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Articles indexed in April 2010

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  • UPS and power strip interactions?

    - by chaos
    Sometimes I hear that you shouldn't plug (UPS brand X / any UPS) into (power strip brand X / any power strip) because of some interaction leading to poorly conditioned power, reduced battery life, massive explosions spattering the room with battery acid, and so on. Sometimes I hear that it's the power strip that you shouldn't plug into the UPS. What I haven't gotten is a clear idea of how reliable these recommendations are or how generally/specifically they apply. Can anyone speak precisely and non-urban-legendfully on these UPS and power strip interactions, if there are in fact ones worth thinking about?

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  • Grepping grep output fails

    - by viraptor
    I'm trying to grep the output of ngrep. Unfortunately when I add another grep to the pipeline, I get no output at all. It can be some other command too - cat / grep / tee - everything breaks the chain. Example: # this works: $ ngrep -l -q -T -Wbyline -d any udp and port 5060 | egrep -B1 '^SIP/2.0 180' -- U +1.469535 xxx:5060 -> xxx:5060 SIP/2.0 180 Ringing. -- U +0.001384 xxx:5060 -> xxx:2048 SIP/2.0 180 Ringing. but #these don't: $ ngrep -l -q -T -Wbyline -d any udp and port 5060 | egrep -B1 '^SIP/2.0 180' | egrep '^U' $ ngrep -l -q -T -Wbyline -d any udp and port 5060 | egrep -B1 '^SIP/2.0 180' | cat $ ngrep -l -q -T -Wbyline -d any udp and port 5060 | egrep -B1 '^SIP/2.0 180' | tee test If I use cat somefile instead of ngrep at the start, everything works as expected. Any ideas what could go wrong here?

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  • Spring Security RememberMe Services with Session Cookie

    - by Jarrod
    I am using Spring Security's RememberMe Services to keep a user authenticated. I would like to find a simple way to have the RememberMe cookie set as a session cookie rather than with a fixed expiration time. For my application, the cookie should persist until the user closes the browser. Any suggestions on how to best implement this? Any concerns on this being a potential security problem? The primary reason for doing so is that with a cookie-based token, any of the servers behind our load balancer can service a protected request without relying on the user's Authentication to be stored in an HttpSession. In fact, I have explicitly told Spring Security to never create sessions using the namespace. Further, we are using Amazon's Elastic Load Balancing, and so sticky sessions are not supported. NB: Although I am aware that as of Apr. 08, Amazon now supports sticky sessions, I still do not want to use them for a handful of other reasons. Namely that the untimely demise of one server would still cause the loss of sessions for all users associated with it. http://aws.amazon.com/about-aws/whats-new/2010/04/08/support-for-session-stickiness-in-elastic-load-balancing/

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  • Clearing "may not respond" warnings for UIView and UIViewController

    - by user284681
    In an iPad app, I'm using a custom subclass of UIView with UIViewController. Here's the view header: @interface pdfView : UIView { CGPDFDocumentRef doc; } -(void)setDoc:(CGPDFDocumentRef)newDoc; @end And here's the controller header: @interface iPadPDFTestViewController : UIViewController { CGPDFDocumentRef doc; } - (void)loadPDF; @end Part of the controller implementation: - (void)viewDidLoad { [super viewDidLoad]; [self loadPDF]; [self.view setDoc:doc]; } In Interface Builder, I've set the view object to use the class pdfView. At compilation, [self.view setDoc:doc]; gives the warning "'UIView' may not respond to '--setDoc'." I'm guessing that this warning appears because the compiler thinks it's looking at UIView (which does not implement the setDoc method) instead of pdfView. But why does it think that? And how can I tell it what class it's really looking at, so as to clear the warning?

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  • SQL Server 2008 Problem with SCOPE_IDENTITY()

    - by jinsungy
    My code does not update the thread field. It is null. Anyone have any ideas? INSERT INTO [Messages]([Sender], [Receiver], [Job_Number], [Subject], [MessageText], [DateSent]) VALUES(@Sender, @Receiver, @Job_Number, @Subject, @MessageText, @DateSent) SET @ThreadID = SCOPE_IDENTITY() UPDATE [Messages] SET Thread = @ThreadID WHERE MessageID = @ThreadID

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  • ajax call returns null in my facebook iframe !!!

