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• Thread safe lockfree mutual ByteArray queue

  - by user313421

  A byte stream should be transferred and there is one producer thread and a consumer one. Speed of producer is higher than consumer most of the time, and I need enough buffered data for QoS of my application. I read about my problem and there are solutions like shared buffer, PipeStream .NET class ... This class is going to be instantiated many times on server so I need and optimized solution. Is it good idea to use a Queue of ByteArray ? If yes, I'll use an optimization algorithm to guess the Queue size and each ByteArray capacity and theoretically it fits my case. If no, I what's the best approach ? Please let me know if there's a good lock free thread safe implementation of ByteArray Queue in C# or VB. Thanks in advance

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• Is it Pythonic to have a class keep track of its instances?

  - by Lightbreeze

  Take the following code snippet class Missile: instances = [] def __init__(self): Missile.instances.append(self) Now take the code: class Hero(): ... def fire(self): Missile() When the hero fires, a missile needs to be created and appended to the main list. Thus the hero object needs to reference the list when it fires. Here are a few solutions, although I'm sure there are others: Make the list a global, Use a class variable (as above), or Have the hero object hold a reference to the list. I didn't post this on gamedev because my question is actually more general: Is the previous code considered okay? Given a situation like this, is there a more Pythonic solution?

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• Hiding a value in an Android application

  - by Ewan

  Hi, I need to hide a value in a mobile (Android OS) application. As far as I can see, encrypting the value is of no use as the key to the encryption mechanism must be available to the program and is thus available to an attacker reverse-engineering the code. So, it seems that the only "solution" is to hide the secret value in the application as well as possible, obviously not ideal. Any comments? Am I missing something? If not, what's the best way to hide the value? Thanks for your ideas! Ewan

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• How to make enemies?

  - by Meko

  Hi..I made shoot em up like game.But I have only one ememy which fallows me on screen.But I want to make lots of enemys like each 10 second they will across on screen together 5 or 10 enemys. ArrayList<Enemies> enemy = new ArrayList<Enemies>(); for (Enemies e : enemy) { e.draw(g); } is it good creating array list and then showing on screen? And Do I have to make some planing movements thoose enemies in my code ? I want that they vill appear not on same pozition.Like First 5 enemies will come top of screen then the other 5 or 10 enemies will come from left side.. so on.What is best solution for this?

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• Tracking a Flash banner advert using clickTag and Google Analytics

  - by alistair.mp

  Hello. I'm trying to find out if there is a way of using clickTag and Google Analytics to track outgoing banner clicks. clickTag code: on (release) { if (clickTAG.substr(0,5) == "http:") { getURL(clickTAG); } } Maybe someone can tell me whether the following would work: on (release) { if (clickTAG.substr(0,5) == "http:") { getURL("javascript:pageTracker._trackPageview('/somebannerad');"); getURL(clickTAG); } } but I would ideally like a solution that worked with the standard clickTag code and didn't involve changing any code in the flash file. Anyone have any ideas? Thanks

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• Django and conditional aggregates

  - by piquadrat

  I have two models, authors and articles: class Author(models.Model): name = models.CharField('name', max_length=100) class Article(models.Model) title = models.CharField('title', max_length=100) pubdate = models.DateTimeField('publication date') authors = models.ManyToManyField(Author) Now I want to select all authors and annotate them with their respective article count. That's a piece of cake with Django's aggregates. Problem is, it should only count the articles that are already published. According to ticket 11305 in the Django ticket tracker, this is not yet possible. I tried to use the CountIf annotation mentioned in that ticket, but it doesn't quote the datetime string and doesn't make all the joins it would need. So, what's the best solution, other than writing custom SQL?

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• My ASP.NET Web Application cannot 'find' any of my classes in the App_Code folder .. ??

  - by Pure.Krome

  Hi folks, I'm trying to make a new asp.net web application .. so I'm copying my files from one site to the new one, in the same solution. Now, any of my classes in the App_Code directory ... they are not getting 'picked up' by the rest of my project. For example... \_ \_App_Code |_ BaseMasterPage.cs (please don't ask why this is in here..) |_ Utility.cs |_ FooBar.cs \_MasterPages |_ Default.master.cs // This file errors ;( namespace Foo.WebSite.MasterPages { public partial class Default_master : App_Code.BaseMasterPage { ... } } namespace Foo.WebSite.App_Code { public class BaseMasterPage : MasterPage { .. } } It cannot find the App_Code.BaseMasterPage (compilation and intellisence error) in the Default.master.cs page. Can someone please help? this is killing me :(

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• What's the best way to calculate similarity between rows in a table based on association?

