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• How can let Qt Graphics View Framework support custom layers

  - by jnblue

  Qt's graphics view frameworks is very powerful, but I have not found a way to support custom layers. In Qt, there is a QGraphicsScene::ItemLayer,but QGraphicsScene renders all items are in this layer. I want manage the items with several layers, Just like Illustrator and CorelDraw. all the item only in the current layer will receive the event, be selected or get the key focus etc.. Other layers(not current layer) will not receive all scene event. The most reasons of using layers is I could catalogue a large number of items more clearly.And without needing transfer events to all the layers' items ,I think the graphics frameworks will be more efficient. The last question, does QGraphicsView support rendering server stacked graphics scenes at the same time? If support, I think the "custom layers" can be solved in this way. Thanks very much!

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• Converting Straight Quotes to Curly Quotes

  - by BlueVoid

  I have an application which uses a javascript based rules engine. I need a way to convert regular straight quotes into curl (or smart) quotes. It'd be easy to just do a string.replace for ["], only this will only insert one case of the curly quote. The best way I could think of was replace the first occurrence of a quote with a left curly quote and every other one following with a left, and the rest right curly. Is there a way to accomplish this using javascript?

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• BitBlt code not working

  - by MusiGenesis

  I'm trying to use this code to draw a Bitmap directly onto a PictureBox: Bitmap bmp = (Bitmap)Bitmap.FromFile(@"C:\Users\Ken\Desktop\Load2.bmp"); Graphics grDest = Graphics.FromHwnd(pictureBox1.Handle); Graphics grSrc = Graphics.FromImage(bmp); IntPtr hdcDest = grDest.GetHdc(); IntPtr hdcSrc = grSrc.GetHdc(); BitBlt(hdcDest, 0, 0, pictureBox1.Width, pictureBox1.Height, hdcSrc, 0, 0, (uint)TernaryRasterOperations.SRCCOPY); // 0x00CC0020 grDest.ReleaseHdc(hdcDest); grSrc.ReleaseHdc(hdcSrc); but instead of rendering the Bitmap's contents it just draws a solid block of nearly-black. I'm pretty sure the problem is with the source hDC, because if I change SRCCOPY to WHITENESS in the above code, it draws a solid white block, as expected. Note: this next snippet works fine, so there's nothing wrong with the bitmap itself: Bitmap bmp = (Bitmap)Bitmap.FromFile(@"C:\Users\Ken\Desktop\Load2.bmp"); pictureBox1.Image = bmp;

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• Microsoft Robotics Studio, simple simulation

  - by Arkapravo

  I am soon to start with Microsoft Robotics Studio. My question is to all the gurus of MSRS, Can simple simulation (as obstacle avoidance and wall following) be done without any hardware ? Does MSRS have 3-dimensional as well as 2-dimensional rendering? As of now I do not have any hardware and I am only interested in simulation, when I have the robot hardware I may try to interface it! Sorry for a silly question, I am a MSRS noob, but have previous robotics h/w and s/w experience.

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• VS2010 and local databases

  - by Darren

  Is it possible to connect to a local database (in the app_data folder) using the Data - Transact SQL Editor in Visual Studio 2010? When I launch the Transact SQL Editor from VS2010 I get the "Microsoft SQL Server 2008 RC" connect to server dialog. The options I have for Server type are "Database Engine" and "SQL Server Compact"

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• Is Ogre's use of Exceptions a good way of using them?

