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• Sharing an internet connection through the Ethernet port

  - by Bob Cunningham

  I have a small living room PC (Bohica, running fully-updated Ubuntu 10.10/Maverick) connected to my HDTV that I use for web browsing and media streaming. It connects via WiFi (wlan0) to my Fedora server (Snafu) that in turn connects to the internet. I use static addressing, and everything has been working fine. I just got a Blu-ray player, and I'd like to give it wired network access to the internet via Bohica's available wired ethernet port (eth0). So far, I haven't been to get eth0 and the network configured to get the Blu-ray player talking to the internet. Here's my wlan0 configuration: ip4 addr: 192.168.0.100 mask: /24 (255.255.255.0) gateway: 192.168.0.4 (fedora box) The Blu-ray player is set to an IP of 192.168.0.98/24, with the same gateway as above. I want eth0 set to an IP of 192.168.0.99/24, but when I do this using nm-connection-editor I lose internet access (the system tries to use eth0 as the default internet access interface). How do I get my blu-ray player to talk to the internet through Bohica, and do so without disrupting my current (working) network? Thanks. Edit: Here's the relevant output from nm-tool with the Blu-ray player connected: $ nm-tool NetworkManager Tool State: connected - Device: eth0 Type: Wired Driver: forcedeth State: disconnected Default: no HW Address: 90:FB:A6:2C:94:32 Capabilities: Carrier Detect: yes Speed: 100 Mb/s Wired Properties Carrier: on - Device: wlan0 [wlan0] Type: 802.11 WiFi Driver: ndiswrapper State: connected Default: yes HW Address: 00:26:5A:C0:D0:05 IPv4 Settings: Address: 192.168.0.100 Prefix: 24 (255.255.255.0) Gateway: 192.168.0.4

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• Installing Ubuntu along with windows 7 on shrunk partition

  - by Thabo

  I am new to Ubuntu OS and ask Ubuntu community. First this is not a duplicate question. Actually this a question which is a summery of all solutions and questions were posted in this community, related to Install Ubuntu along with Windows 7. I have bought a new Hp laptop with its original windows 7.I want to install Ubuntu along with windows 7 64 bit. I ran the Ubuntu 12.4 Desktop installation CD. But Ubuntu installer doesn't show the "along with windows 7 option"only it is showing two options. I read some questions and answers posted on this community. Specially following link Ubuntu 12.04 does not see windows already install on my computer (dual installation) I tried following thinks, I ran the terminal in live CD and tried sudo dmraid -rE command and dmraid remove command .But terminals says there is no dmraid partitions. So I tried another scenario checked my partitions with g parted.There are some partitions labeled C,HP tools,Recovery and System. C is containing windows 7 Files. So I shrank the volume of C Drive. Now I have 50000Mb of unallocated disk. I tried with Gparted to create a partition on that allocated space.It says some thing that you can't create more than four primary partition.Of course all other four partitions were created on widows are actually type of primary partition. So I went back to Windows 7 and tried to create a new volume on unallocated space.But unfortunately it says,If i create a new volume it will be the type of Dynamic partition.It says we cant boot another OS from that partition. So i cancelled that step. Now i have 50000Mb unallocated space but how can i install Ubuntu on that partition without harming the existing Windows 7? Because still I have only two options: Erase and install Ubuntu. Try something else. (I can see my unallocated space by going to "something else" option.)

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• How does a game developer get feedback from gamers (not developers) or start a forum community without paying for advertising or hiring Q&A teams?

  - by Carter81

  I am familiar with a lot of game developer forums, but I'd assume this is much less likely to attract more casual commentators. I also fear that feedback from a gamer's perspective would often be tainted by their game dev perspective. For example, if I were making a RTS game and wanted to get feedback from "The RTS gamers" where would I go? Is there a general idea of what type of website or forum to go to? Do you go to specific game websites, to try to "steal" attention? Would this not equate to spam or inappropriate posting? What is considered appropriate and inappropriate? I am not asking for specifics. I am asking how one "starts a community", or how one "gets feedback from gamers" without resorting to spamming forums or 'advertising' just to see what sticks. What TYPE OF PLACE does one go? Are there already sites designed for this purpose? I tried going to what was once a very popular forum for feedback from what I believed was a niche hardcore group of gamers in the genre, but its popularity seemed to have died significantly; Leaving only trolls and very young teenagers. The resulting feedback was quite disappointing, mainly for how little feedback it resulted. Many years ago, feedback would flood in by the hundreds so quickly. Without this website, I am at a loss as to where to go to see what people think of ideas, gather feedback from a gamer's perspective (not a developer's perspective), or where to pull from to start my own site's forum. I am out of ideas of what to do, short of going to various game forums to post in the off-topic sections there.

