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  • How is game development different from other software development?

    - by Davy8
    For a solid general purpose software developer, what specifically is different about game development, either fundamentally or just differences in degree? I've done toy games like Tic-tac-toe, Tetris, and a brute-force sudoku solver (with UI) and I'm now embarking on a mid-sized project (mid-sized for being a single developer and not having done many games) and one thing I've found with this particular project is that separation of concerns is a lot harder since everything affects state, and every object can interact with every other object in a myriad of ways. So far I've managed to keep the code reasonably clean for my satisfaction but I find that keeping clean code in non-trivial games is a lot harder than it is for my day job. The game I'm working on is turn-based and the graphics are going to be fairly simple (web-based, mostly through DOM manipulation) so real time and 3d work aren't really applicable to me, but I'd still be interested in answers regarding those if they're interesting. Mostly interested in general game logic though. P.S. Feel free to retag this, I'm not really sure what tags are applicable.

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  • OWB 11gR2 &ndash; Parallel DML and Query

    - by David Allan
    A quick post illustrating conventional (non direct path) parallel inserts and query using OWB following on from some recent posts from Jean-Pierre and Randolf on this topic. The mapping configuration properties is where you can define these hints in OWB, taking JP’s simplistic illustration, the parallel query hints in OWB are defined on the ‘Extraction hint’ property for the source, and the parallel DML hints are defined on the ‘Loading hint’ property on the target table operator. If we then generate the code you can see the intermediate code generated below… Finally…remember the parallel enabled session for this all to fly… Anyway, hope this helps join a few dots….

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  • Use of Service Bus in a Pub-Sub Engine

    - by JoseK
    In one of our projects, we've built a Publisher - Subscriber Engine on Oracle Service Bus. The functionality being a series of events are published and subscribers (JMS queues) receive these whenever a new event is published. We are facing some technical issues now, performance-wise and hence an architectural review is underway. Now for my questions: Architecturally the ESB has to publish events into a DB and read from the DB which users wish to be notified, then push the event onto their respective queues. There is a high amount of DB interaction and the question is whether ESB should be having such high amount of interaction with the DB in the first place? Or should there have been some alternate component responsible for doing this. Alternately is there any non-DB approach in which we can store the events and subscribers? Where else can this application data be held within the ESB context?

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  • How do engines avoid "Phase Lock" (multiple objects in same location) in a Physics Engine?

    - by C0M37
    Let me explain Phase Lock first: When two objects of non zero mass occupy the same space but have zero energy (no velocity). Do they bump forever with zero velocity resolution vectors or do they just stay locked together until an outside force interacts? In my home brewed engine, I realized that if I loaded a character into a tree and moved them, they would signal a collision and hop back to their original spot. I suppose I could fix this by implementing impulses in the event of a collision instead of just jumping back to the last spot I was in (my implementation kind of sucks). But while I make my engine more robust, I'm just curious on how most other physics engines handle this case. Do objects that start in the same spot with no movement speed just shoot out from each other in a random direction? Or do they sit there until something happens? Which option is generally the best approach?

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  • systems/software engineering design process

    - by adam kim
    I just developed my first non-trivial android app. It was a complete nightmare. I came up with an idea, build the app, changed my idea, and implemented a lot of input from others on new features. All in all my app took 10 times longer than I think that it should have, it is almost impossible to look the source code and tell what's going on with the classes, and may or may not have unused methods that I'll never be able to find... So I would like an opinion from those of you with experience on how to plan out my designs for the future. I created a flow chart (pencil drawn) of a plan: I would like constructive criticism.

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  • Apple Developer Enterprise Program?

    - by Gnial0id
    I'm building an iOS application for a client (not an enterprise but non-profit association with under than 500 employess), distributed in a free version and a "paid" one. The free version will be available with iTunes/AppStore, no problem with that. But about the paid one... the distribution my client wants is different. They want to distribute it to their clients as a bonus in their subscription, and so, to control this distribution. The first answer would be "iOS Developer Enterprise Program", but it's not an enterprise and have less than 500 employees. Will the fact that my client will distribute the app' with a subscription be a problem ? I spend a lot of time to read documentation, but it is not very clear. I'm a bit lost, I admit it. Any help would grateful.

