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  • is wisdom of what happens 'behind scenes' (in compiler, external DLLs etc.) important?

    - by I_Question_Things_Deeply
    I have been a computer-fanatic for almost a decade now. I've always loved and wondered how computers work, even from the purest, lowest hardware level to the very smallest pixel on the screen, and all the software around that. That seems to be my problem though ... as I try to write code (I'm pretty fluent at C++) I always sit there enormous amounts of time in front of a text-editor wondering how every line, statement, datum, function, etc. will correspond to every Assembly and machine instruction performed to do absolutely everything necessary for the kernel to allocate memory to run my compiled program, and all of the other hardware being used as well. For example ... I would write cout << "Before memory changed" << endl; and run the debugger to get the Assembly for this, and then try and reverse disassemble the Assembly to machine code based on my ISA, and then research every .dll, library file, linked library, linking process, linker source code of the program, the make file, the kernel I'm using's steps of processing this compilation, the hardware's part aside from the processor (e.g. video card, sound card, chipset, cache latency, byte-sized registers, calling convention use, DDR3 RAM and disk drive, filesystem functioning and so many other things). Am I going about programming wrong? I mean I feel I should know everything that goes on underneath English syntax on a computer program. But the problem is that the more I research every little thing the less I actually accomplish at all. I can never finish anything because of this mentality, yet I feel compelled to know everything... what should I do?

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  • Are null references really a bad thing?

    - by Tim Goodman
    I've heard it said that the inclusion of null references in programming languages is the "billion dollar mistake". But why? Sure, they can cause NullReferenceExceptions, but so what? Any element of the language can be a source of errors if used improperly. And what's the alternative? I suppose instead of saying this: Customer c = Customer.GetByLastName("Goodman"); // returns null if not found if (c != null) { Console.WriteLine(c.FirstName + " " + c.LastName + " is awesome!"); } else { Console.WriteLine("There was no customer named Goodman. How lame!"); } You could say this: if (Customer.ExistsWithLastName("Goodman")) { Customer c = Customer.GetByLastName("Goodman") // throws error if not found Console.WriteLine(c.FirstName + " " + c.LastName + " is awesome!"); } else { Console.WriteLine("There was no customer named Goodman. How lame!"); } But how is that better? Either way, if you forget to check that the customer exists, you get an exception. I suppose that a CustomerNotFoundException is a bit easier to debug than a NullReferenceException by virtue of being more descriptive. Is that all there is to it?

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  • table alias (or 'symlink') in mysql

    - by andreash
    Hi there, in MySQL5.1, is there a way to make one table accessible by two different names? I'm thinking about somethink like a symlink on linux filesystems. I know theres the CREATE VIEW myview AS SELECT * FrOM mytable thing, but I don't only need to SELECT from both names, but also delete etc ... You might ask why I want to do this? It's about getting a commercial, closed-source app to work, which is crappily programmed (usually, the table names are all lower-case, but occasionally, they use capitalized names for the same table ...). Oh, that would be another idea: Is there a way to tell MySQL not to care about capitalization of table names (like on Windows filesystems?)? that would also do the trick ... Thanks for your insight! A.

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  • Real-time Image Resize, Cropping and Caching Server Product

    - by Elijah
    I'm investigating what products are out there that will allow you to request images through a HTTP API in arbitrary image sizes. The server would behind a CDN but would still need to be able to handle a fair bit of traffic and be possibly load-balanced. I've been tasked with writing such a service, but I wanted to do some due diligence to see what commercial or open source solutions are out there. Google has not been particularly helpful. It may be because I have been searching for the wrong term. Third-party sites and services are out of the question because of corporate policies.

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  • Saving 16:9 video in Movie Maker without black border

    - by Tschareck
    I'm editing my video in Windows Live Movie Maker from Live Essentials 2011. My source video is from camera and is .mp4 format with size of 1280 x 720. After editing in Movie Maker, I save the movie. And no matter what option I chose, I always end up with .wmv file, that is either 4:3 image with black stripes above and below the video, or 16:9 with black frame all around the image. What settings should I use, to be able to export or save the video in 1280 x 720 without any black border?

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  • Did you know documentation is built-in to usp_ssiscatalog?

