10? Or am I completely on the wrong track for getting my printer installed?

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  • Project Codenames - Yea or Nay?

    - by rmx
    Where I work, most of our projects have (or at least attempt) descriptive, useful names. However we have a few with names that make no sense: I found that an assembly named WiFi which actually has nothing whatsoever to do with wi-fi, but is a codename. When I asked why, I was told that it's to protect company secrets incase some intern has few too many at the pub on Friday and starts chatting about the brand new 'WiFi' project he's been working on. Its clear that some people find enjoyment in finding silly / amusing codenames for their projects (like in this question). My question is: is it really a good idea to use codenames for your projects or are you better off spending the time to decide upon a descriptive name? My opinion is that in the long-run its better to give your projects relevant names. My reasoning is that if you can't think of a decent name, perhaps you don't really know the requirements well enough. I think there are better ways to 'protect company secrets' and I find it quite confusing when the name does not correlate at all with the content. It's just common sense, surely?! So do you use codenames and what the your reasons for or against this seemingly common, yet annoying (to me at least) practice?

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  • Smarty: Configurable Comments and Code Templates

    - by Martin Fousek
    Hello, today we would like to show you few improvements we have prepared in PHP Smarty Framework for NetBeans 7.3. So let's talk about adjustable toggle comment action and code templates. Configurable Comments As some of you requested we implemented toggle comment action with adjustable behavior. In NetBeans 7.3 you can choose in Options between commenting as a "Smarty comments everywhere" or "Language sensitive comments" in Smarty Templates. Toggle comment language sensitive: Toggle comment as Smarty comment everywhere: Code Templates In NetBeans 7.3 we will provide by default many code templates inside Smarty templates or directly inside Smarty tags. Available should be code templates for all built-in or custom functions and modifiers of Smarty 3.x. Besides that you should be able to define additional custom templates easily in Options -> Editor -> Code Templates for "Smarty Templates" or directly for "Smarty Markup" (which means code templates inside Smarty tag). You can also take advantage of selection's template which are able to wrap your code with chosen Smarty tag. That's all for today. As always, please test it and report all the issues or enhancements you find in NetBeans BugZilla (component php, subcomponent Smarty).

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  • Is there a way to add unique items to an array without doing a ton of comparisons?

    - by hydroparadise
    Please bare with me, I want this to be as language agnostic as possible becuase of the languages I am working with (One of which is a language called PowerOn). However, most languanges support for loops and arrays. Say I have the following list in an aray: 0x 0 Foo 1x 1 Bar 2x 0 Widget 3x 1 Whatsit 4x 0 Foo 5x 1 Bar Anything with a 1 should be uniqely added to another array with the following result: 0x 1 Bar 1x 1 Whatsit Keep in mind this is a very elementry example. In reality, I am dealing with 10's of thousands of elements on the old list. Here is what I have so far. Pseudo Code: For each element in oldlist For each element in newlist Compare If values oldlist.element equals newlist.element, break new list loop If reached end of newlist with with nothing equal from oldlist, add value from old list to new list End End Is there a better way of doing this? Algorithmicly, is there any room for improvement? And as a bonus qeustion, what is the O notation for this type of algorithm (if there is one)?

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  • "io: postinst-must-call-ldconfig" when creating a package

    - by egarcia
    I'm trying to create an ubuntu .deb package for the (pretty awesome) Io Language. I am not the developer of that language, so I'm not familiar with its sourcecode yet. This is my first attempt at creating a .deb file. In order to create the .deb, I'm following these instructions: http://www.webupd8.org/2010/01/how-to-create-deb-package-ubuntu-debian.html So far I've been able to create a .deb file (io_2010.06.01-1_amd64.deb) and a changes file (io_201.06.01-1_amd64.changes). I'm using lintian to check the changes file, and it reports an issue I don't know how to resolve: $ lintian -Ivi io_2010.06.01-1_amd64.changes ... (lots of messages) I: io: no-symbols-control-file usr/lib/libiovmall.so I: io: no-symbols-control-file usr/lib/libgarbagecollector.so I: io: no-symbols-control-file usr/lib/libbasekit.so E: io: postinst-must-call-ldconfig usr/lib/libiovmall.so N: N: The package installs shared libraries in a directory controlled by the N: dynamic library loader. Therefore, the package must call "ldconfig" in N: its postinst script. N: N: Refer to Debian Policy Manual section 8.1.1 (ldconfig) for details. N: N: Severity: serious, Certainty: certain N: N: Removing /tmp/OYuNShEHYz ... I've read the debian manual 8.8 section. I think I understand what the problem is (I need to make sure that ldconfig is invoked "somewhere", possibly on a place called "posinst") but I don't know how to resolve it (i.e. where this "posinsts" file is and how should I change it). The current way of installing Io in Ubuntu is basically running sudo make install and then sudo ldconfig. Maybe the makefile should be modified so ldconfig is called from it? I don't know. Thanks a lot.

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  • What is a Data Warehouse?