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  • Ubuntu GUI crash when LightDM enters, unable to login

    - by Cesar
    This issue happened spounteniously, i don´t know what could have cause it as i wasn´t using the PC when it happened. I ruled out any messing around with the setting as the user doesn´t know how to enter the BIOS, doesn´t have the sudo password and was only using firefox and libreoffice when it happened. After the plymouth sequence i get this error. https://www.dropbox.com/s/uf1xdkqkw9alvcu/IMAG0252.jpg And this option: https://www.dropbox.com/s/tpivkgjkx2spa3v/IMAG0253.jpg I follow each option and nothing happens after that. The issue persist after rebooting. I choose the other options to see if anything happens, i either get back to option 1 or doesn´t show anything anormal. (I have pictures i someone wants to know) What i found weird is that event though the error is possitioned in the chip, however ubuntu 10.04 and 12.04 run fine in a live CD I saw that some people are having issues when LightDM has a non default wallpaper, but i use a default one. Thanks in advance.

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  • Aktuell: Oracle Enterprise Manager 12c Release 4 ist da

    - by Ralf Durben (DBA Community)
    Ein neues Release für Oracle Enterprise Manager Cloud Control ist verfügbar. Es ist das Release 4, oder genauer die Version 12.1.0.4. Der Download steht für alle unterstützten Plattformen seit dem 03.06.2014 auf OTN zur Verfügung.Natürlich gibt es viele Neuerungen, daher können hier nur wenige aufgezählt werden: - Als Repository Datenbank wird jetzt auch die Datenbankversion 12c (als Non-CDB) unterstützt - Das Sicherheitsmodell für zusammengefasste Zieltypen (z.B. Gruppen) wurde geändert. Jetzt kann man Rechte auf die Member einer Grupper vergeben, ohne dass das gleiche Recht auf die Gruppe selbst vergeben werden müsste - Default Preferred Credentials stellen sicher, dass neue EM Benutzer auch ohne weitere Konfiguration arbeiten können - Der Bereich Cloud Management, also der Betrieb einer eigenen Cloud wurde stark weiterentwickelt. - Im Datenbankbereich können die AWR Daten der einzelnen Zieldatenbanken jetzt in ein zentrales AWR Warehouse übertragen und somit besser für längere Zeit gespeichert werden. Details zum neuen Release werden in Kürze hier in dieser Community besprochen.

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  • How to draw textures on a model