    - by jamiet
    I am still working apace on updates to my open source project SSISReportingPack, specifically I am working on improvements to usp_ssiscatalog which is a stored procedure that eases the querying and exploration of the data in the SSIS Catalog. In this blog post I want to share a titbit of information about usp_ssiscatalog, that all the actions that you can take when you execute usp_ssiscatalog are documented within the stored procedure itself. For example if you simply execute EXEC usp_ssiscatalog @action='exec' in SSMS then switch over to the messages tab you will see some information about the action: OK, that’s kinda cool. But what if you only want to see the documentation and don’t actually want any action to take place. Well you can do that too using the @show_docs_only parameter like so: EXEC dbo.usp_ssiscatalog @a='exec',@show_docs_only=1; That will only show the documentation. Wanna read all of the documentation? That’s simply: EXEC dbo.usp_ssiscatalog @a='exec',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='execs',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='configure',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_created',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_running',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_canceled',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_failed',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_pending',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_ended_unexpectedly',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_succeeded',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_stopping',@show_docs_only=1; EXEC dbo.usp_ssiscatalog @a='exec_completed',@show_docs_only=1; I hope that comes in useful for you sometime. Have fun exploring the documentation on usp_ssiscatalog. If you think the documentation can be improved please do let me know. @jamiet

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  • How to tell from what Ubuntu or Debian repository a package comes?

    - by gotgenes
    On a Debian-based system, including Ubuntu, how can one tell which repository a package will be downloaded from, without actually beginning the download? aptitude show and apt-cache info will show the section (e.g., metapackage, base, graphics), but not the repository to which a package belongs (e.g., http://ppa.launchpad.net/mactel-support/ppa/ubuntu or http://us.archive.ubuntu.com/ubuntu/). When installing the package, the actual repository appears during the download (it is printed out in the "downloading from ..." output from apt and similar programs), but how can one obtain information on the repository containing the package (or a specific version of a package) without downloading and installing it first? Additionally, how can one determine the source repository for a package that is already installed?

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  • Realtime file-level mirroring from local NTFS to network drive

    - by hurfdurf
    We have some data collection machines running WinXP. After a new file is written, we would like to immediately copy the new file to network storage (a NetApp CIFS share) automagically. We need realtime or near realtime copies generated (copy upon filehandle close would be fine -- these are not long-running system logs). Two commercial applications I've found so far are MirrorFile and IBM's Tivoli CDP. Are there any reliable open source programs or simple ways to get Shadow Copy to do something similar? Bonus points if it runs as a service.

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  • Windows 7 Line In Delay Issue [closed]

    - by CheeseConQueso
    Not sure if this question should be posted on a different stack exchange site, so if you find that it should not be posted here, please move it. Either way, if you know the solution, please advise. I'm running Windows 7 Pro 32-bit on my Dell Latitude 2100 netbook and I'm having an issue with the line in device/driver/functionality. The device & driver are stock: Driver Date: 7/13/2009 Driver Version: 6.1.7600.16385 I'm almost sure that the manufacturer of the sound card is RealTek. The problem is that there is a delay (when monitoring input) between the source and the speakers. My setup is bass guitar running through a 12' long instrument cable (1/4") with a 1/4" female to 1/8" male adapter into the line in port on the computer. Then the 15' long headphones/line out cable goes into a standard set of powered speakers. How do I get rid of this delay? Thanks for any help.

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  • CentOS 5.5 Package documentation

    - by fthinker
    Usually when I install a common package like PostgreSQL or MySQL or Python etc using Yum it installs the files held within those packages into locations specific to CentOS itself. It may also install scripts specific to CentOS only. These paths may not be the same as the defaults found within the source distributions found on the PostgreSQL, MySQL, Python etc project websites and the scripts are usually unique to CentOS. Recently when I installed PostgreSQL under Ubuntu I found some very nice distribution specific information about how the install was organized and how to use the package in a Ubuntu way. I found this information in /usr/share/doc/ Is there any such information included within CentOS?

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  • BackupPC - are full backups really full when using rsync?

    - by mhost
    Hi, When you run a full backup in backuppc and you use rsync as the transfer method, does it actually transfer the full backup source? Or does it only transfer the changes? The docs seem to imply that it would transfer the full thing and only an incremental would transfer the changes. If this is the case, could I simply use incrementals only, and never do a full backup? The way the backups are stored (using hard links to make each incremental appear full), I would think that this would be the best method. Incrementals will only transfer the changes, yet each backup will appear full. Thanks.

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  • How do I setup a syslog server for my network?