  - by André Pena

  Suppose each Person has a collection of favorite Books. So I have a table for: Person Book The association between Person and Book (joint table for MxN) I want to fetch the Persons that are similar to a Person1 based on the favorite Books overlaping. That is: The more books they have in common, the more they are similar. I don't have to use only SQL to solve this problem. I could use programming also. I'm using SQL Server 2008 and C#. What solution would you experts use?

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• Why can I not deploy my ear on Glassfish

  - by hexin

  I have standard maven project in netbeans (netbeans' enterprise application), that have 1 war, 1 ejb and 1 ear modules. I want to inject with @Inject my @Stateless from ejb to war (REST class) using its interface. I have added some beans.xml files in correct folders in project, but im still getting this: Error occurred during deployment: Exception while loading the app : WELD-001409 Ambiguous dependencies for type [LogicBean] with qualifiers [@Default] at injection point [[field] @Inject private pl.edu.amu.wmi.kino.rk.rest.ReportRest.bean]. Possible dependencies [[Session bean [class pl.edu.amu.wmi.kino.rk.data.impl.LogicBeanImpl with qualifiers [@Any @Default]; local interfaces are [LogicBean], Session bean [class pl.edu.amu.wmi.kino.rk.data.impl.LogicBeanImpl with qualifiers [@Any @Default]; local interfaces are [LogicBean]]]. Please see server.log for more details. What am i doing wrong? I have searched the whole internet, but could not find the solution. I know it is possible because i worked on a project with such a staff. THX for any help:)

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• Efficient JSON encoding for data that may be binary, but is often text

  - by Evgeny

  I need to send a JSON packet across the wire with the contents of an arbitrary file. This may be a binary file (like a ZIP file), but most often it will be plain ASCII text. I'm currently using base64 encoding, which handles all files, but it increases the size of the data significantly - even if the file is ASCII to begin with. Is there a more efficient way I can encode the data, other than manually checking for any non-ASCII characters and then deciding whether or not to base64-encode it? I'm currently writing this in Python, but will probably need to do the same in Java, C# and C++, so an easily portable solution would be preferable.

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• Python GUI Scraper hanging issues.

  - by bball

  I wrote a scraper using python a while back, and it worked fine in the command line. I have made a GUI for the application now, but I am having trouble with one issue. When I attempt to update text inside the gui (e.g. 'fetching URL 12/50'), I am unable seeing as the function within the scraper is grabbing 100+ links. Also when going from one scraping function, to a function that should update the gui, to another function, the gui update function seems to be skipped over while the next scrape function is run. An example would be: scrapeLinksA() #takes 20 seconds updateInfo("LinksA done") scrapeLinksB() #takes another 20 seconds in the above example, updateInfo is never executed, unless I end the program with a KeyboardInterrupt. I'm thinking my solution is threading, but I'm not sure. What can I do to fix this? I am using: PyQt4 urllib2 BeautifulSoup

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• Intercept and ignore keyboard event in Windows 7 32bit

  - by Sg2010

  Hi all, My hardware has a problem, from time to time it's sending a "keydown" followed by a "keyup" of event: keydown: None LButton, OemClear 255 keyup: None LButton, OemClear 255 keydown: None LButton, OemClear 255 keyup: None LButton, OemClear 255 It goes like this forever, in Windows. In general it doesn't affect most of the applications, because this key is not printable. I think it's a special function key, like a media key or something. It doesn't do anything. But, in some applications that LISTEN to keydown and keyup, I get undesire and unexpected behaviour. Is there a way to intercept these 2 events in Windows (for all applications, for Windows itself) and make the OS ignore them? This is really important to me, if you can think of any solution, I'd be forever thankful.

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• Is it possible to get code coverage data for a GWT web app running tests from the web browser?

  - by jeff

  I am not sure if this is possible but I would like some way to get code coverage information for tests that are written in Quick Test for our GWT based web app. It does not seem like there is any solution because the Quick Test Pro tests are testing against the GWT compiled app and not the original java code in which the app was written. I suppose I could get coverage data on the javascript that the GWT compiler creates, but there would be no way for me (that I know of) to map this information back to the original java code. Is there some way to do this?

