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Articles indexed in November 2011

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• Can you recommend a game server for a facebook board game?

  - by Yekmer Simsek

  I am seeking a game server that will scale well. All commercial and/or free software alternatives are welcome. Game will be a boardgame that is similar to poker. Some technical details are listed below. There will be a table which consists of 4 people, to send them message I need a channel manager. A table will be ready to play for at least 5 minutes. There should be a reliable channel manager. People will wait for some time(i.e.) and if they are not playing they will be kicked by server, so there will be a reliable timed task queue to execute some tasks. It should be quick enough to response and show the changes to all 4 people on that table simultaneously.To achive this server should have a powerfull I/O library. I think to use inmemory to have quick response times, but it comes with scalability problems. And some variables should be thread safe so a variable should be thread safe between multiple nodes. Flash(AS3) and Unity (.Net 2.0 C# mono) client API's should be available for socket connection. PS: I am using Reddwarf server, it lacks of documentation and multiple node.

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• Best platform for android and ios game?

  - by LoveMeSomeCode

  Ok, this has been asked before, but not recently, and most of the answers were just 'buy a mac'. So we're a couple guys who've been making small flash games, and now we want to go mobile, and there seem to be lots of options. Does anyone here have experience with one or more of these platforms to tell us the pros and cons of each? Corona AIR 3 Rhodes Could someone with experience compare and contrast these to each other and native development? We want to cast the widest net with the least re-work so we'd like to target just Android and iPhone, and we'd like it to be an actual app in the market instead of just a mobile website. We have experience in Actionscript, Javascript, and C#.

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• Image first loaded, then it isn't? (XNA)

  - by M0rgenstern

  I am very confused at the Moment. I have the following Class: (Just a part of the class): public class GUIWindow { #region Static Fields //The standard image for windows. public static IngameImage StandardBackgroundImage; #endregion } IngameImage is just one of my own classes, but actually it contains a Texture2D (and some other things). In another class I load a list of GUIButtons by deserializing a XML file. public static GUI Initializazion(string pXMLPath, ContentManager pConMan) { GUI myGUI = pConMan.Load<GUI>(pXMLPath); GUIWindow.StandardBackgroundImage = new IngameImage(pConMan.Load<Texture2D>(myGUI.WindowStandardBackgroundImagePath), Vector2.Zero, 1024, 600, 1, 0, Color.White, 1.0f, true, false, false); System.Console.WriteLine("Image loaded? " + (GUIWindow.StandardBackgroundImage.ImageStrip != null)); myGUI.Windows = pConMan.Load<List<GUIWindow>>(myGUI.GUIFormatXMLPath); System.Console.WriteLine("Windows loaded"); return myGUI; } Here this line: System.Console.WriteLine("Image loaded? " + (GUIWindow.StandardBackgroundImage.ImageStrip != null)); Prints "true". To load the GUIWindows I need an "empty" constructor, which looks like that: public GUIWindow() { Name = ""; Buttons = new List<Button>(); ImagePath = ""; System.Console.WriteLine("Image loaded? (In win) " + (GUIWindow.StandardBackgroundImage.ImageStrip != null)); //Image = new IngameImage(StandardBackgroundImage); //System.Console.WriteLine( //Image.IsActive = false; SelectedButton = null; IsActive = false; } As you can see, I commented lines out in the constructor. Because: Otherwise this would crash. Here the line System.Console.WriteLine("Image loaded? (In win) " + (GUIWindow.StandardBackgroundImage.ImageStrip != null)); Doesn't print anything, it just crashes with the following errormessage: Building content threw NullReferenceException: Object reference not set to an object instance. Why does this happen? Before the program wants to load the List, it prints "true". But in the constructor, so in the loading of the list it prints "false". Can anybody please tell me why this happens and how to fix it?