    - by uhsp
    Hi, I am using jquery to send an ajax request from my facebook app which is in iframe to my server. The ajax request works fine when the web app is running stand alone and out of facebook platform, but within facebook, the result that I get from my ajax request is blank !!! Here is the code I use: $.ajax({ url: 'http://mydomain.com/search', data: params, cache: false, dataType: 'json', success: function(posts) { // post is null !!!!! } error: function(json) { alert('error'); } }); I appreciate if anybody can help me with it. Thanks. uhsp

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  • Squid handling of concurrent cache misses

    - by Oliver H-H
    We're using a Squid cache to off-load traffic from our web servers, ie. it's setup as a reverse-proxy responding to inbound requests before they hit our web servers. When we get blitzed with concurrent requests for the same request that's not in the cache, Squid proxies all the requests through to our web ("origin") servers. For us, this behavior isn't ideal: our origin servers gets bogged down trying to fulfill N identical requests concurrently. Instead, we'd like the first request to proxy through to the origin server, the rest of the requests to queue at the Squid layer, and then all be fulfilled by Squid when the origin server has responded to that first request. Does anyone know how to configure Squid to do this? We've read through the documentation multiple times and thoroughly web-searched the topic, but can't figure out how to do it. We use Akamai too and, interestingly, this is its default behavior. (However, Akamai has so many nodes that we still see lots of concurrent requests in certain traffic spike scenarios, even with Akamai's super-node feature enabled.) This behavior is clearly configurable for some other caches, eg. the Ehcache documentation offers the option "Concurrent Cache Misses: A cache miss will cause the filter chain, upstream of the caching filter to be processed. To avoid threads requesting the same key to do useless duplicate work, these threads block behind the first thread." Some folks call this behavior a "blocking cache," since the subsequent concurrent requests block behind the first request until it's fulfilled or timed-out. Thx for looking over my noob question! Oliver

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  • Error deploying web application on Weblogic 10.3 using maven 2: "Can't find wsdl /wsdls/wsat.wsdl"