    - by Solignis
    I would like to setup a syslog server to forward all log file from all of my VMs and servers. I really don't much about what is out there. So I turn to the community, Something on Linux is fine, what I want more is alert ability like emails telling me something is not right. If there was something to sort the logs by source that would be cool. Where would I want run the syslog server from? My admin WS or a server/VM? Any input would be wonderful. Thanks in advance.

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  • Natural talent vs experience [on hold]

    - by Tord Johansson Munk
    Hi i have a question for you guys if you had a choice of hiring one of two programmers. One of them is a natural born programming talent, he has been programming since he was 14 year old and he has been programming all sorts of things by him self, 3d renders,games,his own frameworks, he is really good at algorithms and problem solving. He is now about 25 years old and is looking for a job after some unchallenged years of college the only experience he has is working on his own/university stuff and some open source project. This guy spends all his free time programming and has several pet projects at home. The other person is a 37 year old career programmer. He has been programming since he graduated from university at the age of 26 and have been working since then. He did not have an interest in programming before university. During his studies he discovered that programming was fun and challenging but it never was a "passion". During his career he mainly worked with "enterprise" platforms such as .net or javaEE. He mainly have done database business applications and thus is lacking skills of the young talent like abstract problem solving or algorithms. But he know the tools he has been using during the years and is reliable and almost always makes his boss happy. He keeps him self updated in the platform and tools he has and is using. But outside the office walls he don't touch any code at all. Witch one would you hire? Would you favor one of them in certain projects? Do you think that if the young talent learns his tools he will be a better programmer than the older one? Would your decision be different if both of them where lacking a degree? or if only one of them was lacking a degree be the old and experienced or the young genius.

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  • DSA private key format

    - by ansur
    So I used puttygen to generate a DSA private key and then exported that to the OpenSSH format and here's what I got when I ran OpenSSL's asn1parse on it: 0:d=0 hl=4 l= 443 cons: SEQUENCE 4:d=1 hl=2 l= 1 prim: INTEGER :00 7:d=1 hl=3 l= 129 prim: INTEGER :B9916796B7A3EFFD5CA36368186D0ED 193BE7FDD61CC6851174F3E9781A0C0CEA7473E528372F559A1DB2A7E049A9BEFAE2CAAC55527049 2A0CD55B59A48A53BCADD32181F519EA9E6A98EF8EF59DE314A2E69606C728F2F8DEE722B4C67BA6 8EB8A619B6006804F83740F9C74C38136522E7E83F22920AA39822FBDA0DF4D0B 139:d=1 hl=2 l= 21 prim: INTEGER :D832F5B01F075FEC0F162B91982F34D B26A0CC29 162:d=1 hl=3 l= 129 prim: INTEGER :9B73F47AEFF8E39584FD10ACF81CCD5 75C96FC5558A5C94B941EF76318D132007ACAE1EA22E95CE0B13FC7875CE4D4ED33BA639CD8C2AC9 C0A0530FB7786F584A62EBAE5985E1C26ED0D0B9FDD5E8DB0142BE182A4E5359307007060C327FEE C2F8D04EABB37D7B74076EB9BDB4885F627DE85708D5BDBF5177A05721E09A367 294:d=1 hl=3 l= 128 prim: INTEGER :6BD9267D2D1E4546EE05F6CD087F311 93C0EEB13B1E139F5072E900AB2EEF68EEC28BF4D7D6CAE4DEE59005F00BAE07343EE520C217FF6E 7880DC788E4555F78CCB5E89A10CDC71A663DA696C5BC34E296CEB3518D65A79BF00B6D592B1399A 9F0D79AE3F3FB445EE1F2B4B72515F036C8E1D5C7FAD336FD3503874645C5C264 425:d=1 hl=2 l= 20 prim: INTEGER :15295A12325E5F1A6F7243B7BB3BE74 6FE7B76E9 My question is... where is this format described? What does the first 0 integer value mean for example? I guess I could look in the puttygen source code but is there an RFC describing this format or something?

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  • What methods are there to configure puppet to serve resources for multiple environments?

