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• Can anyone explain why this behaviour might be happening in Windows Forms?

  - by gizgok

  I'm developing a Windows Forms Application. See attached image for the Interface. Now I've put a close button (X) in the Panel(say Panel2) which has Application Constants as label.The first combo box is in another panel(say Panel1). Now when I click on the X button in Panel 2 I want the Panel to be invisible and the combo box text to be blank. Simple enough. So I write Panel2.visible=false; comboBox1.SelectedIndex=-1; When I click on X, the text in combo box goes blank, then I have to click again for the Panel2 to go invisible. Then I changed the sequence comboBox1.SelectedIndex=-1; Panel2.visible=fasle; and this works smooth. Not sure why this might be happening? Is there anything that I might be doing with my form design/code to have such a behaviour?

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• Object-oriented Programming - need your help

  - by wanderameise

  hey folks, I try to realize a little game project to dive deeper into OO programming (winforms c++/cli). I already started coding but now I´d like to make a re-design. For the beginning the game should consist of four parts like game-engine, user interface, highscore and playground. Heres a little (non-UML-conform) class diagramm to visualize my purposes http://i.imgur.com/lmpwj.png Would this be the right way? In my eyes the game engine is responsible to control the game sequences (state machine?) and exchanges information betweens all other classes. I appreciate any help!

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• What are the different methods for injecting cross-cutting concerns?

  - by Stacy Vicknair

  What are the different methods for injecting cross-cutting concerns into a class so that I can minimize the coupling of the classes involved while keeping the code testable (TDD or otherwise)? For example, consider if I have a class that requires both logging functionality and centralized exception management. Should I use DIP and inject both required concerns via an interface into the class that requires them? Should I use a service locater that I pass to each class that will require some cross cutting functionality? Is there a different solution altogether? Am I asking the wrong question entirely?

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• Is there a way to show a 3-D surface plot in the browser?

  - by Phage

  I've got a bunch of data for 3-D surface plots. I want to build a quick web interface to let me browse through that data. Are there any (free) packages out there that can easily show surface plots? I found this question but the suggested libraries did not support surface plots. If it requires a plugin like flash / java that is fine. This is for prototyping so a quick 'n dirty solution is preferred. Right now, the only option I have come up with is to use gnuplot to serve up static images. It would be awesome if there was some way to provide an interactive 3-D surface plot in the browser.

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• Adding new column in Sales Order View Items in Magento Admin

  - by fdierre

  In the admin interface of Magento I need to modify the tables in the Sales / Order / View order so that it shows, besides the products name, their manufacturer as well. I'm trying to look for the file to modify to make that happen. I thought I would find a section with all the columns that are displayed in app/code/core/Mage/Sales/Block/Order/Item/Renderer/Default.php but by inspecting it there seem to be no reference to the columns/product attributes. I also tried to modify app/design/adminhtml/default/default/template/sales/order/view/items/renderer/default.phtml by changing <?php echo $this->getColumnHtml($_item, 'name') ?> into <?php echo $this->getColumnHtml($_item, 'manufacturer') ?> but it changed nothing, so I suppose that file is not involved... Can anybody please point me to the right file to modify? Thank you!

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• DrawRect on the iPhone vs. the Mac

  - by Joe Cannatti

  I am an experienced iPhone dev beginning to work on my first Mac app. One thing that is really throwing me off is the differences between UIView and NSView. It seems that I cannot set the background color of a NSView via interface builder as I can with a UIView. It also seems that I cannot do it by simply sending a setBackgroundColor: message to it. All the examples I have seen are overriding drawRect: in a subclass of NSView. Is that really the only way to do it? What is the conceptual difference here, and why is it this way? NOTE: I am only trying to set the background color to the default grey.

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• Open source LINQ search engine for website

  - by Noel

  I want to add a search engine to my website. I want it to handler boolean searches and give me a list of results in order or best match. I need it to be able to work with LINQ, because I want to add additional where clauses to the final query that gets run. I am looking for the best open source .NET search engine that works with LINQ. I like lucene.net but the problem is the LINQ interface (LINQ to Lucene) hasn't been updated since 2008. Are there any good options out there?