    - by Marcos Carceles
    Hi, I'm using maven for deploying a web application in my Weblogic 10.3 server remotely. I created my pom file based on the indication on this previous question: Using maven as build tool for Weblogic 10.3 My pom.xml file is: <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.balfourbeatty.horizon.maven.test</groupId> <artifactId>maven-test-webapp</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>maven-test-webapp Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <weblogic.version>10.3</weblogic.version> </properties> <build> <plugins> <plugin> <groupId>org.apache.myfaces.trinidadbuild</groupId> <artifactId>maven-jdev-plugin</artifactId> </plugin> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>weblogic-maven-plugin</artifactId> <version>2.9.1</version> <configuration> <name>maven-test-webapp</name> <adminServerHostName>******************</adminServerHostName> <adminServerPort>****</adminServerPort> <adminServerProtocol>t3</adminServerProtocol> <userId>******</userId> <password>*****</password> <upload>true</upload> <remote>true</remote> <verbose>true</verbose> <debug>true</debug> <targetNames>WLS_Spaces</targetNames> <noExit>true</noExit> <projectPackaging>war</projectPackaging> </configuration> <dependencies> <dependency> <groupId>com.sun</groupId> <artifactId>tools</artifactId> <version>1.6</version> <scope>system</scope> <systemPath>${java.home}/../lib/tools.jar</systemPath> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>weblogic</artifactId> <version>${weblogic.version}</version> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>webservices</artifactId> <version>${weblogic.version}</version> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.utils.full</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.i18n</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.weblogic.rmi.client</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>javax.enterprise.deploy</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>webserviceclient</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.weblogic.security.wls</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.weblogic.security.identity</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.weblogic.security</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>wlclient</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.transaction</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.utils.classloaders</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>wljmsclient</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.management.core</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>wls-api</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.descriptor</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.logging</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.weblogic.socket.api</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.weblogic.security.digest</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.weblogic.workmanager</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.weblogic.lifecycle</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.utils.wrapper</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>wlsafclient</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.management.jmx</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>com.bea.core.descriptor.wl</artifactId> <version>${weblogic.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>weblogic</groupId> <artifactId>javax.mail</artifactId> <version>10.3</version> </dependency> </dependencies> </plugin> </plugins> <finalName>maven-test-webapp</finalName> </build> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>org.codehaus.mojo</groupId> <artifactId>weblogic-maven-plugin</artifactId> <version>2.9.1</version> </dependency> </dependencies> <distributionManagement> <!-- use the following if you're not using a snapshot version. --> <repository> <id>internal</id> <name>Archiva Managed Internal Repository</name> <url>http://localhost:8180/archiva/repository/internal</url> </repository> <!-- use the following if you ARE using a snapshot version. --> <snapshotRepository> <id>snapshots</id> <name>Archiva Managed Snapshot Repository</name> <url>http://localhost:8180/archiva/repository/snapshots</url> </snapshotRepository> </distributionManagement> </project> All the dependencies are already resolved properly, as they are in the local archiva repository. The application does not contain any web-service, being just a "hello world" application. /index.jsp /WEB-INF/web.xml The error I get is: [BasicOperation.execute():423] : Initiating deploy operation for app, maven-test-webapp, on targets: [BasicOperation.execute():425] : WLS_Spaces Task 14 initiated: [Deployer:149026]deploy application maven-test-webapp on WLS_Spaces. dumping Exception stack Task 14 failed: [Deployer:149026]deploy application maven-test-webapp on WLS_Spaces. Target state: deploy failed on Server WLS_Spaces weblogic.wsee.ws.WsException: When processing WebService module 'maven-test-webapp.war'. Can't find wsdl /wsdls/wsat.wsdl at weblogic.wsee.deploy.WSEEWebModule.loadWsdlDefinitions(WSEEWebModule.java:159) at weblogic.wsee.deploy.WSEEModule.loadWsdl(WSEEModule.java:334) at weblogic.wsee.deploy.WSEEAnnotationProcessor.isWsdlHasPolicy(WSEEAnnotationProcessor.java:312) at weblogic.wsee.deploy.WSEEAnnotationProcessor.process(WSEEAnnotationProcessor.java:91) at weblogic.wsee.deploy.WSEEAnnotationProcessor.process(WSEEAnnotationProcessor.java:51) at weblogic.wsee.deploy.WSEEModule.prepare(WSEEModule.java:102) at weblogic.wsee.deploy.ServletDeployListener.contextPrepared(ServletDeployListener.java:26) at weblogic.servlet.internal.EventsManager$FireContextPreparedAction.run(EventsManager.java:503) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121) at weblogic.servlet.internal.EventsManager.notifyContextPreparedEvent(EventsManager.java:162) at weblogic.servlet.internal.WebAppServletContext.initContextListeners(WebAppServletContext.java:1782) at weblogic.servlet.internal.WebAppServletContext.prepare(WebAppServletContext.java:1136) at weblogic.servlet.internal.HttpServer.doPostContextInit(HttpServer.java:449) at weblogic.servlet.internal.HttpServer.loadWebApp(HttpServer.java:424) at weblogic.servlet.internal.WebAppModule.registerWebApp(WebAppModule.java:924) at weblogic.servlet.internal.WebAppModule.prepare(WebAppModule.java:356) at weblogic.application.internal.flow.ScopedModuleDriver.prepare(ScopedModuleDriver.java:176) at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:199) at weblogic.application.internal.flow.DeploymentCallbackFlow$1.next(DeploymentCallbackFlow.java:391) at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:83) at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:59) at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:43) at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.java:1221) at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:83) at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:367) at weblogic.application.internal.SingleModuleDeployment.prepare(SingleModuleDeployment.java:39) at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:154) at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:60) at weblogic.deploy.internal.targetserver.operations.ActivateOperation.createAndPrepareContainer(ActivateOperation.java:207) at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doPrepare(ActivateOperation.java:98) at weblogic.deploy.internal.targetserver.operations.AbstractOperation.prepare(AbstractOperation.java:217) at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentPrepare(DeploymentManager.java:747) at weblogic.deploy.internal.targetserver.DeploymentManager.prepareDeploymentList(DeploymentManager.java:1216) at weblogic.deploy.internal.targetserver.DeploymentManager.handlePrepare(DeploymentManager.java:250) at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.prepare(DeploymentServiceDispatcher.java:159) at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doPrepareCallback(DeploymentReceiverCallbackDeliverer.java:157) at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$000(DeploymentReceiverCallbackDeliverer.java:12) at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$1.run(DeploymentReceiverCallbackDeliverer.java:45) at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:516) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201) at weblogic.work.ExecuteThread.run(ExecuteThread.java:173) Does anyone have any idea on what could the problem be? Many thanks!