    - by cclark
    I seem to come across two ways for using puppet in multiple environments: 1) Install a puppetmaster in each environment and only update the recipes from source control for that environment when ready to deploy the recipes in that environment. 2) Use one puppetmaster and use a variable in the puppet.conf of each client to specify the environment and then in the puppetmaster specify a different modulepath for each environment and each of those paths is updated to the branch of the recipe repository intended for that environment (e.g. dev, staging, production). Only running one puppetmaster seems like it is one less piece of infrastructure to keep running but there is some additional complexity in the configuration. Are there additional pros or cons to one of these methods or something which I'm missing entirely?

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  • Advanced Experiments with JavaScript, CSS, HTML, JavaFX, and Java

    - by Geertjan
    Once you're embedding JavaScript, CSS, and HTML into your Java desktop application, via the JavaFX browser, a whole range of new possibilities open up to you. For example, here's an impressive page on-line, notice that you can drag items and drop them in new places: http://nettuts.s3.amazonaws.com/127_iNETTUTS/demo/index.html The source code of the above is provided too, so you can drop the various files directly into your NetBeans module and use the JavaFX WebEngine to load the HTML page into the JavaFX browser. Once the JavaFX browser is in a NetBeans TopComponent, you'll have the start of an off-line news composer, something like this: WebView view = new WebView(); view.setMinSize(widthDouble, heightDouble); view.setPrefSize(widthDouble, heightDouble); webengine = view.getEngine(); URL url = getClass().getResource("index.html"); webengine.load(url.toExternalForm()); webengine.getLoadWorker().stateProperty().addListener( new ChangeListener() { @Override public void changed(ObservableValue ov, State oldState, State newState) { if (newState == State.SUCCEEDED) { Document document = (Document) webengine.executeScript("document"); NodeList list = document.getElementById("columns").getChildNodes(); for (int i = 0; i < list.getLength(); i++) { EventTarget et = (EventTarget) list.item(i); et.addEventListener("click", new EventListener() { @Override public void handleEvent(Event evt) { instanceContent.add(new Date()); } }, true); } } } }); The above is the code showing how, whenever a news item is clicked, the current date can be published into the Lookup. As you can see, I have a viewer component listening to the Lookup for dates.

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  • Windows server backup fails at 40%

    - by Abraham Borbujo
    I´m configuring windows server backup as full system backup. It starts fine, but when it´s making system drive (c:) backup it stops at 40% every time i try. It only backups 7.28 GB of the total 18.19 GB. I tried changing destination drive and also checking c: filesystem in order to find any problem, but it seems to be ok and the problem is still the same. I got a message telling that the backup is completed with warnings. The warning details says that it didn´t complete backup because of input/output error in source or destination. Thanks for your help.

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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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  • Server Backup Solutions - compiling?

    - by Webnet
    I've been researching backup solutions for a LAMP environment to backup our databases and files alike. I'm looking for open source with a UI (so I'm less likely to screw it up). I downloaded http://www.bacula.org/en/ and a few others but they all talk about compiling first.... this doesn't seem like something I should need to do.... is there a linux package that maybe handles backups that I don't know about? I should also specify I'm looking to setup a backup server which backs up from several locations.

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  • Facebook - Isn't this a big vulnerability risk for users? (After Password Change)

    - by Trufa
    I would like to know you opinions as programmers / developers. When I changed my Facebook password yesterday, by mistake I entered the old one and got this: Am I missing something here or this is a big potencial risk for users. In my opinion this is a problem BECAUSE it is FaceBook and is used by, well, everyone and the latest statistics show that 76.3% of the users are idiots [source:me], that is more that 3/4!! All kidding aside: Isn't this useful information for an attacker? It reveals private information about the user! It could help the attacker gain access to another site in which the user used the same password Granted, you should't use use the same password twice (but remember: 76.3%!!!) Doesn't this simply increase the surface area for attackers? It increases the chances of getting useful information at least. In a site like Facebook 1st choice for hackers and (bad) people interested in valued personal information shouldn't anything increasing the chance of a vulnerability be removed? Am I missing something? Am I being paranoid? Will 76.3% of the accounts will be hacked after this post? Thanks in advance!! BTW if you want to try it out, a dummy account: user: [email protected] (old) password: hunter2

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  • Why does this login fail for user 'Servername\Guest'?