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• Finding the shorter turning direction towards a target

  - by A.B.

  I'm trying to implement a type of movement where the object gradually faces the target. The problem I've run into is figuring out which turning direction is faster. The following code works until the object's orientation crosses the -PI or PI threshold, at which point it will start turning into the opposite direction void moveToPoint(sf::Vector2f destination) { if (destination == position) return; auto distance = distanceBetweenPoints(position, destination); auto direction = angleBetweenPoints(position, destination); /// Decides whether incrementing or decrementing orientation is faster /// the next line is the problem if (atan2(sin(direction - rotation), cos(direction - rotation)) > 0 ) { /// Increment rotation rotation += rotation_speed; } else { /// Decrement rotation rotation -= rotation_speed; } if (distance < movement_speed) { position = destination; } else { position.x = position.x + movement_speed*cos(rotation); position.y = position.y + movement_speed*sin(rotation); } updateGraphics(); } 'rotation' and 'rotation_speed' are implemented as custom data type for radians which cannot have values lower than -PI and greater than PI. Any excess or deficit "wraps around". For example, -3.2 becomes ~3.08.

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• Java Champion Dick Wall Explores the Virtues of Scala (otn interview)

  - by Janice J. Heiss

  In a new interview up on otn/java, titled “Java Champion Dick Wall on the Virtues of Scala (Part 2),” Dick Wall explains why, after a long career in programming exploring Lisp, C, C++, Python, and Java, he has finally settled on Scala as his language of choice. From the interview: “I was always on the lookout for a language that would give me both Python-like productivity and simplicity for just writing something and quickly having it work and that also offers strong performance, toolability, and type safety (all of which I like in Java). Scala is simply the first language that offers all those features in a package that suits me. Programming in Scala feels like programming in Python (if you can think it, you can do it), but with the benefit of having a compiler looking over your shoulder and telling you that you have the wrong type here or the wrong method name there.The final ‘aha!’ moment came about a year and a half ago. I had a quick task to complete, and I started writing it in Python (as I have for many years) but then realized that I could probably write it just as fast in Scala. I tried, and indeed I managed to write it just about as fast.”Wall makes the remarkable claim that once Java developers have learned to work in Scala, when they work on large projects, they typically find themselves more productive than they are in Java. “Of course,” he points out, “people are always going to argue about these claims, but I can put my hand over my heart and say that I am much more productive in Scala than I was in Java, and I see no reason why the many people I know using Scala wouldn’t say the same without some reason.”Read the interview here.

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• Working with Reporting Services Filters–Part 5: OR Logic

  - by smisner

  When you combine multiple filters, Reporting Services uses AND logic. Once upon a time, there was actually a drop-down list for selecting AND or OR between filters which was very confusing to people because often it was grayed out. Now that selection is gone, but no matter. It wouldn’t help us solve the problem that I want to describe today. As with many problems, Reporting Services gives us more than one way to apply OR logic in a filter. If I want a filter to include this value OR that value for the same field, one approach is to set up the filter is to use the IN operator as I explained in Part 1 of this series. But what if I want to base the filter on two different fields? I  need a different solution. Using the AdventureWorksDW2008R2 database, I have a report that lists product sales: Let’s say that I want to filter this report to show only products that are Bikes (a category) OR products for which sales were greater than $1,000 in a year. If I set up the filter like this: Expression Data Type Operator Value [Category] Text = Bikes [SalesAmount]   > 1000 Then AND logic is used which means that both conditions must be true. That’s not the result I want. Instead, I need to set up the filter like this: Expression Data Type Operator Value =Fields!EnglishProductCategoryName.Value = "Bikes" OR Fields!SalesAmount.Value > 1000 Boolean = =True The OR logic needs to be part of the expression so that it can return a Boolean value that we test against the Value. Notice that I have used =True rather than True for the value. The filtered report appears below. Any non-bike product appears only if the total sales exceed $1,000, whereas Bikes appear regardless of sales. (You can’t see it in this screenshot, but Mountain-400-W Silver, 38 has sales of $923 in 2007 but gets included because it is in the Bikes category.)

