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• Android Development: MVC vs MVVM

  - by Mel

  I've started coding for android and I'm having difficulty trying to properly partition my code. I always end up with a very tight coupling between my UI logic and the actual controls I use to represent them. I have background in both WPF MVVM and ASP.net MVC so I'm familiar with those patterns. After some digging, I found Android Binding. It seems nice and fits nicely with my WPF background. However, it bugs me that its not built in. I'm pretty sure that the android makers have thought of this when designing the android programming interface. So my question is, what is the best practice pattern to use when developing in android, if any. I have looked and looked at their site but didn't find anything...

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• What's your favorite stupid error message?

  - by Robusto

  Here's my candidate, just encountered, from an automated Java build. I just had to share it. "Composite step 'master' failed due to unsatisfication of success condition." In other words, it failed because it didn't succeed. Uh, thanks. I feel so much more ... what's the word I'm looking for here? Ah, enlightened. I think it would be fun to hear yours, and I'm sure you have plenty. I really enjoyed the best programmer jokes that appeared here earlier, so maybe this will bring a few smiles and lighten the load in a similar fashion. (I searched for something similar on SO, but didn't find anything.)

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• Inline code within HEAD section of ASP Web Form

  - by geekrutherford

  Today I needed to include inline code within the HEAD section of an Web Form in order to dynamically include stylesheets based on the theme set for the application.   Below is an example:      <link href="../../Resources/Themes/<% = Page.Theme %>Grid.Default.css" rel="stylesheet" type="text/css">   Upon saving and viewing the page I noted that the code was not being interpreted and instead was being treated as a string literal.  How to get around it?  Add a panel control in the HEAD section and place the links to the stylesheets as in the example above within the panel.  For whatever reason, ASP.NET does not want to interpret inline code in the HEAD section but will allow you to add .NET controls in the HEAD section.

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• Recursive Syntax in Oslo

  - by Kevin Lawrence

  I'm writing my first DSL with Oslo and I am having a problem with a recursive syntax definition. The input has sections which can contain questions or other sections recursively (composite pattern) like this: Section: A Question: 1 Question: 2 Section: B Question: 1 End End My definition for a Section looks like this syntax Section = "Section:" id:Text body:(SectionBody)* "End Section"; Which works (but doesn't handle recursive sections) if I define SectionBody like this syntax SectionBody = (Question); but doesn't work with a recursive definition like this syntax SectionBody = (Question | Section); What am I missing?

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• Simple but efficient way to store a series of small changes to an image?

  - by finnw

  I have a series of images. Each one is typically (but not always) similar to the previous one, with 3 or 4 small rectangular regions updated. I need to record these changes using a minimum of disk space. The source images are not compressed, but I would like the deltas to be compressed. I need to be able to recreate the images exactly as input (so a lossy video codec is not appropriate.) I am thinking of something along the lines of: Composite the new image with a negative of the old image Save the composited image in any common format that can compress using RLE (probably PNG.) Recreate the second image by compositing the previous image with the delta. Although the images have an alpha channel, I can ignore it for the purposes of this function. Is there an easy-to-implement algorithm or free Java library with this capability?

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• Tempescope Displays Weather by Recreating It

  - by Jason Fitzpatrick

  Yesterday we showed you an umbrella stand that signals raining/clear skies by color, today we have something even more interesting: an ambient desktop weather station that recreates the outside weather. The Tempescope pulls down the current weather report from Weather Underground’s API and feeds it to an Arduino board which in turn controls the device. When it’s raining, it pumps water down to simulate rain in the chamber. When there is lightening, LEDs flash. When there is cloud cover, an ultrasonic generator creates a fine mist inside the cylinder. Finally, on sunny days the entire thing glows warmly. To say that we want one would be an understatement. Hit up the link below to read more about the project, the display modes, and to peek inside the device. Prototyping “Tempescope”, An Ambient Weather Display [via Hack A Day] How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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• Dynamic User Specific CSS Selection at Run Time

  I had a cool question while I was at MIX. A developer needed the ability to have his site render pages using a CSS file selected based on some user specific criteria. ASP.NET 4 controls generate CSS friendly output and more and more we web developers are using CSS for layout etc. Using multiple CSS files in our site wide templates we can not only provide different aesthetic experiences but we can chage the style based on the device type (Printer ot Phone) or the special needs of the end user...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Creuna Platform

  - by csharp-source.net

  Creuna Platform is a an open source web application framework based on Microsoft .NET and is fully written in C#. The aim for Creuna Platform is to make life easier for system developers by providing a highly competent component toolkit that increases the productivity and quality of a system. The framework contains components for data access, configuration handling, messaging and a broad range of utility classes, controls and services. The framework also has several components for the EPiServer CMS. Creuna Platform is licensed under Affero GNU General Public License Version 3.