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  • Ball to Ball Collision - Detection and Handling

    - by Simucal
    With the help of the Stack Overflow community I've written a pretty basic-but fun physics simulator. You click and drag the mouse to launch a ball. It will bounce around and eventually stop on the "floor". My next big feature I want to add in is ball to ball collision. The ball's movement is broken up into a x and y speed vector. I have gravity (small reduction of the y vector each step), I have friction (small reduction of both vectors each collision with a wall). The balls honestly move around in a surprisingly realistic way. I guess my question has two parts: What is the best method to detect ball to ball collision? Do I just have an O(n^2) loop that iterates over each ball and checks every other ball to see if it's radius overlaps? What equations do I use to handle the ball to ball collisions? Physics 101 How does it effect the two balls speed x/y vectors? What is the resulting direction the two balls head off in? How do I apply this to each ball? Handling the collision detection of the "walls" and the resulting vector changes were easy but I see more complications with ball-ball collisions. With walls I simply had to take the negative of the appropriate x or y vector and off it would go in the correct direction. With balls I don't think it is that way. Some quick clarifications: for simplicity I'm ok with a perfectly elastic collision for now, also all my balls have the same mass right now, but I might change that in the future. In case anyone is interested in playing with the simulator I have made so far, I've uploaded the source here (EDIT: Check the updated source below). Edit: Resources I have found useful 2d Ball physics with vectors: 2-Dimensional Collisions Without Trigonometry.pdf 2d Ball collision detection example: Adding Collision Detection Success! I have the ball collision detection and response working great! Relevant code: Collision Detection: for (int i = 0; i < ballCount; i++) { for (int j = i + 1; j < ballCount; j++) { if (balls[i].colliding(balls[j])) { balls[i].resolveCollision(balls[j]); } } } This will check for collisions between every ball but skip redundant checks (if you have to check if ball 1 collides with ball 2 then you don't need to check if ball 2 collides with ball 1. Also, it skips checking for collisions with itself). Then, in my ball class I have my colliding() and resolveCollision() methods: public boolean colliding(Ball ball) { float xd = position.getX() - ball.position.getX(); float yd = position.getY() - ball.position.getY(); float sumRadius = getRadius() + ball.getRadius(); float sqrRadius = sumRadius * sumRadius; float distSqr = (xd * xd) + (yd * yd); if (distSqr <= sqrRadius) { return true; } return false; } public void resolveCollision(Ball ball) { // get the mtd Vector2d delta = (position.subtract(ball.position)); float d = delta.getLength(); // minimum translation distance to push balls apart after intersecting Vector2d mtd = delta.multiply(((getRadius() + ball.getRadius())-d)/d); // resolve intersection -- // inverse mass quantities float im1 = 1 / getMass(); float im2 = 1 / ball.getMass(); // push-pull them apart based off their mass position = position.add(mtd.multiply(im1 / (im1 + im2))); ball.position = ball.position.subtract(mtd.multiply(im2 / (im1 + im2))); // impact speed Vector2d v = (this.velocity.subtract(ball.velocity)); float vn = v.dot(mtd.normalize()); // sphere intersecting but moving away from each other already if (vn > 0.0f) return; // collision impulse float i = (-(1.0f + Constants.restitution) * vn) / (im1 + im2); Vector2d impulse = mtd.multiply(i); // change in momentum this.velocity = this.velocity.add(impulse.multiply(im1)); ball.velocity = ball.velocity.subtract(impulse.multiply(im2)); } Source Code: Complete source for ball to ball collider. Binary: Compiled binary in case you just want to try bouncing some balls around. If anyone has some suggestions for how to improve this basic physics simulator let me know! One thing I have yet to add is angular momentum so the balls will roll more realistically. Any other suggestions? Leave a comment!

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  • How to specify HTTP expiration header? (ASP.NET MVC+IIS)

    - by Marek
    I am already using output caching in my ASP.NET MVC application. Page speed tells me to specify HTTP cache expiration for css and images in the response header. I know that the Response object contains some properties that control cache expiration. I know that these properties can be used to control HTTP caching for response that I am serving from my code: Response.Expires Response.ExpiresAbsolute Response.CacheControl or alternatively Response.AddHeader("Expires", "Thu, 01 Dec 1994 16:00:00 GMT"); The question is how do I set the Expires header for resources that are served automatically, e.g. images, css and such?

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  • Keyboard with normal layout just without numpad? [closed]

    - by Pla
    Do you know any keyboard that does not have a numpad and, at the same time, is not a compact keyboard? I type a lot and I enjoy using standard full sized keyboards. I am annoyed by the presence of the numpad. I've never used it; it just wastes desktop space! All I could find are (even more annoying) compact keyboards. Sadly those keyboards are so compact that cram the arrow keys and the page up/down keys in a very little space. So, does anyone know a keyboard with a normal layout but without the numpad?

