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  • How should I generate and store the boundries of a cave?

    - by Bob Roberts
    I am making a small cave copter game (seriously, where did this type of game come from anyway) and I am trying to figure out how to make and store the procedural generated walls. I am thinking about creating the walls by randomly picking two points away from the center of the screen. They will be no closer than the height of helicopter and no further than the edge of the screen, weighted to prefer to go in the same direction as the point prior so I end up with stalactites and stalagmites and not just noise, at set intervals of distance. To store, perhaps parallel arrays/lists, one for distance from center to top screen and one for distance from center to bottom. Am I way off base with my thinking? I just want the cave to be varied and challenging, I just have never worked with generating data like this. Edit: Woah, I just realized that my idea would lead to a player being able to stay in the middle of the screen and win. That isn't right at all. So the very basis of how I was going to generate is wrong. Edit 2: I also realized I left out a very crucial point. Part of the mechanics of the game will let the player go backwards therefor the data structure should be continuous.

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  • Reading OpenDocument spreadsheets using C#

    - by DigiMortal
    Excel with its file formats is not the only spreadsheet application that is widely used. There are also users on Linux and Macs and often they are using OpenOffice and other open-source office packages that use ODF instead of OpenXML. In this post I will show you how to read Open Document spreadsheet in C#. Importer as example My previous post about importers showed you how to build flexible importers support to your web application. This post introduces you practical example of one of my importers. Of course, sensitive code is omitted. We start with ODS importer class and we add new methods as we go. public class OdsImporter : ImporterBase {     public OdsImporter()     {     }       public override string[] SupportedFileExtensions     {         get { return new[] { "ods" }; }     }       public override ImportResult Import(Stream fileStream, long companyId, short year)     {         string contentXml = GetContentXml(fileStream);           var result = new ImportResult();         var doc = XDocument.Parse(contentXml);           var rows = doc.Descendants("{urn:oasis:names:tc:opendocument:xmlns:table:1.0}table-row").Skip(1);           foreach (var row in rows)         {             ImportRow(row, companyId, year, result);         }           return result;     } } The class given here just extends base class for importers (previous post uses interface but as I already told there you move to abstract base class when writing code for real projects). Import method reads data from *.ods file, parses it (it is XML), finds all data rows and imports data. As you may see then first row is skipped. This is because the first row on my sheet is always headers row. Reading ODS file Our import method starts with getting XML from *.ods file. ODS files like OpenXml files are zipped containers that contain different files. We need content.xml as all data is kept there. To get the contents of file we use SharpZipLib library to read uploaded file as *.zip file. private static string GetContentXml(Stream fileStream) {     var contentXml = "";       using (var zipInputStream = new ZipInputStream(fileStream))     {         ZipEntry contentEntry = null;         while ((contentEntry = zipInputStream.GetNextEntry()) != null)         {             if (!contentEntry.IsFile)                 continue;             if (contentEntry.Name.ToLower() == "content.xml")                 break;         }           if (contentEntry.Name.ToLower() != "content.xml")         {             throw new Exception("Cannot find content.xml");         }           var bytesResult = new byte[] { };         var bytes = new byte[2000];         var i = 0;           while ((i = zipInputStream.Read(bytes, 0, bytes.Length)) != 0)         {             var arrayLength = bytesResult.Length;             Array.Resize<byte>(ref bytesResult, arrayLength + i);             Array.Copy(bytes, 0, bytesResult, arrayLength, i);         }         contentXml = Encoding.UTF8.GetString(bytesResult);     }     return contentXml; } If here is content.xml file then we stop browsing the file. We read this file to memory and return it as UTF-8 format string. Importing rows Our last task is to import rows. We use special method for this as we have to handle some tricks here. To keep files smaller the cell count on row is not always the same. If we have more than one empty cell one after another then ODS keeps only one cell for sequential empty cells. This cell has attribute called number-columns-repeated and it’s value is set to the number of sequential empty cells. This is why we use two indexers for cells collection. private void ImportRow(XElement row, ImportResult result) {     var cells = (from c in row.Descendants()                 where c.Name == "{urn:oasis:names:tc:opendocument:xmlns:table:1.0}table-cell"                 select c).ToList();       var dto = new DataDto();       var count = cells.Count;     var j = -1;       for (var i = 0; i < count; i++)     {         j++;         var cell = cells[i];         var attr = cell.Attribute("{urn:oasis:names:tc:opendocument:xmlns:table:1.0}number-columns-repeated");         if (attr != null)         {             var numToSkip = 0;             if (int.TryParse(attr.Value, out numToSkip))             {                 j += numToSkip - 1;             }         }           if (i > 30) break;         if (j == 0)         {             dto.SomeProperty = cells[i].Value;         }         if (j == 1)         {             dto.SomeOtherProperty = cells[i].Value;         }         // some more data reading     }       // save data } You can define your own class for import results and add there all problems found during data import. Your application gets the results and shows them to user. Conclusion Reading ODS files may seem to complex task but actually it is very easy if we need only data from those documents. We can use some zip-library to get the content file and then parse it to XML. It is not hard to go through the XML but there are some optimization tricks we have to know. The code here is safe to use in web applications as it is not using any API-s that may have special needs to server and infrastructure.

