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• What is the correct Qt idiom for exposing signals/slots of contained widgets?

  - by Tyler McHenry

  Suppose I have a MyWidget which contains a MySubWidget, e.g. a custom widget that contains a text field or something. I want other classes to be able to connect to signals and slots exposed by the contained MySubWidget instance. Is the conventional way to do this: Expose a pointer to the MySubWidget instance through a subWidget() method in MyWidget Duplicate the signals and slots of MySubWidget in the MyWidget class and write "forwarding" code Something else? Choice 1 seems like the least code, but it also sort of breaks encapsulation, since now other classes know what the contained widgets of MyWidget are and might become dependent on their functionality. Choice 2 seems like it keeps encapsulation, but it's a lot of seemingly redundant and potentially convoluted code that kind of messes up the elegance of the whole signals and slots system. What is normally done in this situation?

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• android: How to set a listener that fires when my ViewFlipper shows a new child

  - by Joseph Cheek

  Hi Android gurus, I have a ViewFlipper for which I want a listener to fire when the child displayed is changed. I have set an OnFocusChangeListener to the ViewFlipper but it never fires when I flip from child 0 to child 1 or vice-versa. The ViewFlipper contains two RelativeLayouts and I have tried setting OnFocusChangeListeners for those but I get a ClassCastException when I try to set it. Here's my code: RelativeLayout songsLayout = (RelativeLayout) findViewById(R.id.song_page_layout); songsLayout.setOnFocusChangeListener(new OnFocusChangeListener() { public void onFocusChange(View view, boolean hasFocus) { showPopUp("View " + view.getId() + " now has focus: " + hasFocus); } } ); R.is.song_page_layout is one of my RelativeLayouts and showPopUp() is a function I use to show, well, popups. Does anyone have working code for some sort of trigger that fires when a ViewFlipper changes which child is displayed?

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• ADD COLUMN to sqlite db IF NOT EXISTS - flex/air sqlite?

  - by Adam

  I've got a flex/air app I've been working on, it uses a local sqlite database that is created on the initial application start. I've added some features to the application and in the process I had to add a new field to one of the database tables. My questions is how to I go about getting the application to create one new field that is located in a table that already exists? this is a the line that creates the table stmt.text = "CREATE TABLE IF NOT EXISTS tbl_status ("+"status_id INTEGER PRIMARY KEY AUTOINCREMENT,"+" status_status TEXT)"; And now I'd like to add a status_default field. thanks! Thanks - MPelletier I've add the code you provided and it does add the field, but now the next time I restart my app I get an error - 'status_default' already exists'. So how can I go about adding some sort of a IF NOT EXISTS statement to the line you provided?

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• JQuery IE7 Z-Index Bug

  - by Thomas

  I built a Jquery dropdown menu using this tutorial: http://noupe.indexsite.org/tutorial/drop-down-menu-jquery-css.html It works across browsers except for IE7 (shooooocking). There seems to be a z-index sorting problem and the drop down menu shows up under all of my other JQuery elements. Im not sure how to set the z-index so that it shows up on top. I have thoroughly googled the issue and it seems to be related to multiple 'position:relative' elements. I've messed with it for a few hours but I can't seem to sort it out. I have already tried defining z-index for all the different page elements but it doesn't seem t help the situation. You can check out the problem here: http://hardtopdepot.com/dev/index.html Any help would be really appreciated - thanks! Also, I know there are other IE7 issues, but Im pretty confident that I can solve those as they are standard IE padding/margins nonsense.

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• Need help understanding Generics, How To Abstract Types Question.

