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  • ssh: which side is running the SOCKS proxy?

    - by Barry Brown
    When I set up a tunnel using dynamic forwarding (ssh -D), which side is running the SOCKS proxy? That is, is the proxy running on the local end (client) or the remote end (server)? Here's the situation: I want to set up several tunnels chained together using -L. Should the -D tunnel be the last one in the chain or the first one? Edit: I found the answer to the second paragraph on Super User (the -D tunnel should be at the remotest end). But I'd still like to know where the proxy code is running.

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  • Are these three brand new sticks of RAM really dead?

    - by David Brown
    I'm working on a Dell Dimension 4700 desktop for a friend. It came with 512MB of DDR2 RAM (two sticks of 256MB). One morning, it started blue screening on startup with no helpful error messages. It refused to boot into any form of Windows installation, including Safe Mode, original recovery disk, and my custom Windows PE disk. It did boot into the Ultimate Boot CD, so I ran memtest86, which reported errors everywhere. I removed one stick of RAM and the system booted up just fine. I moved the remaining stick into each slot and the system continued to operate normally, so I came to the conclusion that the stick that I removed was dead. I ordered an exact replacement, along with 2 more sticks of 256MB DDR2 (again, exactly the same as the original), bringing the total system memory to 1GB. Upon installing the three brand new sticks, the system blue screened again, this time stating that win32k.sys attempted to write to read-only memory. I inserted my custom Windows PE disk in order to get a better look at the memory dump with BlueScreenView, but it refused to boot and produced another blue screen, but without an error message. I removed each new stick one-by-one, restarting each time. It continued to blue screen until I was left with only the original stick. I then tried inserting the new sticks in various different orders, but this only produced more blue screens. I reinserted all three sticks (along with the original) and ran memtest86 again, which reported errors all over the place. So, now I'm right back where I started. I don't think it could be the slots themselves, because I can plug the original stick into any slot and it works just fine. System setup reports each stick correctly and shows the total as 1GB, however. It just seems strange to me that all three brand new sticks of RAM could be dead on arrival. Is there something I missed? Or should I just go ahead and RMA them?

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  • Experience with MooseFS?

    - by brown.2179
    Anyone have any experience using MooseFS? I want an easy distributed storage platform to store static data archive of about 10 TB and serve it to 20-40 nodes. Also I want to be able to add storage as the archive grows without having to rebuild the filesystem. I don't care if it's a bit slow. I just want it to be simple and stable. Basically from what I can see for OS X it's between MooseFS and Gluster. Any other suggestions?

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  • Iptables - forward email ports?

    - by Emmet Brown
    im trying to open some local ports (LAN) and then re-direct them to another server (WAN) using iptables. Here is my config: #WAN allow-hotplug eth1 auto eth1 iface eth1 inet static #Tarjeta red WAN address 192.168.2.2 gateway 192.168.2.1 netmask 255.255.255.0 #LAN allow-hotplug eth0 auto eth0 iface eth0 inet static address 192.168.16.6 netmask 255.255.255.0 network 192.168.16.0 broadcast 192.168.16.255 I try this: iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 110 -j DNAT --to 200.40.30.218:110 iptables -A FORWARD -p tcp -i eth0 -o eth1 -d 200.40.30.218 --dport 110 -j ACCEPT iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 25 -j DNAT --to 200.40.30.218:25 iptables -A FORWARD -p tcp -i eth0 -o ethq -d 200.40.30.218 --dport 25 -j ACCEPT but, it did not work. i also try changeing eth0 to eth1 (and eth1 to eth0) but nothing happened. Starting Nmap 5.00 ( http://nmap.org ) at 2011-10-03 14:44 UYST Interesting ports on 192.168.16.6: Not shown: 997 closed ports PORT STATE SERVICE 22/tcp open ssh 111/tcp open rpcbind 8080/tcp open http-proxy Im running debian. Can u guys help me to check what is happening? edit: IPTABLES-SAVE # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *mangle :PREROUTING ACCEPT [139993:77867651] :INPUT ACCEPT [139385:77761761] :FORWARD ACCEPT [186:12071] :OUTPUT ACCEPT [173556:74341650] :POSTROUTING ACCEPT [173734:74352988] COMMIT # Completed on Mon Oct 3 15:43:14 2011 # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *nat :PREROUTING ACCEPT [1649:190626] :POSTROUTING ACCEPT [6729:339646] :OUTPUT ACCEPT [6697:337660] -A PREROUTING -i eth0 -p tcp -m tcp --dport 110 -j DNAT --to-destination 200.40.30.218:110 -A PREROUTING -i eth0 -p tcp -m tcp --dport 25 -j DNAT --to-destination 200.40.30.218:25 COMMIT # Completed on Mon Oct 3 15:43:14 2011 # Generated by iptables-save v1.4.8 on Mon Oct 3 15:43:14 2011 *filter :INPUT ACCEPT [138307:77066136] :FORWARD ACCEPT [168:11207] :OUTPUT ACCEPT [172288:73655708] -A FORWARD -d 200.40.30.218/32 -i eth0 -o eth1 -p tcp -m tcp --dport 110 -j ACCEPT -A FORWARD -d 200.40.30.218/32 -i eth0 -o ethq -p tcp -m tcp --dport 25 -j ACCEPT COMMIT # Completed on Mon Oct 3 15:43:14 2011 Regards

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  • Desktop Fun: 21 Cool Ubuntu Wallpapers