    - by marc wellman
    The following code is a complete XNA 3.1 program almost unaltered to that code skeleton Visual Studio is creating when creating a new project. The only things I have changed are imported a .x model to the content folder of the VS solution. (the model is a simple square with a texture spanning over it - made in Google Sketchup and exported with several .x exporters) in the Load() method I am loading the .x model into the game. The Draw() method uses a BasicEffect to render the model. Except these three things I haven't added any code. Why does the model does not show the texture ? What can I do to make the texture visible ? This is the texture file (a standard SketchUp texture from the palette): And this is what my program looks like - as you can see: No texture! Find below the complete source code of the program AND the complete .x file: namespace WindowsGame1 { /// <summary> /// This is the main type for your game /// </summary> public class Game1 : Microsoft.Xna.Framework.Game { GraphicsDeviceManager graphics; SpriteBatch spriteBatch; public Game1() { graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Content"; } /// <summary> /// Allows the game to perform any initialization it needs to before starting to run. /// This is where it can query for any required services and load any non-graphic /// related content. Calling base.Initialize will enumerate through any components /// and initialize them as well. /// </summary> protected override void Initialize() { // TODO: Add your initialization logic here base.Initialize(); } Model newModel; /// <summary> /// LoadContent will be called once per game and is the place to load /// all of your content. /// </summary> protected override void LoadContent() { // Create a new SpriteBatch, which can be used to draw textures. spriteBatch = new SpriteBatch(GraphicsDevice); // TODO: usse this.Content to load your game content here newModel = Content.Load<Model>(@"aau3d"); foreach (ModelMesh mesh in newModel.Meshes) { foreach (ModelMeshPart meshPart in mesh.MeshParts) { meshPart.Effect = new BasicEffect(this.GraphicsDevice, null); } } } /// <summary> /// UnloadContent will be called once per game and is the place to unload /// all content. /// </summary> protected override void UnloadContent() { // TODO: Unload any non ContentManager content here } /// <summary> /// Allows the game to run logic such as updating the world, /// checking for collisions, gathering input, and playing audio. /// </summary> /// <param name="gameTime">Provides a snapshot of timing values.</param> protected override void Update(GameTime gameTime) { // Allows the game to exit if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) this.Exit(); // TODO: Add your update logic here base.Update(gameTime); } /// <summary> /// This is called when the game should draw itself. /// </summary> /// <param name="gameTime">Provides a snapshot of timing values.</param> protected override void Draw(GameTime gameTime) { if (newModel != null) { GraphicsDevice.Clear(Color.CornflowerBlue); Matrix[] transforms = new Matrix[newModel.Bones.Count]; newModel.CopyAbsoluteBoneTransformsTo(transforms); foreach (ModelMesh mesh in newModel.Meshes) { foreach (BasicEffect effect in mesh.Effects) { effect.EnableDefaultLighting(); effect.TextureEnabled = true; effect.World = transforms[mesh.ParentBone.Index] * Matrix.CreateRotationY(0) * Matrix.CreateTranslation(new Vector3(0, 0, 0)); effect.View = Matrix.CreateLookAt(new Vector3(200, 1000, 200), Vector3.Zero, Vector3.Up); effect.Projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(45.0f), 0.75f, 1.0f, 10000.0f); } mesh.Draw(); } } base.Draw(gameTime); } } } This is the model I am using (.x): xof 0303txt 0032 // SketchUp 6 -> DirectX (c)2008 edecadoudal, supports: faces, normals and textures Material Default_Material{ 1.0;1.0;1.0;1.0;; 3.2; 0.000000;0.000000;0.000000;; 0.000000;0.000000;0.000000;; } Material _Groundcover_RiverRock_4inch_{ 0.568627450980392;0.494117647058824;0.427450980392157;1.0;; 3.2; 0.000000;0.000000;0.000000;; 0.000000;0.000000;0.000000;; TextureFilename { "aau3d.xGroundcover_RiverRock_4inch.jpg"; } } Mesh mesh_0{ 4; -81.6535;0.0000;74.8031;, -0.0000;0.0000;0.0000;, -81.6535;0.0000;0.0000;, -0.0000;0.0000;74.8031;; 2; 3;0,1,2, 3;1,0,3;; MeshMaterialList { 2; 2; 1, 1; { Default_Material } { _Groundcover_RiverRock_4inch_ } } MeshTextureCoords { 4; -2.1168,-3.4022; 1.0000,-0.0000; 1.0000,-3.4022; -2.1168,-0.0000;; } MeshNormals { 4; 0.0000;1.0000;-0.0000; 0.0000;1.0000;-0.0000; 0.0000;1.0000;-0.0000; 0.0000;1.0000;-0.0000;; 2; 3;0,1,2; 3;1,0,3;; } }

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  • Terminal line glitches

    - by foxy
    I installed Ubuntu 11.10 mini + LXDE and wanted to make my command line different in terminal (than just plain white), so I added blue color to path line (everything until $ sign) and it works fine but I have two strange glitches now: When i write a line which is longer than terminal window, instead of starting at next line it starts at the same one, overwriting everything which was in there. Sometimes while navigating over previous commands (up/down arrow keys) some part of command gets stuck and is treated as part of prompt (the blue text), but it is white and is non-deletable and is not taken as part of command when i press enter. What could I mess up? The bad thing is that I don't remember what exactly did I change, but i'm sure I changed only one line in bashrc

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  • Message Buffers in cloud

    - by kaleidoscope
    Message Buffer is WCF queue in the cloud (although currently it does not provide all features of WCF queue). With on-premise WCF, you can take advantage of MSMQ, so that a message is sent to MSMQ by one endpoint, and another endpoint can get the message in a later time. The message is usually a SOAP message so that you can generate a client proxy and invoke the service operations just as invoking a normal WCF operation. Message Buffer is similar, but it also provides a REST API for you to work with the messages. Use it when you need a reliable WCF service. Message buffers can be consumed by non-azure components, "Message  buffers are accessible to applications using HTTP and do not require the Windows Azure platform AppFabric SDK"              How to: Configure an AppFabric Service Bus Message Buffer :    please find below link for more details: http://msdn.microsoft.com/en-us/library/ee794877.aspx http://msdn.microsoft.com/en-us/library/ee794877.aspx   Chandraprakash, S