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• Flexible Data source for Multi-Section Table View Controller

  - by TuanCM

  I have a TableViewController which display a list of NewsItem objects: @interface NewsItem : NSObject { NSString *feedID; NSString *title; NSDate *published; } I'm trying to implement a Table View Controller (multiple sections) that can display the list in two ways: One divide News Items into sections which based on Published Date The other would be based on FeedID (News source). And I don't know how to structure the data source so that the code is easy to maintain. I tried to put the list of News Items into a 2 dimension Array in this case is a NSMutableArray of NSArray objects. However I got some objc_exception_throw and I don't think this is flexible enough. Could you guys give me some ideas?

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• Call a C++ constructor from an Objective C class

  - by syvex

  How can I call a C++ constructor from inside an Objective C class? class CppClass { public: CppClass(int arg1, const std::string& arg2): _arg1(arg1), _arg2(arg2) { } // ... private: int _arg1; std::string _arg2; }; @interface ObjC: NSObject { CppClass _cppClass; } @end @implementation ObjC - (id)init { self = [super init]; if ( self ) { // what is the syntax to call CppClass::CppClass(5, "hello") on _cppClass? } return self; } @end

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• How to grab all cookies in Flash

  - by Leticia Meyer

  For a site I'm developing with a user login that uses cookies to store the session ID, a separate section of it uses Flash to provide content and such. Is there some way it can access the cookies that were set the by login? The name of the cookie will not the be same every time, as it is randomly generated, as well as its value. I then need to send the name and value of the cookie back to a page on the server to do additional stuff. Anyone know how to do this? Note that I didn't write the Flash interface, an the person who did doesn't know how to do this. Please help me, and thanks in advance!

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• Mathematica & J/Link: Memory Constraints?

  - by D-Bug

  I am doing a computing-intensive benchmark using Mathematica and its J/Link Java interface. The benchmark grinds to a halt if a memory footprint of about 320 MB is reached, since this seems to be the limit and the garbage collector needs more and more time and will eventually fail. The Mathematica function ReinstallJava takes the argument command line. I tried to do ReinstallJava[CommandLine -> "java -Xmx2000m ..."] but Mathematica seems to ignore the -Xmx option completely. How can I set the -Xmx memory option for my java program? Where does the limit of 320 MB come from? Any help would be greatly appreciated.

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• Reuse C++ Header files

  - by Amrish

  Guys, I have a Visual C++ solution with 2 projects AlgorithmA & AlgorithmB and both share a common header file RunAlgo.h with the class declaration. Each project in the solution has its own unique implementation for the header file. I am trying to compile a DLL out of the common header file RunAlgo.h and add reference to this DLL in the projects AlgorithmA & AlgorithmB. I have then included separate RunAlgo.cpp definition file in both my projects. The problem is that I am getting linker errors while compiling the new DLL project which has only the header file. So, the question is Can a header file with only class declaration be compiled into a DLL (Similar to class library containing an Interface in C#)? For the above scenario, is there a better approach to reuse the common Header file among projects? Should the above method work (re-check my code?)

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• Do I have to worry about escaping XML reserved characters before I return a DataContract object from

  - by Brett Widmeier

  Hi, I am pretty inexperienced with WCF. I have a DataContract that implements the IExtensibleDataObject interface. Some of the members of this object are populated from freetext input and could contain XML reserved characters ('', for example). I imagine that I get escaping of these characters for free with WCF, but I have been looking around and could not find anything commenting on this one way or another. Is this the case? I have set my service to log the messages that it sends and receives for viewing in the Trace Viewer. Part of a message that my service returns looks like this: <sInstructions>"></sInstructions> Now, I have a couple questions about this. 1) Is it actually transmitting "&gt; and just showing it in a more readable form in the trace viewer? 2) If it is actually is transmitting ">, is this legal XML?

