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• Is it possible to implement an infinite IEnumerable without using yield with only C# code?

  - by sinelaw

  Edit: Apparently off topic...moving to Programmers.StackExchange.com. This isn't a practical problem, it's more of a riddle. Problem I'm curious to know if there's a way to implement something equivalent to the following, but without using yield: IEnumerable<T> Infinite<T>() { while (true) { yield return default(T); } } Rules You can't use the yield keyword Use only C# itself directly - no IL code, no constructing dynamic assemblies etc. You can only use the basic .NET lib (only mscorlib.dll, System.Core.dll? not sure what else to include). However if you find a solution with some of the other .NET assemblies (WPF?!), I'm also interested. Don't implement IEnumerable or IEnumerator. Notes The closest I've come yet: IEnumerable<int> infinite = null; infinite = new int[1].SelectMany(x => new int[1].Concat(infinite)); This is "correct" but hits a StackOverflowException after 14399 iterations through the enumerable (not quite infinite). I'm thinking there might be no way to do this due to the CLR's lack of tail recursion optimization. A proof would be nice :)

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• Implementing commands in MMVM

  - by user312372

  I am trying to change the source property of the frame in Page1.xaml when the SampleCommand is excecuted. How do I acheive this in the View Model? Page1.xaml: <Page ...> <DockPanel> <r:ribbon> <r:RibbonTab Label="Keys"> <r:RibbonTab.Groups> <r:RibbonGroup GroupSizeDefinitions="{StaticResource RibbonLayout}"> <r:RibbonGroup.Command> <r:RibbonCommand LabelTitle="RibbonButton"/> </r:RibbonGroup.Command> <r:RibbonButton x:Name="RibbonButton1" Command="{Binding Path=SampleCommand}"/> </r:RibbonGroup> </r:RibbonTab.Groups> </r:RibbonTab> </r:Ribbon> <Border Name="PageBorder" Grid.Row="0" Grid.Column="1"> <Frame Name="pageFrame" Source="FirstPage.xaml" /> </Border> </DockPanel> </Page> Page1ViewModel.cs: RelayCommand _sampleCommand; public ICommand SampleCommand { get { // create command ?? return _sampleCommand } } page1.xaml.cs: Page1ViewModel pageViewModel; //When page loads this.DataContext = pageViewModel;

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• NSString sizeWithFont: returning inconsistent results? known bug?

  - by Olof Hedman

  I'm trying to create a simple custom UIView wich contain a string drawn with a single font, but where the first character is slightly larger. I thought this would be easily implemented with two UILabel:s placed next to eachother. I use NSString sizeWithFont to measure my string to be able to lay it out correctly. But I noticed that the font baseline in the returned rectangle varies with +/- 1 pixel depending on the font size I set. Here is my code: NSString* ctxt = [text substringToIndex:1]; NSString* ttxt = [text substringFromIndex:1]; CGSize sz = [ctxt sizeWithFont: cfont ]; clbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, sz.width, sz.height)]; clbl.text = ctxt; clbl.font = cfont; clbl.backgroundColor = [UIColor clearColor]; [contentView addSubview:clbl]; CGSize sz2 = [ttxt sizeWithFont: tfont]; tlbl = [[UILabel alloc] initWithFrame:CGRectMake(sz.width, (sz.height - sz2.height), sz2.width, sz2.height)]; tlbl.text = ttxt; tlbl.font = tfont; tlbl.backgroundColor = [UIColor clearColor]; [contentView addSubview:tlbl]; If I use 12.0 and 14.0 as sizes, it works fine. But if I instead use 13.0 and 15.0, then the first character is 1 pixel too high. Is this a known problem? Any suggestions how to work around it? Creating a UIWebView with a CSS and HTML page seems way overkill for this. and more work to handle dynamic strings. Is that what I'm expected to do?

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• How to set focus to a brand new TextBox which was created as a result of a databinding in WPF?