    - by Vivek
    Ubuntu 10.04 was released last month, and comes with some breath taking design enhancements, and has some fabulous art work integrated into it. We’ve put together a collection of wallpapers to make it more customized. We thought of pulling out some of the best Ubuntu wallpapers in this post so that you have a good mix to choose from when you are slightly bored of the default Lucid Lynx (Ubuntu 10.04) wallpaper. The following is a collection of top 21 Ubuntu wallpapers. To download the wallpaper just click on the hyperlink above the image. Ubuntu Wallpapers EgFox Lucid Lynx Blue 2010 by ~Eg-Art EgFox Lucid Lynx K HD 2010 by ~Eg-Art Lucid Lynx 10 04 by ~Momez Ubokeh Wallpaper Pack by ~giantspeck lucid fog brown by ~darkburt EgFox Lucid Lynx HD 2010 by ~Eg-Art LTS 2010 by ~alkore31 Ubuntu Bokeh by ~ttk1opc Ubuntu Aurora by *monkeymagico Ubuntu by ~gorkisview Ubuntu Glow by ~BigAction Destroy Ubuntu by ~lukeroberts Ubuntu Triskell by ~deviantdark Ubuntu 2.0 by ~monsteer Ubuntu leaves by ~sizakor Ubuntu Bokeh by ~freyr Ubuntu Brown leather distress by *monkeymagico Ubuntu Black Metal Hex by *monkeymagico Ubuntu gusty 4 walls by ~yf19-sama Ubuntu Wallpaper by ~Ruzzy2006 ubuntu-Gloss by ~SWOriginal Enjoy the new wallpaper to suit your desktop. You also might want to make sure and check out our Desktop Fun section for more collections of cool wallpapers. Similar Articles Productive Geek Tips Windows 7 Welcome Screen Taking Forever? Here’s the Fix (Maybe)Allow Remote Control To Your Desktop On UbuntuCheck your Disk Usage on Ubuntu from the command lineDual Monitors: Use a Different Wallpaper on Each Desktop in Windows 7, Vista or XPDesktop Fun: Starship Theme Wallpapers TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips VMware Workstation 7 Acronis Online Backup DVDFab 6 Revo Uninstaller Pro Enhance Your Laptop’s Battery Life With These Tips Easily Search Food Recipes With Recipe Chimp Tech Fanboys Field Guide Check these Awesome Chrome Add-ons iFixit Offers Gadget Repair Manuals Online Vista style sidebar for Windows 7

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  • Silverlight Cream for April 24, 2010 -- #846

    - by Dave Campbell
    In this Issue: Michael Washington, Timmy Kokke, Pete Brown, Paul Yanez, Emil Stoychev, Jeremy Likness, and Pavan Podila. Shoutouts: If you've got some time to spend, the User Experience Kit is packed with info: User Experience Kit, and just plain fun to navigate ... thanks Scott Barnes for reminding me about it! Jesse Liberty is looking for some help organizing and cataloging posts for a new project he's got going: Help Wanted Emil Stoychev posted Slides and demos from my talk on Silverlight 4 From SilverlightCream.com: Silverlight 4 Drag and Drop File Manager Michael Washington has a post up about a Silverlight Drag and Drop File Manager in MVVM, but a secondary important point about the post is that he and Alan Beasley followed strict Designer/Developer rules on this... you recognized Alan's ListBox didn't you? Changing CSS with jQuery syntax in Silverlight using jLight Timmy Kokke is using jLight as introduced in a prior post to interact with the DOM from Silverlight. Essential Silverlight and WPF Skills: The UI Thread, Dispatchers, Background Workers and Async Network Programming Pete Brown has a great backrounder up for WPF and Silverlight devs on threading and networking, good comments too so far. Fluid layout and Fullscreen in Silverlight Paul Yanez has a quick post and demo up on forcing full-screen with a fluid layout, all code included -- and it doesn't take much Data Binding in Silverlight Emil Stoychev has a great long tutorial up on DataBinding in Silverlight ... he hits all the major points with text, samples, and code... definitely one to read! Yet Another MVVM Locator Pattern Another not-necessarily Silverlight post from Jeremy Likness -- but definitely a good one on MVVM and locator patterns. The SpiderWebControl for Silverlight Pavan Podila has a 'SpiderWebControl' for Silverlight 4 up... this is a great network graph control with any sort of feature I can think of... check out the demo, then grab the code... or the other way around, your choice :) Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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  • ArchBeat Link-o-Rama for 11/30/2011

    - by Bob Rhubart
    Coding - the new Latin | @BBCRoryCJ BBC Technology Correspondent Rory Cellan-Jones reports on why "the campaign to boost the teaching of computer skills - particularly coding - in schools is gathering force." BPM Business Value Patterns | SOA Partner Community Blog Juergen Kress shares the presentation he and Matthias Ziegler from Accenture delivered at the SOA & BPM Integration Days event in Germany in October. Coherence 3.7.1 Resources Busy blogger Juergen Kress shares links to screencasts and other resources for those interested in Oracle Coherence 3.7.1. OBIEE 11.1.1 - Introduction to OBIEE 11g Full Sample App "The OBIEE 11g Full Sample App (FSA) is a comprehensive collection of examples designed to demonstrate the latest Oracle BIEE 11g capabilities and design best practices." Solaris 11 Customer Maintenance Lifecycle | Gerry Haskins Gerry Haskins launches a new blog devoted to Solaris "policies, best practices, clarifications, and lots of other stuff." Harnessing Business Events for Predictive Decision Making - part 1 / 3 | Sanjeev Sharma "Data growth is outpacing storage capacity by a factor of two and computing power is still very much bounded by Moore's Law, doubling only every 18 months," says Sanjeev Sharma. The Latest Research from the SEI | Douglas C. SchmidtSchmidt shares information on several recently published Software Engineering Institute (SEI) technical reports that "highlight the latest work of SEI technologists in Agile methods, insider threat,the SMART Grid Maturity Model, acquisition, and CMMI." Tiger/Line Shape Files and Oracle | Bradley D. Brown "Have you ever needed to load an ESRI "shape file" and wondered if that's an easy effort or a difficult effort? I know I have and I assumed that it was a pretty difficult effort. However, I learned today that's actually pretty easy!" -- Oracle ACE Director Bradley Brown of TUSC. Webcast: Enterprise Clouds with Oracle VM Tuesday, December 6, 2011, 9:00 am PT / Noon ET. Featuring Adam Hawley (Senior Director of Product Management, Oracle) and Dan Herrup (Principal Systems Engineer, Oracle Corporate Citizenship). SOA Made Simple; Architects in AZ; Cloud Migration Introduction This week on the Architect Home Page on OTN.