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• Flow Fields in Dynamics NAV

  - by T

  I don’t know the exact business reason but someone asked how to identify all sales shipping orders with any negative quantities on them.  They needed to print these separately from the shipments that only have all positive quantities. Here is one way to solve this problem In NAV, open Sales Shipment Header Add a field of type Boolean (The field type should match the value you expect to return from the flow field method.  In this case we will use an exist so we expect a bool but we could have used a Sum, Average, Min, Max, Count, or a Lookup to return a value). Define it as a flow field and click on the ellipse next to CalcFormula Now [Has Negative Qty] is false if no negatives exist And [Has Negative Qty] and true if a negative exist So it is ready to be used as a filter on the report. Don’t forget that if you are using it in code, you may need to CalcFields. Hope that helps.  If you really can’t afford the field in your header, you can use code to check the lines for a negative value each time and use a skip or break function to skip that header record but it seems expensive to check them all if you only want a few to print. Please let me know if you think of a better solution.

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• Validate that a Checkbox is checked using javascript

  - by H(at)Ni

  I was facing a challenge yesterday that I was creating a Visual webpart and I wanted to validate the a submit button is only visible if the user checked a "I agree to terms" checkbox. Something was weired that I tested my code on a normal asp.net website and it worked perfectly while it had a different behaviour inside the webpart which is whenever I check the checkbox, the button is enabled but it will not fire the asp.net validators in client side. It posts back the page and then the validators appear after that. So, I tried to change my type of thinking and I reached a different solution is that to call a javascript function whenever the button is clicked and then check if the checkbox is clicked or not. To illustrate more, here are an example to what I'm saying: 1. Button in aspx page: <asp:Button OnClientClick="CheckForCondition();"  ValidationGroup="CompaniesSection" ID="btnCompaniesSubmit"                         runat="server" Text="Submit" /> 2. CheckForCondition() function: <script language="javascript" type="text/javascript">                         function CheckForCondition() {                             if ($jq('#<%= ChkCompanyCheck.ClientID %>:checked').val() == undefined) {                                 $jq('#lblCheckBox').show();                                 return false;                             }                             else {                                 $jq('#lblCheckBox').hide();                                 return true;                             }                         }                      </script> 3. lblCheckBox is simply a label that shows a red asterisk beside the checkbox to indicate that it's a required field. <label id="lblCheckBox" style="color:Red;display:none">*</label>

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• How can I pass an external instance to the constructor of an object that's being created using the default XNA XML content loader?

  - by Michael

  I'm trying to understand how to use the XNA XML content importer to instantiate non-trivial objects that are more than a collection of basic properties (e.g., a class that inherits from DrawableGameObject or GameObject and requires other things to be passed into its constructor). Is it possible to pass existing external instances (e.g., an instance of the current Game) to the constructor of an object that's being created using the default XNA XML content loader? For example, imagine that I have the following class, inheriting from DrawableGameComponent: public class Character : DrawableGameComponent { public string Name { get; set; } public Character(Game game) : base(game) { } public override void Update(GameTime gameTime) { } public override void Draw(GameTime gameTime) { } } If I had a simple class that did not need other parameters in its constructor (i.e., the Game instance), then I could simply use this XML: <XnaContent> <Asset Type="MyNamespace.Character"> <Name>John Doe</Name> </Asset> </XnaContent> ...and then create an instance of Character using this code: var character = Content.Load<Character>("MyXmlAssetName"); But that won't work because I need to pass the need to pass the Game into the constructor. What's the best way to handle this situation? Is there a way to pass in things like the current Game using the default XNA XML content loader? Do I need to write my own XML loader? (If so, how?) Is there a better object-oriented design that I should be using for my classes? Note: Although I used Game in this example, I'm really just asking how to pass any type of existing instance to my constructors. (For example, I'm using the Farseer Physics Engine, and some of my classes also need a reference to the Farseer World object too.) Thanks in advance.

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• What's the best way to manage error logging for exceptions?

  - by Peter Boughton

  Introduction If an error occurs on a website or system, it is of course useful to log it, and show the user a polite message with a reference code for the error. And if you have lots of systems, you don't want this information dotted around - it is good to have a single centralised place for it. At the simplest level, all that's needed is an incrementing id and a serialized dump of the error details. (And possibly the "centralised place" being an email inbox.) At the other end of the spectrum is perhaps a fully normalised database that also allows you to press a button and see a graph of errors per day, or identifying what the most common type of error on system X is, whether server A has more database connection errors than server B, and so on. What I'm referring to here is logging code-level errors/exceptions by a remote system - not "human-based" issue tracking, such as done with Jira,Trac,etc. Questions I'm looking for thoughts from developers who have used this type of system, specifically with regards to: What are essential features you couldn't do without? What are good to have features that really save you time? What features might seem a good idea, but aren't actually that useful? For example, I'd say a "show duplicates" function that identifies multiple occurrence of an error (without worrying about 'unimportant' details that might differ) is pretty essential. A button to "create an issue in [Jira/etc] for this error" sounds like a good time-saver. Just to re-iterate, what I'm after is practical experiences from people that have used such systems, preferably backed-up with why a feature is awesome/terrible. (If you're going to theorise anyway, at the very least mark your answer as such.)