  - by Mike

  Hi everyone, I have a WPF ItemsControl that is bound to an ObservableCollection. The XAML: <ItemsControl Name="mItemsControl"> <ItemsControl.ItemTemplate> <DataTemplate> <TextBox Text="{Binding Mode=OneWay}"></TextBox> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> The codebehind: private ObservableCollection<string> mCollection = new ObservableCollection<string>(); public MainWindow() { InitializeComponent(); this.mCollection.Add("Test1"); this.mCollection.Add("Test2"); this.mItemsControl.ItemsSource = this.mCollection; } private void Button_Click(object sender, RoutedEventArgs e) { this.mCollection.Add("new item!"); } When I click a button, it adds a new string to the databound ObservableCollection which triggers a new TextBox to appear. I want to give this new textbox focus. I've tried this technique from a related StackOverflow question but it always sets focus to the textbox before the newly created one. private void Button_Click(object sender, RoutedEventArgs e) { this.mCollection.Add("new item!"); // MoveFocus takes a TraversalRequest as its argument. TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Previous); // Gets the element with keyboard focus. UIElement elementWithFocus = Keyboard.FocusedElement as UIElement; // Change keyboard focus. if (elementWithFocus != null) { elementWithFocus.MoveFocus(request); } } My need seems simple enough, but it's almost like the new textbox doesn't really exist until a slight delay after something is added to the ObservableCollection. Any ideas of what would work? Thanks! -Mike

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• Changing URI suffix in Joomla when adding child php pages

  - by Sleem

  I have added a new directory in my joomla website: http://sitedomain.tld/xxx/ then I have added index.php in that directory here is the code define( '_JEXEC', 1 ); define('JPATH_BASE', '..' ); define( 'DS', DIRECTORY_SEPARATOR ); require_once ( '../includes/defines.php' ); require_once ( '../includes/framework.php' ); //JDEBUG ? $_PROFILER->mark( 'afterLoad' ) : null; /** * CREATE THE APPLICATION * * NOTE : */ $mainframe =& JFactory::getApplication('site'); $template_name = $mainframe->getTemplate();; $mainframe->initialise(); JPluginHelper::importPlugin('system'); /** * ROUTE THE APPLICATION * * NOTE : */ $mainframe->route(); // authorization $Itemid = JRequest::getInt( 'Itemid'); $mainframe->authorize($Itemid); // trigger the onAfterRoute events //JDEBUG ? $_PROFILER->mark('afterRoute') : null; //$mainframe->triggerEvent('onAfterRoute'); /** * DISPATCH THE APPLICATION * * NOTE : */ $option = JRequest::getCmd('option'); //$mainframe->dispatch($option); // trigger the onAfterDispatch events //JDEBUG ? $_PROFILER->mark('afterDispatch') : null; //$mainframe->triggerEvent('onAfterDispatch'); /** * RENDER THE APPLICATION * * NOTE : */ $mainframe->render(); /** * RETURN THE RESPONSE */ var_dump($document->getHeadData()); echo JResponse::toString($mainframe->getCfg('gzip')); sdwdwd wdwd When I view this page in the browser, all the dynamic links like CSS, JS and images were suffixed by the /xxx/ path which make them broken ! How can I drop this suffix or how do I change this suffix from /xxx to / to it points to the original files location? I have tried setting the JDocument::setBase and also tried to play with the JURI object and changed its _path and _uri without any change Thanks

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• fixed layout in formview template

  - by Jeroen

  I have n pages with formviews, all sharing a similar layout inside their item/edit/insert templates. For example all item and edit templates have a header and body part inside where i put the fields. The header has a certain style and the body part too. My question is how can i enforce this style in all my formviews without repeating the same bulk css styles all the time. Now i'm using masterpages for this with multiple formviews on 1 page. That's not good i think. I want one 1 page for edit/insert/item and 1 formview. I would prefer somehow to define the style for edit template once and load it into every formview. Ofcourse not all the formviews have the same fields, so like masterpages i would like to have 'areas' where i can put my fields. The perfect way i suppose would be to have a formview span a complete masterpage based page including the contentplaceholders inside it's edit/insert/item templates. Any ideas are more than welcome. Edit: I read it's possible in .Net 4 using dynamic data. I'm stuck with 3.5 for the moment.