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• Struggling to get set up with JOGL2.0

  - by thecoshman

  I guess that Game Dev' is a more sensible place for my problem then SO. I did have JOGL1.1 set up and working, but I soon discovered that it did not support the latest OpenGL, so I started work on upgrading to JOGL2.0 it's not gone too well. Firstly, is it worth me trying to get JOGL to work, or should I just move over to LWJGL? I am fairly comfortable with OpenGL (via C++) and from what I did get working with JOGL1.1, I seem to be OK adapting to it. Assuming that I stick with JOGL, am I foolish for trying to use JOGL2.0? From what I can gather, JOGL2.0 is still in beta, but I am willing to go with it as I want to make use of the latest OpenGL I can. I have been using the Eclipse IDE and have set up a user library for JOGL, here is a screen shot of the configuration and I have added this user library to my own Eclipse project. the system variable %JOGL_HOME% points to "C:\Users\edacosh\Downloads\JOGL2.0" so that should work fine. Now, the problem I actually having, when I try to run my code, on the line GLProfile glp = GLProfile.getDefault(); The code stops with the following message... Exception in thread "main" java.lang.NoClassDefFoundError: com/jogamp/common/jvm/JVMUtil at javax.media.opengl.GLProfile.<clinit>(GLProfile.java:1145) at DiCE.DiCE.<init>(DiCE.java:33) at App.<init>(App.java:17) at App.main(App.java:12) Caused by: java.lang.ClassNotFoundException: com.jogamp.common.jvm.JVMUtil at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 4 more I have also set my project to ensure that it is using jre6 along with jdk6, as I was having some issues. I hope I have given you enough information to be able to help me. It probably doesn't help that I am rather new to Java, been developing in C++ for ages. Thanks

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• Game server for an android/iOS turn-based board-game

  - by Cyril

  I am currently programming an iPhone game and I would like to create an online multiplayer mode. In the future, this app will be port to Android devices, so I was wondering how to create the game-server? First at all, which language should I choose? How to make a server able to communicate both with programs written in objective-c and Java? Then, how to effectively do it? Is it good if I open a socket by client (there'll be 2)? What kind of information should I send to the server? to the clients?

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• Why do meshes show up as bones in the Model class?

  - by Itamar Marom

  Right now I'm working on a 3D game and I've come across something very weird. When I created the model in Blender, I added an armature named "MyBone" to the stage and attached a cube ("MyCube") to it, so that when I move the armature, the cube moves with it. I exported this as an FBX and loaded it as a Model object. What I expected to see was: But what I got was this: I'm really confused. Why is the mesh I created showing up in the bone list? And what's Root Node? Here are the .blend and .fbx files: here or here. Thanks.

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• problems selecting a mutliple select value from database in Rails

  - by Ramy

  From inside of a form_for in rails, I'm inserting multiple select values into the database, like this: <div class="new-partner-form"> <%= form_for [:admin, matching_profile.partner, matching_profile], :html => {:id => "edit_profile", :multipart => true} do |f| %> <%= f.submit "Submit", :class => "hidden" %> <div class="rounded-block quarter-wide radio-group"> <h4>Exclude customers from source:</h4> <%= f.select :source, User.select(:source).group(:source).order(:source).map {|u| [u.source,u.source]}, {:include_blank => false}, {:multiple => true} %> <%= f.error_message_on :source %> </div> I'm then trying to pull the value from the database like this: def does_not_contain_source(matching_profiles) Expression.select(matching_profiles, :source) do |keyword| Rails.logger.info("Keyword is : " + keyword) @customer_source_tokenizer ||= Tokenizer.new(User.select(:source).where("id = ?", self.owner_id).map {|u| u.source}[0]) #User.select("source").where("id = ?", self.owner_id).to_s) @customer_source_tokenizer.divergent?(keyword) end end but getting this: ExpressionErrors: Bad syntax: --- - "" - B - "" this is what the value is in the database but it seems to choke when i access it this way. What's the right way to do this?