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  • links for 2011-02-25

    - by Bob Rhubart
    The (non) Importance of Language (Enterprise Architecture at Oracle) (tags: ping.fm entarch) ArchBeat (tags: ping.fm) Andrejus Baranovskis's Blog: Beware of Hackers - Keep ADF Task Flows inside WEB-INF Oracle ACE Director Andrejus Baranovskis with a word of caution. (tags: oracle oracleace otn adf) Introduction to WebCenter Personalization: The Conductor; (WebCenter Personalization) Steve Pepper offers an introduction to the Conductor component in Oracle WebCenter Personalization. (tags: oracle otn webcenter enterprise2.0) Batch Aggregation of files in BPEL process instances based on correlation AMIS Technology blog Oracle ACE Director Lucas Jellema shares his solution to a colleague's challenge. (tags: oracle otn oracleace soa bpel) Bradley D. Brown: Watch Out Larry...Here they Come! "Every Fortune 500 company that I've talked to in the last few months is trying to figure out their mobile strategy. Organizations are getting the push from the top down - i.e. executives are asking for data from their mobile devices." - Oracle ACE Director Brad Brown (tags: oracle otn ipad mobilecomputing entarch oracleace) Oracle Technology Network Developer Day - You are the future of Java. Boston, March 3. Designed for the enterprise professional, this event will teach you about the latest developments in the Java Virtual Machine, Java EE, Java SE, Java on the Desktop, and Embedded Java. Whether you're a developer or architect, or managing a team of them, this is an event you can't miss. (tags: oracle otn java)

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  • ArchBeat Link-o-Rama for December 14, 2012

    - by Bob Rhubart
    JMS Step 6 - How to Set Up an AQ JMS (Advanced Queueing JMS) for SOA Purposes | John-Brown Evans John Brown Evans' post continues the series of JMS articles that demonstrate how to use JMS queues in a SOA context. "This example leads you through the creation of an Oracle database Advanced Queue and the related WebLogic server objects in order to use AQ JMS in connection with a SOA composite," John explains. And if you missed the first 5 steps, don't worry – the post includes links. Cloud Deployment Models | B. R. Clouse Looking out for the cloud newbies... "As the cloud paradigm grows in depth and breadth, more readers are approaching the topic for the first time, or from a new perspective," says B. R. Clouse. "This blog is a basic review of cloud deployment models, to help orient newcomers and neophytes." Understanding the JSF Lifecycle and ADF Optimized Lifecycle | Steven Davelaar Would you call that a surprise ending? Oracle WebCenter & ADF Architecture Team (A-Team) member learned a lot more than he expected while creating a UKOUG presentation entitled "What you need to know about JSF to be succesful with ADF." Using Oracle Enterprise Manager Cloud Control 12c with Filer Snapshotting | Porus Homi Havewala This concise technical article includes a script for database backup using snapshots and cataloging in RMAN. Thought for the Day "A program which perfectly meets a lousy specification is a lousy program." — Cem Kaner Source: SoftwareQuotes.com

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  • How to visually "connect" skybox edges with terrain model

    - by David
    I'm working on a simple airplane game where I use skybox cube rendered using disabled depth test. Very close to the bottom side of the skybox is my terrain model. What bothers me is that the terrain is not connected to the skybox bottom. This is not visible while the plane flies low, but as it gets some altitude, the terrain looks smaller because of the perspective. Since the skybox center is always same as the camera position, the skybox moves with the plane, but the terrain goes into the distance. Ok, I think you understand the problem. My question is how to fix it. It's an airplane game so limiting max altitude is not possible. I thought about some way to stretch terrain to always cover whole bottom side of the skybox cube, but that doesn't feel right and I don't even know how would I calculate new terrain dimensions every frame. Here are some screenshot of games where you can clearly see the problem: (oops, I cannot post images yet) darker brown is the skybox bottom here: http://i.stack.imgur.com/iMsAf.png untextured brown is the skybox bottom here: http://i.stack.imgur.com/9oZr7.png

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  • Table header is not shown

    - by Vivien
    My error is that the table headers of my two tables are not shown. Right now I am setting the header with new JTable(data, columnNames). Here is an example which shows, my problem: public class Test extends JFrame { private static final long serialVersionUID = -4682396888922360841L; private JMenuBar menuBar; private JMenu mAbout; private JMenu mMain; private JTabbedPane tabbedPane; public SettingsTab settings = new SettingsTab(); private void addMenuBar() { menuBar = new JMenuBar(); mMain = new JMenu("Main"); mAbout = new JMenu("About"); menuBar.add(mMain); menuBar.add(mAbout); setJMenuBar(menuBar); } public void createTabBar() { tabbedPane = new JTabbedPane(JTabbedPane.TOP); tabbedPane.addTab("Settings", settings.createLayout()); add(tabbedPane); tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT); } private void makeLayout() { setTitle("Test"); setLayout(new BorderLayout()); setPreferredSize(new Dimension(1000, 500)); addMenuBar(); createTabBar(); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); pack(); setVisible(true); } public void start() { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { makeLayout(); } }); } public static void main(String[] args) { Test gui = new Test(); gui.start(); } public class SettingsTab extends JPanel { public JScrollPane createLayout() { JPanel panel = new JPanel(new MigLayout("")); JScrollPane sp = new JScrollPane(panel); sp.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); panel.add(table1(), "growx, wrap"); panel.add(Box.createRigidArea(new Dimension(0,10))); panel.add(table2()); // panel.add(Box.createRigidArea(new Dimension(0,10))); return sp; } public JPanel table1() { JPanel panel1 = new JPanel(); String[] columnNames = {"First Name", "Last Name"}; Object[][] data = { {"Kathy", "Smith"}, {"John", "Doe"}, {"Sue", "Black"}, {"Jane", "White"}, {"Joe", "Brown"}, {"John", "Doe"}, {"Sue", "Black"}, {"Jane", "White"}, {"Joe", "Brown"} }; final JTable table = new JTable(data, columnNames); tableProperties(table); panel1.add(table); panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS)); return panel1; } public JPanel table2() { JPanel panel1 = new JPanel(); String[] columnNames = {"First Name", "Last Name"}; Object[][] data = { {"Kathy", "Smith"}, {"John", "Doe"}, {"Sue", "Black"}, {"Jane", "White"}, {"Joe", "Brown"}, {"John", "Doe"}, {"Sue", "Black"}, {"Jane", "White"}, {"Joe", "Brown"} }; final JTable table = new JTable(data, columnNames); table.setPreferredScrollableViewportSize(new Dimension(500, 70)); table.setFillsViewportHeight(true); tableProperties(table); panel1.add(table); panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS)); return panel1; } public void tableProperties(JTable table) { table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS); table.repaint(); table.revalidate(); } } } Any recommendations what I am doing wrong?