    Typically Data Warehouses are considered to be non-volatile in comparison to traditional databasesdue to the fact that data within the warehouse does not change that often.  In addition, Data Warehouses typically represent data through the use of Multidimensional Conceptual Views that allow data to be extracted based on the view and the current position within the view. Common Data Warehouse Traits Relatively Non-volatile Data Supports Data Extraction and Analysis Optimized for Data Retrieval and Analysis Multidimensional Views of Data Flexible Reporting Multi User Support Generic Dimensionality Transparent Accessible Unlimited Dimensions of Data Unlimited Aggregation levels of Data Normally, Data Warehouses are much larger then there traditional database counterparts due to the fact that they store the basis data along with derived data via Multidimensional Conceptual Views. As companies store larger and larger amounts of data, they will need a way to effectively and accurately extract analysis information that can be used to aide in formulating current and future business decisions. This process can be done currently through data mining within a Data Warehouse. Data Warehouses provide access to data derived through complex analysis, knowledge discovery and decision making. Secondly, they support the demands for high performance in regards to analyzing an organization’s existing and current data. Data Warehouses provide support for an organization’s data and acquired business knowledge.  Within a Data Warehouse multiple types of operations/sub systems are supported. Common Data Warehouse Sub Systems Online Analytical Processing (OLAP) Decision –Support Systems (DSS) Online Transaction Processing (OLTP)

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  • OSB and Ubuntu 10.04 - Too Many Open Files

    - by jeff.x.davies
    When installing the latest Oracle Service Bus (11gR1PS3) onto my Ubuntu 10.04 system, the Eclipse IDE was complaining about there being too many open files. The Oracle Service Bus and the Oracle Enterprise Pack for Eclipse (aka OEPE) do make use of ALOT of files. By default, Ubuntu will restrict each user to 1024 open files. A much more realistic number for OSB development is 4096. Changing the file limit in Ubuntu is fairly simple (if arcane). You will need to modify two different files and then restart your server. First, you need to modify the limits.conf file as the root user. Open a terminal window and enter the following command: sudo gedit /etc/security/limits.conf Add the following 2 lines to the file. The asterisk simply means that the rule will apply to all users. * soft nofile 4096 * hard nofile 4096 Save your changes and close gedit. The second file to change is the common-session file. Use the following command: sudo gedit /etc/pam.d/common-session Add the following line: session required pam_limits.so Save the file and exit gedit. Restart your machine. You shouldn't have any more problems with too many open files anymore.

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  • Why isn't Java used for modern web application development?

    - by Cliff
    As a professional Java programmer, I've been trying to understand - why the hate toward Java for modern web applications? I've noticed a trend that out of modern day web startups, a relatively small percentage of them appears to be using Java (compared to Java's overall popularity). When I've asked a few about this, I've typically received a response like, "I hate Java with a passion." But no one really seems to be able to give a definitive answer. I've also heard this same web startup community refer negatively to Java developers - more or less implying that they are slow, not creative, old. As a result, I've spent time working to pick up Ruby/Rails, basically to find out what I'm missing. But I can't help thinking to myself, "I could do this much faster if I were using Java," primarily due to my relative experience levels. But also because I haven't seen anything critical "missing" from Java, preventing me from building the same application. Which brings me to my question(s): Why is Java not being used in modern web applications? Is it a weakness of the language? Is it an unfair stereotype of Java because it's been around so long (it's been unfairly associated with its older technologies, and doesn't receive recognition for its "modern" capabilities)? Is the negative stereotype of Java developers too strong? (Java is just no longer "cool") Are applications written in other languages really faster to build, easier to maintain, and do they perform better? Is Java only used by big companies who are too slow to adapt to a new language?

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  • Is Linq having a mind-numbing effect on .NET programmers?

    - by Aaronaught
    A lot of us started seeing this phenomenon with jQuery about a year ago when people started asking how to do absolutely insane things like retrieve the query string with jQuery. The difference between the library (jQuery) and the language (JavaScript) is apparently lost on many programmers, and results in a lot of inappropriate, convoluted code being written where it is not necessary. Maybe it's just my imagination, but I swear I'm starting to see an uptick in the number of questions where people are asking to do similarly insane things with Linq, like find ranges in a sorted array. I can't get over how thoroughly inappropriate the Linq extensions are for solving that problem, but more importantly the fact that the author just assumed that the ideal solution would involve Linq without actually thinking about it (as far as I can tell). It seems that we are repeating history, breeding a new generation of .NET programmers who can't tell the difference between the language (C#/VB.NET) and the library (Linq). What is responsible for this phenomenon? Is it just hype? Magpie tendencies? Has Linq picked up a reputation as a form of magic, where instead of actually writing code you just have to utter the right incantation? I'm hardly satisfied with those explanations but I can't really think of anything else. More importantly, is it really a problem, and if so, what's the best way to help enlighten these people?

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  • Duplicate content appearing for multi lingual sites

    - by Rocky Singh
    I have a site which has a default url say "http://www.blahblah.com/" (which is default in english language). In my site there is support for multi languages. I am having few links at my home page say "English" "French" "Spanish" etc. and on clicking these links user is redirected to these links: http://www.blahblah.com/en-us/ (English) http://www.blahblah.com/fr-ca/ (French) http://www.blahblah.com/spanish-culture/ (Spanish) and based on culture in the url I am showing the content accordingly to end users in their desired language. Now, this was how my site is. The issue I am getting is with SEO. I noticed Google is considering (I checked via Google web masters) my site pages as duplicate like: 1. http://www.blahblah.com/documents/ and http://www.blahblah.com/en-us/documents/ 2. http://www.blahblah.com/news/ and http://www.blahblah.com/en-us/news and similarly all the pages are considered as a duplicate content in Google webmasters tools. I am worried of this, since I think my site is getting penalized in ranking because of this. Could you drop some idea how to overcome this situation?

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