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• iCloud + Storage of media in iPhone Documents folder

  - by Michael Morrison

  I, like many developers, got an email from Apple recently that stated we should move our data from the documents directory into another folder to permit more streamlined backup to iCloud. In recent testing it appears that [your app] stores a fair amount of data in its Documents folder. Since iCloud backups are performed daily over Wi-Fi for each user's iOS device, it's important to ensure the best possible user experience by minimizing the amount of data being stored by your app. Marco Arment, of instapaper fame, has a good take on the issue, which is that the recommended location for storing downloadable files is in /Library/Caches. However, the problem is that both /tmp and /Caches can be 'cleaned' anytime the OS decides that the device is running low on storage. If your app is cleaned then the data downloaded by your app and stored by your user is gone. Naturally, the user will blame you and not Apple. What to do?

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• typename resolution in cases of ambiguity

  - by parapura rajkumar

  I was playing with Visual Studio and templates. Consider this code struct Foo { struct Bar { }; static const int Bar=42; }; template<typename T> void MyFunction() { typename T::Bar f; } int main() { MyFunction<Foo>(); return 0; } When I compile this is either Visual Studio 2008 and 11, I get the following error error C2146: syntax error : missing ';' before identifier 'f' Is Visual Studio correct in this regard ? Is the code violating any standards ? If I change the code to struct Foo { struct Bar { }; static const int Bar=42; }; void SecondFunction( const int& ) { } template<typename T> void MyFunction() { SecondFunction( T::Bar ); } int main() { MyFunction<Foo>(); return 0; } it compiles without any warnings. In Foo::BLAH a member preferred over a type in case of conflicts ?

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• Business Units vs Teams in CRM 2011

  - by GuruJ

  I've been told a few times that Business Units in CRM 2011 are "tricky" and shouldn't be set up lightly since they have irreversible consequences for a CRM 2011 implementation. On the other hand, teams in CRM 2011 seem much more flexible in managing record security. For what reason would I still choose to set up Business Units in CRM 2011? What can I do with Business Units that I can't with Teams (and vice versa)?

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• Continual crashing in MKMapView annotationContainer:viewForAnnotation

  - by Oscar Goldman

  I've looked at other reports on this, and none seems to apply. Our app is being crippled by frequent (but not reliably reproducible) crashes like this: Reports of this turn up a lot on the Web, but many seem to go unsolved. I'm not doing anything crazy, just showing the user position and one marker on the map. I followed the examples I could find, and I've looked at the code for goofs but can't find any. Here's how my MapView delegate handles viewForAnnotation: The crash appears to be associated with a change in the user's location, but once the user-location marker is added, I don't mess with it. When I need to refresh the one other map marker, I skip the user marker when removing the other one: The delegate is the controller for the whole screen, so it's not being deallocated; the crash occurs while the screen is up. Not that it matters, but the map display looks like this: Any guesses or insight would be much appreciated! This is on iOS 5.0.1.

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• Problems manipulating strings through a stdcall to a dll

  - by ibiza

  I need to create a C++ dll that will be called from another program through stdcall. What is needed : the caller program will pass an array of string to the dll and the dll should change the string values in the array. The caller program will then continue to work with these string values that came from the dll. I made a simple test project and I am obviously missing something... Here is my test C++ dll : #ifndef _DLL_H_ #define _DLL_H_ #include <string> #include <iostream> struct strStruct { int len; char* string; }; __declspec (dllexport) int __stdcall TestFunction(strStruct* s) { std::cout << "Just got in dll" << std::endl; std::cout << s[0].string << std::endl; //////std::cout << s[1].string << std::endl; /* char str1[] = "foo"; strcpy(s[0].string, str1); s[0].len = 3; char str2[] = "foobar"; strcpy(s[1].string, str2); s[1].len = 6; */ //std::cout << s[0].string << std::endl; //std::cout << s[1].string << std::endl; std::cout << "Getting out of dll" << std::endl; return 1; } #endif and here is a simple C# program that I am using to test my test dll : using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; namespace TestStr { class Program { [DllImport("TestStrLib.dll", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)] public static extern int TestFunction(string[] s); static void Main(string[] args) { string[] test = new string[2] { "a1a1a1a1a1", "b2b2b2b2b2" }; Console.WriteLine(test[0]); Console.WriteLine(test[1]); TestFunction(test); Console.WriteLine(test[0]); Console.WriteLine(test[1]); Console.ReadLine(); } } } And here is the output produced : a1a1a1a1a1 b2b2b2b2b2 Just got in dll b2b2b2b2b2 Getting out of dll a1a1a1a1a1 b2b2b2b2b2 I have some questions : 1) Why is it outputting the element in the second position of the array rather than in the first position?? 2) If I uncomment the line commented with ////// in the dll file, the program crashes. Why? 3) Obviously I wanted to do more things in the dll (the parts in /* */) than what it does right now, but I am blocked by the first 2 questions... Thanks for all your help