  - by identitycrisisuk

  I've managed to get through my C++ game programming career so far virtually never touching exceptions but recently I've been working on a project with the Ogre engine and I'm trying to learn properly. I've found a lot of good questions and answers here on the general usage of C++ exceptions but I'd like to get some outside opinions from here on whether Ogre's usage is good and how best to work with them. To start with, quoting from Ogre's documentation of it's own Exception class: OGRE never uses return values to indicate errors. Instead, if an error occurs, an exception is thrown, and this is the object that encapsulates the detail of the problem. The application using OGRE should always ensure that the exceptions are caught, so all OGRE engine functions should occur within a try{} catch(Ogre::Exception& e) {} block. Really? Every single Ogre function could throw an exception and be wrapped in a try/catch block? At present this is handled in our usage of it by a try/catch in main that will show a message box with the exception description before exiting. This can be a bit awkward for debugging though as you don't get a stack trace, just the function that threw the error - more important is the function from our code that called the Ogre function. If it was an assert in Ogre code then it would go straight to the code in the debugger and I'd be able to find out what's going on much easier - I don't know if I'm missing something that would allow me to debug exceptions already? I'm starting to add a few more try/catch blocks in our code now, generally thinking about whether it matters if the Ogre function throws an exception. If it's something that will stop everything working then let the main try/catch handle it and exit the program. If it's not of great importance then catch it just after the function call and let the program continue. One recent example of this was building up a vector of the vertex/fragment program parameters for materials applied to an entity - if a material didn't have any parameters then it would throw an exception, which I caught and then ignored as it didn't need to add to my list of parameters. Does this seem like a reasonable way of dealing with things? Any specific advice for working with Ogre is much appreciated.

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• Configuring Quercus to talk to JavaDB

  - by Dan Williams

  I am trying to get the Quercus PHP engine to connect with the JavaDB. I have successfully deployed Quercus in Glassfish, but I can't get Quercus to successfully connect with my database in JavaDB. Can anyone point me to an article or tutorial that treats this subject?

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• ASP.NET: images broken when combining URL Rewriting, asp:ImageButton and html base tag

  - by Nick G

  Hi, I'm using URL Rewriting under ASP.NET 4 (using ISAPI_Rewrite) and I'm finding that that some of my images are not loading as .NET does not seem to understand I'm using an html BASE tag (pretty standard and essential when doing URL Rewriting): eg in my development environment I have: <base href='http://localhost/venuefinder/Website/'></base> and on my pages I have: <asp:ImageButton runat="server" ImageUrl="~/images/button.gif" /> On the home page of the site (http://localhost/venuefinder/Website/) this works fine, however on a page that uses URL rewriting, the image does not work: /venuefinder/Website/venues/ashton_gate_stadium/V18639/ ..as the browser is trying to load: http://localhost/images/buttons/search-button.gif instead of: http://localhost/venuefinder/Website/venues/images/buttons/search-button.gif This is happening because .NET is rendering the button as: src="../../../images/buttons/search-button.gif" ...which is incorrect. Is there any way I can correct this problem so that .NET renders the correct src attribute for the image? (without all the ../../../ etc)

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• Flash files are playing laggy /Jerky in screensaver

  - by yogesh-chhabra

  I have developed a screen saver for MAC OS X. Screen saver plays flash files. Whene I run screen saver on display resolution higher than 1300 X 1000 then flash files play very jerky / laggy. When I run it in low resolution then files play fine.Even flash files are playing fine in desktop application. This problem is more on 10.6 Snow Leopard. I am unable to find out the reason whether it is OS screensaver engine problem or flash files problem. I know rendering increases on high resolution but there should be solution for this problem

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• Help a Python newbie with a Django model inheritance problem

  - by Joshmaker

  I'm working on my first real Django project after years of PHP programming, and I am running into a problem with my models. First, I noticed that I was copying and pasting code between the models, and being a diligent OO programmer I decided to make a parent class that the other models could inherit from: class Common(model.Model): self.name = models.CharField(max_length=255) date_created = models.DateTimeField(auto_now_add=True) date_modified = models.DateTimeField(auto_now=True) def __unicode__(self): return self.name class Meta: abstract=True So far so good. Now all my other models extend "Common" and have names and dates like I want. However, I have a class for "Categories" were the name has to be unique. I assume there should be a relatively simple way for me to access the name attribute from Common and make it unique. However, the different methods I have tried to use have all failed. For example: class Category(Common): def __init__(self, *args, **kwargs): self.name.unique=True Spits up the error "Caught an exception while rendering: 'Category' object has no attribute 'name' Can someone point me in the right direction?