  - by kmacmahon

  I could use some really good links that explain Generics and how to use them. But I also have a very specific question, relater to working on a current project. Given this class constructor: public class SecuredDomainViewModel<TDomainContext, TEntity> : DomainViewModel<TDomainContext, TEntity> where TDomainContext : DomainContext, new() where TEntity : Entity, new() public SecuredDomainViewModel(TDomainContext domainContext, ProtectedItem protectedItem) : base(domainContext) { this.protectedItem = protectedItem; } And its creation this way: DomainViewModel d; d = new SecuredDomainViewModel<MyContext, MyEntityType>(this.context, selectedProtectedItem); Assuming I have 20 different EntityTypes within MyContext, is there any easier way to call the constructor without a large switch statement? Also, since d is DomainViewModel and I later need to access methods from SecuredDomainViewModel, it seems I need to do this: if (((SecuredDomainViewModel<MyContext, MyEntityType>)d).CanEditEntity) But again "MyEntityType" could actually be one of 20 diffent types. Is there anyway to write these types of statements where MyEntityType is returned from some sort of Reflection?

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• Need help understanding Generics, How To Abstract Types Question.

  - by kmacmahon

  I could use some really good links that explain Generics and how to use them. But I also have a very specific question, relater to working on a current project. Given this class constructor: public class SecuredDomainViewModel<TDomainContext, TEntity> : DomainViewModel<TDomainContext, TEntity> where TDomainContext : DomainContext, new() where TEntity : Entity, new() And its creation this way: DomainViewModel d; d = new SecuredDomainViewModel<MyContext, MyEntityType>(this.context, selectedProtectedItem); Assuming I have 20 EntityTypes within MyContext, is there any easier way to call the constructor without a large switch statement? Also, since d is DomainViewModel and I want to access methods for SecuredDomainViewModel, it seems I need to do this: if (((SecuredDomainViewModel<MyContext, MyEntityType>)d).IsBusy) But again "MyEntityType" could actually be one of 20 types. Is there anyway to write these types of statements where MyEntityType is returned from some sort of Reflection?

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• DB structure for Twitter home/Facebook wall?

  - by mathon12

  Basically a live feed of all your friends' recent posts. In a stupid sort of approach I think I'd start by building a query like: SELECT * FROM tblposts WHERE userid=friend_id_1OR userid=friend_id_2...... and so on Where friend_id_% is the userid of a friend from your friends list. But this must be a very inefficient way of doing it, right? Is there any faster way of doing this in MySQL? Maybe some clever DB schema? (I know FB uses Hadoob but I'm not experienced enough to go that far :( )

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• What does the caret operator in Python do?

  - by Fry

  I ran across the caret operator in python today and trying it out, I got the following output: >>> 8^3 11 >>> 8^4 12 >>> 8^1 9 >>> 8^0 8 >>> 7^1 6 >>> 7^2 5 >>> 7^7 0 >>> 7^8 15 >>> 9^1 8 >>> 16^1 17 >>> 15^1 14 >>> It seems to be based on 8, so I'm guessing some sort of byte operation? I can't seem to find much about this searching sites other than it behaves oddly for floats, does anybody have a link to what this operator does or can you explain it here?

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• Printing PDFs Server-side using Acrobat Reader from ASP.NET

  - by Chris Roberts

  Hi, I have been presented with a problem which requires me to print PDF files from a server as part of an ASP.NET web service. The problem is further complicated by the fact that the PDF files I have to print can ONLY be printed using Adobe Reader (they were created using Adobe LiveCycle and have some strange protection in them). This piece of code seems to do the trick in the Visual Studio development web server, but doesn't do anything when the site's running in IIS. I'm assuming this is probably some sort of permissions issue!? I know this is a FAR from ideal thing to be trying to do, but I haven't really got much choice! Any ideas would be greatly appreciated! Dim starter As ProcessStartInfo Dim Prc As Process ' Pass File Path And Arguments starter = New ProcessStartInfo("c:\program files\...\AcroRd32.exe", "/t ""test.pdf"" ""Printer""") starter.CreateNoWindow = True starter.RedirectStandardOutput = True starter.UseShellExecute = False ' Start Adobe Process Prc = New Process() Prc.StartInfo = starter Prc.Start()

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• Design for a machine learning artificial intelligence framework (community wiki)