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• Ruby (Rack) application could not be started - Passenger (3.0.9) error for rails 3.1.0 app on ubuntu and nginx (1.0.6) after deploying

  - by user938363

  Here is the error saying bcrypt was not loaded. The rails app is not using the Devise for authentication and gem bcrypt is not in Gemfile. Sometime, the webserver throws out the error saying spawn server can not start. gem list shows that both bcrypt-ruby 3.0.1 and 3.0.0 were installed. Ruby (Rack) application could not be started A source file that the application requires, is missing. * It is possible that you didn't upload your application files correctly. Please check whether all your application files are uploaded. * A required library may not installed. Please install all libraries that this application requires. Further information about the error may have been written to the application's log file. Please check it in order to analyse the problem. Error message: no such file to load -- bcrypt Exception class: LoadError Application root: /vol/www/emclab/current Backtrace: # File Line Location 0 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/dependencies.rb 240 in `require' 1 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/dependencies.rb 240 in `block in require' 2 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/dependencies.rb 225 in `load_dependency' 3 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/dependencies.rb 240 in `require' 4 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activemodel-3.1.0/lib/active_model/secure_password.rb 1 in `' 5 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/base.rb 2160 in `block in ' 6 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/base.rb 2140 in `class_eval' 7 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/base.rb 2140 in `' 8 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/base.rb 31 in `' 9 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/session_store.rb 77 in `' 10 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/session_store.rb 51 in `' 11 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/session_store.rb 1 in `' 12 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/application/configuration.rb 123 in `session_store' 13 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/application.rb 168 in `block in default_middleware_stack' 14 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/application.rb 142 in `tap' 15 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/application.rb 142 in `default_middleware_stack' 16 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/engine.rb 445 in `app' 17 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/application/finisher.rb 37 in `block in ' 18 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/initializable.rb 25 in `instance_exec' 19 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/initializable.rb 25 in `run' 20 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/initializable.rb 50 in `block in run_initializers' 21 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/initializable.rb 49 in `each' 22 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/initializable.rb 49 in `run_initializers' 23 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/application.rb 92 in `initialize!' 24 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/railties-3.1.0/lib/rails/railtie/configurable.rb 30 in `method_missing' 25 /vol/www/emclab/releases/20111115184804/config/environment.rb 5 in `' 26 config.ru 3 in `require' 27 config.ru 3 in `block in ' 28 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/builder.rb 51 in `instance_eval' 29 /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/rack-1.3.2/lib/rack/builder.rb 51 in `initialize' 30 config.ru 1 in `new' 31 config.ru 1 in `' 32 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb 222 in `eval' 33 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb 222 in `load_rack_app' 34 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb 156 in `block in initialize_server' 35 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/utils.rb 572 in `report_app_init_status' 36 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb 153 in `initialize_server' 37 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb 204 in `start_synchronously' 38 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb 180 in `start' 39 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/rack/application_spawner.rb 128 in `start' 40 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb 253 in `block (2 levels) in spawn_rack_application' 41 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb 132 in `lookup_or_add' 42 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb 246 in `block in spawn_rack_application' 43 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb 82 in `block in synchronize' 44 prelude> 10:in `synchronize' 45 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb 79 in `synchronize' 46 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb 244 in `spawn_rack_application' 47 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb 137 in `spawn_application' 48 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb 275 in `handle_spawn_application' 49 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb 357 in `server_main_loop' 50 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb 206 in `start_synchronously' 51 /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/helper-scripts/passenger-spawn-server 99 in `' cap deploy:check returns: You appear to have all necessary dependencies installed Any thoughts about the problem? thanks!