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  • Recent Innovations to ILOM

    - by B.Koch
    by Josh Rosen If you are wondering how Oracle can make some of the most advanced, reliable, and fault tolerant servers on the market, look no further than Oracle Integrated Lights Out Manager or ILOM.  We build ILOM into every server we create, from Oracle x86 Systems such as X3-2 to the SPARC T-Series family. Oracle ILOM is an embedded service processor, but it's really more than that.  It's a computer within a computer.  It's smart, it's tightly integrated into all aspects of the server's operation, and it's a big reason why Oracle servers are used for some of the most mission-critical workloads out there. To understand the value of ILOM, there is no better place to start than its fault management capability.  We have taken the sophisticated fault management architecture from Solaris, developed and refined over a decade, and built it into each and every ILOM. ILOM detects a potential issue at its earliest stage, watching low-level sensors.   If the root cause of a problem is not clear from a single error reading, ILOM will look for other clues and combine multiple pieces of information to correctly identify a failing component. ILOM provides peace of mind. We tailor our fault management for each new server platform that we produce.  You can rest assured that it's always actively keeping the server healthy.  And if there is a problem, you can be confident it will let you know by sending you a notification by e-mail or trap. We also heard IT managers tell us they needed a Ph.D. in computer engineering to manage today's servers. It doesn't have to be that way.  Thanks to the latest innovations to Oracle ILOM, we present hardware inventory and status in way that makes sense – to anyone.  Green means everything is healthy and red means something is wrong.  When a component needs to be replaced a clear message indicates where the problem is and points you at a knowledge article about that problem.  It's that simple. Simpler management and simple interfaces mean reduced complexity and lower costs to manage.  And we know that's really important. ILOM does all this while also providing advanced service processor features you depend on for managing enterprise class systems.  You can remotely control the server power, interact with a virtual video console for the server, and mount media on the server remotely.  There is no need to spend money on a KVM switch to get this functionality. And when people hear how advanced ILOM is, they can't believe ILOM is free.  All features are enabled and included with each Oracle server that you buy.  There are no advanced licenses you need to purchase or features to unlock. Configuring ILOM has also never been easier.  It is now possible to configure almost all aspects of the server directly from ILOM.  This includes changing BIOS settings, persistently modifying boot order, and optimizing power settings -- all directly from ILOM. But Oracle's innovation does not stop with ILOM.  Oracle has engineered Oracle Enterprise Manager Ops Center to integrate directly with ILOM, providing centralized management across all of our servers. Ops Center will discover each of your Oracle servers over the network by searching for ILOMs.  When it finds one, it knows how to communicate with ILOM to monitoring and configure that server from application to disk. Since every server that Oracle produces, from x86 Systems to SPARC T-Series up and down the line, comes with Oracle ILOM, you can manage all Oracle servers in the same way.  And while all of our servers may have different components on the inside, each with their specialized functions, the way you integrate them and the way you monitor and manage them is exactly the same. Oracle ILOM is state-of-art.  If you are looking for a server that make systems management simple and is easy to integrate and maintain, check out the latest advances to Oracle ILOM. Josh Rosen is a Principal Product Manager at Oracle and previously spent more than a decade as a developer and architect of system management software. Josh has worked on system management for many of Oracle's hardware products ranging from the earliest blade systems to the latest Oracle x86 servers.

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  • Blog Buzz - Devoxx 2011

    - by Janice J. Heiss
    Some day I will make it to Devoxx – for now, I’m content to vicariously follow the blogs of attendees and pick up on what’s happening.  I’ve been doing more blog "fishing," looking for the best commentary on 2011 Devoxx. There’s plenty of food for thought – and the ideas are not half-baked.The bloggers are out in full, offering useful summaries and commentary on Devoxx goings-on.Constantin Partac, a Java developer and a member of Transylvania JUG, a community from Cluj-Napoca/Romania, offers an excellent summary of the Devoxx keynotes. Here’s a sample:“Oracle Opening Keynote and JDK 7, 8, and 9 Presentation•    Oracle is committed to Java and wants to provide support for it on any device.•    JSE 7 for Mac will be released next week.•    Oracle would like Java developers to be involved in JCP, to adopt a JSR and to attend local JUG meetings.•    JEE 7 will be released next year.•    JEE 7 is focused on cloud integration, some of the features are already implemented in glassfish 4 development branch.•    JSE 8 will be release in summer of 2013 due to “enterprise community request” as they can not keep the pace with an 18    month release cycle.•    The main features included in JSE8 are lambda support, project Jigsaw, new Date/Time API, project Coin++ and adding   support for sensors. JSE 9 probably will focus on some of these features:1.    self tuning JVM2.    improved native language integration3.    processing enhancement for big data4.    reification (adding runtime class type info for generic types)5.    unification of primitive and corresponding object classes6.    meta-object protocol in order to use type and methods define in other JVM languages7.    multi-tenancy8.    JVM resource management” Thanks Constantin! Ivan St. Ivanov, of SAP Labs Bulgaria, also commented on the keynotes with a different focus.  He summarizes Henrik Stahl’s look ahead to Java SE 8 and JavaFX 3.0; Cameron Purdy on Java EE and the cloud; celebrated Java Champion Josh Bloch on what’s good and bad about Java; Mark Reinhold’s quick look ahead to Java SE 9; and Brian Goetz on lambdas and default methods in Java SE 8. Here’s St. Ivanov’s account of Josh Bloch’s comments on the pluses of Java:“He started with the virtues of the platform. To name a few:    Tightly specified language primitives and evaluation order – int is always 32 bits and operations are executed always from left  to right, without compilers messing around    Dynamic linking – when you change a class, you need to recompile and rebuild just the jar that has it and not the whole application    Syntax  similarity with C/C++ – most existing developers at that time felt like at home    Object orientations – it was cool at that time as well as functional programming is today    It was statically typed language – helps in faster runtime, better IDE support, etc.    No operator overloading – well, I’m not sure why it is good. Scala has it for example and that’s why it is far better for defining DSLs. But I will not argue with Josh.”It’s worth checking out St. Ivanov’s summary of Bloch’s views on what’s not so great about Java as well. What's Coming in JAX-RS 2.0Marek Potociar, Principal Software Engineer at Oracle and currently specification lead of Java EE RESTful web services API (JAX-RS), blogged on his talk about what's coming in JAX-RS 2.0, scheduled for final release in mid-2012.  Here’s a taste:“Perhaps the most wanted addition to the JAX-RS is the Client API, that would complete the JAX-RS story, that is currently server-side only. In JAX-RS 2.0 we are adding a completely interface-based and fluent client API that blends nicely in with the existing fluent response builder pattern on the server-side. When we started with the client API, the first proposal contained around 30 classes. Thanks to the feedback from our Expert Group we managed to reduce the number of API classes to 14 (2 of them being exceptions)! The resulting is compact while at the same time we still managed to create an API that reflects the method invocation context flow (e.g. once you decide on the target URI and start setting headers on the request, your IDE will not try to offer you a URI setter in the code completion). This is a subtle but very important usability aspect of an API…” Obviously, Devoxx is a great Java conference, one that is hitting this year at a time when much is brewing in the platform and beginning to be anticipated.