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  • Are There Realistic/Useful Solutions for Source Control for Ladder Logic Programs

    - by Steven A. Lowe
    Version control for ladder logic (LL) programs for programmable logic controllers (PLCs) seems to be virtually non-existent. It may be because LL is a visual language and tends to be stored in binary files, or it may be because source code control hasn't "caught on" in process control engineering circles - or perhaps my Google-Fu is weak tonight. Do you know of any realistic and useful solutions for version control for such systems? Definitions: realistic = changes to the programs are tracked by user and subject to reversion and merges useful = the system integrates with visual LL designers, is not limited to LL from a single PLC manufacturer, and does not cost a ridiculous amount of money? Note: I have heard of people using SVN or Mercurial et al to track the binary files, but I don't think the diff/merge capabilities would display readable differences.

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  • Why is my fan constatnly blowing in Ubuntu?

    - by Derfder
    I have installed Ubuntu 13.04 (64-bits) alongside Windows 7 on different partition on my second desktop. It's working nice. I have updated everything. However, I have problems with my fan. It's blowing non-stop and very fast(loud). I haven't these problems in Windows 7 where it works nicely. How to update drivers for my fan or something else? My desktop is: HP Pro 3410 Microtower PC. Graphic card: AMD Radeon HD 6570 Board: 2A9C 1.1 Bus Clock: 133 megahertz BIOS: American Megatrends Inc. 6.14 11/05/2010 Processor: 3,20 gigahertz Intel Core i3 550 DRIVERS I HAVE TRIED FOR MY GRAPHIC CARD: I have tried these drivers so far: xserver-xorg-video-ati, version: 1:7.1.0-0ubuntu2 fglrx Version: 2:9.010-0ubuntu3 fglrx-updates Version 2:9.012-0ubuntu1 But the fan is still blowing like a maniac. I have tried to install Linux Mint 15 previously and I have had the same problems with the fan. Any idea how to fix it?

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  • Python or HTML5/JS for game development on 2014 [on hold]

    - by AlexKvazos
    So I've decided to give game development a go. I have experience on php/html/css/sql/js(jquery) so learning a new language shouldn't be as hard. I was reading that python and javascript are both nice for simple 2d non-intensive games. I found that python has this library/engine called PyGame but I realized that it was last updated 4 years ago. People still use this? And for javascript, I found libraries like 'pixi.js', 'melon.js' and 'cocos2d'. My goal is to make 2D games that would require the same performance as terraria, realm of the mad god, castle crashers.. and all those types of games. Taking into consideration, that I do want an updated library, what language of this two would be best to choose and what library to grab for it? Thanks in advance, sorry if question is broad. Let me know and I can edit to add more.

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  • Effects to make a speeding spaceship look faster

    - by Badescu Alexandru
    I have a spaceship and I've created a "boost" functionality that speeds up my spaceship, what effects should I implement to create the impression of high speed? I was thinking of making everything except my spaceship blurry but I think there would be something missing. Any ideas? Btw. I am working in XNA C# but if you aren't familiar to XNA describing some effects is still useful. The Game is 3d and i've attached some printscreens of the game This is in normal mode ( none boosted ) and here is the boosted mode ( the craft speeds up forward while the camera speeds in its normal speed , the non boosted speed )

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  • Flash Player et Acrobat Reader : vulnérabilité critique zero-day confirmée par Adobe, elle serait déjà exploitée

    Flash Player et Acrobat Reader : vulnérabilité critique zero-day confirmée Des pirates l'auraient déjà exploitée Adobe tire la sonnette d'alarme. Une faille critique non corrigée dans son lecteur Flash Player serait déjà exploitée par des pirates. Selon un avis de sécurité qui vient d'être publié par l'éditeur, la vulnérabilité pourrait être exploitée par des pirates distants pour provoquer un crash de l'application ou, plus préoccupant, pour prendre le contrôle du système affecté en intégrant des fichiers Flash infectés dans un document Microsoft Excel envoyé en pièce jointe. La vulnérabilité aurait déjà été utilisée pour des attaques ciblées. La vulnérabilité touche égale...

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  • Specs, Form and Function – What am I Missing?