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• Minimum brightness level is brighter than the levels just above it

  - by greggory.hz

  I'm using a macbook pro 8,1. When I use the brightness keys on the keyboard, decreasing the brightness works until it reaches the lowest brightness level. At that point (when on the lowest level), the brightness is something like 70 or 80% instead of 0-10% (or whatever it usually is). All the other levels are fine. How can I adjust/calibrate these brightness controls? PS: I'm currently using 12.04 but I've had the same issue no later than 11.10 (and I'm fairly confident it was present in 11.04 as well). UPDATE: If I go to System Settings and select "Brightness and Lock" the exact same thing happens, but there is more fine grained control of the brightness. It goes to completely black when the dial is about 10% from the left edge. When it passes that point, anywhere inside that left 10% appears to be about 70 - 80% brightness (there's no change regardless of where the dial is in this section).

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• Create named criteria in EJB Data control

  - by shantala.sankeshwar

  This article gives the detailed steps on creating named criteria in EJB Data control.Note that this feature is available in Jdev version 11.1.2.0.0Use Case DescriptionSuppose we have defined an EJB Entity Object & we would like to filter the Entity object based on some criteria,then this filtering can be achieved by creating named criteria in EJB Data Control.Implementation stepsLet us suppose that we have created Java EE Web Application with Entities from Emp table Create session bean,generate data control for the same Edit empFindAll in DataControls.dcx fileCreate simple Named Criteria: deptno>=20Create on '+' icon to create Named Criteria:Refresh the Data Controls & create a new jspx page.Drop EmpCriteria as ADF Query Panel with TableRun the page,click on search button & we will see that Emp table shows filtered records

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• How to attach a sample grabber to the playcap sdk sample

  - by Mr Bell

  I want to get access to a webcam's frame image data so I can composite it with some other data. The playcap sample in the windows sdk directshow folder can show you a window streaming the webcam, but doesn't demonstrate access to the bytes. Someone mentioned that I could use a samplegrabber filter attached to a null rendered to gain access to the frame data. Unfortunately I haven't the first clue how to do this. How can I modify the playcap sample to attach a sample grabber and access the frame bytes? visual studio 2008 c++

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• quantity of measurable units design pattern

  - by Berryl

  Hello I am thinking through a nice pattern to be useful across domains of measurable units (ie, Length, Time) and came up with the following use case and initial classes, and of course, questions! 1) Does a Composite pattern help or complicate? 2) Should the Convert method(s) in the ComposityNode be a separate converter class? All comments appreciated. Cheers, Berryl Example Use Case: var inch = new ConvertableUnit("inch", 1) var foot = new ConvertableUnit("foot", 12) var imperialUnits = new CompositeConvertableUnit("imperial units", .024) imperialUnits.AddChild(inch) imperialUnits.AddChild(foot) var meter = new ConvertableUnit("meter", 1) var millimeter = new ConvertableUnit("millimeter ", .001) var imperialUnits = new CompositeConvertableUnit("metric units", 1) imperialUnits.AddChild(meter) imperialUnits.AddChild(millimeter) var oneInch = new Quantity(1, inch); var oneFoot = new Quantity(1, foot); oneFoot.ToBase() // "12 inches" var oneMeter = new Quantity(1, meter); oneInch.ToBase() // .024 meters Possible Solution ConvertableUnit : Node double Rate string Name Quantity ConvertableUnit Unit double Amount CompositeConvertableUnit : Node ISet<ConvertableUnit> _children ConvertableUnit BaseUnit {get{ return _children.Where(c=>c.Rate == 1).First() } } Quantity ConvertTo(Quantity from, Quantity to) Quantity ToBase(Quantity from);

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• ASP.NET Pager Supports Keyboard Navigation - v2010 vol 1

  Here’s a feature for all your users who are keyboard ninjas. The ASPxPager control now provides better keyboard support - increasing both web site usability and accessibility. If you are using a DevExpress ASP.NET Pager control - either standalone or integrated into our data-aware controls like the ASPxGridView – then you can now navigate to the previous/next page by pressing the CTRL+ARROW key combinations. To see a standalone version of our ASP.NET Pager, check out this slick movie-theme...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• EISK&ndash;Employee Info Starter Kit 5.0

  - by Tiago Salgado

  Employee Info Starter Kit is an open source project that is highly influenced by the concept ‘Pareto Principle’ or 80-20 rule, where it is targeted to enable a web developer to gain 80% productivity with 20% of effort with respect to learning curve and production. It is intended to address different types of real world challenges faced by web application developers when performing common CRUD operations. Using a single database table ‘Employee’, the current release illustrates how to utilize Microsoft ASP.NET 4.0 Web Form Data Controls, Entity Framework 4.0 and Visual Studio 2010 effectively in that context.   More information on codeplex project site.