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  • CodePlex Daily Summary for Thursday, June 05, 2014

    CodePlex Daily Summary for Thursday, June 05, 2014Popular Releases51Degrees - Device Detection and Redirection: 3.1.2.3: Version 3.1 HighlightsDevice detection algorithm is over 100 times faster. Regular expressions and levenshtein distance calculations are no longer used. The device detection algorithm performance is no longer limited by the number of device combinations contained in the dataset. Two modes of operation are available: Memory – the detection data set is loaded into memory and there is no continuous connection to the source data file. Slower initialisation time but faster detection performanc...CS-Script for Notepad++ (C# intellisense and code execution): Release v1.0.27.0: CodeMap now indicates the type name for all members Implemented running scripts 'as administrator'. Just add '//css_npp asadmin' to the script and run it as usual. 'Prepare script for distribution' now aggregates script dependency assemblies. Various improvements in CodeSnipptet, Autcompletion and MethodInfo interactions with each other. Added printing line number for the entries in CodeMap (subject of configuration value) Improved debugging step indication for classless scripts ...Load Runner - HTTP Pressure Test Tool: Load Runner 1.1: 1. added support for measuring total in time / hits / traffic / requests 2. abstracted log, default log to console / text file 3. refactored codeKartris E-commerce: Kartris v2.6003: Bug fixes: Fixed issue where category could not be saved if parent categories not altered Updated split string function to 500 chars otherwise problems with attribute filtering in PowerPack Improvements: If a user has group pricing below that available through qty discounts, that will show in place of the qty discountMagicaVoxel: MagicaVoxel Renderer ver 0.01: MagicaVoxel Renderer (Win 0.01)ClosedXML - The easy way to OpenXML: ClosedXML 0.72.3: 70426e13c415 ClosedXML for .Net 4.0 now uses Open XML SDK 2.5 b9ef53a6654f Merge branch 'master' of https://git01.codeplex.com/forks/vbjay/closedxml 727714e86416 Fix range.Merge(Boolean) for .Net 3.5 eb1ed478e50e Make public range.Merge(Boolean checkIntersects) 6284cf3c3991 More performance improvements when saving.MCE Controller: MCE Controller V1.8.6: BETA. Adds option to disable all internal commands. If the "Disable Internal Commands" checkbox in settings is checked, MCE Controller will disable all internally defined commands (e.g. VK key codes, single characters, mouse commands, etc...) and only respond to commands defined in the MCEControl.commmands file. Attempts to fix inability for clients to reconnect after they forcibly close the connection. Build 1.8.6.37445Visual F# Tools: Daily Builds Preview 06-04-2014: This preview is released for use under a proprietary license.SEToolbox: SEToolbox 01.032.018 Release 1: Added ability to merge/join two ships, regardless of origin. Added Language selection menu to set display text language (for SE resources only), and fixed inherent issues. Added full support for Dedicated Servers, allowing use on PC without Steam present, and only the Dedicated Server install. Added Browse button for used specified save game selection in Load dialog. Installation of this version will replace older version.Service monitor: Version 3.1: Added the ability of the tool to restart itself in 'Admin' mode without UAC prompt. Note that this only works after the tool has run in 'Admin' mode at least once before. This is only supported on Vista, Windows 7 or later. See my blog post on how it is done.DNN Blog: 06.00.07: Highlights: Enhancement: Option to show management panel on child modules Fix: Changed SPROC and code to ensure the right people are notified of pending comments. (CP-24018) Fix: Fix to have notification actions authentication assume the right module id so these will work from the messaging center (CP-24019) Fix: Fix to issue in categories in a post that will not save when no categories and no tags selectedTEncoder: 4.0.0: --4.0.0 -Added: Video downloader -Added: Total progress will be updated more smoothly -Added: MP4Box progress will be shown -Added: A tool to create gif image from video -Added: An option to disable trimming -Added: Audio track option won't be used for mpeg sources as default -Fixed: Subtitle position wasn't used -Fixed: Duration info in the file list wasn't updated after trimming -Updated: FFMpegQuickMon: Version 3.14 (Pie release): This is unofficially the 'Pie' release. There are two big changes.1. 'Presets' - basically templates. Future releases might build on this to allow users to add more presets. 2. MSI Installer now allows you to choose components (in case you don't want all collectors etc.). This means you don't have to download separate components anymore (AllAgents.zip still included in case you want to use them separately) Some other changes:1. Add/changed default file extension for monitor packs to *.qmp (...VeraCrypt: VeraCrypt version 1.0d: Changes between 1.0c and 1.0d (03 June 2014) : Correct issue while creating hidden operating system. Minor fixes (look at git history for more details).Keepass2Android: 0.9.4-pre1: added plug-in support: See settings for how to get plug-ins! published QR plug-in (scan passwords, display passwords as QR code, transfer entries to other KP2A devices) published InputStick plugin (transfer credentials to your PC via bluetooth - requires InputStick USB stick) Third party apps can now simply implement querying KP2A for credentials. Are you a developer? Please add this to your app if suitable! added TOTP support (compatible with KeeOTP and TrayTotp) app should no l...Microsoft Web Protection Library: AntiXss Library 4.3.0: Download from nuget or the Microsoft Download Center This issue finally addresses the over zealous behaviour of the HTML Sanitizer which should now function as expected once again. HTML encoding has been changed to safelist a few more characters for webforms compatibility. This will be the last version of AntiXSS that contains a sanitizer. Any new releases will be encoding libraries only. We recommend you explore other sanitizer options, for example AntiSamy https://www.owasp.org/index....Z SqlBulkCopy Extensions: SqlBulkCopy Extensions 1.0.0: SqlBulkCopy Extensions provide MUST-HAVE methods with outstanding performance missing from the SqlBulkCopy class like Delete, Update, Merge, Upsert. Compatible with .NET 2.0, SQL Server 2000, SQL Azure and more! Bulk MethodsBulkDelete BulkInsert BulkMerge BulkUpdate BulkUpsert Utility MethodsGetSqlConnection GetSqlTransaction You like this library? Find out how and why you should support Z Project Become a Memberhttp://zzzproject.com/resources/images/all/become-a-member.png|ht...Tweetinvi a friendly Twitter C# API: Tweetinvi 0.9.3.x: Timelines- Added all the parameters available from the Timeline Endpoints in Tweetinvi. - This is available for HomeTimeline, UserTimeline, MentionsTimeline // Simple query var tweets = Timeline.GetHomeTimeline(); // Create a parameter for queries with specific parameters var timelineParameter = Timeline.CreateHomeTimelineRequestParameter(); timelineParameter.ExcludeReplies = true; timelineParameter.TrimUser = true; var tweets = Timeline.GetHomeTimeline(timelineParameter); Tweetinvi 0.9.3.1...Sandcastle Help File Builder: Help File Builder and Tools v2014.5.31.0: General InformationIMPORTANT: On some systems, the content of the ZIP file is blocked and the installer may fail to run. Before extracting it, right click on the ZIP file, select Properties, and click on the Unblock button if it is present in the lower right corner of the General tab in the properties dialog. This release completes removal of the branding transformations and implements the new VS2013 presentation style that utilizes the new lightweight website format. Several breaking cha...Magick.NET: Magick.NET 6.8.9.101: Magick.NET linked with ImageMagick 6.8.9.1. Breaking changes: - Int/short Set methods of WritablePixelCollection are now unsigned. - The Q16 build no longer uses HDRI, switch to the new Q16-HDRI build if you need HDRI.New Projects12306helper: 12306 ????2112110044: dasda2112110202: asdfsdfsdfsd2112110298: TieuDan2112110315: vftgcdxfrBaidu PCS: BaiduPCSExcel2Sobek: Here the project Excel2Sobek is hosted. Excel2Sobek is a preprocessor in Excel's VBA for the SOBEK 2 hydrological and hydraulic simulation model by Deltares.Help Desk Pro: Manage a business of customer serviceMARGYE: MARGYE CMS CMR E-CommerceMemberBS: MemberBS20140605MiKroTik API: Api untuk menghubungkan aplikasi anda dengan router Mikrotik.MiniProfiler + Log4Net: Use MiniProfiler and Log4Net in ASP.NET projectStore Apps Unity App Base for Prism: This simple library provides an Application Base for a Windows Store application that automatically connects Unity to provide injection as the container.SuperCaptcha for MVC: Custom captcha control for MVCTC760240: myappwithfailuresWindows Phone 8 Dilbert Comic Reader: Basic WP8.1 app that displays comics from http://www.dilbert.com.x86 Proved: Prove what you run!