    - by Barry Shulam
    0 0 1 628 3586 08041 29 8 4206 14.0 Normal 0 false false false EN-US JA X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:Cambria; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin;} Friday October 26th the Microsoft Surface RT arrived at the office.  I was summoned to my boss’s office for the grand unpacking.  If I had planned ahead I could have used my iPhone 4 to film the event and post it on YouTube however the desire to hold the device and turn it ON was more inviting than becoming a proxy reviewer for Engadget’s website.  1980 was the first time we had a personal computer in our house.  It was a  Kaypro computer. It weighed 29 pounds more than any persons lap could hold.  Then the term “portable computer” meant you could remove it from the building and take it else where.  Today I am typing on this entry on a Macbook Air which weighs 2.38 pounds. This morning Amazons front page main title is: “Much More for Much Less” I was born at the right time to start with the CPM operating system on the Kaypro thru the DOS, Windows, Linux, Mac OSX and mobile phone operating systems and languages.  If you are not aware Technology is moving at a rapid pace.  The New iPad (those who are keeping score – iPad4) is replacing a 7 month old machine the New iPad (iPad 3) I have used and owned many technology devices in my life.  The main point that most of the reader who are in the USA overlook is the fact that we are in the USA.  The devices we purchase have a great digital garden to support them.  The Kaypro computer had a 7-inch screen.  It was a TV tube with two colors – Black and Green.  You could see the 80-column screen flicker with characters – have you every played Pac-Man emulated on the screen with the ABC characters. Traveling across the world you will find that not all apps on your device will function as they did back home because they are not offered outside of your country of origin. I think the main question a buyer of technology should be asking is Function.  The greatest Specs with out function limit you.  The most beautiful form with out function is the same as a crystal vase on your shelf – not a good cereal bowl in the morning. Microsoft Surface RT, Amazon Kindle Fire and Apple iPad all great devices in their respective customers hands. My advice for those looking to purchase on this year:  If the device is your only technology device you buy what you WANT and LIKE. Consider this parallel universe if its not your only device?  Ever go shopping for clothing, shoes, and accessories with your wife, girlfriend, sister or mother?  If you listen carefully you will hear the little voices coming out of there heads saying:  “This goes well with that and I can use it also with that outfit” ”Do you think this clashes with that?”  “Ohh I love how that combination looks on you”.  Portable devices such as tablets and computers can offer a whole lot more when they are combined with the digital echo system you have at home and the manufacturer offers online. Pros of each Device: Microsoft Surface RT: There is a new functionality named SmartGlass which will let you share the content off your tablet to your XBOX 360.  Microsoft office is loaded on the tablet.  You can have more than one user profile on the tablet if you share it with others.   Amazon Kindle or Kindle HD: If you are an Amazon consumer with an annual Amazon Prime service you can consume videos and read books off the Amazon site.  Its the cheapest device.  Its a step up from the kindle reader in many ways.   Apple Ipad or Ipad mini: Over 270 Thousand applications.  Airplay permits you the ability to share to your TV screen. If you are a cord cutter (a person who gets their entertainment content over the web or air vs Cable Providers) the Airplay or Smart glass are a huge bonus.  iPad mini or not: The mini will fit in a purse where the larger one will not.  Its lighter which makes it nice to hold for prolonged periods.  It has an option for LTE wireless which non of the other sub 9 inch tables offer.  The screen is non retina which means the applications are smaller.  Speaking with individuals who are above 50 in age that wear glasses they retina does not make a difference for them however they prefer the larger iPad over the new mini.   Happy Shopping this Channuka Season.   The Kosher Coder.   Follow me on twitter @KosherCoder

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  • VSDB to SSDT Series : Introduction

    - by Etienne Giust
    At the office, we extensively use VS2010 SQL Server 2008 Database Projects and SQL Server 2008 Server Projects  in our Visual Studio 2010 solutions. With Visual Studio 2012, those types of projects are replaced by the  SQL Server Database Project  using the SSDT (SQL Server Data Tools) technology. I started investigating the shift from Visual Studio 2010 to Visual Studio 2012 and specifically what needs to be done concerning those database projects in terms of painless migration, continuous integration and standalone deployment. I will write my findings in a series of 4 short articles: Part 1 will be about the database projects migration process and the cleaning up that ensues Part 2 will be about creating SQL Server 2008 Server Projects equivalents with the new SSDT project type Part 3 will introduce a replacement to the vsdbcmd.exe command used for deployment in our continuous integration process Part 4 will explain how to create standalone packages of SSDT projects for deployment on non accessible servers (such as a production server)

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  • netbook alternate installation/update

    - by user11847
    I have an Asipre One D255E netbook. Installed 9.10 sucessfully, but no internet connections to upgrade to 10.04 or 10.10. Have 10.10 alternate (couldnt get 10.04). However it says that no cd-rom present (netbook via live usb), and I directed it to sdb1 but that did not work. Could someone guide me to the steps to installation via alternate ubs only (& no internet)? The live usb's of 10.04 & 10.10 internet connections worked, but installation hanged (non alternate). Thank you greatly in advance.