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• SQL - Converting 24-hour ("military") time (2145) to "AM/PM time" (9:45 pm)

  - by CheeseConQueso

  I have 2 fields I'm working with that are stored as smallint military structured times. Edit I'm running on IBM Informix Dynamic Server Version 10.00.FC9 beg_tm and end_tm Sample values beg_tm 545 end_tm 815 beg_tm 1245 end_tm 1330 Sample output beg_tm 5:45 am end_tm 8:15 am beg_tm 12:45 pm end_tm 1:30 pm I had this working in Perl, but I'm looking for a way to do it with SQL and case statements. Is this even possible? EDIT Essentially, this formatting has to be used in an ACE report. I couldn't find a way to format it within the output section using simple blocks of if(beg_tm>=1300) then beg_tm = vbeg_tm - 1200 Where vbeg_tm is a declared char(4) variable EDIT This works for hours =1300 (EXCEPT FOR 2230 !!) select substr((beg_tm-1200),0,1)||":"||substr((beg_tm-1200),2,2) from mtg_rec where beg_tm>=1300; This works for hours < 1200 (sometimes.... 10:40 is failing) select substr((mtg_rec.beg_tm),0,(length(cast(beg_tm as varchar(4)))-2))||":"||(substr((mtg_rec.beg_tm),2,2))||" am" beg_tm from mtg_rec where mtg_no = 1; EDIT Variation of casting syntax used in Jonathan Leffler's expression approach SELECT beg_tm, cast((MOD(beg_tm/100 + 11, 12) + 1) as VARCHAR(2)) || ':' || SUBSTRING(cast((MOD(beg_tm, 100) + 100) as CHAR(3)) FROM 2) || SUBSTRING(' am pm' FROM (MOD(cast((beg_tm/1200) as INT), 2) * 3) + 1 FOR 3), end_tm, cast((MOD(end_tm/100 + 11, 12) + 1) as VARCHAR(2)) || ':' || SUBSTRING(cast((MOD(end_tm, 100) + 100) as CHAR(3)) FROM 2) || SUBSTRING(' am pm' FROM (MOD(cast((end_tm/1200) as INT), 2) * 3) + 1 FOR 3) FROM mtg_rec where mtg_no = 39;

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• Help! I've learned jQuery... now I want to learn JavaScript

  - by Derek Adair

  I am a self-taught web developer/programmer. I started out about two years ago by learning how to make simple dynamic websites with HTML/CSS/PHP. Then I started dabbling with animation... Enter jQuery I've become quite proficient with jQuery over the last year and I've even started making my own plugins. I've spent most of my effort learning how to beautify websites with fancy effects and what not. Upon tackling my first full-blown application, I realized how under-developed my knowledge of JavaScript actually is. jQuery has allowed me to rely on its framework so heavily that I rarely use any interesting functions, techniques, or whatever that are 'native' to the JavaScript language. For example: I have a basic understanding of what a closure is... but I am unsure where this technique can actually benefit me. Although as I understand it, that's what my jQuery plugins do with (function ($){//plugin code here})(jQuery). I've seen many posts/blogs/whatever about memory leaks and circular references which is concerning. I'm frustrated because I can wrap my head around the basic concepts of what these are just by reading the articles, but I'm finding that the deeper I go the more I don't understand. The vocabulary alone is burdensome. Let alone how to actually use these techniques/functions/language features. I am trying to figure out what I don't know I'm looking to gather any advice, techniques, articles, books, videos, snippets, examples, potential pitfalls... really anything you have regarding application development with JavaScript/jQuery.

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• express+jade: provided local variable is undefined in view (node.js + express + jade)

  - by Jake

  Hello. I'm implementing a webapp using node.js and express, using the jade template engine. Templates render fine, and can access helpers and dynamic helpers, but not local variables other than the "body" local variable, which is provided by express and is available and defined in my layout.jade. This is some of the code: app.set ('view engine', 'jade'); app.get ("/test", function (req, res) { res.render ('test', { locals: { name: "jake" } }); }); and this is test.jade: p hello =name when I remove the second line (referencing name), the template renders correctly, showing the word "hello" in the web page. When I include the =name, it throws a ReferenceError: 500 ReferenceError: Jade:2 NaN. 'p hello' NaN. '=name' name is not defined NaN. 'p hello' NaN. '=name' I believe I'm following the jade and express examples exactly with respect to local variables. Am I doing something wrong, or could this be a bug in express or jade?