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• Use trackball for scrolling in Android ListView

  - by gartenkralleb

  hi, i have a ListView, whose content should not be selectable. i set the ListView to choiceMode="none" and set a transparent listSelector. for touch mode it acts as desired. a problem is the use of the trackball. if i try to use it for scrolling, the scroll starts after the 10th push to "down". this is caused by the invisible listSelector, which scrolls down the list until the 10th list item is "invisibily" selected. i try to override dispatchTrackballEvent and do the scrolling with scrollBy, but i did not finished this approach yet, to have a look on alternative suggestions. is there a simple solution for my problem?

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• How do you draw a line from one corner of the stage to the other?

  - by George Edison

  I am completely perplexed. I asked this question and it (any mentioned solution) doesn't seem to be working at all. All I want is to draw a line from one corner to the other. Here again is the link to the SWF file I have (it's embedded in an HTML document): test.html Here is the source: package { import flash.display.Sprite; import flash.events.Event; public class Main extends Sprite { public function Main():void { if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE, init); } private function init(e:Event = null):void { removeEventListener(Event.ADDED_TO_STAGE, init); // entry point graphics.clear(); graphics.lineStyle(10, 0x000000); graphics.moveTo(0, 0); graphics.lineTo(stage.stageWidth, stage.stageHeight); } } } It just doesn't work! The line goes from somewhere offscreen to about the middle of the stage. What on earth am I doing wrong?

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• What is the proper way to resolve Eclipse warning "isn't parameterized"?

  - by Morinar

  I'm trying to clean up some warnings in some old Java code (in Eclipse), and I'm unsure what the proper thing to do is in this case. The block looks more or less like this: Transferable content = getToolkit().getSystemClipboard().getContents( null ); java.util.List clipboardFileList = null; if( content.isDataFlavorSupported( DataFlavor.javaFileListFlavor ) ) { try { clipboardFileList = (java.util.List)content.getTransferData( DataFlavor.javaFileListFlavor); } /* Do other crap, etc. */ } The List generates a warning as it isn't parameterized, however, if I parameterize it with <File>, which I'm pretty sure is what it requires, it complains that it can't convert from Object to List<File>. I could merely suppress the unchecked warning for the function, but would prefer to avoid that if there is a "good" solution. Thoughts?

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• Trouble with using ActiveX control in .net windows application

  - by alex dee

  C#, visual studio 2005 I have several 3rd party activeX control. I need to use them in my .net windows application. These controls are graphical. I created a wrapper with aximp.exe for them. But it seems that something wrong. When I call some methods of wrapped activeX control == targetinvocativeexception occured. Or visual studio writes "you are attempting to write or read protected memory". I know that something wrong. But what is exactly wrong - i don't know. I find out about method CreateControl() or STAthread attribute. but it doesn't help me. What is the common problem and common solution for my type of problem ? These activex control from big and trusted company, other developers work with them.

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• ASP.NET MVC AuthorizeAttribute passing values to ActionMethod?

  - by subskii

  Hi everyone I'm only a newcomer to ASP.NET MVC and am not sure how to achieve a certain task the "right way". Essentially, I store the logged in userId in HttpContext.User.Identity and have written an EnhancedAuthorizeAttribute to perform some custom authorization. In the overriden OnAuthorization method, my domain model hits the database to ensure the current user id can access the passed in routeValue "BatchCode". The prototype is: ReviewGroup GetReviewGroupFromBatchCode(string batchCode); It will return null if the user can't access the ReviewGroup and the OnAuthorization then denies access. Now, I know the decorated action method will only get executed if OnAuthorization passes, but I don't want to hit the database a second time to get the ReviewGroup again. I am thinking of storing the ReviewGroup in HttpContext.Items["reviewGroup"] and accessing this from the controller at the moment. Is this a feasible solution, or am I on the wrong path? Thanks!

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• network drive file sharing

  - by Linc

  For the better part of 10 years + we have relied on various network mapped drives to allow file sharing. One drive letter for sharing files between teams, a seperate file share for the entire organization, a third for personal use etc. I would like to move away from this and am trying to decide if an ECM/Sharepoint type solution, or home grown app, is worth the cost and the way to go? Or if we should simply remain relying on login scripts/mapped drives for file sharing due to its relative simplicity? Does anyone have any exeperience within their own organization or thoughts on this? Thanks.