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• Stylecop 4.7.37.0 has been released

  - by TATWORTH

  Stylecop  4.7.37.0 has been released at http://stylecop.codeplex.com/releases/view/79972The release notes follow:Add docs for new SA1650 spelling rule.Fix for 7395. Dont remove parenthesis around await expressions.Insert a returns element into docs within a see element.Update our tools folder StyleCop dll'sfix for 7392. Insert generic type docs for return types correctly.Fix for 7393. Allow documentation elements with attributes to end the string and still be valid.Make sure the MSBuild Task logs the warning id and type of exception. Unless the description field holds all this info VS cannot show the text in the Error List.Load custom dictionaries for multiple cultures. For a culture like en-GB; we load CustomDictionary.xml, then look for CustomDictionary.en-GB.xml and then CustomDictionary.en.xmlUpdate standard shipping dictionaries.Element documentation spelling fixes.Reduce the standard dictionaryUpdate our own devbuild StyleCop checks.Don't check spelling of xml documentation attributes are anything inside  <c> or <code> elements.Update StylingStyling update.Add timestamps for all the dependant files into the StyleCopResults.cache. Add a FileSystemWatcher to all custom dictionary files.Write out the full violation into the StyleCopResults.cache.Change a rules description text.Styling fixes.Styling fixes.NEW RULE: Check Spelling Of Element Documetation. Fix over 2000 spelling errors in our source code. Update the VS addin to show the rule violation in more detail. Add spelling checker to the deployment.Set our own Culture to en-USDocumentation spelling fixes.First draft of the documentation spelling checker.Fix for 7325. Don't throw 1126 in goto statements.Fix for 7090. Add TargetsDir to registry during install.Fix for 7060. Sort usings after moving them inside namespace.Fix FxCop issues.Fix for 7389. Detect CpuCount on Unix/MACFix for 6788. Allow opening curly brackets for scope. Added new tests.Updating constants.Fix for 7167. Show version number of StyleCop in VS Help window.Only output StyleCop excluded files if there are any.

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• BI Publisher : Formatting Issues

  - by Manoj Madhusoodanan

  While creating BI Publisher reports the formatting issues are quite common.Here I am discussing some common issues related to BIP report development. 1) First issue is related to column formatting.When you want to display some data which has leading zeros or trailing zeros after '.' in EXCEL output you will not get the desired output.But in PDF it will come as what you are expecting.This is not with the issue of your data. This is due to the unique nature of EXCEL cell format.When you are trying to put a text data in a cell with out making any change to cell format it will treat as number and it will truncate all leading zeros and all trailing zeros after '.' . So what you have to do is to convert that data into a format which EXCEL can treat as text. Eg: If you want to display 0020100 convert this data into ="0020100". Same way for 23789.02300 to ="23789.02300".   Note: This is applicable to EXCEL output only.If you have multiple output type apply it only for EXCEL. 2) Second is related to report size issue in PDF output type.If the number of columns are more and if you want to show most of the columns in one row andif it is a PDF output you can choose the paper size as Legal (8.5 x 14''). You will get more spaces in the template to accommodate more columns. 3) If your XML data contains special characters like &,<,> etc ..  pass the data to DBMS_XMLGEN.CONVERT function.It will replace special characters with corresponding XML notations. Eg: (a>b) & (c!=d) to  (a&gt;b) &amp; (c!=d)

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• How can I remove duplicate icons for "launched" java programs in the launcher?