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  • What packages are neccessary to have sound output from java applets?

    - by MvG
    I've got a very minimalistic setup of ubuntu precise, created using debootstrap. So please don't assume that any packages are installed just because they usually are. On that system, I'd like to play some sounds from a java applet. However, this always fails with the following error message: javax.sound.midi.MidiUnavailableException: Can not open line at com.sun.media.sound.SoftSynthesizer.open(SoftSynthesizer.java:1132) at com.sun.media.sound.SoftSynthesizer.open(SoftSynthesizer.java:1036) ... Caused by: java.lang.IllegalArgumentException: No line matching interface SourceDataLine supporting format PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian is supported. at javax.sound.sampled.AudioSystem.getLine(AudioSystem.java:476) at javax.sound.sampled.AudioSystem.getSourceDataLine(AudioSystem.java:604) at com.sun.media.sound.SoftSynthesizer.open(SoftSynthesizer.java:1066) ... 35 more As the messages mention a soft synthesizer, and pcm lines, I expect that the lack of some midi daemon is not the issue here. As far as I can tell, the alsa kernel modules are loaded, including snd_hda_intel, snd_pcm, snd_seq_midi among others. I've also included the alsa-base and alsa-utils packages in my installation. alsa-mixer looks good, using “HDA Intel PCH” as its default device. What other packages, configuration settings or daemon startups does java require to make its sound output work?

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  • How to automatically render all opaque meshes with a specific shader?

    - by dsilva.vinicius
    I have a specular outline shader that I want to be used on all opaque meshes of the scene whenever a specific camera renders. The shader is working properly when it is manually applied to some material. The shader is as follows: Shader "Custom/Outline" { Properties { _Color ("Main Color", Color) = (.5,.5,.5,1) _OutlineColor ("Outline Color", Color) = (1,0.5,0,1) _Outline ("Outline width", Range (0.0, 0.1)) = .05 _SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 1) _Shininess ("Shininess", Range (0.03, 1)) = 0.078125 _MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {} } SubShader { Tags { "Queue"="Overlay" "RenderType"="Opaque" } Pass { Name "OUTLINE" Tags { "LightMode" = "Always" } Cull Off ZWrite Off // Uncomment to show outline always. //ZTest Always CGPROGRAM #pragma target 3.0 #pragma vertex vert #pragma fragment frag #include "UnityCG.cginc" struct appdata { float4 vertex : POSITION; float3 normal : NORMAL; }; struct v2f { float4 pos : POSITION; float4 color : COLOR; }; float _Outline; float4 _OutlineColor; v2f vert(appdata v) { // just make a copy of incoming vertex data but scaled according to normal direction v2f o; o.pos = mul(UNITY_MATRIX_MVP, v.vertex); float3 norm = mul ((float3x3)UNITY_MATRIX_IT_MV, v.normal); float2 offset = TransformViewToProjection(norm.xy); o.pos.xy += offset * o.pos.z * _Outline; o.color = _OutlineColor; return o; } float4 frag(v2f fromVert) : COLOR { return fromVert.color; } ENDCG } UsePass "Specular/FORWARD" } FallBack "Specular" } The camera used fot the effect has just a script component which setups the shader replacement: using UnityEngine; using System.Collections; public class DetectiveEffect : MonoBehaviour { public Shader EffectShader; // Use this for initialization void Start () { this.camera.SetReplacementShader(EffectShader, "RenderType=Opaque"); } // Update is called once per frame void Update () { } } Unfortunately, whenever I use this camera I just see the background color. Any ideas?