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  • Logging Into a site that uses Live.com authentication with C#

    - by Josh
    I've been trying to automate a log in to a website I frequent, www.bungie.net. The site is associated with Microsoft and Xbox Live, and as such makes uses of the Windows Live ID API when people log in to their site. I am relatively new to creating web spiders/robots, and I worry that I'm misunderstanding some of the most basic concepts. I've simulated logins to other sites such as Facebook and Gmail, but live.com has given me nothing but trouble. Anyways, I've been using Wireshark and the Firefox addon Tamper Data to try and figure out what I need to post, and what cookies I need to include with my requests. As far as I know these are the steps one must follow to log in to this site. 1. Visit https: //login.live.com/login.srf?wa=wsignin1.0&rpsnv=11&ct=1268167141&rver=5.5.4177.0&wp=LBI&wreply=http:%2F%2Fwww.bungie.net%2FDefault.aspx&id=42917 2. Recieve the cookies MSPRequ and MSPOK. 3. Post the values from the form ID "PPSX", the values from the form ID "PPFT", your username, your password all to a changing URL similar to: https: //login.live.com/ppsecure/post.srf?wa=wsignin1.0&rpsnv=11&ct= (there are a few numbers that change at the end of that URL) 4. Live.com returns the user a page with more hidden forms to post. The client then posts the values from the form "ANON", the value from the form "ANONExp" and the values from the form "t" to the URL: http ://www.bung ie.net/Default.aspx?wa=wsignin1.0 5. After posting that data, the user is returned a variety of cookies the most important of which is "BNGAuth" which is the log in cookie for the site. Where I am having trouble is on fifth step, but that doesn't neccesarily mean I've done all the other steps correctly. I post the data from "ANON", "ANONExp" and "t" but instead of being returned a BNGAuth cookie, I'm returned a cookie named "RSPMaybe" and redirected to the home page. When I review the Wireshark log, I noticed something that instantly stood out to me as different between the log when I logged in with Firefox and when my program ran. It could be nothing but I'll include the picture here for you to review. I'm being returned an HTTP packet from the site before I post the data in the fourth step. I'm not sure how this is happening, but it must be a side effect from something I'm doing wrong in the HTTPS steps. ![alt text][1] http://img391.imageshack.us/img391/6049/31394881.gif using System; using System.Collections.Generic; using System.Collections.Specialized; using System.Text; using System.Net; using System.IO; using System.IO.Compression; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; using System.Web; namespace SpiderFromScratch { class Program { static void Main(string[] args) { CookieContainer cookies = new CookieContainer(); Uri url = new Uri("https://login.live.com/login.srf?wa=wsignin1.0&rpsnv=11&ct=1268167141&rver=5.5.4177.0&wp=LBI&wreply=http:%2F%2Fwww.bungie.net%2FDefault.aspx&id=42917"); HttpWebRequest http = (HttpWebRequest)HttpWebRequest.Create(url); http.Timeout = 30000; http.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 (.NET CLR 3.5.30729)"; http.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; http.Headers.Add("Accept-Language", "en-us,en;q=0.5"); http.Headers.Add("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7"); http.Headers.Add("Keep-Alive", "300"); http.Referer = "http://www.bungie.net/"; http.ContentType = "application/x-www-form-urlencoded"; http.CookieContainer = new CookieContainer(); http.Method = WebRequestMethods.Http.Get; HttpWebResponse response = (HttpWebResponse)http.GetResponse(); StreamReader readStream = new StreamReader(response.GetResponseStream()); string HTML = readStream.ReadToEnd(); readStream.Close(); //gets the cookies (they are set in the eighth header) string[] strCookies = response.Headers.GetValues(8); response.Close(); string name, value; Cookie manualCookie; for (int i = 0; i < strCookies.Length; i++) { name = strCookies[i].Substring(0, strCookies[i].IndexOf("=")); value = strCookies[i].Substring(strCookies[i].IndexOf("=") + 1, strCookies[i].IndexOf(";") - strCookies[i].IndexOf("=") - 1); manualCookie = new Cookie(name, "\"" + value + "\""); Uri manualURL = new Uri("http://login.live.com"); http.CookieContainer.Add(manualURL, manualCookie); } //stores the cookies to be used later cookies = http.CookieContainer; //Get the PPSX value string PPSX = HTML.Remove(0, HTML.IndexOf("PPSX")); PPSX = PPSX.Remove(0, PPSX.IndexOf("value") + 7); PPSX = PPSX.Substring(0, PPSX.IndexOf("\"")); //Get this random PPFT value string PPFT = HTML.Remove(0, HTML.IndexOf("PPFT")); PPFT = PPFT.Remove(0, PPFT.IndexOf("value") + 7); PPFT = PPFT.Substring(0, PPFT.IndexOf("\"")); //Get the random URL you POST to string POSTURL = HTML.Remove(0, HTML.IndexOf("https://login.live.com/ppsecure/post.srf?wa=wsignin1.0&rpsnv=11&ct=")); POSTURL = POSTURL.Substring(0, POSTURL.IndexOf("\"")); //POST with cookies http = (HttpWebRequest)HttpWebRequest.Create(POSTURL); http.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 (.NET CLR 3.5.30729)"; http.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; http.Headers.Add("Accept-Language", "en-us,en;q=0.5"); http.Headers.Add("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7"); http.Headers.Add("Keep-Alive", "300"); http.CookieContainer = cookies; http.Referer = "https://login.live.com/login.srf?wa=wsignin1.0&rpsnv=11&ct=1268158321&rver=5.5.4177.0&wp=LBI&wreply=http:%2F%2Fwww.bungie.net%2FDefault.aspx&id=42917"; http.ContentType = "application/x-www-form-urlencoded"; http.Method = WebRequestMethods.Http.Post; Stream ostream = http.GetRequestStream(); //used to convert strings into bytes System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding(); //Post information byte[] buffer = encoding.GetBytes("PPSX=" + PPSX +"&PwdPad=IfYouAreReadingThisYouHaveTooMuc&login=YOUREMAILGOESHERE&passwd=YOURWORDGOESHERE" + "&LoginOptions=2&PPFT=" + PPFT); ostream.Write(buffer, 0, buffer.Length); ostream.Close(); HttpWebResponse response2 = (HttpWebResponse)http.GetResponse(); readStream = new StreamReader(response2.GetResponseStream()); HTML = readStream.ReadToEnd(); response2.Close(); ostream.Dispose(); foreach (Cookie cookie in response2.Cookies) { Console.WriteLine(cookie.Name + ": "); Console.WriteLine(cookie.Value); Console.WriteLine(cookie.Expires); Console.WriteLine(); } //SET POSTURL value string POSTANON = "http://www.bungie.net/Default.aspx?wa=wsignin1.0"; //Get the ANON value string ANON = HTML.Remove(0, HTML.IndexOf("ANON")); ANON = ANON.Remove(0, ANON.IndexOf("value") + 7); ANON = ANON.Substring(0, ANON.IndexOf("\"")); ANON = HttpUtility.UrlEncode(ANON); //Get the ANONExp value string ANONExp = HTML.Remove(0, HTML.IndexOf("ANONExp")); ANONExp = ANONExp.Remove(0, ANONExp.IndexOf("value") + 7); ANONExp = ANONExp.Substring(0, ANONExp.IndexOf("\"")); ANONExp = HttpUtility.UrlEncode(ANONExp); //Get the t value string t = HTML.Remove(0, HTML.IndexOf("id=\"t\"")); t = t.Remove(0, t.IndexOf("value") + 7); t = t.Substring(0, t.IndexOf("\"")); t = HttpUtility.UrlEncode(t); //POST the Info and Accept the Bungie Cookies http = (HttpWebRequest)HttpWebRequest.Create(POSTANON); http.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.8) Gecko/20100202 Firefox/3.5.8 (.NET CLR 3.5.30729)"; http.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; http.Headers.Add("Accept-Language", "en-us,en;q=0.5"); http.Headers.Add("Accept-Encoding", "gzip,deflate"); http.Headers.Add("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7"); http.Headers.Add("Keep-Alive", "115"); http.CookieContainer = new CookieContainer(); http.ContentType = "application/x-www-form-urlencoded"; http.Method = WebRequestMethods.Http.Post; http.Expect = null; ostream = http.GetRequestStream(); int test = ANON.Length; int test1 = ANONExp.Length; int test2 = t.Length; buffer = encoding.GetBytes("ANON=" + ANON +"&ANONExp=" + ANONExp + "&t=" + t); ostream.Write(buffer, 0, buffer.Length); ostream.Close(); //Here lies the problem, I am not returned the correct cookies. HttpWebResponse response3 = (HttpWebResponse)http.GetResponse(); GZipStream gzip = new GZipStream(response3.GetResponseStream(), CompressionMode.Decompress); readStream = new StreamReader(gzip); HTML = readStream.ReadToEnd(); //gets both cookies string[] strCookies2 = response3.Headers.GetValues(11); response3.Close(); } } } This has given me problems and I've put many hours into learning about HTTP protocols so any help would be appreciated. If there is an article detailing a similar log in to live.com feel free to point the way. I've been looking far and wide for any articles with working solutions. If I could be clearer, feel free to ask as this is my first time using Stack Overflow. Cheers, --Josh