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  • Powder Physics Games

    - by frinkz
    Does anyone have any experience with this sort of thing? I'm talking about applets like this http://dan-ball.jp/en/javagame/dust/ I'm really interested in how they work, it seems more like fluid-dynamics than regular game physics. Does anyone know any open source variations, or any hints on how they might work? I think it would be really fun and challenging to work on something like this, but I'm not sure where to start researching... Thanks :)

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  • What is the difference between type and type.__new__ in python?

    - by Jason Baker
    I was writing a metaclass and accidentally did it like this: class MetaCls(type): def __new__(cls, name, bases, dict): return type(name, bases, dict) ...instead of like this: class MetaCls(type): def __new__(cls, name, bases, dict): return type.__new__(cls, name, bases, dict) What exactly is the difference between these two metaclasses? And more specifically, what caused the first one to not work properly (some classes weren't called into by the metaclass)?

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  • Unable to Turn On Media Streaming in Windows Media Player 12 on Windows 7

    - by Chau Chee Yang
    I have 2 PC installed with Windows 7 and Media Player 12. I would like to use Play To feature on both PC connected via LAN. Both PC (A and B) run media player in standard user account. I able to turn on media streaming option in PC A (with privilege access prompt) without any problem. However, PC B also prompt privilege access but no response after enter administrator password. Both PC follow same configuration steps. I may use "play to" PC A (in standard user account) from other PC without any problem. But I can't "play to" PC B in standard user account. I can only run media player in administrator account for "play to" to function. I have tried uninstall and reinstall media player via "Programs and Features" in control panel on PC B. However, it doesn't work too. Does anyone has similar experience as me failing to turn on media streaming that running Windows media player in standard user account?

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  • Algorithms for City Simulation?

    - by anon
    I want to create a city filled with virtual creatures. Say like Sim City, where each creature walks around, doing it's own tasks. I'd prefer the city to not 'explode' or do weird things -- like the population dies off, or the population leaves, or any other unexpected crap. Is there a set of basic rules I can encode each agent with so that the city will be 'stable'? (Much like how for physics simulations, we have some basic rules that govern everything; is there a set of rules that governs how a simulation of a virtual city will be stable?) I'm new to this area and have no idea what algorithms/books to look into. Insights deeply appreciated. Thanks!

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  • C# graphics flickering

    - by David
    Hello, I am working on kind of drawing program but I have a problem with flickering while moving a mouse cursor while drawing a rubberband line. I hope you can help me to remove that flickering of line, here is the code: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace GraphicsTest { public partial class Form1 : Form { int xFirst, yFirst; Bitmap bm = new Bitmap(1000, 1000); Graphics bmG; Graphics xG; Pen pen = new Pen(Color.Black, 1); bool draw = false; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { bmG = Graphics.FromImage(bm); xG = this.CreateGraphics(); bmG.Clear(Color.White); } private void Form1_MouseDown(object sender, MouseEventArgs e) { xFirst = e.X; yFirst = e.Y; draw = true; } private void Form1_MouseUp(object sender, MouseEventArgs e) { bmG.DrawLine(pen, xFirst, yFirst, e.X, e.Y); draw = false; xG.DrawImage(bm, 0, 0); } private void Form1_MouseMove(object sender, MouseEventArgs e) { if (draw) { xG.DrawImage(bm, 0, 0); xG.DrawLine(pen, xFirst, yFirst, e.X, e.Y); } } private void Form1_Paint(object sender, PaintEventArgs e) { xG.DrawImage(bm, 0, 0); } } }

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  • Plain-English tutorial on artificial neural networks?

    - by Stuart
    I've Googled, StackOverflowed, everything, and I cannot seem to find a tutorial I can understand. I understand the concept of genetic algorithms, and how to implement them, (Though I haven't tried) but I cannot grasp the concept of neural networks. I know vaguely how they work... And that's about it. Could someone direct me to a tutorial that could help someone who has not even graduated middle school yet? Sure, I'm several years ahead of the majority of people my grade, but I don't understand summation, (which I apparently need if I don't want a simple binary output) vectors, and other things that I apparently should know. Is there a simple, bare-bones tutorial for neural networks? After I learn the basics, I'll proceed to more difficult ones. Preferably, they would be in Java. Thanks!

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  • .NETCF Component that allows entering a signature

    - by Vaccano
    I need a component that will allow me to enter a signature on a Windows Mobile 5 device. I need to integrate it into my .NETCF program. I would prefer it be free (getting budget approval takes so long). (I have seen the "for pay" one by Resco.) I would need to end up storing the signature in a SQL Server database (it has to be able to serialize). If anyone has any suggestions I would love to hear them.

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