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• WPF: Bind/Apply Filter on Boolean Property

  - by Julian Lettner

  I want to apply a filter to a ListBox accordingly to the IsSelected property of a CheckBox. At the moment I have something like this. XAML <CheckBox Name="_filterCheckBox" Content="Filter list" Checked="ApplyFilterHandler"/> <ListBox ItemsSource="{Binding SomeItems}" /> CodeBehind public ObservableCollection<string> SomeItems { get; private set; } private void ApplyFilterHandler(object sender, RoutedEventArgs e) { if (_filterCheckBox.IsChecked.Value) CollectionViewSource.GetDefaultView(SomeItems).Filter += MyFilter; else CollectionViewSource.GetDefaultView(SomeItems).Filter -= MyFilter; } private bool MyFilter(object obj) { return ... } It works but this solution feels like the old-fashioned way (Windows Forms). Question: Is it possible to achieve this with Bindings / in XAML? Thanks for your time.

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• window.focus() not working in firefox

  - by Nisanth

  Hi all i am developing a chat application ... i have multiple chat windows ... i want to know which windw contain new message ... i have the following code .. function getCount() { $.ajax({ type: "POST", url: baseUrl + '/Chat/count', data: "chat_id=" + document.ajax.chat_id.value, success: function(msg){ if(msg == 'new1') { self.focus(); } } }); } This code is work fine with IE but not in firefox...please give me a solution... the above code is in the same html

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• reference other projects in visual studio for win32 projects

  - by Vineel Kumar Reddy

  Hi All I am working with win32 API and my language of choice is pure C and no C++. Assume I have a project A that is present in Solution S in visual studio I want to add another project B(which has some common utility functions) in to S Now I want to reference Project B in Project A... So that I can use those utility functions from Project B source code level. I dont want it be used against dll of Project B assume project B contains some math related functions and i want to call the functions from Project A or project B contains come data structures and i want to make use of them in Project A How to achieve this.... thanks in advance

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• Compound dictionary keys

  - by John Keyes

  I have a particular case where using compound dictionary keys would make a task easier. I have a working solution, but feel it is inelegant. How would you do it? context = { 'database': { 'port': 9990, 'users': ['number2', 'dr_evil'] }, 'admins': ['[email protected]', '[email protected]'], 'domain.name': 'virtucon.com' } def getitem(key, context): if hasattr(key, 'upper') and key in context: return context[key] keys = key if hasattr(key, 'pop') else key.split('.') k = keys.pop(0) if keys: try: return getitem(keys, context[k]) except KeyError, e: raise KeyError(key) if hasattr(context, 'count'): k = int(k) return context[k] if __name__ == "__main__": print getitem('database', context) print getitem('database.port', context) print getitem('database.users.0', context) print getitem('admins', context) print getitem('domain.name', context) try: getitem('database.nosuchkey', context) except KeyError, e: print "Error:", e Thanks.

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• How do I ensure that SOAP requests from a flash client to my ASP server are coming from the flash cl

  - by Gary Benade

  I have a flash based game that has a high score system implemented with a SOAP service. There are prizes involved and I want to prevent someone from using FireBug or similar to discover the webservice path and submit fake scores. I considered using some kind of encryption on the data but am aware that someone could decompile the swf and work out how I did it. I also considered using an IP whitelist but since the incoming data will come from the users IP and not the servers that won't work. (I'm sure I'm missing something obvious here...) I know that there is a tried and tested solution for this, but I don't seem to be asking google the right questions to get to it. Any help and suggestions will be appreciated, thank you

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• Ctrl+Click / Command+Click not working with analytics

  - by user347998

  Hi All, I created my own analytics for my site to track outbound click events using jquery. Now the thing with preventDefault() is that it does not allow for the Ctrl+Click or COmmand+click operation in the browser to open the link in new tab/window. So my solution was to detect e.metaKey || e.ctrlKey and use window.open. This does not work very great with safari unless the user changes browser behavior. I am wondering if anyone here knows what other analytics users do - like how does google etc deal with this problem in tracking outbound links? From this link: http://www.google.com/support/googleanalytics/bin/answer.py?hl=en&answer=55527 - looks like google will also face the same problem. Thoughts?

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