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  • New partnership allows auto-transposition of client/server application to Windows Azure

    - by Webgui
    The economics of IT is changing rapidly, and organizations are searching to widen and secure availability of their systems and at the same time lower costs which is exactly what the cloud meant to do. Running your systems on Microsoft’s Windows Azure cloud for example would improve and secure the availability, accessibility and scalability (both up and down) of your systems and support the new IT economics. However, in order to take advantage of the cloud's promise of lower cost of ownership, the applications must be built or adjusted to work on that platform and in most cases this is not a simple task.  Even existing web applications cannot always be transferred to Azure without some changes, and for client/server applications, the task is way more challenging even to the point where it seems impossible. The reason is the gaps between the client/server desktop technology and the cloud's. For that reason, most of the known methodologies to migrate existing client/server applications actually involve rewrite of the desktop systems for the cloud. A unique approach is introduced by Visual WebGui which creates a virtualization layer atop ASP.Net web server, it moves the transformed or generated .Net code to that layer, and then using a patent pending protocol it renders a user interface within a plain browser. The end result is pure .NET code that is a base code for a pure rich web application and now due to a collaboration with Microsoft Windows Azure Visual WebGui provides the shortest path from client/server to the Azure cloud by being able to handle close to 95% of the transformation to the cloud platform in an automatic way. Application Migration to Azure without migraines More information about the Instant CloudMove Azure solution here.

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  • Learning Electronics & the Arduino Microcontroller

    - by Chris Williams
    Lately, I've had a growing interest in Electronics & Microcontrollers. I'm a loyal reader of Make Magazine and thoroughly enjoy seeing all the various projects in each issue, even though I rarely try to make any of them. I've been reading and watching videos about the Arduino, which is an open source Microcontroller and software project that the people at Make (and a lot of other folks) are pretty hot about. Even the prebuilt hardware is remarkably inexpensive , although there are kits available to build one from the base components. (Full disclosure: I bought my first soldering iron... EVER... just last week, so I fully acknowledge the likelihood of making some mistakes. That's why I'm not trying to do the "build it yourself" kit just yet. It's also another reason to be happy the hardware is so cheap.) There are a number of different Arduino boards available, but the two that have really piqued my interest are the Arduino UNO and the NETduino. The UNO is a very popular board, with a number of features and is under $35 which means I won't hurl myself off a bridge when I inevitably destroy it. The NETduino is very similar to the Arduino UNO and has the added advantage of being programmable with... you guessed it... C#. I'm actually ordering both boards and some miscellaneous other doodads to go with them.  There are a few good websites for this sort of thing, including www.makershed.com and www.adafruit.com. The price difference is negligible, so in my case, I'm ordering from Maker Shed (the Make Magazine people) because I want to support them. :) I've also picked up a few O'Reilly books on the subject which I am looking forward to reading & reviewing: Make: Electronics, Arduino: A Quick Start Guide and Getting Started With Arduino (all three of which arrived on my doorstep today.) This ties in with my "learn more about robotics" goals as well, since I'll need a good understanding of Electronics if I want to move past Lego Mindstorms eventually.

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  • We'll be at QCon San Francisco!

    - by Carlos Chang
    Oracle Technology Network is a Platinum sponsor at QCon San Francisco. Don’t miss these great developer focused sessions: Shay Shmeltzer - How we simplified Web, Mobile and Cloud development for our own developers? - the Oracle Story Over the past several years, Oracle has beendeveloping a new set of enterprise applications in what is probably one of the largest Java based development project in the world. How do you take 3000 developers and make them productive? How do you insure the delivery of cutting edge UIs for both Mobile and Web channels? How do you enable Cloud based development and deployment? Come and learn how we did it at Oracle, and see how the same technologies and methodologies can apply to your development efforts. Dan Smith - Project Lambda in Java 8 Java SE 8 will include major enhancements to the Java Programming Language and its core libraries.  This suite of new features, known as Project Lambda in the OpenJDK community, includes lambda expressions, default methods, and parallel collections (and much more!).  The result will be a next-generation Java programming experience with more flexibility and better abstractions.   This talk will introduce the new Java features and offer a behind-the-scenes view of how they evolved and why they work the way that they do. Arun Gupta - JSR 356: Building HTML5 WebSocket Applications in Java The family of HTML5 technologies has pushed the pendulum away from rich client technologies and toward ever-more-capable Web clients running on today’s browsers. In particular, WebSocket brings new opportunities for efficient peer-to-peer communication, providing the basis for a new generation of interactive and “live” Web applications. This session examines the efforts under way to support WebSocket in the Java programming model, from its base-level integration in the Java Servlet and Java EE containers to a new, easy-to-use API and toolset that are destined to become part of the standard Java platform. The complete conference schedule is here: http://qconsf.com/sf2012/schedule/wednesday.jsp But wait, there’s more! At the Oracle booth, we’ll also be covering: Oracle ADF Mobile Oracle Developer Cloud Service Oracle ADF Essentials NetBeans Project Easel Hope to see you there! 

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  • Code structure for multiple applications with a common core

    - by Azrael Seraphin
    I want to create two applications that will have a lot of common functionality. Basically, one system is a more advanced version of the other system. Let's call them Simple and Advanced. The Advanced system will add to, extend, alter and sometimes replace the functionality of the Simple system. For instance, the Advanced system will add new classes, add properties and methods to existing Simple classes, change the behavior of classes, etc. Initially I was thinking that the Advanced classes simply inherited from the Simple classes but I can see the functionality diverging quite significantly as development progresses, even while maintaining a core base functionality. For instance, the Simple system might have a Project class with a Sponsor property whereas the Advanced system has a list of Project.Sponsors. It seems poor practice to inherit from a class and then hide, alter or throw away significant parts of its features. An alternative is just to run two separate code bases and copy the common code between them but that seems inefficient, archaic and fraught with peril. Surely we have moved beyond the days of "copy-and-paste inheritance". Another way to structure it would be to use partial classes and have three projects: Core which has the common functionality, Simple which extends the Core partial classes for the simple system, and Advanced which also extends the Core partial classes for the advanced system. Plus having three test projects as well for each system. This seems like a cleaner approach. What would be the best way to structure the solution/projects/code to create two versions of a similar system? Let's say I later want to create a third system called Extreme, largely based on the Advanced system. Do I then create an AdvancedCore project which both Advanced and Extreme extend using partial classes? Is there a better way to do this? If it matters, this is likely to be a C#/MVC system but I'd be happy to do this in any language/framework that is suitable.