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  • Stop Screenlets from minimizing

    - by Capt.Nemo
    I've setup my screenlets exactly the way that I want them, but I don't have a quick access to any of them. The screenlet config offers me the following : keep above,below, sticky, locky, widget. Out of these only treat as Widget seems to be of any use here. I just looked at this in detail and thought it was what I was looking for. It might have been a workaround for the issue (instead of minimizing I would just press F9. But this means that the widget hides itself from the normal desktop, which is not what I want. What I want is that on pressing Ctrl+Alt+D or Super+D, I should see the desktop with my screenlets there. I don't want them to minimize with the rest of the windows. As a final struggle, I've thought of a solution using compiz to declare the screenlet windows as non-minimizing, but surely there must be a better way than that. (Instructions for this would be helpful as well - I'm not sure what to enter in the rule matches)

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  • Using Delegates in C# (Part 1)

    - by rajbk
    This post provides a very basic introduction of delegates in C#. Part 2 of this post can be read here. A delegate is a class that is derived from System.Delegate.  It contains a list of one or more methods called an invocation list. When a delegate instance is “invoked” with the arguments as defined in the signature of the delegate, each of the methods in the invocation list gets invoked with the arguments. The code below shows example with static and instance methods respectively: Static Methods 1: using System; 2: using System.Linq; 3: using System.Collections.Generic; 4: 5: public delegate void SayName(string name); 6: 7: public class Program 8: { 9: [STAThread] 10: static void Main(string[] args) 11: { 12: SayName englishDelegate = new SayName(SayNameInEnglish); 13: SayName frenchDelegate = new SayName(SayNameInFrench); 14: SayName combinedDelegate =(SayName)Delegate.Combine(englishDelegate, frenchDelegate); 15: 16: combinedDelegate.Invoke("Tom"); 17: Console.ReadLine(); 18: } 19: 20: static void SayNameInFrench(string name) { 21: Console.WriteLine("J'ai m'appelle " + name); 22: } 23: 24: static void SayNameInEnglish(string name) { 25: Console.WriteLine("My name is " + name); 26: } 27: } We have declared a delegate of type SayName with return type of void and taking an input parameter of name of type string. On line 12, we create a new instance of this delegate which refers to a static method - SayNameInEnglish.  SayNameInEnglish has the same return type and parameter list as the delegate declaration.  Once a delegate is instantiated, the instance will always refer to the same target. Delegates are immutable. On line 13, we create a new instance of the delegate but point to a different static method. As you may recall, a delegate instance encapsulates an invocation list. You create an invocation list by combining delegates using the Delegate.Combine method (there is an easier syntax as you will see later). When two non null delegate instances are combined, their invocation lists get combined to form a new invocation list. This is done in line 14.  On line 16, we invoke the delegate with the Invoke method and pass in the required string parameter. Since the delegate has an invocation list with two entries, each of the method in the invocation list is invoked. If an unhandled exception occurs during the invocation of one of these methods, the exception gets bubbled up to the line where the invocation was made (line 16). If a delegate is null and you try to invoke it, you will get a System.NullReferenceException. We see the following output when the method is run: My name is TomJ'ai m'apelle Tom Instance Methods The code below outputs the same results as before. The only difference here is we are creating delegates that point to a target object (an instance of Translator) and instance methods which have the same signature as the delegate type. The target object can never be null. We also use the short cut syntax += to combine the delegates instead of Delegate.Combine. 1: public delegate void SayName(string name); 2: 3: public class Program 4: { 5: [STAThread] 6: static void Main(string[] args) 7: { 8: Translator translator = new Translator(); 9: SayName combinedDelegate = new SayName(translator.SayNameInEnglish); 10: combinedDelegate += new SayName(translator.SayNameInFrench); 11:  12: combinedDelegate.Invoke("Tom"); 13: Console.ReadLine(); 14: } 15: } 16: 17: public class Translator { 18: public void SayNameInFrench(string name) { 19: Console.WriteLine("J'ai m'appelle " + name); 20: } 21: 22: public void SayNameInEnglish(string name) { 23: Console.WriteLine("My name is " + name); 24: } 25: } A delegate can be removed from a combination of delegates by using the –= operator. Removing a delegate from an empty list or removing a delegate that does not exist in a non empty list will not result in an exception. Delegates are invoked synchronously using the Invoke method. We can also invoke them asynchronously using the BeginInvoke and EndInvoke methods which are compiler generated.