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• should variable be retained or not? iphone-sdk

  - by psebos

  Hi, in the following piece of code I got from a book. The NSString *pPath which is defined in the class as an instance variable. @interface MainViewController : UIViewController { NSString *pPath; } In the implementation after being set it is being retained. I assume that with the assignment the object is automatically retained (because it is an NSString) and there is no need to additionally retain it. - (void) initPrefsFilePath { NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; pPath = [documentsDirectory stringByAppendingPathComponent: @"flippingprefs.plist"]; [pPath retain]; }

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• Users adding views

  - by adamprocter

  I have created a main page (myAppViewController) and a add page rect button I have also created a page template (TemplateAViewController) all set up in Interface builder. I would like users to be able to add as many templates themselves and then page through them. I am not sure where to start. I can create views programmatic like so -(IBAction)createnewpage : (id) sender { myAppViewController *viewcontroller = [[myAppViewController alloc] initWithNibName:@"TemplateAViewController" bundle:[NSBundle mainBundle]]; [[self view] addSubview:viewcontroller.view]; } I then want to be able to navigate through these views- I guess I need to create a navigation controller to do this ?

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• JPA EclipseLink Auditing for Oracle issue with SessionCustomizer...

  - by enrique

  I was trying to use the SessionCustomizer for auditing with v$session.program for oracle and it works with JDBC but i need it working with JPA, so i read a bit more the documentation for SESSION_CUSTOMIZER in this site: http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_(ELUG)#EclipseLink_JPA_Persistence_Unit_Properties_for_Customization_and_Validation but had not lucky in making it work in passing the program name parameter to oracle with the v$session.program... i was using the SessionCustomizer and it is an interface so my code is as follows: package com.util; import org.eclipse.persistence.config.SessionCustomizer; import org.eclipse.persistence.sessions.Session; /** * * @author xkalibur */ public class ProgramCustomizer implements SessionCustomizer{ public void customize(Session s) throws Exception { s.getDatasourceLogin().setProperty("v$session.program","Customers"); } } then in CustomerFacade : ProgramCustomizer pc=new ProgramCustomizer(); public void edit(Customer customer) { emProperties.put(PersistenceUnitProperties.SESSION_CUSTOMIZER,pc); em=factory.createEntityManager(emProperties); em.merge(customer); } and returns the following error: javax.ejb.EJBException Caused by: java.lang.NullPointerException at com.facades.CustomerFacade.edit(CustomerFacade.java:48) please some help...

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• Why are there two implementations of std::sort (with and without a comparator) rather than one implementation with a default template parameter?

  - by PolyVox

  In my code I'm adopting a design strategy which is similar to some standard library algorithms in that the exact behavior can be customized by a function object. The simplest example is std::sort, where a function object can control how the comparison is made between objects. I notice that the Visual C++ provides two implementations of std::sort, which naturally involves code duplication. I would have imagined that it was instead possible to have only one implementation, and provide a default comparator (using operator< ) as a default template parameter. What is the rational behind two separate versions? Would my suggestion make the interface more complex in some way? Or result in confusing error messages when the object does not provide operator Thanks, David

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• Find changed properties of a class

  - by Rohit

  I am using asp.net 3.5 I have a license class containing 10 properties and not marked as serializable. I have to log property changes to the database. License is an entity class,and it is not in my scope to modify it. So I cannot mark it as serializabel neither i can use IpropertyChanged Interface. Now i cannot store it in viewstate as it is not serializable. I wanted to store it so that i can compare it with new values and see which value has changed. How to proceed with this.

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• Why doesn't Java Map extends Collection?

  - by polygenelubricants

  I was surprised by the fact that Map<?,?> is not a Collection<?>. I thought it'd make a LOT of sense if it was declared as such: public interface Map<K,V> extends Collection<Map.Entry<K,V>> After all, a Map<K,V> is a collection of Map.Entry<K,V>, isn't it? So is there a good reason why it's not implemented as such?

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• Django: how to create sites dynamically?