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• NoSuchMethodError: com/sun/istack/logging/Logger.getLogger

  - by pandi-sus

  I developed a webservice and deployed it to websphere 7.0 and developed a dynamic dispatch client using JAX-WS APIs which also runs on same application server. I get error at the following line: Dispatch dispatch = service.createDispatch(portName, SOAPMessage.class, Service.Mode.MESSAGE); Error: Caused by: java.lang.NoSuchMethodError: com/sun/istack/logging/Logger.getLogger(Ljava/lang/Class;)Lcom/sun/istack/logging/Logger; at com.sun.xml.ws.api.config.management.policy.ManagementAssertion.(ManagementAssertion.java:87) at java.lang.J9VMInternals.initializeImpl(Native Method) at java.lang.J9VMInternals.initialize(J9VMInternals.java:200) at java.lang.J9VMInternals.initialize(J9VMInternals.java:167) at com.sun.xml.ws.server.MonitorBase.createManagedObjectManager(MonitorBase.java:177) at com.sun.xml.ws.client.Stub.(Stub.java:196) at com.sun.xml.ws.client.Stub.(Stub.java:174) at com.sun.xml.ws.client.dispatch.DispatchImpl.(DispatchImpl.java:129) at com.sun.xml.ws.client.dispatch.SOAPMessageDispatch.(SOAPMessageDispatch.java:77) at com.sun.xml.ws.api.pipe.Stubs.createSAAJDispatch(Stubs.java:143) at com.sun.xml.ws.api.pipe.Stubs.createDispatch(Stubs.java:264) at com.sun.xml.ws.client.WSServiceDelegate.createDispatch(WSServiceDelegate.java:390) at com.sun.xml.ws.client.WSServiceDelegate.createDispatch(WSServiceDelegate.java:401) at com.sun.xml.ws.client.WSServiceDelegate.createDispatch(WSServiceDelegate.java:383) at javax.xml.ws.Service.createDispatch(Service.java:336) I included the following dependency. javax.xml.ws jaxws-api 2.1 I also tried adding policy dependency (versions - 2.2 and 2.2.1) com.sun.xml.ws policy 2.2.1 Any ideas on what more dependencies I need to add?

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• Extract <name> attribute from KML

  - by Ozaki

  I am using OpenLayers for a mapping service. In which I have several KML layers that are using KML feeds from server to populate data on the map. It currently plots: images / points / vector lines & shapes. But on these points it will not add a label with the value of the for the placemark in the KML. What I have currently tried is: ////////////////////KML Feed for * Layer// var surveylinelayer = new OpenLayers.Layer.Vector("First KML Layer", { projection: new OpenLayers.Projection("EPSG:4326"), strategies: [new OpenLayers.Strategy.Fixed()], protocol: new OpenLayers.Protocol.HTTP({ url: firstKMLURL, format: new OpenLayers.Format.KML({ extractStyles: true, extractAttributes: true }) }), styleMap: new OpenLayers.StyleMap({ "default": KMLStyle }) }); then the Style as follows: var KMLStyle = new OpenLayers.Style({ //label: "${name}", // This method will display nothing fillOpacity: 1, pointRadius: 10, fontColor: "#7E3C1C", fontSize: "13px", fontFamily: "Courier New, monospace", fontWeight: "strong", labelXOffset: "0", labelYOffset: "-15" }, { //dynamic label context: { label: function(feature) { return "Feature Name: " + feature.attributes.name; // also displays nothing } } }); Example of the KML: <Placemark> <name>POI1</name> <Style> <LabelStyle> <color>ffffffff</color> </LabelStyle> </Style> <Point> <coordinates>0.000,0.000</coordinates> </Point> </Placemark> When debugging I just hit "feature is undefined" and am unsure why it would be undefined in this instance?

