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• ffmpeg problem in ubuntu (libavcodec.so)

  - by lyuba

  I run Ubuntu and try to use the ffmpeg wrapper in Java from here: http://code.google.com/p/javacv/ It seems to work fine on other systems, but in Ubuntu the project crashes with the following mistake: Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'avcodec_decode_video2': /usr/lib/i686/cmov/libavcodec.so: undefined symbol: avcodec_decode_video2 ffmpeg is working great from the command line, though. JavaCV author recommended me to check this link: http://linux-tipps.blogspot.com/2009/05/pretending-package-is-installed-by.html Probably I'm doing something wrong, but it cannot reinstall libavcodec51 like this. So the questions are: 1. Is those solution above a good one so I should bring it to success somehow? 2. What are the other ways to solve the problem? Thank you for your suggestions in advance!

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• Unit Testing Codeigniter Classes with fooStack - clashes

  - by DrPep

  I'm having 'fun' testing interactions in a CodeIgniter based web app. It seems when running the entire test suite "phpunit AllTests.php" it loads all of the test classes, their targets (Systems under Test) and creates a PHPUnit_Framework_TestSuite instance which presumably iterates over the classes which extend CIUnit_TestCase and runs them. The problem comes where you have multiple classes referencing another class (such as a library). As all the classes are loaded into the same process space, PHP reports "cannot redefine class xyz". Have I missed something here or doing something haenously wrong? In my test class i'm doing something like: include_once dirname(__FILE__).'/../CIUnit.php'; include_once dirname(__FILE__).'/../../libraries/ProductsService.php'; class testProductsService extends CIUnit_TestCase { public function testGetProducts_ReturnsArrayOfProducts(){ $service = new ProductsService(); $products = $service->getProducts(); $this->assertTrue(is_array($products)); } } The problem manifests as I have a controller which does: $this->load->library('ProductsService');

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• Best Practices: How can admin deploy software to 100s of PC ?

  - by Gopal

  Hi ... The Environment: I am working for a college. We have a couple of labs (about 100 PCs) for students. At the end of the semester, the PCs will be full of viruses, corrupt system files, all sorts of illegal downloads etc. (everything you can expect from a student environment). At the end of the semester, we would like to wipe out all the systems and do a clean install (WindowsXP + a set of application suites) to get ready for the next batch of students. Question: Is there any free software that will enable an admin to deploy a clean disk image to all the PCs in one go?

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• Floating point arithmetic is too reliable.

  - by mcoolbeth

  I understand that floating point arithmetic as performed in modern computer systems is not always consistent with real arithmetic. I am trying to contrive a small C# program to demonstrate this. eg: static void Main(string[] args) { double x = 0, y = 0; x += 20013.8; x += 20012.7; y += 10016.4; y += 30010.1; Console.WriteLine("Result: "+ x + " " + y + " " + (x==y)); Console.Write("Press any key to continue . . . "); Console.ReadKey(true); } However, in this case, x and y are equal in the end. Is it possible for me to demonstrate the inconsistency of floating point arithmetic using a program of similar complexity, and without using any really crazy numbers? I would like, if possible, to avoid mathematically correct values that go more than a few places beyond the decimal point.

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• What some good books on software testing/quality?

  - by mjh2007

  I'm looking for a good book on software quality. It would be helpful if the book covered: The software development process (requirements, design, coding, testing, maintenance) Testing roles (who performs each step in the process) Testing methods (white box and black box) Testing levels (unit testing, integration testing, etc) Testing process (Agile, waterfall, spiral) Testing tools (simulators, fixtures, and reporting software) Testing of embedded systems The goal here is to find an easy to read book that summarizes the best practices for ensuring software quality in an embedded system. It seems most texts cover the testing of application software where it is simpler to generate automated test cases or run a debugger. A book that provided solutions for improving quality in a system where the tests must be performed manually and therefore minimized would be ideal.

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• File I/O OS handling

  - by Albinoswordfish

  This isn't a direct coding question but more of a OS handling mechanism. I was reading somebody's previous question regarding C# and file handling. Apparently C# was throwing an exception regarding a file being locked when trying to access this. So my question is, does C# use an internal lock to handle file I/O between processes, or does the OS use some type of mutual exclusion for file I/O? From what I learned about operating systems, well at least unix, is that the OS doesn't implement any type of mutual exclusion for processes trying to access the same file.