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  • Make a Perl-style regex interpreter behave like a basic or extended regex interpreter

    - by Barry Brown
    I am writing a tool to help students learn regular expressions. I will probably be writing it in Java. The idea is this: the student types in a regular expression and the tool shows which parts of a text will get matched by the regex. Simple enough. But I want to support several different regex "flavors" such as: Basic regular expressions (think: grep) Extended regular expressions (think: egrep) A subset of Perl regular expressions, including the character classes \w, \s, etc. Sed-style regular expressions Java has the java.util.Regex class, but it supports only Perl-style regular expressions, which is a superset of the basic and extended REs. What I think I need is a way to take any given regular expression and escape the meta-characters that aren't part of a given flavor. Then I could give it to the Regex object and it would behave as if it was written for the selected RE interpreter. For example, given the following regex: ^\w+[0-9]{5}-(\d{4})?$ As a basic regular expression, it would be interpreted as: ^\\w\+[0-9]\{5\}-\(\\d\{4\}\)\?$ As an extended regular expression, it would be: ^\\w+[0-9]{5}-(\\d{4})?$ And as a Perl-style regex, it would be the same as the original expression. Is there a "regular expression for regular expressions" than I could run through a regex search-and-replace to quote the non-meta characters? What else could I do? Are there alternative Java classes I could use?

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  • ASP. NET MVC2: Where abouts do I set Current.User from a Session variable?

    - by Adam Brown
    Hi, I'm trying to get authentication and authorisation working in an ASP .NET MVC2 site. I've read loads of tutorials and some books which explain how you can use attributes to require authorisation (and membership in a role) like this: [Authorize(Roles="Admin")] public ActionResult Index() { return View(); } I've made classes that implement IIdentity and IPrincipal, I create a userPrincipal object once the user has successfully logged in and I add it to a session variable. When the user goes to another page I want it to set the HttpContext.Current.User to the object that I stored in the session, something like this: if (Session["User"] != null) { HttpContext.Current.User = Session["User"] as MyUser; } My question is: Where abouts do I put the code directly above? I tried Application_AuthenticateRequest but it tells me Session state is not available in this context. Many thanks.