  - by Tim

  When launching java programs (like IntelliJ IDEA and Crashplan) in Natty's Unity launcher, duplicate icons are shown (see image). For IntelliJ I created the .desktop file, for Crashplan the .desktop file is supplied with the application. Is there something that can be changed in the .desktop files (or somewhere else) that can prevent this from occurring? I couldn't find a bug report for unity itself but programs like Gnome-Do/Docky have bug reports and had to make internal changes to their applications to prevent this. In this image the 1st icon is the one created from the .desktop file and the second icon is after launching it. Second icon disappears when closing the application. Custom IntelliJ .desktop file #!/usr/bin/env xdg-open [Desktop Entry] Version=1.0 Type=Application Terminal=false Icon[en_US]=/opt/idea/bin/idea128.png Name[en_US]=IntelliJ IDEA Exec=/opt/idea/bin/idea.sh Name=IntelliJ IDEA Icon=/opt/idea/bin/idea128.png StartupNotify=true Crashplan provide .desktop file [Desktop Entry] Version=1.0 Encoding=UTF-8 Name=CrashPlan Categories=; Comment=CrashPlan Desktop UI Comment[en_CA]=CrashPlan Desktop UI Exec=/usr/local/crashplan/bin/CrashPlanDesktop Icon=/usr/local/crashplan/skin/icon_app_64x64.png Hidden=false Terminal=false Type=Application GenericName[en_CA]=

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• Visual WebGui launches a new prize-winning challenge for developers

  - by Webgui

  Gizmox is announcing a ListView Challenge where developers can participate by creating and submitting their own implementations of the new extended ListView. "its quite amazing what you can do with it. It opens a lot of new ways to present data in a better and more userfriendly way," says one of the VWG community members who built a three level hierarchal ListView. Watch the hierarchal ListView demo by Visualizer Those ListView implementations will be reviewed and rated and the winner will win a free Professional Studio license $750 worth. The 5 top rated codes will entitle their developers for a cool new T-shirt. The new v6.4 introduces new capabilities with its extended ListView Control. Enter the Challenge The Collapsible Panel enhancement of the ListView Control, along with the Column Type Control, open up the possibilities for potential usage of the ListView control for data display, data entry and as the Collapsible Panel can contain whatever control you like, it can as well contain other ListView controls, thus making it possible to create Hierarchial ListView display of unlimited number of levels. The first enhancement is the introduction of a new column type Control which opens up the possibility for a ListView cell to contain controls like CheckBox, ComboBox, ListBox or even TabControl, Form or another ListView as the contents of that particular cell. This means that the ListView is no longer a display-only control, but has the full potential of being a full blown data entry control as well. The second major enhancement is the introduction of ListViewPanelItem. The ListViewPanelItem behaves exactly the same as it‘s predecessor, the ListViewItem, and in additon it has a Panel Control attached to it, seperate panel for each row in the ListView. This new Panel can be either expanded (visible) or not (hidden) and when expanded, will fill the full width of the ListView, but has adjustable height. Watch a webcast about the extended ListView

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• Should I stay in my degree or take an opportunity for management experience?

  - by Adam

  I've read a couple other post along these lines and they've been helpful but I'm wondering if my case is any different. I've been working towards my CS degree while working part time in a programming job. I'm now about two years away from getting my degree and was just offered a management position at my job. This would mean that I have to work full-time at my job and I can't really work towards my degree anymore in person. My school doesn't really offer CS classes after hours nor online. It seems that getting a degree is very important from the other post that I read. Does having management experience trump that? I'm currently leaning towards taking the job and finding some sort of online degree. Also my school only offers a business degree online, could I just get this in place. Does the type of degree really matter? For some jobs it's not the type of degree just that you have one, is there any merit for this in the programming industry? Thanks :)

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• Ubuntu 12.04 slow boot on ASUS, attached with dmesg and bootchart