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• Why a revert a file in EGit, but the dirty symbol '<' still exist in the project view?

  - by Happier

  I try EGit revert for several days, It's very confuse that when I revert the file following the user guide, and I still got the file dirty symbol in the related file. http://wiki.eclipse.org/EGit/User_Guide#Reverting_Changes I choose 'Replace with' - 'File in Git Index', it works, the content has been revert, but the symbol stays the same, sometimes, the symbol will disappear after a while, but sometimes, it didn't disappear. I'm using eclipse on windows, I'm not sure it's about the '\r\n' character. But I use 'Compare with ' - 'File in Git Index', two files look the same. Hope someone can tell me why, I think it can be a bug? Thank you in advance.

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• Is there any short way to load data to the properties of a class, for each column name matching the properties of the class?

  - by Ugur Gümüshan

  I want to load data to an instance of an object using its constructor and I write $this->property=$row["colname"] each time for each property. the mysql_fetch_object function fetches the data as an object but I am not sure if the instance of an object can be assigned to some object from inside. othwerwise I would use __construct($object) { $this=$object; } //doesn't give any syntax error Maybe I should look into iteration of properties and use foreach($object as $key => $value) $value=$object[$key]; or can I assign like $this=$object; within the constructor?

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• Best approach for using Scanner Objects in Java?

  - by devjeetroy

  Although I'm more of a C++/ASM guy, I have to work with java as a part of my undergrad course at college. Our teacher taught us input using Scanner(System.in), and told us that if multiple functions are were taking user input, it would be advisable that a single Scanner object is passed around so as to reduce chances of the input stream getting screwed up. Now using this approach has gotten me into a situation where I'm trying to use a Scanner.nextLine(), and this statement does not wait for user input. It just moves on to the following statement. I figured there may be some residual cr/lf or other characters in the Scanner that might not have been retrieved are causing the problem. Here is the code. while(lineScanner.hasNext()) { if(isPlaceHolder(temp = lineScanner.next())) { temp = temp.replace("<",""); temp = temp.replace(">", ""); System.out.print("Enter "+aOrA(temp.charAt(0)) +" " +temp + " : "); temp = consoleInput.nextLine(); } outputFileStream.print(temp + " "); } All of the code is inside a function which receives a Scanner object consoleInput. Ok, so what happens when i run it is that when the program enters the if() the first time, It carries out theSystem.out.print, does not wait for user input, and moves on to the second time that it enters the 'if' block. This time, it takes the input and the rest of the program operates normally. What is even more surprising is that when i check the output file created by the program, it is perfect, just as i want to be. Almost as if the first time input using the scanner is correct. I have solved this problem by creating a new system.in Scanner in the function itself, instead of receiving the Scanner object as a parameter. But I am still very curious to know what the hell is happening and why it couldn't be solved using a simple Scanner.reset(). Would it be better to just simply create a Scanner Object for each function? Thanks, Devjeet PS. Although I know how to take input using fileinputstreams and the like, we are not supposed to use it with the homework.

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• Using outer query result in a subquery in postgresql