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  • Very basic running of drools 5, basic setup and quickstart

    - by Berlin Brown
    Is there a more comprehensive quick start for drools 5. I was attempting to run the simple Hello World .drl rule but I wanted to do it through an ant script, possibly with just javac/java: I get the following error: Note: I don't am running completely without Eclipse or any other IDE: Is there a more comprehensive quick start for drools 5. I was attempting to run the simple Hello World .drl rule but I wanted to do it through an ant script, possibly with just javac/java: I get the following error: Note: I don't am running completely without Eclipse or any other IDE: test: [java] Exception in thread "main" org.drools.RuntimeDroolsException: Unable to load d ialect 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java:org.drools.rule .builder.dialect.java.JavaDialectConfiguration' [java] at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuild erConfiguration.java:274) [java] at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurati onMap(PackageBuilderConfiguration.java:259) [java] at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConf iguration.java:176) [java] at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderCo nfiguration.java:153) [java] at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:242) [java] at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:142) [java] at org.drools.builder.impl.KnowledgeBuilderProviderImpl.newKnowledgeBuilde r(KnowledgeBuilderProviderImpl.java:29) [java] at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(Knowledg eBuilderFactory.java:29) [java] at org.berlin.rpg.rules.Rules.rules(Rules.java:33) [java] at org.berlin.rpg.rules.Rules.main(Rules.java:73) [java] Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not in the classpath [java] at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompil er(JavaDialectConfiguration.java:94) [java] at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(Java DialectConfiguration.java:55) [java] at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuild erConfiguration.java:270) [java] ... 9 more [java] Java Result: 1 ... ... I do include the following libraries with my javac and java target: <path id="classpath"> <pathelement location="${lib.dir}" /> <pathelement location="${lib.dir}/drools-api-5.0.1.jar" /> <pathelement location="${lib.dir}/drools-compiler-5.0.1.jar" /> <pathelement location="${lib.dir}/drools-core-5.0.1.jar" /> <pathelement location="${lib.dir}/janino-2.5.15.jar" /> </path> Here is the Java code that is throwing the error. I commented out the java.compiler code, that didn't work either. public void rules() { /* final Properties properties = new Properties(); properties.setProperty( "drools.dialect.java.compiler", "JANINO" ); PackageBuilderConfiguration cfg = new PackageBuilderConfiguration( properties ); JavaDialectConfiguration javaConf = (JavaDialectConfiguration) cfg.getDialectConfiguration( "java" ); */ final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); // this will parse and compile in one step kbuilder.add(ResourceFactory.newClassPathResource("HelloWorld.drl", Rules.class), ResourceType.DRL); // Check the builder for errors if (kbuilder.hasErrors()) { System.out.println(kbuilder.getErrors().toString()); throw new RuntimeException("Unable to compile \"HelloWorld.drl\"."); } // Get the compiled packages (which are serializable) final Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages(); // Add the packages to a knowledgebase (deploy the knowledge packages). final KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(pkgs); final StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); ksession.setGlobal("list", new ArrayList<Object>()); ksession.addEventListener(new DebugAgendaEventListener()); ksession.addEventListener(new DebugWorkingMemoryEventListener()); // Setup the audit logging KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "log/helloworld"); final Message message = new Message(); message.setMessage("Hello World"); message.setStatus(Message.HELLO); ksession.insert(message); ksession.fireAllRules(); logger.close(); ksession.dispose(); } ... Here I don't think Ant is relevant because I have fork set to true: <target name="test" depends="compile"> <java classname="org.berlin.rpg.rules.Rules" fork="true"> <classpath refid="classpath.rt" /> <classpath> <pathelement location="${basedir}" /> <pathelement location="${build.classes.dir}" /> </classpath> </java> </target> The error is thrown at line 1. Basically, I haven't done anything except call final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); I am running with Windows XP, Java6, and within Ant.1.7. The most recent (as of yesterday) version 5 of Drools-Rules.

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  • ANTLR AST rules fail with RewriteEmptyStreamException

    - by Barry Brown
    I have a simple grammar: grammar sample; options { output = AST; } assignment : IDENT ':=' expr ';' ; expr : factor ('*' factor)* ; factor : primary ('+' primary)* ; primary : NUM | '(' expr ')' ; IDENT : ('a'..'z')+ ; NUM : ('0'..'9')+ ; WS : (' '|'\n'|'\t'|'\r')+ {$channel=HIDDEN;} ; Now I want to add some rewrite rules to generate an AST. From what I've read online and in the Language Patterns book, I should be able to modify the grammar like this: assignment : IDENT ':=' expr ';' -> ^(':=' IDENT expr) ; expr : factor ('*' factor)* -> ^('*' factor+) ; factor : primary ('+' primary)* -> ^('+' primary+) ; primary : NUM | '(' expr ')' -> ^(expr) ; But it does not work. Although it compiles fine, when I run the parser I get a RewriteEmptyStreamException error. Here's where things get weird. If I define the pseudo tokens ADD and MULT and use them instead of the tree node literals, it works without error. tokens { ADD; MULT; } expr : factor ('*' factor)* -> ^(MULT factor+) ; factor : primary ('+' primary)* -> ^(ADD primary+) ; Alternatively, if I use the node suffix notation, it also appears to work fine: expr : factor ('*'^ factor)* ; factor : primary ('+'^ primary)* ; Is this discrepancy in behavior a bug?

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  • Convert Environment.OSVersion to NTDDI version format

    - by David Brown
    In sdkddkver.h of the Windows Platform SDK, there are various OS versions defined as NTDDI_*. For example, Windows XP and its service packs are defined as: #define NTDDI_WINXP 0x05010000 #define NTDDI_WINXPSP1 0x05010100 #define NTDDI_WINXPSP2 0x05010200 #define NTDDI_WINXPSP3 0x05010300 #define NTDDI_WINXPSP4 0x05010400 There are also masks which, along with the OSVER, SPVER, and SUBVER macros, allow you to pull the respective parts out of the NTDDI version. #define OSVERSION_MASK 0xFFFF0000 #define SPVERSION_MASK 0x0000FF00 #define SUBVERSION_MASK 0x000000FF I have all of these defined as constants in C# and what I'd like to do now is convert the data returned by Environment.OSVersion to a value corresponding to one of the NTDDI versions in sdkddkver.h. I could make a massive switch statement, but that's not really as future-proof as I'd like it to be. I would need to update the conversion method every time a new OS or service pack is released. I have a feeling this could be done with the help of some bitwise operators, but I'll be honest and say that those aren't my strong point. I appreciate any help!