  - by stanleyhunk

  I heard that Ubuntu can boot up around 30sec, but I take more than 60sec every time my Ubuntu boot. I also read some forum said need to post the dmesg and bootchart to identify which process slowing down the booting time, as I'm not expert in Ubuntu and wish to learn more about it, I humbly ask any pro here to teach me how. My laptop specs: Model : ASUS K45VS RAM : 8MB CPU : Intel(R) Core(TM) i7-3630QM CPU @ 2.40GHz x 8 Graphic Card : nVidia GeForce GT 645M HDD : 750GB OS : Single boot Ubuntu 12.04LTS System.uname : Linux 3.8.0-39-generic #58~precise1-Ubuntu SMP Fri May 2 21:33:40 UTC 2014 x86_64 System.release : Ubuntu 12.04.4 LTS System.kernel.options : BOOT_IMAGE=/boot/vmlinuz-3.8.0-39-generic root=UUID=c8a71503-bce8-406c-9a5f-5aa8284f5c7c ro quiet splash My dmesg (which highlighted to the huge time frame gap): [ 30.772656] cgroup: libvirtd (1961) created nested cgroup for controller "memory" which has incomplete hierarchy support. Nested cgroups may change behavior in the future. [ 30.772659] cgroup: "memory" requires setting use_hierarchy to 1 on the root. [ 30.772683] cgroup: libvirtd (1961) created nested cgroup for controller "devices" which has incomplete hierarchy support. Nested cgroups may change behavior in the future. [ 30.772710] cgroup: libvirtd (1961) created nested cgroup for controller "blkio" which has incomplete hierarchy support. Nested cgroups may change behavior in the future. [ 32.140335] nvidia 0000:01:00.0: irq 46 for MSI/MSI-X [ 32.505619] ACPI Error: Field [TMPB] at 1081344 exceeds Buffer [ROM1] size 262144 (bits) (20121018/dsopcode-236) [ 32.505624] ACPI Error: Method parse/execution failed [\_SB_.PCI0.PEG0.PEGP._ROM] (Node ffff880224e91f00), AE_AML_BUFFER_LIMIT (20121018/psparse-537) [ 802.034422] audit_printk_skb: 69 callbacks suppressed [ 802.034428] type=1400 audit(1400914804.392:35): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1683 comm="cupsd" pid=1683 comm="cupsd" capability=36 capname="block_suspend" [ 1581.300901] type=1400 audit(1400915584.816:36): apparmor="DENIED" operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1683 comm="cupsd" pid=1683 comm="cupsd" capability=36 capname="block_suspend" My Bootchart.png: Looking forward to learn to improve both my booting time and knowledge. Thanks in advance :)

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• Installing 13.04 on an EFI partition - Share with Windows 8?

  - by mengelkoch

  Information I've found here suggests that for my system, I need to install 13.04 into an EFI-type partition, since it needs to boot as UEFI. I also understand it is advisable to have only ONE EFI partition on the disk; I've read here that it is OK for Ubuntu and Windows to share the same partition (please confirm). When I try to install into the existing EFI drive, I get the message "No root file system is defined. Please correct from partitioning menu." Do I change the EFI boot partition to another type? Doesn't that defeat the purpose? If I change it to Ext4 Journaling File System, I am given the opportunity to define the '/' Mount point. I haven't proceeded beyond this point for fear I am going to destroy Windows 8 by altering this partition. BTW, I created three partitions in Windows before installing, per the helpful response to my previous question. But if I try to install into the partition I created for Ubuntu, I get the "No root file system..." error again.

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• Scrolling though objects then creating a new instace of this object

  - by gopgop

  In my game when pressing the right mouse button you will place an object on the ground. all objects have the same super class (GameObject). I have a field called selected and will be equal to one certain gameobject at a time. when clicking the right mouse button it checks whats the instance of selected and that how it determines which object to place on the ground. code exapmle: t is the "slot" for which the object will go to. if (selected instanceof MapleTree) { t = new MapleTree(game,highLight); } else if (selected instanceof OakTree) { t = new OakTree(game,highLight); } Now it has to be a "new" instance of the object. Eventually my game will have hundreds of GameObjects and I don't want to have a huge if else statement. How would I make it so it scrolls though the possible kinds of objects and if its the correct type then create a new instance of it...? When pressing E it will switch the type of selected and is an if else statement as well. How would I do it for this too? here is a code example: if (selected instanceof MapleTree) { selected = new OakTree(game); } else if (selected instanceof OakTree) { selected = new MapleTree(game); }

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• QapTcha error issue. Works locally, not on live server [migrated]

  - by BlassFemur

  I am adding QapTcha (http://demos.myjqueryplugins.com/qaptcha/) to a website that I am working on and I'm getting the error "Uncaught TypeError: Cannot read property 'error' of null". What's weird to me is everything is working perfectly locally. No errors or anything. Once I uploaded via ftp to the live server, I get the above error. Below is the block of code that seems to be generating the error: Slider.draggable({ revert: function(){ if(opts.autoRevert) { if(parseInt(Slider.css("left")) (bgSlider.width()-Slider.width()-10)) return false; else return true; } }, containment: bgSlider, axis:'x', stop: function(event,ui){ if(ui.position.left (bgSlider.width()-Slider.width()-10)) { // set the SESSION iQaptcha in PHP file $.post(opts.PHPfile,{ action : 'qaptcha', qaptcha_key : inputQapTcha.attr('name') }, function(data) { if(!data.error) Uncaught TypeError: Cannot read property 'error' of null { Slider.draggable('disable').css('cursor','default'); inputQapTcha.val(''); TxtStatus.text(opts.txtUnlock).addClass('dropSuccess').removeClass('dropError'); form.find('input[type=\'submit\']').removeAttr('disabled'); if(opts.autoSubmit) form.find('input[type=\'submit\']').trigger('click'); } },'json'); } } }); I'm not really sure what's going on as to why it works locally and not on the server. Any help/ suggestions would be appreciated. Thanks