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  • Procedural world generation oriented on gameplay features

    - by Richard Fabian
    In large procedural landscape games, the land seems dull, but that's probably because the real world is largely dull, with only limited places where the scenery is dramatic or tactical. Looking at world generation from this point of view, a landscape generator for a game (that is, not for the sake of scenery, but for the sake of gameplay) needs to not follow the rules of landscaping, but instead some rules married to the expectations of the gamer. For example, there could be a choke point / route generator that creates hills ravines, rivers and mountains between cities, rather than the natural way cities arise, scattered on the land based on resources or conditions generated by the mountains and rainfall patterns. Is there any existing work being done like this? Start with cities or population centres and then add in terrain afterwards? The reason I'm asking is that I'd previously pondered taking existing maps from fantasy fiction (my own and others), putting the information into the system as a base point, and then generating a good world to play in from it. This seems covered by existing technology, that is, where the designer puts in all the necessary information such as the city populations, resources, biomes, road networks and rivers, then allows the PCG fill in the gaps. But now I'm wondering if it may be possible to have a content generator generate also the overall design. Generate the cities and population centres, balancing them so that there is a natural seeming need of commerce, then generate the positions and connectivity, then from the type of city produce the list of necessary resources that must be nearby, and only then, maybe given some rules on how to make the journey between cities both believable and interesting, generate the final content including the roads, the choke points, the bridges and tunnels, ferries and the terrain including the biomes and coastline necessary. If this has been done before, I'd like to know, and would like to know what went wrong, and what went right.

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  • Ubuntu 12.04 Server ping gateway responds with destination host unreachable

    - by blckblttkd
    I consider myself fairly avid with Ubuntu and Linux, but this one has me stumped. I built up a Xen Server using Ubuntu 12.04 as the base operating system. It has multiple domUs running on it. My home network has a statically defined network where I got all the network connectivity going peachy. The server was moved to a permanent home this morning. So, the network configuration on the main system had to change. Again, another static network, but now I can't ping the upstream gateway from the host. As the VMs use this NIC over a bridge, they too are broken. Ping responds with "destination host unreachable." I simplified the networking down to a simple static network as seen below (no bridge or anything) just to get it to work. Here's the contents of my /etc/network/interfaces file: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 216.7.188.228 gateway 216.7.188.225 netmask 255.255.255.240 broadcast 216.7.188.255 network 216.7.188.0 dns-nameservers 8.8.8.8 8.8.4.4 Here's the contents of route -n 0.0.0.0 216.7.188.225 0.0.0.0 UG 100 0 0 eth0 216.7.188.224 0.0.0.0 255.255.255.240 U 0 0 0 eth0 And the results of pinging the gateway: PING 216.7.188.225 (216.7.188.225) 56(84) bytes of data. From 216.7.188.228 icmp_seq=1 Destination Host Unreachable From 216.7.188.228 icmp_seq=1 Destination Host Unreachable From 216.7.188.228 icmp_seq=1 Destination Host Unreachable Again, this worked in one network flawlessly (obviously with different parameters in the interfaces file). I did try using eth1 (as there are two NICS on the server (in case the MAC address got flipped on bootup). No success there. Yes, the cable is in the right port now :) Any thoughts? I appreciate the help!

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  • Oracle Linux 6 update 3

    - by wcoekaer
    Oracle Linux 6.3 channels are now available online http://public-yum.oracle.com repositories. Both base channels and latest channels are available (for free for everyone) http://linux.oracle.com repositories. Behind our customer portal but effectively the same content. Source RPMs (.srpm) are being uploaded to http://oss.oracle.com/ol6/SRPMS-updates. OL6.3 contains UEK2 kernel-uek-2.6.39-200.24.1. The source rpm is in the above location but our public GIT repository will be synced up shortly as well at https://oss.oracle.com/git/?p=linux-uek-2.6.39.git;a=summary. Unlike some others, of course, complete source, complete changelog, complete checkin history, both mainline and our own available. No need to go assemble things from a website manually. Another cool thing coming up is a boot iso for OL6.3 that boots up uek (2.6.39-200.24.1) as install kernel and uses btrfs as the default filesystem for installation. So latest and greatest direct access to btrfs, a modern well-tested, current kernel, freely available. Enjoy. Since it takes a few days for our ISOs to be on http://edelivery.oracle.com/linux, I mirrored them on my own server :http://mirrors.wimmekes.net/pub/OracleLinux/

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  • Code contracts and inheritance