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• Can't center dialog window above main window when using Glade (Quickly)

  - by Niklas

  I have a dialog opening when I press a button in my application and I want it to center above the application's main window, but I can't find a way to do this. I'm using Quickly (Python) and Glade. In Glade I've tried the following settings: Window Type = Popup Modal = Yes Window Position = Center on Parent But I simply can't get the behaviour I'm after. When using the "Window Type" option "Top level" the dialog opens in the center of the screen. When I use "Window Type" = "Popup" it opens in the very top left corner, with the window controls unaccessible. I know this must be a very basic setting but I've just started developing with GTK and Python so I obviously managed to miss this. Thanks for any advice! :)

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• Windows Phone 7 Developer Tools &ndash; January 2011 Update

  - by TechTwaddle

  Note: I am currently in the process of relocating my blog from http://www.geekswithblogs.net/techtwaddle to my new address at http://www.techtwaddle.net I suggest you point your feed readers to the new address as I slowly transition to my new shared-hosted, ad-free wordpress blog :) If you haven’t heard already, the Jan 2011 update of the windows phone 7 developer tools is out, er, in Feb. You can download the installation files from here, http://www.microsoft.com/downloads/en/details.aspx?FamilyID=49b9d0c5-6597-4313-912a-f0cca9c7d277 The performance increase with the new emulator is clearly noticeable and the first time deploy is real quick! The emulator image should also be a precursor to the windows phone 7 OS update that we’ve been waiting for ever. The emulator image includes copy-paste functionality which is enabled by default on all textboxes, password boxes and edit controls within web browser control, so existing apps get this feature for free. Go ahead and give the new tools a try. If you want to experiment more you might be interested in a unlocked emulator image, follow the link for more information. http://windowsphonehacker.com/latest_windows_phone_7_emulator_unlocked-02-05-11.php

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• High Usage of RAM by wxPython's GUI and need some advice to reduce it

  - by user67024

  I've recently developed a GUI in wxPython for windows platform. It contains a five tabs, 4 of them are just richTextCtrl boxes and the other one has controls for uploading files, buttons, textctrls, a slider etc.. As I was new to GUI development in Python, I used wxFormBuilder to generate some of the code using a good amount of sizers. So, now the problem is that the GUI starts off with a initial memory of around 40MB which is too much for such a simple application (Or so I think) . Also, when the functions handling the functions use huge lists as the program is for debugging large data logs and identifying the problems in'em implying that I can't afford memory for GUI. So, how can I reduce that start working memory size? Is it a general issue in wxPython? And currently trying use profilers but not sure if it's going to help.

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• Showing All Pages in a SharePoint Wiki Library

  - by Damon Armstrong

  Opening a SharePoint wiki takes you to the wiki homepage, which is what most users want and expect.  Administrators, on the other hand, will occasionally need to see a full list of wiki pages in the wiki library.  Getting to this view is really easy, but you have to know where to look. The problem is that when viewing a wiki page SharePoint conveniently removes the Library tab from the ribbon, and the Library tab houses the controls you normally use to switch views.  Many an admin has been frustrated by the fact that they cannot get to this functionality.  A bit more searching, however, reveals that the Page tab in the ribbon contains a button in the Page Library group called View All Pages.  As the name suggests, clicking this button displays a document library style view all the pages in the wiki.  It also makes the Library tab available to switch views and gives administrators access to all of the standard Library tab functionality.

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• What happens at control invoke function?

  - by user65909

  A question about form controls invoke function. Control1 is created on thread1. If you want to update something in Control1 from thread2 you must do something like: delegate void SetTextCallback(string txt); void setText(string txt) { if (this.textBox1.InvokeRequired) { SetTextCallback d = new SetTextCallback(setText); this.Invoke(d, new object[] { txt }); } else { // this will run on thread1 even when called from thread2 this.textBox1.AppendText(msg); } }` What happens behind the scenes here? This invoke behaves different from a normal object invoke. When you want to call a function in an object on a specific thread, then that thread must be waiting on some queue of delegates, and execute the incoming delegates. Is it correct that the windows forms control invoke function is completely different from the standard object invoke function?