    - by Metassebia
    I install SQL Server 2005 EXPRESS edition on one computer, Computer Name = 'MyServe' and Database name='MyDB',take it as database server. it is configured as both Database and Windows Authentication Mode. with username=sa and password=adminaa. I have application in C#.Net my connection string is ConnectionString = "Data Source=MyServe\SQLEXPRESS;Initial Catalog=MyDB;Integrated Security=True;User ID=sa;Password=adminaa"; when I run the application on the computer called MyServe, the database server, it works well, while when I install the application on different computer, when it tries to connect the database it gives an error called "login failed for user 'MyServe\Guest" what is wrong with configuration in the database server or other mistakes. please help me. thankyou in advance. Metasebia

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  • When I auto-start Supervisord on boot, the [program:start_gunicorn] don't start

    - by Charlesliam
    The [program:start_gunicorn] is running with no error when I manually start supervisord with this setup. [program:start_gunicorn] command=/env/nafd/bin/gunicorn_start priority=1 autostart=true autorestart=unexpected user=nafd_it redirect_stderr=true stdout_logfile=/env/nafd/logs/gunicorn_supervisor.log stderr_logfile=/env/nafd/logs/gunicorn_supervisor_err.log I successfully run this init script for my supervisord. But when I used auto-start init script for supervisord the gunicorn is not running. ]# service gunicorn status gunicorn: unrecognized service What do I need to do to make the [program:start_gunicorn] run when using auto-start supervisord on boot? Here's my gunicorn config. /env/nafd/bin/gunicorn_start #!/bin/bash NAME="nafd_proj" DJANGODIR=/env/nafd/nafd_proj SOCKFILE=/env/nafd/run/gunicorn.sock NUM_WORKERS=1 DJANGO_SETTINGS_MODULE=nafd_proj.settings DJANGO_WSGI_MODULE=nafd_proj.wsgi echo "Starting $NAME as 'NAFD Web Server'" source /env/nafd/bin/activate export DJANGO_SETTINGS_MODULE=$DJANGO_SETTINGS_MODULE export PYTHONPATH=$DJANGODIR:$PYTHONPATH RUNDIR=$(dirname $SOCKFILE) test -d $RUNDIR || mkdir -p $RUNDIR cd /env/nafd/nafd_proj exec ../bin/gunicorn ${DJANGO_WSGI_MODULE}:application --bind=127.0.0.1:8001 \ --name $NAME \ --workers $NUM_WORKERS \ --log-level=debug \` Any idea is really appreciated.

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  • What would cause SQL 2008 Log Reader Agent to fail with "This process could not execute 'sp_replcmds

    - by Rick
    I've seen this error message in other posts. They didn't seem to help resolving our issue. We are trying this with two SQL Server 2008 servers. I backed up my database from the source server and then restored it on our destination server. We setup basic Transaction Replication. The Snapshot Agent is working fine. The Log Reader Agent fails with the error above. Is it most likely a login issue for this job or QueryTimeout?

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  • Visits-PageViews-Bounce Rate-New Visitors-Visit Duration (Google Analytics), which one is top priority for seo?

    - by HOY
    This is the case: My site is getting a lot of trafic from an image (a company logo image) because this image is ranked 1.st in google search results for a company's title. (I have no idea how that happened) This image is must for my website, but it is not relevant with site content so irrelevant people search for the image and finds out about my site, so that I get interesting statistics: http://postimage.org/image/3oyvrjoz9/ Pros: Total Visits & Avg. New Visits Cons: Avg. Page/Visit, Avg. Visit Duration, Bounce Rate In summary I am confused if this image is helpful to my website ? Because I don't know the balance between those 5 statistics P.S: My website is 2 months old, and we are working on seo at the moment Another P.S: Kindly ask you to not provide assumtions, because I also have assumptions, I need real knowledge. Edit: Search Keyword is: arcelik logo Search Site: google.com.tr Search URL: https://www.google.com.tr/search?hl=en&q=arcelik+logo&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.41524429,d.Yms&biw=1366&bih=667&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=oZIDUfutAseVswa9zYHwCw

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  • how to clone a physical "individual partition" vmdk into a "local" (file-based) vmdk?

    - by BJH
    Hello. I have a physical disk with a small (60GB) partition containing my guest OS. The physical disk also contains a large (240GB) block of unpartitioned space. My vmdk is defined as a physical "individual partition". I want to convert the source physical "individual partition" vmdk into a local (file-based) vmdk. The command - vmware-vdiskmanager -r sourcevmdk targetvmdk -t 2 creates a 300GB vmdk that includes both the desired 60GB "individual partition" and the 240GB of useless unpartitioned space ! How can I create a local vmdk with just the individual partition?

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