    - by DigiMortal
    In my last posting about code contracts I introduced you how to force code contracts to classes through interfaces. In this posting I will go step further and I will show you how code contracts work in the case of inherited classes. As a first thing let’s take a look at my interface and code contracts. [ContractClass(typeof(ProductContracts))] public interface IProduct {     int Id { get; set; }     string Name { get; set; }     decimal Weight { get; set; }     decimal Price { get; set; } }   [ContractClassFor(typeof(IProduct))] internal sealed class ProductContracts : IProduct {     private ProductContracts() { }       int IProduct.Id     {         get         {             return default(int);         }         set         {             Contract.Requires(value > 0);         }     }       string IProduct.Name     {         get         {             return default(string);         }         set         {             Contract.Requires(!string.IsNullOrWhiteSpace(value));             Contract.Requires(value.Length <= 25);         }     }       decimal IProduct.Weight     {         get         {             return default(decimal);         }         set         {             Contract.Requires(value > 3);             Contract.Requires(value < 100);         }     }       decimal IProduct.Price     {         get         {             return default(decimal);         }         set         {             Contract.Requires(value > 0);             Contract.Requires(value < 100);         }     } } And here is the product class that inherits IProduct interface. public class Product : IProduct {     public int Id { get; set; }     public string Name { get; set; }     public virtual decimal Weight { get; set; }     public decimal Price { get; set; } } if we run this code and violate the code contract set to Id we will get ContractException. public class Program {     static void Main(string[] args)     {         var product = new Product();         product.Id = -100;     } }   Now let’s make Product to be abstract class and let’s define new class called Food that adds one more contract to Weight property. public class Food : Product {     public override decimal Weight     {         get         {             return base.Weight;         }         set         {             Contract.Requires(value > 1);             Contract.Requires(value < 10);               base.Weight = value;         }     } } Now we should have the following rules at place for Food: weight must be greater than 1, weight must be greater than 3, weight must be less than 100, weight must be less than 10. Interesting part is what happens when we try to violate the lower and upper limits of Food weight. To see what happens let’s try to violate rules #2 and #4. Just comment one of the last lines out in the following method to test another assignment. public class Program {     static void Main(string[] args)     {         var food = new Food();         food.Weight = 12;         food.Weight = 2;     } } And here are the results as pictures to see where exceptions are thrown. Click on images to see them at original size. Violation of lower limit. Violation of upper limit. As you can see for both violations we get ContractException like expected. Code contracts inheritance is powerful and at same time dangerous feature. Although you can always narrow down the conditions that come from more general classes it is possible to define impossible or conflicting contracts at different points in inheritance hierarchy.

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  • Updating password hashing without forcing a new password for existing users

    - by Willem
    You maintain an existing application with an established user base. Over time it is decided that the current password hashing technique is outdated and needs to be upgraded. Furthermore, for UX reasons, you don't want existing users to be forced to update their password. The whole password hashing update needs to happen behind the screen. Assume a 'simplistic' database model for users that contains: ID Email Password How does one go around to solving such a requirement? My current thoughts are: create a new hashing method in the appropriate class update the user table in the database to hold an additional password field Once a user successfully logs in using the outdated password hash, fill the second password field with the updated hash This leaves me with the problem that I cannot reasonable differentiate between users who have and those who have not updated their password hash and thus will be forced to check both. This seems horribly flawed. Furthermore this basically means that the old hashing technique could be forced to stay indefinitely until every single user has updated their password. Only at that moment could I start removing the old hashing check and remove the superfluous database field. I'm mainly looking for some design tips here, since my current 'solution' is dirty, incomplete and what not, but if actual code is required to describe a possible solution, feel free to use any language.

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  • What do I need to know to design a language and write a interpreter for it?

    - by alFReD NSH
    I know this question has been asked and even there are thousands of books and articles about it. But the problem is that there are too many, and I don't know are they good enough, I have to design a language and write a interpreter for it. The base language is javascript (using nodejs) but it's ok if the compiler was written in another language that I can use from node. I had done a research about compiler compilers in JS, there is jison (Bison implementaion in JS), waxeye, peg.js. I decided to give jison a try, due to the popularity and its being used by coffee script, so it should be able to cover my language too. The grammar definition syntax is similar to bison. But when I tried read the bison manual it seemed very hard to understand for me. And I think it's because I don't know a lot of things about what I'm doing. Like I don't what is formal language theory. I am experienced in Javascript (I'm more talented in JS than most average programmers). And also know basic C and C++ (not much experience but can write a working code for basic things). I haven't had any formal education, so I may not be familiar with some software engineering and computer science principles. Though everyday I try to grasp a lot of articles and improve. So I'm asking if you know any good book or article that can help me. Please also write why the resource you're suggesting is good. --update-- The language I'm trying to create, is not really complicated. All it has is expressions (with or without units), comparisons and logical operators. There are no functions, loops, ... The goal is to create a language that non-programmers can easily learn. And to write customized validations and calculations.

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  • OS X is based on the codex Gigas the devils bible: Android OS n 4.4 Dio Ra Egyptian deity why is that?

    - by user215250
    GUESS WHO? The Internet and all computers are based on a mathematical number system that seems to be 3, 4, 6, 8 and 10. The HTTP is 888P and UTF-8 and Windows 8 and 8 gigas of RAM(88) on a 64biTOS X-10 or Aten(satan) why is it allowed to be so evil and who all knows about it? Is this activity illegal and should I sew these companies for being involved in satanic practices? iC3 iC3 iC3 I do see XP (X) Chi and (P) Rho a monogram and symbol for Christ, consisting of the superimposed Greek letters. The X is ten, The X code, OS X(O Satan) and codex The Gigas the Devil bible and the P is Payne, The House of Payne in which God dwells. Windows 8, Google Android and Apples OS X are the foundation on which we operarte on the Internet and our Mobiles devices. What is it that these 3 companies have chosen to base their OS’s on such evil? Windows 8 is windows hate H8, HH and H8. Said to be the Devil. Google’s (UGLE) M the Masonic M behind Android OS.in 4.4 is Dio (R) DNA O Sin and 44 is the Devils name in Twain’s The Mysterious Stranger. Apple’s evil (i) OS X (ou-es-ten) O Satan them all beat (B8) considering Apple put their first product on the market for $666.66. The Holy Grail of computers they say. Your Excellency, Lord and King OS2 Eisus Uni Peg Unix: The Unicorn Pegasus Jesus Christ

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  • How to manage drawing loop when changing render targets

    - by George Duckett
    I'm managing my game state by having a base GameScreen class with a Draw method. I then have (basically) a stack of GameScreens that I render. I render the bottom one first, as screens above might not completely cover the ones below. I now have a problem where one GameScreen changes render targets while doing its rendering. Anything the previous screens have drawn to the backbuffer is lost (as XNA emulates what happens on the xbox). I don't want to just set the backbuffer to preserve its contents as I want this to work on the xbox as well as PC. How should I manage this problem? A few ideas I've had: Render every GameScreen to its own render target, then render them all to the backbuffer. Create some kind of RenderAction queue where a game screen (and anything else I guess) could queue something to be rendered to the back buffer. They'd render whatever they wanted to any render target as normal, but if they wanted to render to the backbuffer they'd stick that in a queue which would get processed once all rendertarget rendering was done. Abstract away from render targets and backbuffers and have some way of representing the way graphics flows and transforms between render targets and have something manage/work out the correct rendering order (and render targets) given what rendering process needs as input and what it produces as output. I think each of my ideas have pros and cons and there are probably several other ways of approaching this general problem so I'm interested in finding out what solutions are out there.