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• ASP.NET Conditionally Change ButtonField text at runTime

  - by Rodney Vinyard

  ASP.NET Conditionally Change ButtonField text at runTime   <asp:ButtonField CommandName="Edit" HeaderText="" Text="Edit" ButtonType="Link" />       protected void gvRequests_RowDataBound(object sender, GridViewRowEventArgs e)     {         if (e.Row.RowType == DataControlRowType.DataRow)         {             //----------------------------------------------------             // If status = "Saved", change buttonField.LinkButton.Text to "Copy"             //----------------------------------------------------             if (e.Row.Cells[(int)gCol.Status].Text == "Saved")             {                 //----------------------------------------------------                 // no !                 //----------------------------------------------------                 //string x = e.Row.Cells[(int)gCol.EditLink].Text;                 //e.Row.Cells[(int)gCol.EditLink].Text = "Copy";                   //----------------------------------------------------                 // yes !                 //----------------------------------------------------                 LinkButton linkButton = (LinkButton)e.Row.Cells[(int)gCol.EditLink].Controls[0];                 linkButton.Text = "Copy";             }         }     }

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• Keeping Entitlements in Check

  - by Naresh Persaud

  Thanks for going the webcast on keeping entitlements in check. As a follow up, I have attached the slides to the webcast. The webcast will be available on demand shortly via IOUG.   A few key takeaways: Application security means applying both preventive and detective controls. Audit and security groups need the combination of both access certification and runtime dynamic authorization. Today, security policy is largely fragmented and brittle to change. The result is audit exposure for highly regulated applications.  By addressing the entire value chain of application security with a comprehensive platform approach, organizations can reduce the risk and improve compliance.    Ioug webcast entitlements in check View more PowerPoint from OracleIDM

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• .NET Libraries Cost More Than Windows?

  - by Kevin Mark

  When looking into libraries to make my programming life a little bit easier I've (almost) always been disappointed by the prices offered. For instance, Actipro's WPF Studio is $650. I suppose that's worth it if you plan to make money from the use of those controls. But take a look at, say, Windows. Windows 7 Ultimate is just about $220. I consider Windows to be a far more complex and "worth-it" product/purchase than a library that runs on it. Why the significant difference in pricing? Do libraries really need to be so expensive, or do they need to charge more in order to make a decent some of money?

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• Windows 8.1 Apps Now in Bookstores

  - by Stephen.Walther

  My book Windows 8.1 Apps with HTML5 and JavaScript is in bookstores now and it is available for purchase from Amazon. Extensively updated for the release of Windows 8.1, this book covers all of the new features of the WinJS 2.0 library such as the Repeater, SearchBox, WebView, and NavBar controls and the new WinJS Scheduler. I wrote a new sample app for this edition of the book  – the MyTasks app — that demonstrates how to build a Windows Store app that interacts with Windows Azure Mobile Services. If you are currently using a Windows 8.1 computer then you can install the MyTasks sample app from the Windows Store. I’ve written a summary of the new features included in Windows 8.1 for app developers which you can read here: Top 10 Changes for Building Windows Store Apps with Windows 8.1

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• Interesting interview question. .Net

  - by rahul

  Coding Problem NumTrans There is an integer K. You are allowed to add to K any of its divisors not equal to 1and K. The same operation can be applied to the resulting number and so on. Notice that starting from the number 4, we can reach any composite number by applying several such operations. For example, the number 24 can be reached starting from 4 using 5 operations: 468121824 You will solve a more general problem. Given integers n and m, return the minimal number of the described operations necessary to transform n into m. Return -1 if m can't be obtained from n. Definition Method signature: int GetLeastCount (int n, int m) Constraints N will be between 4 and 100000, inclusive. M will be between N and 100000, inclusive. Examples 1) 4 576 Returns: 14 The shortest order of operations is: 468121827365481108162243324432576 2) 8748 83462 Returns: 10 The shortest order of operations is: 874813122196832624439366590497873283106834488346083462 3) 4 99991 Returns: -1 The number 99991 can't be obtained because it’s prime!

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• Oracle global lock across process

  - by Jimm

  I would like to synchronize access to a particular insert. Hence, if multiple applications execute this "one" insert, the inserts should happen one at a time. The reason behind synchronization is that there should only be ONE instance of this entity. If multiple applications try to insert the same entity,only one should succeed and others should fail. One option considered was to create a composite unique key, that would uniquely identify the entity and rely on unique constraint. For some reasons, the dba department rejected this idea. Other option that came to my mind was to create a stored proc for the insert and if the stored proc can obtain a global lock, then multiple applications invoking the same stored proc, though in their seperate database sessions, it is expected that the stored proc can obtain a global lock and hence serialize the inserts. My question is it possible to for a stored proc in oracle version 10/11, to obtain such a lock and any pointers to documentation would be helpful.

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