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• Apache tomcat7 + couchdb in the same host

  - by demotics2002

  I couldn't find any guide on the internet about how to make them work together. I found some couchdb tutorials but they are mostly having the web pages hosted in couchdb's own webserver. My requirement: 1. Use tomcat 7 (or other versions) - i will be using jsp for the website. It has some features that require file upload and processing of files, file generation, and etc., that will require java. It also has admin console that will require the next item, 2. ExtJS (maybe V4) - I will be needing this in the admin console page for restful access to couchdb and other ui components (sorry but I am not considering jquery at the moment because I am already familiar with . 3. Couchdb - because the client needs a dynamic structure of data. Now my question is how to make tomcat and couchdb run on the same host (and port of course)? As much as possible I would like to avoid making my pages doing cross domain js calls. Worst case I may have to create a servlet that overrides put|get|post|delete that calls couchdb (either by using a driver or httpclient).

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• P6 Architecture - Register renaming aside, does the limited user registers result in more ops spent

  - by mrjoltcola

  I'm studying JIT design with regard to dynamic languages VM implementation. I haven't done much Assembly since the 8086/8088 days, just a little here or there, so be nice if I'm out of sorts. As I understand it, the x86 (IA-32) architecture still has the same basic limited register set today that it always did, but the internal register count has grown tremendously, but these internal registers are not generally available and are used with register renaming to achieve parallel pipelining of code that otherwise could not be parallelizable. I understand this optimization pretty well, but my feeling is, while these optimizations help in overall throughput and for parallel algorithms, the limited register set we are still stuck with results in more register spilling overhead such that if x86 had double, or quadruple the registers available to us, there may be significantly less push/pop opcodes in a typical instruction stream? Or are there other processor optmizations that also optimize this away that I am unaware of? Basically if I've a unit of code that has 4 registers to work with for integer work, but my unit has a dozen variables, I've got potentially a push/pop for every 2 or so instructions. Any references to studies, or better yet, personal experiences?

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• Is there a good tutorial for figuring out what a website is doing so your program can do the same th

  - by brian d foy

  Is there a good guide or tutorial for people who need to programmatically interact with dynamic websites? There's been a rash of Perl questions about that lately, and I haven't found a good resource to point people toward. I'm asking not because I need one but because I don't want to waste my time writing it if it already exists. Although I'm most interested in Perl, the extra tools and techniques are mostly the same. Typically, I see see these problems in people's questions: Handling, setting, and saving cookies Finding and interacting with forms Handling JavaScript inside your user-agent especially things like onLoad, onSumbit, and Ajax Using HTTP sniffer tools Using Web developer plugins in interactive browsers Interacting with DOM, screen scraping, etc. If there's no good tutorial, I'll add it to my list of things to do (unless someone else wants to do it :). Along the way, if you don't have a suggestion for an existing tutorial, please suggest the things that you think should be in a new one, including links, your favorite tools, and your own user-agent development experiences. I don't care about the particular language you use.

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• ajax delay load UserControl asp.net

  - by user196202

  regarding ajax delay load of usercontrols (or any controls) on Post at Encosia.com : http://encosia.com/2008/02/05/boost-aspnet-performance-with-deferred-content-loading/ I tried to implement it , but I noticed that it can be done only for simple controls or UserControls that Have simple asp.net controls (or html tags) . But when it involved with advanced dynamic ajax control (like ajaxControlToolkit or Telerik controls) that have javascripts inside them This method of injecting the html code to the .InnerHtml property of div tag (for example) IS NOT WORKING , and I red about it that The browser need to load the script on load and after that it won't iterperate the scripts injectd via .InnerHtml. So I attached here example of delay load project (from encosia.com by dave ward) with my modification (look at DefaultPopup.aspx and beforePopup.aspx and AfterPopup.aspx) Which I modified the RssReader to show listview with popup items (which is implemented via ACT HoverMenuExtender ) So in the regular way the popup items are shown right , but on the delay load which is done by creating virtual page for rendering the html and injecting it to .InnerHtml property – This ISN'T WORKING. So my question is : is there a way to do delay loading for controls which include scripts lik ACT and Telerik and others? And for the ajax templates – if I need to inject advanced control to the page – how I do it with your approach? Thanks very much (I can't attach here files so everyone please ask me by mail ([email protected]) and i'll send it to him. ) Zahi Kramer