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  • How do you encode Algebraic Data Types in a C#- or Java-like language?

    - by Jörg W Mittag
    There are some problems which are easily solved by Algebraic Data Types, for example a List type can be very succinctly expressed as: data ConsList a = Empty | ConsCell a (ConsList a) consmap f Empty = Empty consmap f (ConsCell a b) = ConsCell (f a) (consmap f b) l = ConsCell 1 (ConsCell 2 (ConsCell 3 Empty)) consmap (+1) l This particular example is in Haskell, but it would be similar in other languages with native support for Algebraic Data Types. It turns out that there is an obvious mapping to OO-style subtyping: the datatype becomes an abstract base class and every data constructor becomes a concrete subclass. Here's an example in Scala: sealed abstract class ConsList[+T] { def map[U](f: T => U): ConsList[U] } object Empty extends ConsList[Nothing] { override def map[U](f: Nothing => U) = this } final class ConsCell[T](first: T, rest: ConsList[T]) extends ConsList[T] { override def map[U](f: T => U) = new ConsCell(f(first), rest.map(f)) } val l = (new ConsCell(1, new ConsCell(2, new ConsCell(3, Empty))) l.map(1+) The only thing needed beyond naive subclassing is a way to seal classes, i.e. a way to make it impossible to add subclasses to a hierarchy. How would you approach this problem in a language like C# or Java? The two stumbling blocks I found when trying to use Algebraic Data Types in C# were: I couldn't figure out what the bottom type is called in C# (i.e. I couldn't figure out what to put into class Empty : ConsList< ??? >) I couldn't figure out a way to seal ConsList so that no subclasses can be added to the hierarchy What would be the most idiomatic way to implement Algebraic Data Types in C# and/or Java? Or, if it isn't possible, what would be the idiomatic replacement?

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  • How can I use the dualforward parameter in my unity shader to use lightmaps and normal maps together?

    - by Raphaeltm
    I'm using the free version of unity and I would like to combine lightmaps with specularity and normal maps. After doing a -bunch- of research, I've figured out that there doesn't seem to be any easy way to do this in the free version of unity, which doesn't support deferred rendering/easy use of dual lightmaps. However, it looks like it's possible, by writing a custom shader, using the "dualforward" parameter in a shader, switching the lightmapping mode to "dual lightmaps" and turning on "Use in forward ren." (basically, writing a shader that specifies the use of dual lightmaps, which should allow for a combination of lightmaps and normal maps) So I downloaded the source code for the default shaders (because all I need is a normal specular bumped shader) and added "dualforward" to the parameters: Shader "Bumped Specular Dual Lightmaps" { Properties { _Color ("Main Color", Color) = (1,1,1,1) _SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 1) _Shininess ("Shininess", Range (0.03, 1)) = 0.078125 _MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {} _BumpMap ("Normalmap", 2D) = "bump" {} } SubShader { Tags { "RenderType"="Opaque" } LOD 400 CGPROGRAM #pragma surface surf BlinnPhong dualforward sampler2D _MainTex; sampler2D _BumpMap; fixed4 _Color; half _Shininess; struct Input { float2 uv_MainTex; float2 uv_BumpMap; }; void surf (Input IN, inout SurfaceOutput o) { fixed4 tex = tex2D(_MainTex, IN.uv_MainTex); o.Albedo = tex.rgb * _Color.rgb; o.Gloss = tex.a; o.Alpha = tex.a * _Color.a; o.Specular = _Shininess; o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap)); } ENDCG } FallBack "Specular" } This, however, doesn't seem to work. When I keep the "dualforward" param, every object that uses it seems to be lit by the one directional light in the scene. When I remove the "dualforward" param, it they look like normal lightmapped objects with no normal maps or specularity. I noticed that the support for "dualforward" seems to be new in v.3.4.2, so I made sure to download it (I was running 3.4.1), but it still doesn't work. Anybody have any advice for me?

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  • Low-level game engine renderer design

    - by Mark Ingram
    I'm piecing together the beginnings of an extremely basic engine which will let me draw arbitrary objects (SceneObject). I've got to the point where I'm creating a few sensible sounding classes, but as this is my first outing into game engines, I've got the feeling I'm overlooking things. I'm familiar with compartmentalising larger portions of the code so that individual sub-systems don't overly interact with each other, but I'm thinking more of the low-level stuff, starting from vertices working up. So if I have a Vertex class, I can combine that with a list of indices to make a Mesh class. How does the engine determine identical meshes for objects? Or is that left to the level designer? Once we have a Mesh, that can be contained in the SceneObject class. And a list of SceneObject can be placed into the Scene to be drawn. Right now I'm only using OpenGL, but I'm aware that I don't want to be tying OpenGL calls right in to base classes (such as updating the vertices in the Mesh, I don't want to be calling glBufferData etc). Are there any good resources that discuss these issues? Are there any "common" heirachies which should be used?

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  • When creating an library published on CodePlex, how "bad" would it be for the unit-test projects to rely on commercial products?