  - by brad

  I have two tables points and contacts and I'm trying to get the average points.score per contact grouped on a monthly basis. Note that points and contacts aren't related, I just want the sum of points created in a month divided by the number of contacts that existed in that month. So, I need to sum points grouped by the created_at month, and I need to take the count of contacts FOR THAT MONTH ONLY. It's that last part that's tricking me up. I'm not sure how I can use a column from an outer query in the subquery. I tried something like this: SELECT SUM(score) AS points_sum, EXTRACT(month FROM created_at) AS month, date_trunc('MONTH', created_at) + INTERVAL '1 month' AS next_month, (SELECT COUNT(id) FROM contacts WHERE contacts.created_at <= next_month) as contact_count FROM points GROUP BY month, next_month ORDER BY month So, I'm extracting the actual month that my points are being summed, and at the same time, getting the beginning of the next_month so that I can say "Get me the count of contacts where their created at is < next_month" But it complains that column next_month doesn't exist This is understandable as the subquery knows nothing about the outer query. Qualifying with points.next_month doesn't work either. So can someone point me in the right direction of how to achieve this? Tables: Points score | created_at 10 | "2011-11-15 21:44:00.363423" 11 | "2011-10-15 21:44:00.69667" 12 | "2011-09-15 21:44:00.773289" 13 | "2011-08-15 21:44:00.848838" 14 | "2011-07-15 21:44:00.924152" Contacts id | created_at 6 | "2011-07-15 21:43:17.534777" 5 | "2011-08-15 21:43:17.520828" 4 | "2011-09-15 21:43:17.506452" 3 | "2011-10-15 21:43:17.491848" 1 | "2011-11-15 21:42:54.759225" sum, month and next_month (without the subselect) sum | month | next_month 14 | 7 | "2011-08-01 00:00:00" 13 | 8 | "2011-09-01 00:00:00" 12 | 9 | "2011-10-01 00:00:00" 11 | 10 | "2011-11-01 00:00:00" 10 | 11 | "2011-12-01 00:00:00"

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• Subversion Deployment tools: specify branch/tag, revision and target machine

  - by Terman

  What are some non commercial deployment tools that allows a developer to speficy: a branch/tag, a revision and a target machine to deploy code to? I was wondering if there's a ccnet plugin of some sort that would allow the above to be specified. I know this could be done with a NAnt deploy script. However considering we're mostly using gui tools for feedback, plus the tortoise svn repository browser, it be cool to lear if there's an GUI simple GUI tool/plugin cheers.

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• How to copy_if from map to vector?

  - by VJo

  I'd like to copy values that match a predicate (equal ints) from a map<string,int> to a vector<int>. This is what I tried: #include <map> #include <vector> #include <algorithm> int main() { std::vector< int > v; std::map< std::string, int > m; m[ "1" ] = 1; m[ "2" ] = 2; m[ "3" ] = 3; m[ "4" ] = 4; m[ "5" ] = 5; std::copy_if( m.begin(), m.end(), v.begin(), [] ( const std::pair< std::string,int > &it ) { return ( 0 == ( it.second % 2 ) ); } ); } The error message from g++ 4.6.1 is : error: cannot convert 'std::pair<const std::basic_string<char>, int>' to 'int' in assignment Is there a way to adjust the example to do the above copy?

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• Finding the specific type held in an ArrayList<Object> (ie. Object = String, etc.)

  - by Christopher Griffith

  Say I have an ArrayList that I have cast to an ArrayList of objects. I know that all the objects that were in the ArrayList I cast were of the same type, but not what the type was. Now, if the ArrayList is not empty, I could take one of the objects in it and use the instanceof operator to learn what the actual type is. But what of the case where the ArrayList is empty? How do I determine what type Object actually is then? Is it possible?

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• Java NoSuchElementException using scanner.nextInt()

  - by othnin

  I am trying to read in a pgm file (512x512 array) and when I read in a larger file I get the error: java.util.NoSuchElementException on reading element (3,97). I have created a much smaller file to read (23x23) and it reads fine. Is there a size limit? I have checked the file and confirmed that there is an int for the value: This appears to be the line it crashes at: fileArray[row][col] = scan.nextInt(); Here is the file: import java.util.Scanner; import java.io.*; public class FileReader { public static void main(String[] args) throws IOException { String fileName = "lena.pgma"; int width, height, maxValue; FileInputStream fileInputStream = null; fileInputStream = new FileInputStream(fileName); Scanner scan = new Scanner(fileInputStream); // Discard the magic number scan.nextLine(); // Discard the comment line scan.nextLine(); // Read pic width, height and max value width = scan.nextInt(); System.out.println("Width: " + width); height = scan.nextInt(); System.out.println("Heigth: " + height); maxValue = scan.nextInt(); fileInputStream.close(); // Now parse the file as binary data FileInputStream fin = new FileInputStream(fileName); DataInputStream dis = new DataInputStream(fin); // look for 4 lines (i.e.: the header) and discard them int numnewlines = 4; while (numnewlines > 0) { char c; do { c = (char)(dis.readUnsignedByte()); } while (c != '\n'); numnewlines--; } // read the image data int[][] fileArray = new int[height][width]; for (int row = 0; row < height; row++) { for (int col = 0; col < width; col++) { fileArray[row][col] = scan.nextInt(); System.out.print("(" + row + " ," + col +"): " + fileArray[row][col]+ " "); } System.out.println(); } dis.close(); } } any advise would be appreciated.