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• Performance of DrawingVisual vs Canvas.OnRender for lots of constantly changing shapes

  - by romkyns

  I'm working on a game-like app which has up to a thousand shapes (ellipses and lines) that constantly change at 60fps. Having read an excellent article on rendering many moving shapes, I implemented this using a custom Canvas descendant that overrides OnRender to do the drawing via a DrawingContext. The performance is quite reasonable, although the CPU usage stays high. However, the article suggests that the most efficient approach for constantly moving shapes is to use lots of DrawingVisual instances instead of OnRender. Unfortunately though it doesn't explain why that should be faster for this scenario. Changing the implementation in this way is not a small effort, so I'd like to understand the reasons and whether they are applicable to me before deciding to make the switch. Why could the DrawingVisual approach result in lower CPU usage than the OnRender approach in this scenario?

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• Single Instance Storage layers

  - by Moo

  Hi, I have a data storage requirement which is an excellent candidate for single instance storage and deduplication. Can anyone suggest any .Net compatible libraries or systems which handles SIS and deduplication, either with SQL Server as an actual back end or its own high performance storage engine? What have peoples experiences been with such engines, and are there any pit falls to watch out for? Regards Moo

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• In ExtJS, how do I place two fieldsets side-by-side in a panel with a hbox layout?

  - by Daniel T.

  In ExtJS, I'm having a little trouble placing two fieldsets side-by-side in a panel with a hbox layout. The hbox layout seems to be unaware of the fieldset's height, and cuts it off, even if I explicitly set the panel's height to something large. Here's what it looks like: The blue border is the hbox panel, and there's 2 fieldsets inside, 'Client Info' and 'Owner Info'. The code is like so (simplified and runnable in Firebug): var clientInfo = { xtype: 'fieldset', defaultType: 'textfield', title: 'Client Info', items: [ { fieldLabel: 'First Name' }, { fieldLabel: 'Last Name' }, { fieldLabel: 'Cell Phone #' }, { fieldLabel: 'Work Phone #' } ] }; var ownerInfo = { xtype: 'fieldset', defaultType: 'textfield', title: 'Owner Info', items: [ { fieldLabel: 'First Name' }, { fieldLabel: 'Last Name' }, { fieldLabel: 'Cell Phone #' }, { fieldLabel: 'Work Phone #' } ] }; new Ext.Panel({ layout: 'hbox', frame: true, height: 400, width: 800, defaults: { flex: 1 }, items: [ clientInfo, ownerInfo ] }).render(document.body); P.S. If you remove defaults: { flex: 1 }, the fieldsets render correctly, but doesn't automatically resize to fit the container, which is something I need. Does anybody know how to fix this rendering issue? Thanks.

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• Rails message: ActionView::MissingTemplate

  - by rtfminc

  I am getting an error that I cannot figure out: ActionView::MissingTemplate (Missing template cluster/delete_stuff.erb in view path app/views) <...snip trace...> Rendering rescues/layout (internal_server_error) I am "enhancing" others code and am following the convention they set up, where they have have code like: <%= render :partial => "other_stuff" %> And a file named _other_stuff.html.erb and it all works, but when I copy these little snippets, I get the above error. Any ideas? Something is going on here that I need to figure out.

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• SSRS Email Subscription

  - by Lijo

  Hi Team, I have an report to be sent in email using SSRS 2005. I have created subscription through C# code, some time back. It used to send emails successfully. Now, it does not send. There is a message as "The delivery extension for this subscription could not be loaded." [The report is rendering properly when I try with Report Manager.] What all are the possible reasons for this? Please help... Thanks Lijo

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• how to search media file in our system by c#?