  - by Lirik

  This is a community wiki which aims to provide a good design for a machine learning/artificial intelligence framework (ML/AI framework). Please contribute to the design of a language-agnostic framework which would allow multiple ML/AI algorithms to be plugged into a single framework which: runs the algorithms with a user-specified data set. facilitates learning, qualification, and classification. allows users to easily plug in new algorithms. can aggregate or create an ensemble of the existing algorithms. can save/load the progress of the algorithm (i.e. save the network and weights of a neural network, save the tree of a decision tree, etc.). What is a good design for this sort of ML/AI framework?

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• A detail question when applying genetic algorithm to traveling salesman

  - by burrough

  I read various stuff on this and understand the principle and concepts involved, however, none of paper mentions the details of how to calculate the fitness of a chromosome (which represents a route) involving adjacent cities (in the chromosome) that are not directly connected by an edge (in the graph). For example, given a chromosome 1|3|2|8|4|5|6|7, in which each gene represents the index of a city on the graph/map, how do we calculate its fitness (i.e. the total sum of distances traveled) if, say, there is no direct edge/link between city 2 and 8. Do we follow some sort of greedy algorithm to work out a route between 2 and 8, and add the distance of this route to the total? This problem seems pretty common when applying GA to TSP. Anyone who's done it before please share your experience. Thanks.

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• Integrating my website with BlogEngine.Net

  - by Kabeer

  Hello. I am developing a site (ASP.Net based) that, besides other features enables the users to blog as well. I am thinking of integrating BlogEngine.Net to my portal. From whatever little I have analyzed, integrating at presentation layer will be far more challenging in comparison to doing so at business layer. That means (I guess) I will have to use the BlogEngine.Core.dll in my application. I am looking for some sort of approval from the community, complimented with suggested do's and dont's. BTW, I find the business layer a bit intimidating (complex) as I want some basic & necessary features only.

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• 301 htaccess redirect: add segment to old URL's

  - by Rick

  I'm trying to make sure old url's aren't broken after the site's URL structure has changed from this: http://www.domain.com/section/entry_name to this: http://www.domain.com/section/event_name/entry_name But to make it a bit more complex, I'm using the segments to sort entries, for example: http://www.domain.com/news/amazing_event/date/asc http://www.domain.com/videos/my_event/title/desc The new structure only effects one particular event (amazing_event) and should leave the other URL's alone. Where do I even begin to tackle this? My current .htaccess looks like: RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /index.php/$1 [L] Thanks - appreciate any tips.

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• Getting Started with UDK

  - by Sean Edwards

  I've been trying for a couple of days now to learn UDK, but I seem to be stuck at making that leap to understanding how everything works together. I understand the syntax, that's all well and good, and I pretty much get how classes and .ini files interact. As for the API, I have the entire reference as pretty decent Doxygen-style HTML output. What I'm looking for is a sort of intermediate tutorial on game creation from scratch (as opposed to modding UT3 itself), more advanced than just learning language syntax, but not yet to the level of going through the API step by step. I'm looking for some guide to the structure of the internals - how GameInfo and PlayerController interact, where Pawn comes in, etc. - a way to visualize the big picture. Does anyone have a particular favorite intermediate-level tutorials (or set of tutorials) that they used when first learning UDK?

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• Python: Random is barely random at all?

  - by orokusaki

  I did this to test the randomness of randint: >>> from random import randint >>> >>> uniques = [] >>> for i in range(4500): # You can see I optimistic. ... x = randint(500, 5000) ... if x in uniques: ... raise Exception('We duped ' + str(x) + ' at iteration number ' + str(i)) ... uniques.append(x) ... Traceback (most recent call last): File "(stdin)", line 4, in (module) Exception: 'We duped 4061 at iteration number 67 I tried about 10 times more and the best result I got was 121 iterations before a repeater. Is this the best sort of result you can get from the standard library?