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• Fck editor problem

  - by Josemalive

  Hi, Im using FCK Editor control instead a textarea element. I installed it without problems. But when i want to validate it with a Custom validator of ASP.Net 2.0, im not getting the result expected. These lines are the code that i have: <textarea style="width:30px;height:20px;" class="ckeditor" id="txtdescription" runat="server" name="txtdescription" cols="5" rows="10"></textarea> <asp:CustomValidator id="descval" runat="server" ControlToValidate="txtdescription" EnableClientScript="true" Enabled="true" ValidateEmptyText="true" Display="Dynamic" ClientValidationFunction="ValidateTextDesc" Text="*" ErrorMessage="*"/> <asp:Button ID="buttonadd" runat="server" Text="Add text" OnClick="buttonadd_Click" /> And my javascript code that executes the CustomValidator client function is: function ValidateTextDesc(source, args) { var descriptiontext = document.getElementById("txtdescription"); if ((descriptiontext.value.indexOf("<script") != -1) || (descriptiontext.value.length==0)) { args.IsValid=false; } else { args.IsValid = true; } return args.IsValid; } My problem is that i have to click twice my submit button to execute this Client function: Do you know why this issue is happening? Thanks in advance. Regards. Josema.

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• Templates vs. coded HTML

  - by Alan Harris-Reid

  I have a web-app consisting of some html forms for maintaining some tables (SQlite, with CherryPy for web-server stuff). First I did it entirely 'the Python way', and generated html strings via. code, with common headers, footers, etc. defined as functions in a separate module. I also like the idea of templates, so I tried Jinja2, which I find quite developer-friendly. In the beginning I thought templates were the way to go, but that was when pages were simple. Once .css and .js files were introduced (not necessarily in the same folder as the .html files), and an ever-increasing number of {{...}} variables and {%...%} commands were introduced, things started getting messy at design-time, even though they looked great at run-time. Things got even more difficult when I needed additional javascript in the or sections. As far as I can see, the main advantages of using templates are: Non-dynamic elements of page can easily be viewed in browser during design. Except for {} placeholders, html is kept separate from python code. If your company has a web-page designer, they can still design without knowing Python. while some disadvantages are: {{}} delimiters visible when viewed at design-time in browser Associated .css and .js files have to be in same folder to see effects in browser at design-time. Data, variables, lists, etc., must be prepared in advanced and either declared globally or passed as parameters to render() function. So - when to use 'hard-coded' HTML, and when to use templates? I am not sure of the best way to go, so I would be interested to hear other developers' views. TIA, Alan

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• mysql match against russain

  - by Devenv

  Hey, Trying to solve this for a very long time now... SELECT MATCH(name) AGAINST('????????') (russian) doesn't work, but SELECT MATCH(name) AGAINST('abraxas') (english) work perfectly. I know it's something with character-set, but I tried all kind of settings and it didn't work. For now it's latin-1. LIKE works This is the show variables charset related: character_set_client - latin1 character_set_connection - latin1 character_set_database - latin1 character_set_filesystem - binary character_set_results - latin1 character_set_server - latin1 character_set_system - utf8 character_sets_dir - /usr/share/mysql/charsets/ collation_connection - latin1_swedish_ci collation_database - latin1_swedish_ci collation_server - latin1_swedish_ci chunk of /etc/my.cnf default-character-set=latin1 skip-character-set-client-handshake chunk of the dump: /*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */; /*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */; /*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */; /*!40101 SET NAMES utf8 */; DROP TABLE IF EXISTS `scenes_raw`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `scenes_raw` ( `scene_name` varchar(40) DEFAULT NULL, ...blabla... ) ENGINE=MyISAM AUTO_INCREMENT=901 DEFAULT CHARSET=utf8; (I did tests without skip-character-set-client-handshake too) SHOW TABLE STATUS WHERE Name = 'scenes_raw'\G Name: scenes_raw Engine: MyISAM Version: 10 Row_format: Dynamic Index_length: 23552 Collation: utf8_general_ci Checksum: NULL Create_options:

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• PHP - Find parent key of array