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  • KDE Sometimes Glitches On Wakeup

    - by Mew
    Well, a picture is work 1k words: Looks bad, huh? I am using the 331-updates latest 331.67 drivers from NVidia's website on a Dell Latitude e6400. Everything else is up-to-date. This only happens when I resume from sleep, or I switch to a VT and back. It also doesn't ALWAYS happen, which I find odd. Graphics Card: Nvidia Quadro NVS160M UPDATE AFTER TESTING: This problem only exists with KDE (specifically QT). I can go into Unity or Mint or any non QT-based GUI and it works perfectly with no resume errors. UPDATE: This only happens when I use KWin (and KDE). I have upgraded to 14.04 and the problem is not occurring as frequently. Also, sometimes this effect doesn't happen, but instead the top menu bar simply goes out of focus with the rest of the screen goes blank.

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  • Oracle Applications Day 2012. Experience the Global Innovation of Management Applications

    - by antonella.buonagurio
    Iscriviti subito all’Oracle Applications Day 2012 e partecipa al concorso fotografico Oracle I.M.A.G.E. Pochi i giorni rimasti per partecipare al CONCORSO, molte le possibilità di vincere il tuo iPad (*)! Hai tempo fino al 5 OTTOBRE per inviare le tue fotografie Oracle I.M.A.G.E. e vincere uno dei 5 iPad(*) in palio per ciascuna delle due città! Non perdere quest’occasione, scatta le immagini che per te descrivono i cinque concept dell’evento e inviale per e-mail a [email protected] indicando: •  nell’oggetto della mail, il tema della fotografia: Innovation, Management, Applications, Global, Experience; •  nel corpo della mail, il tuo nome e cognome e città nella quale parteciperai all’Applications Day 2012 Milano o Roma. 10 ottobre 2012 – Milano, East End Studios | 17 ottobre 2012 - Roma, Officine Farneto L’evento per condividere con Clienti e Partner Oracle le soluzioni più innovative e le esperienze più significative sulle scelte strategiche per affrontare le sfide attuali e future. Iscriviti all’evento sul sito

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  • Should I provide fallbacks for HTML5/CSS3 elements in a web page at this point?

    - by Abluescarab
    I'm wondering if I should bother providing a fallback for HTML5 tags and attributes and CSS3 styling at this point in time. I know that there's probably still a lot of people out there who use older versions of browsers and HTML5/CSS3 are still fairly new. I read this article: Should I use non-standard tags in a HTML page for highlighting words? and one answer mentioned that people kind of "cheat" with older browsers by using the new tags and attributes, but styling them in CSS to ensure they show up right. This question: Relevance of HTML5: Is now the time? was asked about two years ago and I don't know how relevant it is anymore. For example, I want to use the placeholder and required attributes in a web form I'm building and it has no labels to show what each <input> is. How do I handle this, or do I bother?

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  • Can't access Windos 7 OS in Ubuntu

    - by Myers
    When I try and Access my Windows 7 OS I get the following memo and I have no idea what to make of the code. Error mounting /dev/sda2 at /media/name/Windows7_OS: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sda2" "/media/name/Windows7_OS"' exited with non-zero exit status 13: ntfs_attr_pread_i: ntfs_pread failed: Input/output error Failed to read NTFS $Bitmap: Input/output error NTFS is either inconsistent, or there is a hardware fault, or it's a SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows then reboot into Windows twice. The usage of the /f parameter is very important! If the device is a SoftRAID/FakeRAID then first activate it and mount a different device under the /dev/mapper/ directory, (e.g. /dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation for more details. What should I do ?

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