    - by Lasse V. Karlsen
    I have started a project on CodePlex for a WebDAV server implementation for .NET, so that I can host a WebDAV server in my own programs. This is both a learning/research project (WebDAV + server portion) as well as a project I think I can have much fun with, both in terms of making it and using it. However, I see a need to do mocking of types here in order to unit-testing properly. For instance, I will be relying on HttpListener for the web server portion of the WebDAV server, and since this type has no interface, and is sealed, I cannot easily make mocks or stubs out of it. Unless I use something like TypeMock. So if I used TypeMock in the unit-test projects on this library, how bad would this be for potential users? The projects are made in C# 3.5 for .NET 3.5 and 4.0, and the project files was created with Visual Studio 2010 Professional. The actual class libraries you would end up referencing in your software would of course not be encumbered with anything remotely like this, only the unit-test libraries. What's your thoughts on this? As an example, I have in my old code-base, which is private, the ability to just initiate a WebDAV server with just this: var server = new WebDAVServer(); This constructs, and owns, a HttpListener instance internally, and I would like to verify through unit-tests that if I dispose of this server object, the internal listener is disposed of. If, on the other hand, I use the overload where I hand it a listener object, this object should not be disposed of. Short of exposing the internal listener object to the outside world, something I'm a bit loath to do, how can I in a good way ensure that the object was disposed of? With TypeMock I can mock away parts of this object even though it isn't accessed through interfaces. The alternative would be for me to wrap everything in wrapper classes, where I have complete control.

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  • Problems with wired ethernet connection Ubuntu 11.10

    - by Andrew Fielden
    After some partition shuffling, I've got a problem on my 11.10 system. The wired ethernet interface fails to come up, although the wireless interface is working. I'm using NetworkManager. I thought this may be a problem with NetworkManager, so I checked the config files, which look ok. I then tried re-installing the package, but this didn't resolve the issues. I'm not sure at this point if the problem is due to software configuration, or a hardware problem. I've also tried the cable in other router ports, but same problem. The symptoms are:- System settings - Network reports that the cable is unplugged (it isn't) ifconfig reports the following eth0 Link encap:Ethernet HWaddr f0:4d:a2:a2:a7:fe UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:10 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:792 (792.0 B) TX bytes:0 (0.0 B) Interrupt:46 Base address:0xe000 My /etc/network/interfaces file has the following: auto lo iface lo inet loopback My /etc/resolv.conf file has the following: # Generated by NetworkManager The router's red light is on for this port dmesg reports ADDRCONF(NETDEV_UP): eth0: link is not ready

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  • Strategies for managUse of types in Python

    - by dave
    I'm a long time programmer in C# but have been coding in Python for the past year. One of the big hurdles for me was the lack of type definitions for variables and parameters. Whereas I totally get the idea of duck typing, I do find it frustrating that I can't tell the type of a variable just by looking at it. This is an issue when you look at someone else's code where they've used ambiguous names for method parameters (see edit below). In a few cases, I've added asserts to ensure parameters comply with an expected type but this goes against the whole duck typing thing. On some methods, I'll document the expected type of parameters (eg: list of user objects), but even this seems to go against the idea of just using an object and let the runtime deal with exceptions. What strategies do you use to avoid typing problems in Python? Edit: Example of the parameter naming issues: If our code base we have a task object (ORM object) and a task_obj object (higher level object that embeds a task). Needless to say, many methods accept a parameter named 'task'. The method might expect a task or a task_obj or some other construct such as a dictionary of task properties - it is not clear. It is them up to be to look at how that parameter is used in order to work out what the method expects.

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  • Oracle Database Appliance and Remarketers - A Whole New Opportunity

    - by Martin Morganti
    We have recently had another exciting announcement for the remarketer initiative. The Oracle Database Appliance is now available for resale through your authorized Value Added Distributor. This means that with no fees, no barriers and no upfront commitments, a remarketer can identify and close transactions for the Oracle Database Appliance without having to sign an Oracle contract. In addition, the remarketer is now authorized to sell the Oracle Database Appliance with Oracle Database 11G Enterprise Edition, RAC or RAC One Node software included in the transaction. The availability of the Oracle Database Appliance for remarketers means that a broad base of customers through remarketers can now start engaging with Oracle by taking advantage of this engineered system technology; basically Oracle Hardware and Software Engineered to Work Together to drive incremental revenue. The Oracle Database Appliance is a simple, reliable and affordable way to rapidly deploy a database cluster by plugging in the power; the network and pushing the one button install for the Appliance Manager software. Find out more about the Oracle Database Appliance, including a webinar by Oracle President Mark Hurd, as well as other material to help you better understand the opportunity available to you as remarketers. If you want Oracle to keep you informed about developments in Remarketer complete the free registration, or talk to your local Oracle Remarketer Authorized value added distributors. (Complete list available on the Oracle Remarketer page).

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  • 12.0.4.3 - Missing Battery Icon, auto Suspend not working, Keyboard shortcuts volume up/down no longer working

    - by Navraj
    Problems I am experiencing: Battery Icon not showing up unity bar (top right corner). Volume Up/Down/Mute not working. Bluetooth hot keys described above also not working.Brightness up/down keys on this keyboard no longer working (apple wireless keyboard) Laptop no longer suspends when lid is shut. I have to go to 'power' button on top right corner and click on 'Suspend' All was working flawlessly until I did the following: I have recently upgraded to Nvidia propriety driver version 319 {version recommended}. Installed Xscreensaver and then removed it and went back to default screensaver. Done a system update (1st since installing) and now currently running: Linux 3.8.0-32-generic #47~precise1-Ubuntu SMP Wed Oct 2 16:19:35 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux NOTE: Base system was ubuntu 12.04.3 installed from ISO however lsb_release reports "No LSB modules are available" 4.installed psensor. I have check power setting (via Settings) and power setting via dconf-editor and set to recommended settings as described in posts detailing solution to this problem. - I have disabled 1) Nvdia settings at startup and 2) psensor at startup but this does not help. I am using an HP DV7 with 2GB Nvidia card. Not using any fancy graphics features. Recommendations? Thanks.

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