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Articles indexed Friday March 26 2010

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  • Hashing the state of a complex object in .NET

    - by Jan
    Some background information: I am working on a C#/WPF application, which basically is about creating, editing, saving and loading some data model. The data model contains of a hierarchy of various objects. There is a "root" object of class A, which has a list of objects of class B, which each has a list of objects of class C, etc. Around 30 classes involved in total. Now my problem is that I want to prompt the user with the usual "you have unsaved changes, save?" dialog, if he tries to exit the program. But how do I know if the data in current loaded model is actually changed? There is of course ways to solve this, like e.g. reloading the model from file and compare against the one in memory value by value or make every UI control set a flag indicating the model has been changed. Now instead, I want to create a hash value based on the model state on load and generate a new value when the user tries to exit, and compare those two. Now the question: So inspired of that, I was wondering if there exist some way to generate a hash value from the (value)state of some arbitrary complex object? Preferably in a generic way, e.g. no need to apply attributes to each involved class/field. One idea could be to use some of .NET's serialization functionality (assuming it will work out-of-the-box in this case) and apply a hash function to the content of the resulting file. However, I guess there exist some more suitable approach. Thanks in advance.

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  • Is Using Python to MapReduce for Cassandra Dumb?

    - by UltimateBrent
    Since Cassandra doesn't have MapReduce built in yet (I think it's coming in 0.7), is it dumb to try and MapReduce with my Python client or should I just use CouchDB or Mongo or something? The application is stats collection, so I need to be able to sum values with grouping to increment counters. I'm not, but pretend I'm making Google analytics so I want to keep track of which browsers appear, which pages they went to, and visits vs. pageviews. I would just atomically update my counters on write, but Cassandra isn't very good at counters either. May Cassandra just isn't the right choice for this? Thanks!

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  • Doing ajax with Jquery.

    - by user272899
    I have been loading content with ajax and all works fine. Here is my code $(document).ready(function() { //Load a-z.php //Timestamp resolves IE caching issue var tsTimeStamp= new Date().getTime(); $.post('../../includes/categories/a-z.php', {action: "post", time: tsTimeStamp}, function(data){ $('#moviescontainer').html(data).slideDown('slow'); }); return true; }); My data inside a-z.php requires Javascript for it's content and when I load a-z.php onto my page the javascript doesn't work. I am quessing that I need to link the relevant files to a-z.php and then load it via ajax. Doesn't this kind of defeat the object of ajax?? That means that I will be loading the js files on the main page and then loading them again when I ajax a-z.php I hope I made some sense.

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  • What is a better way to write this regular expression?

    - by rxgx
    I am converting XML children into the element parameters and have a dirty regex script I used in Textmate. I know that dot (.) doesn't search for newlines, so this is how I got it to resolve. Search language="(.*)" (.*)<education>(.*)(\n)?(.*)?(\n)?(.*)?(\n)?(.*)?</education> (.*)<years>(.*)</years> (.*)<grade>(.*)</grade> Replace grade="$13" language="$1" years="$11"> <education>$3$4$5$6$7$8$9</education> I know there's a better way to do this. Please help me build my regex skills further.

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  • Most basic, low power home surveillance system

    - by cbp
    I am thinking of setting up a simple but effective surveillance system for my house that is: Very low powered (preferably no PCs left running out of stand-by mode) Cheap. When motion (or sound) is detected, I would like it to: Send an email/phone alert to me Record and upload video to the web (in case they steal the camera) So I imagine a system where I leave a netbook PC in stand-by mode and have it woken up by a motion detector. This initiates software to send alerts and periodically upload recorded video to the web. The software part is easy for me, but I'm not really a gadget-man so I'd like some advice on using a motion sensor of some sort to wake up the PC. Does anyone have some good advice? I know there are a couple of questions dealing with this topic already (see here: http://superuser.com/questions/3054/looking-for-a-moderately-priced-home-surveillance-setup, and here: http://superuser.com/questions/2929/can-you-suggest-a-great-home-security-setup-anti-burglars-e-t-c) - I am seeking more specific information with this question.

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  • How to set up DHCP-configured access through a Linux box?

    - by marcusw
    I would like an old desktop box to use my laptop as a router to access the internet. Here is my setup: I have one ethernet port in the side of my laptop which I want to use to get internet access to my desktop computer. The laptop is connected to the LAN via a wireless link. Both systems run Linux. The desktop autoconfigures itself using DHCP. The laptop is a Kubuntu system. I do not have any crossover cables, though wireshark on the laptop sees the DHCP requests from the desktop just fine, so I doubt that I need one. What do I have to do to make this work?

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  • How to Detect that Current (Bash) Shell is a (Vi/Vim) Subshell?