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• Limiting calls to WCF services from BizTalk

  - by IntegrationOverload

  ** WORK IN PROGRESS ** This is just a placeholder for the full article that is in progress. The problem My BTS solution was receiving thousands of messages at once. After processing by BTS I needed to send them on via one of several WCF services depending on the message content. The problem is that due to the asynchronous nature of BizTalk the WCF services were getting hammered and could not cope with the load. Note: It is possible to limit the SOAP calls in the BtsNtSvc.exe.Config file but that does not have the desired results for Net-TCP WCF services. The solution So I created a new MessageType for the messages in question and posted them to the BTS messaeg box. This schema included the URL they were being sent to as a promoted property. I then subscribed to the message type from a new orchestraton (that does just the WCF send) using the URL as a correlation ID. This created a singleton orchestraton that was instantiated when the first message hit the message box. It then waits for further messages with the same correlation ID and type and processs them one at a time using a loop shape with a timer (A pretty standard pattern for processing related messages) Image to go here This limits the number of calls to the individual WCF services to 1. Which is a good start but the service can handle more than that and I didn't want to create a bottleneck. So I then constructed the Correlation ID using the URL concatinated with a random number between 1 and 10. This makes 10 possible correlation IDs per URL and so 10 instances of the singleton Orchestration per WCF service. Just what I needed and the upper random number is a configuration value in SSO so I can change the maximum connections without touching the code.

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• Is Akka a good solution for a concurrent pipeline/workflow problem?

  - by herpylderp

  Disclaimer: I am brand new to Akka and the concept of Actors/Event-Driven Architectures in general. I have to implement a fairly complex problem where users can configure a "concurrent pipeline": Pipeline: consists of 1+ Stages; all Stages execute sequentially Stage: consists of 1+ Tasks; all Tasks execute in parallel Task: essentially a Java Runnable As you can see above, a Task is a Runnable that does some unit of work. Tasks are organized into Stages, which execute their Tasks in parallel. Stages are organized into the Pipeline, which executes its Stages sequentially. Hence if a user specifies the following Pipeline: CrossTheRoadSafelyPipeline Stage 1: Look Left Task 1: Turn your head to the left and look for cars Task 2: Listen for cars Stage 2: Look right Task 1: Turn your head to the right and look for cars Task 2: Listen for cars Then, Stage 1 will execute, and then Stage 2 will execute. However, while each Stage is executing, it's individual Tasks are executing in parallel/at the same time. In reality Pipelines will become very complicated, and with hundreds of Stages, dozens of Tasks per Stage (again, executing at the same time). To implement this Pipeline I can only think of several solutions: ESB/Apache Camel Guava Event Bus Java 5 Concurrency Actors/Akka Camel doesn't seem right because its core competency is integration not synchrony and orchestration across worker threads. Guava is great, but this doesn't really feel like a subscriber/publisher-type of problem. And Java 5 Concurrency (ExecutorService, etc.) just feels too low-level and painful. So I ask: is Akka a strong candidate for this type of problem? If so, how? If not, then why, and what is a good candidate?

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• Why will Screenshot not show up in Dash?

  - by Bruce

  I'm relatively new to Ubuntu, and am running into a problem I've not seen before. This is on an Ubuntu 12.04 system. I can't find Screenshot. I'm trying to take a shot of a screen from a web page, go to Dash, type in Screenshot, and nothing shows up. I've done this many times before, but suddenly Screenshot is not found. I downloaded an app called Shutter, it seems to have installed just fine, but like Screenshot, I don't know how to find it. Dash reveals nothing. In Dash, I've noticed that I have no applications showing up in response to a search. For instance, I can type Firefox, and get no results either, even though I'm using Firefox to submit this question. Is there something I can do to get Dash to show applications? Search results show only files and folders, and downloads. I did find one answer on Ask Ubuntu, which gave the following instructions: None of these fixes worked for me. But after more searching: rm ~/.cache/software-center -R worked like a charm. I did need to run: unity --reset & afterwards though, for the changes to take effect within dash, but the software center just started working straightaway. However, when I issued the unity --reset & command, it resulted in an internal error, and I'll have to reboot in order to reset my computer (which fortunately is allowing me to complete this question). So I'm still wondering why applications won't show in Dash, and will appreciate any help.