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• Aptify (.NET CRM Solution) to MailChimp Synchronization

  - by Cord Blomquist

  I'm trying to determine what is involved in synchronizing MailChimp, the popular bulk email service, with Aptify, the .NET-powered CRM my company uses. MailChimp supplies a .NET wrapper DLL which should make this process much easier. They also advertise a 3rd-party solution: Sync Module for .Net systems - MailChimp Sync Module makes it easier for developers to synchronize their lists from any datasource to mailchimp. It has been developed in C# on the mailchimp .NET wrapper. Check it out here. Provided by Wim De Coninck. What steps would have to take to use these tools to get MailChimp and Aptify playing nicely together?

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• Options for Linux OS executable archive files - self installers

  - by Matt1776

  I am looking to create a web-project that is able to install with a program. The user should be able to download an archive file or tar file, run it (executable), and the setup script would ask for paths and configurable values and then unpack its 'payload' and sorting out the contents for deployment. This would be a Linux version of the MSI installer. Is there such a thing for Linux operating systems? This does not involve kernel level manipulations. All it needs to do is copy directories and files on the filesystem, which should cover about 80% if not more of all the *nix distributions.

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• How to log with Ruby and eventmachine?

  - by Justin

  I'm writing an application using Ruby and the Eventmachine library. I really like the idea of non blocking I/O and event driven systems, the problem I'm running into is logging. I'm using Ruby's standard logger library. Its not that logging takes forever but it seems like something that shouldn't block and it does. Is there a library out there somewhere that extends Ruby's standard logger implementation to be non-blocking or should I just call EM::defer for my logging calls? Is there a way I can make eventmachine do this for me already?

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• How do I detect the environment in Salesforce?

  - by Craig Harris

  I am integrating our back end systems with Salesforce using the web services. I have production and stage environments running on different URLs. I need to be able to have the endpoint of the web service call be different depending on whether the code is running in the production or sandbox Salesforce instance. How do I detect the environment. Currently I am considering looking up a user to see if there user name ends in 'devsandbox' as I have been unable to identify a system object that I can query to get the environment. Further clarification: The location I need to determine this is within the Apex code that is invoked when I select a button in Salesforce. My custom controller needs to know if it running in the production or sandbox Salesforce environment.

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• Industry Reports on Source Control Tools

  - by Kent Boogaart

  Hi, I'm looking for independent industry reports that compare and contrast the various source control tools out there. In particular, I care about Clearcase vs Sourcesafe vs SVN, but if the report includes other SCM systems that's fine. I need this for a client who wants to get a feel on exactly what they stand to gain switching to SVN (yes, from Clearcase and VSS). In other words, something I can use to sell it to their business. I'm hoping some case studies have been done on developer productivity with these tools and resultant reports made freely available. Thanks, Kent

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• Is there a workaround to Safari's/Opera's bug that you can't tab through hyperlinks?

  - by scunliffe

  In IE, Firefox, Chrome and most Windows-based interfaces that I've used, the Tab key can be used to navigate from one form field or hyperlink to the next (e.g. "actionable" items) (note: I have not tested on other Operating Systems) However Safari and Opera skip all hyperlinks in a web page when tabbing. IMHO its a usability bug but I digress. Is there a workaround/hack to make Safari and/or Opera navigate through these links? I've noticed that Opera will accept the tabindex attribute if set e.g. tabindex="0" thus maintaining the links "index" within the flow of the DOM on the page... but Safari does not want to accept this. For those interested, this bit of jQuery will make all the hyperlinks clickable. //Make links 'tab-able' in Opera $(document).ready(function(){ if($.browser.opera){ $('a[href]').attr('tabindex', 0); } }); ...and although this seems to work for Opera... is there a better workaround?

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• http sniffer not working in a LAN setting

  - by trinity

  Hi , I wrote a http sniffer program , first ran it in my standalone pc < fedora OS , and it worked well. And when i tried this in a LAN setting < bus-LAN , fedora OS again , and set the eth0 to promisc mode , the program captures only the URLs browsed by the system in which it is running , but not the ones browsed in neighbouring systems.. Am i missing something here.. i've heard people talk about " setting up subnets " , " use routers / additional ethernet cards " etc , but i dont really understand / know how to do / or even if i should be doing anything of that sort.. please help ..

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• Continuous Integration or Publishing System

  - by Chris M

  I've been testing Hudson for a few days now and for PHP projects it seems ok; What I need though is a system that will allow me to publish an SVN tag to an FTP folder without adding a pile of rubbish on the end; hudson gets overexcited and adds a pile of folders to the export. Are their any other decent systems; it needs to be simple to use as this will eventually fall under the control of 'admins' in order to meet sox compliance (aka the man with the gun cant pull the trigger). Basic Requirements: Must be free and downloadable to a server (FTP's internal only here) Needs to be able to interact with SVN Needs to be able to publish to FTP Needs matrix login permissions (or AD if its something that can go on IIS) Needs to be auditable (logging) Tell me if im not being clear enough here; thanks. Chris

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• Source control products that support linked/shared files?