    - by Jeet
    From inside Vi/Vim, I can type: :shell to drop into a shell. Is there any way to detect that I am in a Vi-spawned subshell? The environmental variable SHLVL is 2, but that does not tell me explicitly that I am in a Vi/Vim-spawned subshell. On OS X, the following variables are also set: MYVIMRC, VIMRUNTIME, VIM. How universal are these? Can I count on these being set in any system, if and only if I am in a Vi/Vim subshell? If not, is there any portable, robust and hopefully efficient way to tell that I am in a Vi/Vim subshell? Thanks.

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  • Tom Kyte szeminárium Budapesten, 2010. ápr. 19-20.

    - by Fekete Zoltán
    Még lehet jelentkezni Tom Kyte 2010-es budapesti szemináriumára, az itt található linkeken keresztül: - 2010. április 19-20., Budapesten tantermi szeminárium keretében. Témák: The top 10 - no 11 - new features of Oracle; Database 11g; All about binding; Materialized Views, Caching; Effective Indexing; Storage Techniques; Reorganizing objects - when and how. ASK TOM!

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  • Stretching an ADF Faces Component to (near) 100%

    - by Christian David Straub
    In the past, many users would want their component to stretch to fill 100% of a horizontal area. However, to account for scrollbars that may or may not have been there, they would set the percentage to 98%, etc.A much better way to do this is to use the new "AFStretchWidth" style class, which will do this automatically for you.For instance, avoid this:<af:foo inlineStyle="98%" />and instead do this:<af:foo styleClass="AFStretchWidth" />You can learn more about ADF Faces layout management here.

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  • Enabling SSL Requests on Jdev's Integrated Weblogic

    - by Christian David Straub
    Often times you will want to enable SSL access for such things as secure login or secure signup. By default, the integrated WLS that ships with JDev does not listen to SSL requests. However, this is easily fixed.Just navigate to http://127.0.0.1:7101/console. This will deploy the console app where you can configure WLS. By default the login credentials are:username: weblogicpassword: weblogic1Then go to Environment -> Servers -> DefaultServer. Check the "SSL Listen Port Enabled" box and your server will now listen to SSL requests (just make sure to use the listen port that is specified).For added security, you can always check while processing your request that it is going through an SSL connection by first checking HttpServletRequest.isSecure().

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  • Venezuela's Highly Inflationary Economy Means Changes to Financial Statements

    - by Theresa Hickman
    This is a bit of an esoteric topic, but given the number of U.S. Companies (particularly oil companies) that operate and have subsidiaries in Venezuela, I think it is worthy of an honorable mention. As you may or may not know, Venezuela's currency has had some changes over the years. In 2008, the Venezuelan Bolivar became the Bolivar Fuerte which dropped three zeros. So Bs.10,000 became Bs.F.10 and all their bills and coins were changed to reflect this. Then on Jan. 8, 2010, the government devalued the currency by 100%. The conversion from VEF to USD dropped from 2.15 to 4.30. (I always wanted to visit Venezuela; I guess it's time to book my vacation). The SEC recently labeled Venezuela a highly inflationary economy. This means that US companies with investments/subsidiaries in Venezuela will need to apply highly inflationary accounting rules starting on Jan. 1, 2010. In addition, companies need to make more detailed disclosures when the Venezuelan reported balances differ from the actual US dollar denominated balances. In a nut shell, if you formerly used translation, then starting Jan 1 of this year, you must now use remeasurement (or temporal method) to restate your Venezuelan entity's financial statements. See ASC topic 830, Foreign Currency Matters, which states that "[t]he financial statements of a foreign entity in a highly inflationary economy shall be remeasured as if the functional currency were the reporting currency." For you non-accountants that I haven't bored and are still reading at this point, the reason why the SEC is doing this is to ensure financial statements are presented as accurately as possible. Hyperinflationary economies have volatile currencies, such as Venezuela (it's not every day a currency devalues 100% overnight) which can distort financial statements if the local currency (Venezuelan Bolivar Fuerte) is used as the functional currency. To make financial statements more accurate, the reporting currency of the U.S. parent (US dollars) should be used as the functional currency. FASB.orgactually has a nice write-up on this.

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  • SEO Copywriting - Tips on Making Sense to Humans and Google

    This article covers a range of handy tips that you can implement to boost your search engine ratings. It deals with striking the balance between optimising for search engines like Google and making sense to your human visitors. You'll learn a whole range of writing techniques to boost your ranking, along with some behind the scenes tips.

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  • How Google Will Rate Your Site

    Search Engine Optimisation should be a major part of any online businesses marketing strategy. The fact is that nowadays search engines are the first port of call for online shoppers and resultant businesses are forced to optimise to fit these engines.

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  • Online backup services

    - by Ilnur
    Could anybody recommend me free online service for everyday backup of my data. It contain files for about 5-10 GB. I'm looking for DropBox. It's very cool service. But I want to edit settings once, and then backup data automatically (my docs folder, music, photos and others). Any ideas?

