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• How can I achieve strong typing with a component messaging system?

  - by Vaughan Hilts

  I'm looking at implementing a messaging system in my entity component system. I've deduced that I can use an event / queue for passing messages, but right now, I just use a generic object and cast out the data I want. I also considered using a dictionary. I see a lot of information on this, but they all involve a lot of casting and guessing. Is there any way to do this elegantly and keep strong typing on my messages?

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• How can I write byte[] to socket outputstream and specify the end of file?

  - by Christopher Francisco

  I've googled 2 days straight and I can't find how to do this. I have an open stream between client and server, and client will send a JSON string (encrypted to bytes) to the server each 3 to 5 seconds. How can I write to the Socket OutputStream so that I can read each JSON string in the server. I'm guessing I need to specify some kind of end of file or something, but can't find any info on how to achieve this.

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• Can't get spellcheck to work in any program?

  - by Brian John

  I have noticed that spellcheck will work with any program on Ubuntu. For some reason, this stopped working when I purged OpenOffice and replaced it with LibreOffice. I am guessing that I failed to install back a package that provides this spellcheck. All of thee misstakes inn thiss sentencee were NoT caughht. Spell check is vital to me because I am a student and I can not hand in work with mispellings.

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• Is it possible to auto-arrange the active Unity launcher icons?

  - by tijybba

  I am using Ubuntu 12.04 x64 bit as default DE. I was guessing it is possible to Auto Arrange the Current-Active applications in Unity Launcher panel to align in Lastly-Opened or Firstly-Opened in ascending or descending order, irrespective of their locked positions in the Unity Launcher panel. Just to get rid of Scrolling down the launcher panel every time to search active application thereby depriving the need of Alt-Tab shortcut. I mean Alt-Tab alternative in more smarter way, though I also use Alt-Tab for the task Management purpose.

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• Same sitemap submitted for .com and .co.uk domain

  - by Dean

  Not to sure why I did this. But I submitted the same sitemap for our .co.uk and .com domain. Looking to put the .com domain on different hosting and create a new site for international customers using .com domain. Should I remove all urls in google webmasters for the .com domain, guessing this won't have a negative effect on .co.uk stuff and add robot.txt to make sure the .com domain is not crawled? Thanks

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• SQL Server 2008 R2 Reporting Services: A generic error occurred in GDI+

  - by Greg Low

  While building some maps today in SQL Server 2008 R2 Reporting Services, I kept coming up with an error that said: A generic error occurred in GDI+ I was struggling to think what I'd done wrong. After much nashing of teeth and removal of hair, I finally worked out what the error was. When I got to the "Choose Color Scheme and Visualization" page of the map wizard for building a color analytical map, I hadn't picked the correct value for the "Field to Visualize" drop-down. I'm guessing that because...(read more)

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• Sendmail on ubuntu 12.04 64 bit connection times out?

  - by adam

  Okay i get the following error message: to=<[email protected]>, ctladdr=<www-data@adam-linux> (33/33), delay=2+08:20:35, xdelay=00:00:00, mailer=esmtp, pri=25590437, relay=adamziolkowski.com., dsn=4.0.0, stat=Deferred: Connection timed out with adamziolkowski.com. I'm guessing to make sendmail work. I have to change the default outgoing port number to 465 because comcast blocks port 25. Any ideas? What could be causing this error?

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• What is the proper SEO way to add and remove links to our site and sitemap?

  - by ElHaix

  As content fluctuates on our site, we will obviously add the titles to the new pages to our sitemap, and link list for search engine indexing. Through time, certain links will become less relevant, and would like to know how to avoid them being crawled. The links themselves may not be removed - but we don't want to dilute the link list with less relevant links as time passes. I'm guessing the status code of the page would change - to what? Should they also removed from the sitemap?

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• How to diagnose usb issue

  - by alexpotato

  Hey, So my kern.log and syslog files filled up with tons of the below messages: [514971.000109] phy0 - rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x30c4 with error -108. I was curious as to the steps to take, commands to run, places to look to help diagnose this issue (and curious as to what caused it)? I'm guessing it's something usb elated. I had some issues with my printer earlier today so this might be related. Thanks, Alex

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• Slow wireless on Dell XPS 14 ultrabook

  - by GaryBishop

  I've got Ubuntu 12.04 running on this Dell XPS 14 Ultrabook (L421X). Everything is working but my wireless transfer rates are low. I'm getting about 1MB/s download speed on the ultrabook vs 15MB/s on the E6500. If I move into the room with the access point the speed climbs to 15MB/s so I'm guessing it is a signal strength issue but wavemon shows comparable signals to those seen by the E6500. Are there any settings I can tweak in hopes of making it faster?