  - by Ian Boyd

  We're interested in moving from a source control system that supports the concept of shared or linked files. A shared file means: a file modified in one project, is automatically updated changed in every other project that uses that same file. It does this without a developer having to request it, reverse-integrate it, ask for it, or even want it. We're trying to see if any other commonly used source-control systems can meet our needs, and include linked or shared files. My limited research shows that: Team Foundation Server doesn't support sharing files Subversion doesn't support sharing files (including Externals) CVS doesn't support sharing files (including Modules) Anything else? (besides our current source control product, obviously) References Subversion and shared files across repositories/projects? How to share files between CVS projects? Will TFS ever support shared files for projects under source control?

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• From admin to dev [closed]

  - by Terry

  Recently a friend of mine had gone from a high level NOC position to a developer. Before that he was just doing the help desk stuff. He has no degree, only the usual MIS/networking certifications and as far as I know only tinkers with code on the weekends. I can see where in some scenarios having a good understanding of configurations, packets, users, OU's, etc would be extremely beneficial to a developer. My question is this, how many full time developers started off this way? Even how many people dual wield the responsibility of developer/systems administrator/network administration?

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• What are the pro and cons of statically linking a library?

  - by Mathieu Pagé

  Hi, I want to release an application I developed as a hobby both for Linux and Windows. This application depends on boost (and possibly other libraries). The norm for this kind of application (a chess engine) is to provide only an executable file and possibly some helper files. I tough it would be a good idea to statically link the libraries so the executable would not have any dependencies. So the end user can just put the executable in a directory and start using it. However, while doing some research online I found some negative comments about statically linking libraries, some even arguing that an application with statically linked libraries would be hardly portable, meaning that it would only run on my system of highly similar systems. So what are the pros and cons of statically linking library? I already know that the executable will be bigger. But I can't see why it would make my application less portable.

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• Link aggregation with freebsd8 and a cicso 3550, what am i doing wrong?

  - by Flamewires

  Hey, I am trying to setup Link Aggrigation with LACP (well, anything that provides increased bandwidth and failover using my setup will work). I'm running FreeBSD 8.0 on 3 machines. M1 is running 2 10/100 ethernetcards setup for link aggrigation using lagg. for reference: ifconfig em0 up ifconfig tx0 up ifconfig create lagg0 ifconfig lagg0 laggproto lacp laggport tx0 laggport em0 192.168.1.16 netmask 255.255.255.0 I plugged them into ports 1 and 2 of a Cicso 3550. then ran: configure terminal interface range Fa0/1 - 2 switchport mode access switchport access vlan 1 channel-group 1 mode active (everythings in vlan 1) Now Im able to connect the other computers to other ports on the switch and failover works great, i can unplug cables in the middle of a transfer and the traffic gets rerouted. However, im not noticing any speed increase. My test setup: load balancing: i tried dst and src on the switch, neither seemed to give me a speed increase. I am SCPing 2 500 meg files from the lagg computer to other computers (one each) which are also running 10/100 full duplex cards. I get transfer speeds of about 11.2-11.4 Mbps to a single host, and about half that (5.9-6.2) Mbps when transferring to both at the same time. From what I understood with destination load balancing the router was suppose to balance traffic headed for 1 computer over 1 port and traffic headed for another over a diff(in this case) the other port. With destination-MAC address forwarding, when packets are forwarded to an EtherChannel, the packets are distributed across the ports in the channel based on the destination host MAC address of the incoming packet. Therefore, packets to the same destination are forwarded over the same port, and packets to a different destination are sent on a different port in the channel. For the 3550 series switch, when source-MAC address forwarding is used, load distribution based on the source and destination IP address is also enabled for routed IP traffic. All routed IP traffic chooses a port based on the source and destination IP address. Packets between two IP hosts always use the same port in the channel, and traffic between any other pair of hosts can use a different port in the channel. (Link) What am i doing wrong/what would i need to do to see a speed increase beyond what i could do with just a single card?

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• Is there any way to use getaddrinfo() and freeaddrinfo() and still be the program compatible with le

  - by Sam C.

  Hi, in the Winsock2 library getaddrinfo() and freeaddrinfo() was only added in Windows XP and on. I know how to replace them in legacy systems, but a conditional use depending on the Windows version won't help. The application won't start in 9x with a message saying that it was linked to a missing export in WS2_32.dll. I'm using MinGW to compile and link the code and would like to keep using it. Maybe writing those functions by myself? Thank you very much for everything.