  - by Leandro Ardissone

  Hi, I need to create an application for the company where I can create sites dynamically. For example, I need an admin interface (Django's admin is enough) where I can setup a new site and add some settings to it. Each site must hold a domain (domains can be manually added to apache conf, but if Django can handle it too would be awesome). Each site must be independent of the others, I mean, I shouldn't be able to see the data content of other sites but I can share same applications/models. I've seen the Django's Sites framework, but I'm not sure if it's possible to implement that way. Should I use Sites framework or create a new app that can handle sites better? What do you think?

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• API verbs for an interruptible operation

  - by 280Z28

  I have a long running task as part of my application. The task can be started, paused, resumed, and cancelled. I'm trying to find the best interface for these operations. Two seem clear: Pause and Cancel. This leaves the start and resume operations. I could include both Start and Resume. This has the downside of either requiring the API consumer to check the state before starting/resuming the operation to call the right method, or making the methods aliases of each other. I'm thinking I should include either Start or Resume, but I don't know which one is the most appropriate. Does anyone have any examples in the .NET Framework of such behavior? I prefer to follow established patterns whenever they are available.

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• C++ Boost bind value type

  - by aaa

  hello. I look in documentation and source code but cannot figure out how to get return value type of boost bind functor. I am trying to accomplish following: 35 template<typename T,size_t N, class F> 36 boost::array<typename F::value_type, N> make_array(T (&input)[N], F unary) { 37 boost::array<typename F::value_type, N> array; 38 std::transform(input, input + N, array.begin(), unary); 39 return array; 40 } where F can be bind functor. the above does not work because functor does not have value_type. for that matter, is there standard interface for unary/binary functor as far as return value. Thanks

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• Which faces technology for use with GlassFish 2.1 and NetBeans 6.7?

  - by SteJav

  I'm running GlassFish 2.1 and using NetBeans 6.7. I'd like to create a web interface to my data using JSF 1.2. Trouble is, I'm not sure which 'faces' technology to learn (that includes some good documentation). JBoss/RichFaces seem pretty good on documentation, but I'm using GlassFish. Any thoughts? The choices appear overwhelming: Tomahawk Tobago Trinidad ICEfaces RCFaces Netadvantage WebGalileoFaces QuipuKit BluePrints Woodstock JBoss RichFaces Ajax4jsf ILOG Oracle ADF G4JSF Simplica Backbase jenia4faces VisualWebPack DynaFaces IBM Impl Dinamica Mojarra PrimeFaces jQuery OpenFaces ZK ExtJS Anybody had any experience with any of the above and found the documentation to be clear to a beginner? Being a JSF/Web beginner, I tried some ICEFaces, Mojarra tutorials and had a go at getting RichFaces working with NBeans and GlassFish, but no luck. Lots of XML complaints. I'm clearly missing some huge chunks of configuration, but I can't find any documentation to help me. Any suggestions would be much appreciated :-)

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• Problem running VBScript from my UIAccess VB app using MSScriptControl

  - by Ray

  I'm trying to run some VBSCRIPT from within my application. This works fine when I run my program from within VB. But once I add "UIAccess=true" to my manifest and digitally sign my exe with my certificate, I am unable to run the code any more. It gives errors when I try to interface with any program saying "429: ActiveX component can't create object: 'myApp.Application'". Anyone have any idea why it would run fine in the IDE but not with an application with uses UIAccess? Here is the code: Dim scriptRunner As New MSScriptControl.ScriptControlClass scriptRunner.Language = "VBScript" scriptRunner.AllowUI = True scriptRunner.Timeout = 3000 scriptRunner.AddCode(scriptStr) scriptRunner = Nothing

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• enabling tomcat web apps to be served from Ubuntu lucid

  - by user558925

  Hi, I have tomcat running on 8080 on a ubuntu lucid server. I am able to access it fro local machine. However I am unable to access the tomcat from any machine outside. Is it due to firewall restrictions. WHat do I need to do to enable accessing tomcat from remote machines. Tried adding this rule to iptables but it did not solve iptables --table nat --append PREROUTING --protocol tcp --destination-port 80 \ --in-interface eth0 --jump REDIRECT --to-port 8080 Any help would be appreciated Thanks Bala Thiruppanambakkam

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