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• Most efficient 3d depth sorting for isometric 3d in AS3?

  - by AttackingHobo

  I am not using the built in 3d MovieClips, and I am storing the 3d location my way. I have read a few different articles on sorting depths, but most of them seem in efficient. I had a really efficient way to do it in AS2, but it was really hacky, and I am guessing there are more efficient ways that do not rely on possibly unreliable hacks. What is the most efficient way to sort display depths using AS3 with Z depths I already have?

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• What are pros and cons of native checkout for an ecommerce app (mobile)?

  - by Raj

  Looking at some of the ecommerce apps, I am guessing that some use native checkout process, and some use webviews. Would request the community to share some guidelines.. is there a security concern using native checkout ? Are Google Wallet and Paypal checkouts worth trying on native ? This is my first application which deals with money, and I am a little scared. I don't want to use in-app billing some reasons.

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• SQL Server 2008 R2 Reporting Services: A generic error occurred in GDI+

  - by Greg Low

  While building some maps today in SQL Server 2008 R2 Reporting Services, I kept coming up with an error that said: A generic error occurred in GDI+ I was struggling to think what I'd done wrong. After much nashing of teeth and removal of hair, I finally worked out what the error was. When I got to the "Choose Color Scheme and Visualization" page of the map wizard for building a color analytical map, I hadn't picked the correct value for the "Field to Visualize" drop-down. I'm guessing that because...(read more)

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• Does Geany or Gedit provide a browser protocol in the way Textmate does with txmt://?

  - by Rich

  Textmate on the Mac can be bound to the txmt protocol, meaning that development frameworks (such as the Play Framework) can be configured to use this to display error messages. If a stacktrace appears, each line of the stacktrace is a URL of the format (I'm guessing): txmt:///home/myuser/projects/myproject/ProblemFile.java:123 (where 123 is the line number). Clicking this opens the file in Textmate. Is this possible with Gedit, Geany or another programmer's text editor?

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• Object Oriented Design of a Small Java Game

  - by user2733436

  This is the problem i am dealing with. I have to make a simple game of NIM. I am learning java using a book so far i have only coded programs that deal with 2 classes. This program would have about 4 classes i guess including the main class. My problem is i am having a difficult time designing classes how they will interact with each other. I really want to think and use a object oriented approach. So the first thing i did was design the Pile CLASS as it seemed the easiest and made the most sense to me in terms of what methods go in it. Here is what i have got down for the Pile Class so far. package Nim; import java.util.Random; public class Pile { private int initialSize; public Pile(){ } Random rand = new Random(); public void setPile(){ initialSize = (rand.nextInt(100-10)+10); } public void reducePile(int x){ initialSize = initialSize - x; } public int getPile(){ return initialSize; } public boolean hasStick(){ if(initialSize>0){ return true; } else { return false; } } } Now i need help in designing the Player Class. By that i mean i am not asking for anyone to write code for me as that defeats the purpose of learning i was just wondering how would i design the player class and what would go on it. My guess is that the player class would contain method for choosing move for computer and also receiving the move human user makes. Lastly i am guessing in the Game class i am guessing the turns would be handeled. I am really lost right now so i was wondering if someone can help me think through this problem it would be great. Starting with the player class would be appreciated. I know there are some solutions for this problem online but i refuse to look at because i want to develop my own approach to such problems and i am confident if i can get through this problem i can solve other problems. I apologize if this question is a bit poor but in specific i need help in designing the Player class.

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• How to Cut Search Engine Optimization Cost Down For Backlink Building?

  How much do you spend to get your high backlinks? I am guessing a good amount if you are paying a service to do it for you, or if you are buying backlink packets made by other people and paying a monthly fee. You can cut your search engine optimization cost greatly with some easy to use software, and even outsource the work for much cheaper than other SEO services.

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• Looking for wireless product

  - by Belinda

  Can anyone suggest some options for me? I would like to provide our maintenance department with a view-only monitor showing our common Outlook calendars. I'm guessing it would have to have some touch-screen capabilities since they would need to be able to toggle between several calendars. We do have a cobbled together, building wide wireless network. I don't want anything that needs to be "wired or cabled" just plugged into a power source and mounted on the wall.

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• When is a Kernel update due for 11.10?

  - by Mysterio

  Thanks to Phoronix there seems to be a fix for the power regression/overheating bug in the Linux Kernel 3.0.1 bouncing around on the Internet. However this supposed fix which I read has been patched to the Kernel in a testing phase is not newbie-friendly (if you know what I mean). So I am guessing it will be included in the kernel update for 11.10. If it will please when is it due? Linked Question: Kernel patch that solves battery issues when for ubuntu ?