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  • Extract domain from url (including the hard ones)

    - by karl
    I'm trying to write (or just find an existing) PHP method that can take a link and extract the url. The trick is, it needs to hold under the weight of strange looking domains like: www.champa.kku.ac.th Looking at this one myself with human eyes, I still guessed it incorrectly: thought the domain would be kku.ac.th but that gives a dns error when visiting. So anyone knows of a good way to reliably extract the domain from url: http://site.com/hello.php http://site.com.uk/hello.php http://subdomain.site.com/hello.php http://subdomain.site.com.uk/hello.php http://www.champa.kku.ac.th/hello.php // and even the one I couldn't tell

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  • xpath/xslt to determine index of context node relative to all nodes of same name?

    - by Geoff
    Given the schema below - with a "query" node as the context, is it possible with xpath/xslt to determine the index of that "query" node relative to all "query" nodes in the document (not position() relative to its immediate siblings). TIA, Geoff <section> <name>About</name> <link>about</link> <questions> <question> <query>Question 1</query> <answer>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In cursus, elit id lacinia semper, ligula nunc rhoncus ante, in euismod tortor nibh dictum tellus.</answer> </question> </questions> </section> <section> <name>Contact</name> <link>contact</link> <questions> <question> <query>Question 1</query> <answer>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In cursus, elit id lacinia semper, ligula nunc rhoncus ante, in euismod tortor nibh dictum tellus.</answer> </question> <question> <query>Question 2</query> <answer>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In cursus, elit id lacinia semper, ligula nunc rhoncus ante, in euismod tortor nibh dictum tellus.</answer> </question> </questions> </section>

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  • IE8 v8 not changing class for a DOM element despite JS function changing the element attribute

    - by Alfabravo
    I have an on-screen keyboard in order to provide a safer input for passwords. The keyboard itself is placed like this: <div class="teclado_grafico" id="teclado_grafico"> <a class="tecla_teclado" onmousedown="teclaAction( this, 'caja_selector'); return false" style="top: 0px; left: 0px;">Q</a> <a class="tecla_teclado" onmousedown="teclaAction( this, 'caja_selector'); return false" style="top: 0px; left: 28px;">W</a> . . . </div> And it has a "Shift button" which fires a JS function with this (I've already tried all that, indeed): if (obj.innerHTML == "Mayus.") { try { MAYUSCULA_ACTIVADO = !MAYUSCULA_ACTIVADO; var tgrafico = document.getElementById("teclado_grafico"); if(MAYUSCULA_ACTIVADO) { // tgrafico.className = "teclado_grafico mayuscula"; // $("#teclado_grafico").removeClass('minuscula').addClass('mayuscula'); // $("#teclado_grafico").attr('class', 'teclado_grafico mayuscula'); // $("#teclado_grafico").attr('className', 'teclado_grafico mayuscula'); tgrafico.setAttribute('className', "teclado_grafico mayuscula") || tgrafico.setAttribute('class', "teclado_grafico mayuscula"); } else { // tgrafico.className = "teclado_grafico minuscula"; // $("#teclado_grafico").removeClass('mayuscula').addClass('minuscula'); // $("#teclado_grafico").attr('class', 'teclado_grafico minuscula'); // $("#teclado_grafico").attr('className', 'teclado_grafico minuscula'); tgrafico.setAttribute('className', "teclado_grafico minuscula") || tgrafico.setAttribute('class', "teclado_grafico minuscula"); } } catch (_E) { //void } return; } The associated CSS is like this: .mayuscula a.tecla_teclado{ text-transform: uppercase; } .minuscula a.tecla_teclado{ text-transform: lowercase; } It works on every single browser I've tried. IE 6, 7; Opera 10; GChrome; FF 3, 3.5 and 3.6; Safari 4,... but in IE8 v8 (strict mode) the class is not changed! I mean, debuggin' with the IE8 tools allows one to see that the attribute className is there and it changes... but the user does not see the letters changing from uppercase to lowercase, to uppercase again. I just don't know how to handle this... I had complains about the client using IE6... now they updated their stuff and this shows up. Any help will be reaaaaly helpful!

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  • .net 4.0 with Code Access Security NetFx40_LegacySecurityPolicy won't work

    - by user210903
    Hi- I'm trying to use an external library DevExpress.XtraTreeList.v8.1.dll in my vsto office addin built using VS2010 beta 2. I am getting the following compile time error: DevExpress.Utils.AppareanceObject threw an exception -- System.NotSupportedException. The error message goes on to say that for compatibility reasons I can use the NetFx40_LegacySecurityPolicy switch. I've tried putting this config variable in all of the following locations: 1) my applications config file. 2) C:\Windows\Microsoft.NET\Framework\v4.0.21006\msbuild.exe.config 3) C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\dev.exe.config None of these have resolved the problem. Here were the references I've used. re-enable cas msdn.microsoft.com/en-us/library/ee191568(VS.100).aspx How do I get rid of this error so I can build the application in vs 2010?

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