  - by Jordan Rynard

  I'm trying to find a way to return the value of an array's parent key. For example, from the array below I'd like to find out the parent's key where $array['id'] == "0002". The parent key is obvious because it's defined here (it would be 'products'), but normally it'd be dynamic, hence the problem. The 'id' and value of 'id' is known though. [0] => Array ( [data] => [id] => 0000 [name] => Swirl [categories] => Array ( [0] => Array ( [id] => 0001 [name] => Whirl [products] => Array ( [0] => Array ( [id] => 0002 [filename] => 1.jpg ) [1] => Array ( [id] => 0003 [filename] => 2.jpg ) ) ) ) )

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• Cross-platform game development: ease of development vs security

  - by alcuadrado

  Hi, I'm a member and contributor of the Argentum Online (AO) community, the first MMORPG from Argentina, which is Free Software; which, although it's not 3D, it's really addictive and has some dozens of thousands of users. Really unluckily AO was developed in Visual Basic (yes, you can laugh) but the former community, so imagine, the code not only sucks, it has zero portability. I'm planning, with some friends to rewrite the client, and as a GNU/Linux frantic, want to do it cross-platform. Some other people is doing the same with the server in Java. So my biggest problem is that we would like to use a rapid development language (like Java, Ruby or Python) but the client would be pretty insecure. Ruby/Python version would have all it's code available, and the Java one would be easily decompilable (yes, we have some crackers in the community) We have consider the option to implement the security module in C/C++ as a dynamic library, but it can be replaced with a custom one, so it's not really secure. We are also considering the option of doing the core application in C++ and the GUI in Ruby/Python. But haven't analysed all it's implications yet. But we really don't want to code the entire game in C/C++ as it doesn't need that much performance (the game is played at 18fps on average) and we want to develop it as fast as possible. So what would you choose in my case? Thank you!

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• Force creation of query execution plan

  - by Marc

  I have the following situation: .net 3.5 WinForm client app accessing SQL Server 2008 Some queries returning relatively big amount of data are used quite often by a form Users are using local SQL Express and restarting their machines at least daily Other users are working remotely over slow network connections The problem is that after a restart, the first time users open this form the queries are extremely slow and take more or less 15s on a fast machine to execute. Afterwards the same queries take only 3s. Of course this comes from the fact that no data is cached and must be loaded from disk first. My question: Would it be possible to force the loading of the required data in advance into SQL Server cache? Note My first idea was to execute the queries in a background worker when the application starts, so that when the user starts the form the queries will already be cached and execute fast directly. I however don't want to load the result of the queries over to the client as some users are working remotely or have otherwise slow networks. So I thought just executing the queries from a stored procedure and putting the results into temporary tables so that nothing would be returned. Turned out that some of the result sets are using dynamic columns so I couldn't create the corresponding temp tables and thus this isn't a solution. Do you happen to have any other idea?

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• Why does perl crash with "*** glibc detected *** perl: munmap_chunk(): invalid pointer"?

  - by sid_com

  #!/usr/bin/env perl use warnings; use strict; use 5.012; use XML::LibXML::Reader; my $reader = XML::LibXML::Reader->new( location => 'http://www.heise.de/' ) or die $!; while ( $reader->read ) { say $reader->name; } At the end of the output from this script I get this error-messages: * glibc detected * perl: munmap_chunk(): invalid pointer: 0x0000000000b362e0 * ======= Backtrace: ========= /lib64/libc.so.6[0x7fb84952fc76] ... ======= Memory map: ======== 00400000-0053d000 r-xp 00000000 08:01 182002 /usr/local/bin/perl ... Is this due a bug? perl -V: Summary of my perl5 (revision 5 version 12 subversion 0) configuration: Platform: osname=linux, osvers=2.6.31.12-0.2-desktop, archname=x86_64-linux uname='linux linux1 2.6.31.12-0.2-desktop #1 smp preempt 2010-03-16 21:25:39 +0100 x86_64 x86_64 x86_64 gnulinux ' config_args='-Dnoextensions=ODBM_File' hint=recommended, useposix=true, d_sigaction=define useithreads=undef, usemultiplicity=undef useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=define, use64bitall=define, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2', cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include' ccversion='', gccversion='4.4.1 [gcc-4_4-branch revision 150839]', gccosandvers='' intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16 ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='cc', ldflags =' -fstack-protector -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64 /usr/local/lib64 libs=-lnsl -ldl -lm -lcrypt -lutil -lc perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc libc=/lib/libc-2.10.1.so, so=so, useshrplib=false, libperl=libperl.a gnulibc_version='2.10.1' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector' Characteristics of this binary (from libperl): Compile-time options: PERL_DONT_CREATE_GVSV PERL_MALLOC_WRAP USE_64_BIT_ALL USE_64_BIT_INT USE_LARGE_FILES USE_PERLIO USE_PERL_ATOF Built under linux Compiled at Apr 15 2010 13:25:46 @INC: /usr/local/lib/perl5/site_perl/5.12.0/x86_64-linux /usr/local/lib/perl5/site_perl/5.12.0 /usr/local/lib/perl5/5.12.0/x86_64-linux /usr/local/lib/perl5/5.12.0 .