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• Wireless mouse temporarily freezes (sleeps) on battery power

  - by R Pennese

  I have been getting a very annoying problem since recently in Ubuntu 12.04, probably due to another update that did more bad than good... When I resume from sleep on battery power my Lenovo Thinkpad T420, my wireless laser mouse (Logitech M705) freezes everytime I leave it for 2 seconds. It then starts moving again when I shake it for 5 seconds. The touchpad works normally. I'm guessing the mouse enters some sleep mode and I'd like to know where to change this "timeout" value.

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• Scheduled tasks fail to start unless I'm logged in to the server

  - by Chuck

  Tasks need to open a CMD window and pass net use commands, then do a DIR command, pipping the output to a file on the server. Log in as either me (Sysadmin) or with one of the system accounts and task will only run if I'm physically logged into the server. Run as batch file is set in security properties for both users (me and service account), security is granted to all directories, etc. It almost acts like a scheduled task, since it is not physically connected to a display can't create a CMD window and pass the WinID so the command can be sent. I'm guessing. Anyone know of a document that explains how the server handles initiation of a window if done via scheduled task and no attached user is associated with the task? If I log onto the box and run the scheduled tasks they run fine, but produce no errors or event log entries and then just show that it ran successfully and sets the next run time. Have tried both with the run if logged in checkbox on and off and makes no difference. Other tasks work fine, except that they are acting on local drives with no display writing or updating taking place, so I'm guessing the system either can't instantiate a window if no display is connected to a logged on user, or it can't establish a point if it is trying to create a virtual screen. You'd think it is just creating a memory map and then mapping it to a device to display, but that doesn't seem to be the case, but I can find no documentation on how the system handles a scheduled task and how to invoke a fake or virtual screen that it could write to so it appears that a user was connected. Thanks This is driving me nuts and I've tried everything I can think of as well as our network boys ideas and nothing seems to work.

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• Follow cursor location from kile to evince.

  - by D Connors

  I know the title is probably not very clear, so I'll try to be as clear as possible here. I'm running xubuntu on my netbook, and I'm using kile for my latex editing. Since kile is native to kde, I had to manually set it to open pdfs and dvis on evince instead of okular. Now, last time I played around with LaTeX I was using TeXnic center on windows, and it had a very neat feature. Whenever I hit "QuickBuild", not only would it open the output .dvi file, but it would also show me exactly the piece of text I was editing. That is, if I were editing line 13 of the 7th of my document, when I compiled it, the dvi viewer would automatically take me to line 13 on the 7th page of the document, so I wouldn't have to scroll all the way down to it every time I compiled the .tex file. I'm guessing this is a pretty standard feature, and kile probably supports it. But since I don't know what it's called, I'm trying to be clear as to what I'm talking about. Problem is, this feature is not working for me right now, and I'm guessing it's either because evince does not support it, or because I have to manually configure it. Which one is it? And how do I manually configure it, if that's the case?

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• Does the mysql Client API Library version have to match the installed MySQL/Percona server version?

  - by William Jamieson

  I'm running Scientific Linux 6.3 (binary compaible with Redhat/CentOS/etc..) as a LAMP stack. I've installed Percona server and client v5.5 from the Percona yum repository. However when I run phpinfo() I notice that under the MySQL and mysqli sections, it lists the Client API Library version as 5.1.66, and not 5.5x. I'm guessing these need to match, at least to major versions, and I have no idea what the possible consequences of such a mismatch could be. Do I need to revert to Percona server and client v5.1? This is for a production environment so it needs to be right. I'd appreciate any input or experience people could offer. I'm running Scientific Linux 6.3 (binary compaible with Redhat/CentOS/etc..) as a LAMP stack. I've installed Percona server and client v5.5 from the Percona yum repository. However when I run phpinfo() I notice that under the MySQL and mysqli sections, it lists the Client API Library version as 5.1.66, and not 5.5x. I'm guessing these need to match, at least to major versions, and I have no idea what the possible consequences of such a mismatch could be. Do I need to revert to Percona server and client v5.1? This is for a production environment so it needs to be right. I'd appreciate any input or experience people could offer. (Note I will also be cross posting this on the Percona forums)

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• Future Of F# At Jazoon 2011