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• AS3 and cross-domain

  - by Davide Arcinotti

  I think i'm a little confused. I'm loading an swf, located at domainB.com/secondsubfolder, from an swf located at domainA.com/firstsubfolder. I always put the crossdomain.xml near the "loader" swf in domainA.com/firstsubfolder. It seems to not work, except if I put the crossdomain.xml in the root of the loaded content, domainB.com/crossdomain.xml. Did I always do it wrong, or is it because of some server setting? Using another domain for the loaded content, e.g. domainB_beta.com/secondsubfolder on another server just works as usual. Where do I have to look to change these settings? Does it depend on server settings, or am I doing something wrong? This is the loader actionscript code: import flash.display.Loader; import flash.net.URLRequest; import flash.system.Security; Security.allowDomain("domainB.com"); var context:LoaderContext = new LoaderContext(); context.securityDomain = SecurityDomain.currentDomain; var loaderMain:Loader = new Loader(); loaderMain.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, errorHandler); loaderMain.contentLoaderInfo.addEventListener(SecurityErrorEvent.SECURITY_ERROR, errorHandler); loaderMain.load(new URLRequest('domainB/secondsubfolder/file.swf'),context); addChild(loaderMain); function errorHandler(event:ErrorEvent):void { trace("errorHandler says: " + event); }

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• License For (Mostly) Open Source Website / Service

  - by Ryan Sullivan

  I have an interesting setup and am not sure how to license a website. I know this is not legal advice, and I am not asking for any. There are so many different Open Source Licenses and I do not have the time to read every last one to see which best fits my situation. Really, I am looking for suggestions and a nudge in the right direction. My setup is: I give away for free version of my web service with a clean website interface. The implementation I use in the actual web site is (almost) identical to what I give away. The main service works the exactly the same way, but the website interface to manage features in the service is fairly different. Really the web interfaces have the same exact backend, and the front ends accomplish the same tasks, but the service I offer on my site is very rich and uses a good deal of javascript, where I kept the interface in the version I give away as simple and javascript-less as possible. Mostly so it is easy to understand and integrate into other sites. I am not entirely sure how I should license this. It is more like I develop an open source service but have a separate site built upon it. I like the GPLv3 but I am not sure if I can use it in this case especially since I am making some money off of google ad's on the site and plan on using amazon affiliates as well. Any help would be greatly appreciated. I do want to open it up as much as possible. But I still want to be able to continue with my own implementation. Thanks in advance for any information or help anyone can provide.

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• Custom View with Bindings in a NSTableCellView

  - by Kyle Kinkade

  i have an XCode 4 project for mac desktop. It has a tableview in it that uses NSTableCellViews. The TableView is connected to an NSArrayController to provide it's content. This is using bindings for custom labels and the like, which has worked out rather well. I have a custom view that i would like to put in the NSTableCellView, which will use custom drawing based on a NSNumber value from my Table Cell View binding. Since XCode 4, you can no longer have ibplugins, which means i can no longer create custom bindings for interface builder to work with. How can I still get this value to my custom view?

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• Need to change page location for a Wordpress site

  - by PhilipK

  UPDATED I'm building a WP blog around an existing website. http://uk2canadapensiontransfers.com/news.php When I use the following default code... <?php wp_get_archives('title_li=&type=postbypost&limit=10'); ?> or previous and next page links... Wordpress attaches strings like... ?p=%post_id% to index.php But I need them to attach to news.php, e.g. news.php?p=%post_id% How can I change the Wordpress settings so that news.php can be my index and index.php remaind outside of the WP system.

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