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• jquery wait till large document is loaded

  - by Martijn

  In my web application I call a document can be huge. This document is loaded into an iframe. I have a title, buttons and the text which all depends on this document. The text is from the large document and is displayed in the iframe. I'd like to show an animated gif while the document is loading on 3 places (1: document title, 2: document buttons, 3: document text, the iframe) I've tried the onload event on the Iframe, but this doesn't give the me the desired effect. Here's my code that loads the document: function loadDocument(id, doc) { $("#DocumentContent").show(); $("#ButtonBox").show(); // Clear dynamic menu items $("#DynamicMenuContent").html(""); $("#PageContent").html(""); // Load document in frame $("#iframeDocument").attr("src", 'ViewDoc.aspx?id=' + id + '&doc=' + doc + ''); // $("#iframeDocument").attr("src", "Graphics/loader.gif"); // Load menu items $.ajax({ url: "ShowButtons.aspx?id=" + id + "&doc=" + doc, success: function(data) { $("#DynamicMenuContent").html(data) }, error: function(xhr, err, e) { alert("error: " + err) } }); // Set document title $("#documentTitle").load("GetDocumentInfo.aspx?p=title"); } My questions, how can I display a loader gif while the document is loaded? And remove the gif when the document is ready?

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• How to route all subdomains to a single host using mDNS?

  - by John Mee

  I have a development webserver hosting as "myhost.local" which is found using Bonjour/mDNS. The server is running avahi-daemon. The webserver also wants to handle any subdomains of itself. Eg "cat.myhost.local" and "dog.myhost.local" and "guppy.myhost.local". Given that myhost.local is on a dynamic ip address from dhcp, is there still a way to route all requests for the subdomains to myhost.local? I'm starting to think it not currently possible... http://marc.info/?l=freedesktop-avahi&m=119561596630960&w=2 You can do this with the /etc/avahi/hosts file. Alternatively you can use avahi-publish-host-name. No, he cannot. Since he wants to define an alias, not a new hostname. I.e. he only wants to register an A RR, no reverse PTR RR. But if you stick something into /etc/avahi/hosts then it registers both, and detects a collision if the PTR RR is non-unique, which would be the case for an alias.

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• InvalidCastException in DataGridView

  - by Max Yaffe

  (Using VS 2010 Beta 2 - .Net 4.0 B2 Rel) I have a class, MyTable, derived from BindingList where S is a struct. S is made up of several other structs, for example: public class MyTable<S>:BindingList<S> where S: struct { ... } public struct MyStruct { public MyReal r1; public MyReal r2; public MyReal R1 {get{...} set{...}} public MyReal R2 {get{...} set{...}} ... } public struct MyReal { private Double d; private void InitFromString(string) {this.d = ...;} public MyReal(Double d) { this.d = d;} public MyReal(string val) { this.d = default(Double); InitFromString(val);} public override string ToString() { return this.real.ToString();} public static explicit operator MyReal(string s) { return new MyReal(s);} public static implicit operator String(MyReal r) { return r.ToString();} ... } OK, I use the MyTable as a binding source for a DataGridView. I can load the data grid easily using InitFromString on individual fields in MyStruct. The problem comes when I try to edit a value in a cell of the DataGridView. Going to the first row, first column, I change the value of the existing number. It gives an exception blizzard, the first line of which says: System.FormatException: Invalid cast from 'System.String' to 'MyReal' I've looked at the casting discussions and reference books but don't see any obvious problems. Any ideas?

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