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• Ideal dev/test/QA environment for development

  - by Nick

  I am working to rebuild my company's dev/test/QA environment. We have 10-15 programmers that are involved in a number of projects. They currently all develop locally on their PCs and use the dev environment for testing. We currently do not have a QA environment, so deployments are frequently a pain because bugs are usually found after something has gone live. Here's what I envision: Doing away with everyone's local admin privileges and making everyone develop on a dev server Create a QA environment that is identical to our production systems. This will allow them to test deployments. Create a new test environment that is more locked down than the dev server so that proper testing can be done. What are your thoughts? What is the best way to set up an environment like this? We develop ASP .NET applications using MS Visual Studio 2008 (if that helps).

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• designing an API wrapper for Twitter, Facebook, Youtube etc...

  - by John Stewart

  I am looking at some pointers on how to design a wrapper for these social networking sites. Ideally what I want to do is create a black box where I am able to create an interface for other libraries to call certain functions to interact with these social networking sites. I am planning on using oAuth for most of these sites, I already have this layer designed in PHP. The other layer that I need for these social sites is the ability to push and pull content. For example, the ability to pull feeds for users from each of these networks and then should I cache them on my end? how would I cache all twitter, facebook etc activity feed and be able to account for resync etc? The networks that I am looking at are: Twitter Youtube Facebook LinkedIN Vimeo Flickr I am looking for ideas on how to tackle this in php? Any suggestions, opensource systems that I can learn from?

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• Describe the Damas-Milner type inference in a way that a CS101 student can understand

  - by user128807

  Hindley-Milner is a type system that is the basis of the type systems of many well known functional programming languages. Damas-Milner is an algorithm that infers (deduces?) types in a Hindley-Milner type system. Wikipedia gives a description of the algorithm which, as far as I can tell, amounts to a single word: "unification." Is that all there is to it? If so, that means that the interesting part is the type system itself not the type inference system. If Damas-Milner is more than unification, I would like a description of Damas-Milner that includes a simple example and, ideally, some code. Also, this algorithm is often said to do type inference. Is it really an inference system? I thought it was only deducing the types. Related questions: What is Hindley Miller? Type inference to unification problem

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• Installing JavaFX 2.0 in Eclipse Juno for Mac

  - by Josh

  I'm running Mac OS X 10.6.x (Snow Leopard) right now, so I'm pretty sure that there could be some issues with supported systems, but I'm trying to install JavaFX 2.0 (or 2.1.x) in Eclipse Juno for Java EE (version 3.8). I have already installed the e(fx)clipse plugin, but I'm not sure if I'm downloading the right JavaFX .zip file from the Oracle website. I downloaded the JavaFX 2.2 beta release because it seemed to be the only release available for OS X, but I could be wrong. Once I download this archive, I'm not exactly what to do with it/where to place it so that Eclipse recognizes it as the JavaFX 2.2 SDK. I know that I have to go into preferences and set the location of the SDK file, but there doesn't seem to be any selectable .jar file or folder to set it to. Am I doing something wrong here? Any help is appreciated. Edit: I worked around the issue by setting the SDK location to the location of the downloaded JavaFX 2.2 SDK in the JavaFX section in the preferences tree.

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• What ERP system should I choose?

  - by Zakaria

  Hi everybody, I want to learn an ERP system.I think the best one is SAP. But I noticed that many open source systems do exist. What is the best open source ERP that includes CRM? I found Ofbiz, OpenERP, OpenBravo, etc ... but I would really avoid testing them one by one ... What I need is a tool that can do what SAP ERP can do but for free. Thank you very much, Regards.

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• Developer workload management software: recommendations?

  - by PaddyC

  In my place, we use two issue tracking tools, one for production bugs, and another for issues on projects in development. These tools are good for managers. However, at an individual level, other work can also arrive through desk visits, email, or the phone, and those allocating the work aren't always interested in issue tracking systems. I've recently rolled off an 18-month project where I got into a cycle of overtime, and I found that I didn't always have good visibility of all work assigned to me. As a result, I was always very busy, and felt constantly laden down with work, but didn't have the clear data to show my manager (or, ironically, the time to stop and gather the information!). A handwritten list, updated at the end of each day, is a good start, but can anyone recommend better tools to help me get a clear view of my own workload? Ideally, I'm thinking of software tools for developers, which could incorporate estimates, but all suggestions welcome. Thanks, Paddy

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