  - by Alois Kraus

  I was at the Jazoon 2011 in Zurich (Switzerland). It was a really cool event and it had many top notch speaker not only from the Microsoft universe. One of the most interesting talks was from Don Syme with the title: F# Today/F# Tomorrow. He did show how to use F# scripting to browse through open databases/, OData Web Services, Sharepoint, …interactively. It looked really easy with the help of F# Type Providers which is the next big language feature in a future F# version. The object returned by a Type Provider is used to access the data like in usual strongly typed object model. No guessing how the property of an object is called. Intellisense will show it just as you expect. There exists a range of Type Providers for various data sources where the schema of the stored data can somehow be dynamically extracted. Lets use e.g. a free database it would be then let data = DbProvider(http://.....); data the object which contains all data from e.g. a chemical database. It has an elements collection which contains an element which has the properties: Name, AtomicMass, Picture, …. You can browse the object returned by the Type Provider with full Intellisense because the returned object is strongly typed which makes this happen. The same can be achieved of course with code generators that use an input the schema of the input data (OData Web Service, database, Sharepoint, JSON serialized data, …) and spit out the necessary strongly typed objects as an assembly. This does work but has the downside that if the schema of your data source is huge you will quickly run against a wall with traditional code generators since the generated “deserialization” assembly could easily become several hundred MB. *** The following part contains guessing how this exactly work by asking Don two questions **** Q: Can I use Type Providers within C#? D: No. Q: F# is after all a library. I can reference the F# assemblies and use the contained Type Providers? D: F# does annotate the generated types in a special way at runtime which is not a static type that C# could use. The F# type providers seem to use a hybrid approach. At compilation time the Type Provider is instantiated with the url of your input data. The obtained schema information is used by the compiler to generate static types as usual but only for a small subset (the top level classes up to certain nesting level would make sense to me). To make this work you need to access the actual data source at compile time which could be a problem if you want to keep the actual url in a config file. Ok so this explains why it does work at all. But in the demo we did see full intellisense support down to the deepest object level. It looks like if you navigate deeper into the object hierarchy the type provider is instantiated in the background and attach to a true static type the properties determined at run time while you were typing. So this type is not really static at all. It is static if you define as a static type that its properties shows up in intellisense. But since this type information is determined while you are typing and it is not used to generate a true static type and you cannot use these “intellistatic” types from C#. Nonetheless this is a very cool language feature. With the plotting libraries you can generate expressive charts from any datasource within seconds to get quickly an overview of any structured data storage. My favorite programming language C# will not get such features in the near future there is hope. If you restrict yourself to OData sources you can use LINQPad to query any OData enabled data source with LINQ with ease. There you can query Stackoverflow with The output is also nicely rendered which makes it a very good tool to explore OData sources today.

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• OJB Reference Descriptor 1:0 relationship? Should I set auto-retrieve to false?

  - by godzillasdm

  Hi, I am having an issue while using Apache OJB with Spring 2 inside my web app. I'm using OJB reference-descriptor with 2 foreign key properties. I have an object A (parent) and object B (referenced object). The thing is, for an object A, there may or may not be an object B. In the case where there is no object B to go with Object A, the object B seems to be instantiated (through Spring?) anyways. However, I am unable to access object B's members. Whenever I test if Object B == null, it always returns false even though there is no matching value in the database. Since this Object is never null, I figured I can test the object's member like so: if( objectb.getDocumentNumber == null) { return false; } However, I get an exception in the jsp: javax.servlet.jsp.el.ELException: An error occurred while getting property "documentNumber" from an instance class org.sample.pojo.Objectb$$EnhancerByCGLIB$$78022a2 and this exception in the debugger when it's creating the objectB: com.sun.jdi.InvocationException occurred invoking method. I am guessing that the reference-descriptor must be a 1:1+ relationship, instead of a 1:0+ relationship. I was wondering if I should set the property 'auto-retrieve' to false, and then use the PersistenceBroker.retrieveAllReferences(Object obj); method as directed. However, this method's return value is 'void', so I am guessing that Spring somehow creates, and sets the reference class for me. (Returning me back to the same issue I'm having.) I will need a way to test whether the reference object exists first. If not, don't call this retrieveAllReferences method, but I don't see how. Am I going about this all wrong? Does reference-descriptor not allow 1:0 relations? Any work around to my problem? Your suggestions are greatly appreciated!

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• A PHP script to stream internet radio?

  - by Honus Wagner

  I've been searching and searching and I haven't yet come up with a solution to host my own streaming audio player. I'm looking for a way to host an internet radio player that connects to whatever streams I enter in and plays them. I'm not looking to play my MP3s or anything like that. I'm looking to play content from 181.fm or 1Club.fm, for example. I'd even settle for ShoutCast-only streams. I've been to www.wavestreaming.com but it didnt work for me. I'm guessing its because in the very first box where you enter your website url, it leads in for you: http//www. then you fill in the rest. My site is https:// and does not contain a www. in the URL. I'm guessing that has something to do with it. Any links, suggestions for search topics, or even a brief technical overview of what I should be looking into would be greatly appreciated. Thanks for your time.

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