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• Using VirtualBox to test drive Windows Blue

  - by Fat Bloke

  Oracle VM VirtualBox is great for trying out the latest and greatest technologies and platforms. So when Microsoft recently announced the Developer Preview for Windows Server 2012 R2 and Windows 8.1,  it was with eager anticipation that FatBloke ran to the TechNet Evaluation Center to download the isos. Once downloaded,  a new VM in VirtualBox Manager was created that used Windows 2012 (64-bit) OS type and all the defaults were selected. And on starting the VM, and pointing to the iso file to install from, the excitement rose as we saw a cool new splashscreen image: But suddenly our hopes are dashed.... It would seem that this platform requires an instruction (CMPXCHG16B) that VirtualBox doesn't offer "out-of-the-box".  Fear not, for the VirtualBox team knew that this day would finally arrive and have prepared an "in case of emergency" switch as follows: Power off the vm; At the command line type:  VBoxManage setextradata [vmname] VBoxInternal/CPUM/CMPXCHG16B 1 Start the VM and install Windows Server 2012 R2 This will be enabled by default in a future release, but geeks can't wait, hence this blog. Enjoy! -FB 

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• Understanding Application binary interface (ABI)

  - by Tim

  I am trying to understand the concept of Application binary interface (ABI). From The Linux Kernel Primer: An ABI is a set of conventions that allows a linker to combine separately compiled modules into one unit without recompilation, such as calling conventions, machine interface, and operating-system interface. Among other things, an ABI defines the binary interface between these units. ... The benefits of conforming to an ABI are that it allows linking object files compiled by different compilers. From Wikipedia: an application binary interface (ABI) describes the low-level interface between an application (or any type of) program and the operating system or another application. ABIs cover details such as data type, size, and alignment; the calling convention, which controls how functions' arguments are passed and return values retrieved; the system call numbers and how an application should make system calls to the operating system; and in the case of a complete operating system ABI, the binary format of object files, program libraries and so on. I was wondering whether ABI depends on both the instruction set and the OS. Are the two all that ABI depends on? What kinds of role does ABI play in different stages of compilation: preprocessing, conversion of code from C to Assembly, conversion of code from Assembly to Machine code, and linking? From the first quote above, it seems to me that ABI is needed for only linking stage, not the other stages. Is it correct? When is ABI needed to be considered? Is ABI needed to be considered during programming in C, Assembly or other languages? If yes, how are ABI and API different? Or is it only for linker or compiler? Is ABI specified for/in machine code, Assembly language, and/or of C?

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• implementing dynamic query handler on historical data

  - by user2390183

  EDIT : Refined question to focus on the core issue Context: I have historical data about property (house) sales collected from various sources in a centralized/cloud data source (assume info collection is handled by a third party) Planning to develop an application to query and retrieve data from this centralized data source Example Queries: Simple : for given XYZ post code, what is average house price for 3 bed room house? Complex: What is estimated price for an house at "DD,Some Street,XYZ Post Code" (worked out from average values of historic data filtered by various characteristics of the house: house post code, no of bed rooms, total area, and other deeper insights like house building type, year of built, features)? In addition to average price, the application should support other property info ** maximum, or minimum price..etc and trend (graph) on a selected property attribute over a period of time**. Hence, the queries should not enforce the search based on a primary key or few fixed fields In other words, queries can be What is the change in 3 Bed Room house price (irrespective of location) over last 30 days? What kind of properties we can get for X price (irrespective of location or house type) The challenge I have is identifying the domain (BI/ Data Analytical or DB Design or DB Query Interface or DW related or something else) this problem (dynamic query on historic data) belong to, so that I can do further exploration My findings so far I could be wrong on the following, so please correct me if you think so I briefly read about BI/Data Analytics - I think it is heavy weight solution for my problem and has scalability issues. DB Design - As I understand RDBMS works well if you know Data model at design time. I am expecting attributes about property or other entity (user) that am going to bring in, would evolve quickly. hence maintenance would be an issue. As I am going to have multiple users executing query at same time, performance would be a bottleneck Other options like Graph DB (http://www.tinkerpop.com/) seems to be bit complex (they are good. but using those tools meant for generic purpose, make me think like assembly programming to solve my problem ) BigData related solution are to analyse data from multiple unrelated domains So, Any suggestion on the space this problem fit in ? (Especially if you have design/implementation experience of back-end for property listing or similar portals)

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