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• LINQ list of sublist

  - by Nelson

  I'm trying to get all the sublists that don't inherit from a specified class and also get the parent/root list type. I can't quite figure out the syntax. Here's an example of the sort of thing I'm looking for. Thanks for any help you can give! public class Foo { public IList<Type> Bar { get; private set; } } List<Foo> test = new List<Foo>(); // Initialize, add values, etc. var result = from f in test from b in f.Bar where !b.IsSubclassOf(typeof(AnotherClass)) select f.GetType(), b

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• Box2d: Maximum possible linear velocity?

  - by Rosarch

  I think I've configured Box2d to have some sort of maximum velocity for any body, but I'm not sure. I apply an impulse like (100000000, 100000000), and the body moves just as fast as (100, 100) - which is not that fast at all. My game is a top-down 2d. Here is some code that may be relevant: private readonly Vector2 GRAVITY = new Vector2(0, 0); public void initializePhysics(ContactReporter contactReporter) { world = new World(GRAVITY, true); IContactListener contactListener = contactReporter; world.ContactListener = contactListener; } public void Update(GameTime gameTime) { // ... worldState.PhysicsWorld.Step((float)gameTime.ElapsedGameTime.TotalSeconds, 10, 10); //... }

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• wcf data service security configuration

  - by Daniel Pratt

  I'm in the process of setting up a WCF Data Services web service and I'm trying to sort out the security configuration. Although there's quite a lot of documentation out there for configuring WCF security, a lot of it seems to be outmoded or does not apply to my scenario. Ultimately, I am planning on managing authorization of operations via change interceptors. Thus, all I really need is the simplest way to permit a client to pass credentials along with a request and to be able to authenticate those credentials against either AD or an ASP.NET membership provider (I'd much prefer the latter unless it makes things much more complicated). I'm intending to manage encryption at the transport level (i.e. HTTPS). I'm hoping that the eventual solution does not involve a huge web.config. Likewise, I'd much prefer to avoid writing custom code for the purpose of authentication.

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• Silverlight RIA Services. Query fails on large table but works with Where clause

  - by FauxReal

  I have a somewhat large table, maybe 2000 rows by 50 columns. When using the most basic imaginable RIA implementation. Create one-table Model Create DomainService Drop datagrid onto MainPage.xaml Drop datasource onto datagrid Ctrl-F5 I get this error: System.ServiceModel.DomainServices.Client.DomainOperationException: Load operation faild for query. Value cannot be null. Error is much larger, but thats the beginning of it. The weird thing is that if I narrow the results down with a where clause on the GetQuery, it works fine. In fact six different querys which together result in all of the rows being called works fine also. So basically, I'm sure its not some sort of rogue row. Why do I get this "Value cannot be null" error if I query the whole table? Thanks

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• Streaming input to System.Speech.Recognition.SpeechRecognitionEngine

  - by spurserh

  I am trying to do "streaming" speech recognition in C# from a TCP socket. The problem I am having is that SpeechRecognitionEngine.SetInputToAudioStream() seems to require a Stream of a defined length which can seek. Right now the only way I can think to make this work is to repeatedly run the recognizer on a MemoryStream as more input comes in. Here's some code to illustrate: SpeechRecognitionEngine appRecognizer = new SpeechRecognitionEngine(); System.Speech.AudioFormat.SpeechAudioFormatInfo formatInfo = new System.Speech.AudioFormat.SpeechAudioFormatInfo(8000, System.Speech.AudioFormat.AudioBitsPerSample.Sixteen, System.Speech.AudioFormat.AudioChannel.Mono); NetworkStream stream = new NetworkStream(socket,true); appRecognizer.SetInputToAudioStream(stream, formatInfo); // At the line above a "NotSupportedException" complaining that "This stream does not support seek operations." Does anyone know how to get around this? It must support streaming input of some sort, since it works fine with the microphone using SetInputToDefaultAudioDevice(). Thanks, Sean