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  • Why does Graphviz fail on gvLayout?

    - by David Brown
    Once again, here I am writing C without really knowing what I'm doing... I've slapped together a simple function that I can call from a C# program that takes a DOT string, an output format, and a file name and renders a graph using Graphviz. #include "types.h" #include "graph.h" #include "gvc.h" #define FUNC_EXPORT __declspec(dllexport) // Return codes #define GVUTIL_SUCCESS 0 #define GVUTIL_ERROR_GVC 1 #define GVUTIL_ERROR_DOT 2 #define GVUTIL_ERROR_LAYOUT 3 #define GVUTIL_ERROR_RENDER 4 FUNC_EXPORT int RenderDot(char * dotData, const char * format, const char * fileName) { Agraph_t * g; // The graph GVC_t * gvc; // The Graphviz context int result; // Result of layout and render operations // Create a new graphviz context gvc = gvContext(); if (!gvc) return GVUTIL_ERROR_GVC; // Read the DOT data into the graph g = agmemread(dotData); if (!g) return GVUTIL_ERROR_DOT; // Layout the graph result = gvLayout(gvc, g, "dot"); if (result) return GVUTIL_ERROR_LAYOUT; // Render the graph result = gvRenderFilename(gvc, g, format, fileName); if (result) return GVUTIL_ERROR_RENDER; // Free the layout gvFreeLayout(gvc, g); // Close the graph agclose(g); // Free the graphviz context gvFreeContext(gvc); return GVUTIL_SUCCESS; } It compiles fine, but when I call it, I get GVUTIL_ERROR_LAYOUT. At first, I thought it might have been how I was declaring my P/Invoke signature, so I tested it from a C program instead, but it still failed in the same way. RenderDot("digraph graphname { a -> b -> c; }", "png", "C:\testgraph.png"); Did I miss something? EDIT If there's a chance it has to do with how I'm compiling the code, here's the command I'm using: cl gvutil.c /I "C:\Program Files (x86)\Graphviz2.26\include\graphviz" /LD /link /LIBPATH:"C:\Program Files (x86)\Graphviz2.26\lib\release" gvc.lib graph.lib cdt.lib pathplan.lib I've been following this tutorial that explains how to use Graphviz as a library, so I linked to the .lib files that it listed.

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  • Game loop and time tracking

    - by David Brown
    Maybe I'm just an idiot, but I've been trying to implement a game loop all day and it's just not clicking. I've read literally every article I could find on Google, but the problem is that they all use different timing mechanisms, which makes them difficult to apply to my particular situation (some use milliseconds, other use ticks, etc). Basically, I have a Clock object that updates each time the game loop executes. internal class Clock { public static long Timestamp { get { return Stopwatch.GetTimestamp(); } } public static long Frequency { get { return Stopwatch.Frequency; } } private long _startTime; private long _lastTime; private TimeSpan _totalTime; private TimeSpan _elapsedTime; /// <summary> /// The amount of time that has passed since the first step. /// </summary> public TimeSpan TotalTime { get { return _totalTime; } } /// <summary> /// The amount of time that has passed since the last step. /// </summary> public TimeSpan ElapsedTime { get { return _elapsedTime; } } public Clock() { Reset(); } public void Reset() { _startTime = Timestamp; _lastTime = 0; _totalTime = TimeSpan.Zero; _elapsedTime = TimeSpan.Zero; } public void Tick() { long currentTime = Timestamp; if (_lastTime == 0) _lastTime = currentTime; _totalTime = TimestampToTimeSpan(currentTime - _startTime); _elapsedTime = TimestampToTimeSpan(currentTime - _lastTime); _lastTime = currentTime; } public static TimeSpan TimestampToTimeSpan(long timestamp) { return TimeSpan.FromTicks( (timestamp * TimeSpan.TicksPerSecond) / Frequency); } } I based most of that on the XNA GameClock, but it's greatly simplified. Then, I have a Time class which holds various times that the Update and Draw methods need to know. public class Time { public TimeSpan ElapsedVirtualTime { get; internal set; } public TimeSpan ElapsedRealTime { get; internal set; } public TimeSpan TotalVirtualTime { get; internal set; } public TimeSpan TotalRealTime { get; internal set; } internal Time() { } internal Time(TimeSpan elapsedVirtualTime, TimeSpan elapsedRealTime, TimeSpan totalVirutalTime, TimeSpan totalRealTime) { ElapsedVirtualTime = elapsedVirtualTime; ElapsedRealTime = elapsedRealTime; TotalVirtualTime = totalVirutalTime; TotalRealTime = totalRealTime; } } My main class keeps a single instance of Time, which it should constantly update during the game loop. So far, I have this: private static void Loop() { do { Clock.Tick(); Time.TotalRealTime = Clock.TotalTime; Time.ElapsedRealTime = Clock.ElapsedTime; InternalUpdate(Time); InternalDraw(Time); } while (!_exitRequested); } The real time properties of the time class turn out great. Now I'd like to get a proper update/draw loop working so that the state is updated a variable number of times per frame, but at a fixed timestep. At the same time, the Time.TotalVirtualTime and Time.ElapsedVirtualTime should be updated accordingly. In addition, I intend for this to support multiplayer in the future, in case that makes any difference to the design of the game loop. Any tips or examples on how I could go about implementing this (aside from links to articles)?

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  • Common idiom in Java to Scala, traverse/Iterate Java list into Scala list

    - by Berlin Brown
    I am processing a XML document and iterating through nodes. I want to iterate through the nodes and build a new List of some type. How would I do this with Scala: Here is my XML traverse code: def findClassRef(xmlNode: Elem) = { xmlNode\"classDef" foreach { (entry) => val name = entry \ "@name" val classid = entry \ "@classId" println(name + "//" + classid) } } Where the line of println is, I want to append elements to a list.

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