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• GetWindowPlacement/SetWindowPlacement not working in WinForms for high DPI

  - by RandomEngy

  I've got a legacy WinForms app and I want to save the window position and size across sessions. I've been using GetWindowPlacement and SetWindowPlacement during the FormClosing and Load events. The problem I'm getting is that at higher DPI settings (Such as Medium, size at 125%) the sizes keep inflating. I'll call SetWindowPlacement on it with a certain size, but when GetWindowPlacement is called, those numbers come back 25% bigger, even though the window was the same size all along. The same sort of problem exists when saving the size of a resizable element within the form. Now this works fine if I create a new WinForms project: The size stays stable even when running at the higher DPI. I'm guessing there's some legacy setting in the bowels of the project or some arcane Form setting that's messing it up, but I can't find out where. I've called IsProcessDPIAware on both projects and both are true. Does anyone know what might be causing this?

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• Catching OutOfMemoryError

  - by dotsid

  Documentation for java.lang.Error says: An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch But as java.lang.Error is subclass of java.lang.Throwable I can catch this type of throwable. I understand why this is not good idea to catch this sort of exceptions. As far as I understand, if we decide to caught it, the catch handler should not allocate any memory by itself. Otherwise OutOfMemoryError will be thrown again. So, my question is: is there any real word scenarios when catching java.lang.OutOfMemoryError may be a good idea? if we catching java.lang.OutOfMemoryError how can we sure that catch handler doesn't allocate any memory by itself (any tools or best practicies)? Thanks a lot.

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• WPF assign Z-Order of owned windows without changing focus.

  - by Kamiikoneko

  Hi, Due to OpenGL airspace issues I have several windows that are owned by the main window but look and act like controls. I also have some data readout/sort windows that show real-time data and need to be normal floating windows, also owned by the main window so that they remain floating above the main window even while operations are performed in the main window. The issue: I open a data readout window (normal window) and am watching data change. Then I click on a text box to enter a value in one of the windows that acts as a control due to airspace issues, and it becomes activated, covering up my data readout window. This is bad because the airspace window is supposed to act like it is part of the main window. I tried some tricks with Activation and Deactivation, and it looks ok but then editing the airspace window at all is impossible because WPF only lets me edit the activated window. How can I ask that normal data readout window to please stay above all other windows owned by the main window, but still let other windows receive focus?

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• Are there alternatives to UltraWinGrid (for C#)?

  - by MPelletier

  I've been using the Infragistics UltraWinGrid for a while in a C# project, and while it's very spiffy, it is sometimes a bit heavy to run (and editing it in Visual Studio can be hazardous). I'm looking for a lighter alternative. Looks (always a big plus with Infragistics) are not as important as functionality. Namely, I'm looking for a beefed up DataGridView which: has data binding (duh!) has lock control over editing allows for sub-tables on opening a row can have multiple headers to group columns together (say header 1 is composed of "Group A" and "Group B", and header 2 has various columns under each group) has sorting by column (and can sort numbers properly, even if it does not have a stock method at first) has filtering by column (perhaps the most demanding spec) à la UltraWinGrid/Excel (text field with a way to specify if the filter is equal, not equal, greater, lesser, starts with, ends with, etc). supports check box, text box or data bound list/combo box cells allows cells to be merged (not the control cells of course!) can have events bound to each row (say double click)

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• JavaScript tree / treegrid libraries

  - by desau

  I'm looking for a good JavaScript tree / treegrid package. Now -- before you answer: It needs to be able to perform well with lots of nodes. Perhaps 1,000 sibling nodes. It needs to be able to draw to a usable state within 2 or 3 seconds with 1,000 nodes. It doesn't necessarily need to draw all 1,000 nodes at once -- if it supports some sort of "smart rendering" or fake scrolling. Beyond that, column resizing, drag and drop, inline editing would all be nice, although I could probably add that functionality myself. I've already tried dojo's tree and yahoo's YUI treeview. Both are too slow.

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