  - by Lalit

  Hi, I want to search the media files situated in my system by c#. means I want to create the search engine that will scan all drives (again small question here , how to get the drives on our system by c# code ? )and search the media files like .mp3,.mp4,...etc . How can i do that by c# desktop application?

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• producing pixel-identical images of text between Sun Java and OpenJDK

  - by yuvi

  My release script produces images of the version number to save me the trouble of manually going into the MoinMoin wiki software and changing it by hand for each release. Unfortunately, since the fonts look a little different on each platform's JVM, the result is ugly. I solved the the font inconsistency by using Lucide Sans (comes with every Java system). (Loading Fonts from TTF files was another option, but was buggy on Mac Java). The result is much better, producing the exact same image on Mac/Windows (), but a slightly different one on OpenJDK (). I believe this is caused by OpenJDK having a different font rendering system (as opposed to different fonts). Is there any way I can get all three of my target platforms (Sun Windows, Mac, OpenJDK Linux) to produce images of text that look identical?

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• C# Value member property repopulate or Re render the control..

  - by karthik

  Hi.. I just wanted to confirm couple of things. I) Code snippet: cmb1.Datasource= dt; cmb1.Valuemember = "value"; Does the control rendering happens 2 time for the control, 1 more time extra because of the value member getting changed after data source assigned. Is this so? II) How can I trace these re-populations in C#? I just wanted to debug and see and confirm? Example please? Thanks Karthik

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• Ruby on Rails: How to verify haml files syntax within rails project?

  - by Acidburn2k

  I've installed HAML into my project and it is working like a charm - the templates are beeing rendered without a problem. My question is how can I do the rendering on the command line, by using HAML program. That would be super for debugging purposes, meantime while I try to compile HAML file I get the error on first Rails related Ruby code to be found: % cat app/views/dashboard/index.html.haml - title "Home" %p Lorem ipsum dolor sit amet... % haml app/views/dashboard/index.html.haml Exception on line 1: undefined method `title' for #<Object:0xb73283b0> Use --trace for backtrace. Page is rendered fine returned correctly through the webserver.

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• Windows RPC vs XML-RPC

  - by Y.Z

  Is there any benchmark about encoding/decoding certain common typed data in Microsoft RPC NDR engine (DCE 1.1) in comparison with that in XML-RPC-C/C++ in the de-facto C/C++ implementation in XML-RPC? Actually I have to choose between Windows RPC and XML-RPC-C/C++ to implement my own common object infrastructure for High Performance Computing on Windows. Any recommandation about which with regard to their performance? Thank you. Best Regards, Yang

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• Spring WS WebServicesTemplate/Jaxb2Marshaller client view raw xml?

  - by wuntee

  Is it possible to view the request and the response for a Spring WS client using WebServicesTemplate and Jxb2Marshaller as the marshaling engine? I simply wan to to log the xml, not perform any actions upon the raw xml.

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• ASP.NET MVC The new ActionLink with MvcHtmlString and request URL generated

  - by mare

  This piece of code used to work in MVC 1 but it does not since I upgraded to MVC 2: <%=Html.ActionLink(Resources.Localize.Routes_WidgetsCreate, "Create" + "?modal=true", "Widget", null, new { rel = "shadowbox;height=600;width=700", title = Resources.Localize.Routes_WidgetsCreate })%> I am aware it has something to do with the way ActionLink encodes things, so the result that comes out is something like this: "http://localhost:53704/Widget/Create%3fmodal%3dtrue" The problem is, when clicked, the Shadowbox modal opens up and inside, where the request View should be rendered is this exception: Server Error in '/' Application. A potentially dangerous Request.Path value was detected from the client (?). What can I do to get past that? Do you recommend another way of sending params to the view besides in QueryString (in this case I need "modal" because in the view I select CSS styles based on whether we are rendering modal or not)?

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• Performance benefits of upgrading Richfaces to newer version

  - by peteDog

  I have a client that's running an application based on JBoss 4.0.5, Seam 1.2 and RichFaces 3.0.1. Their system is having performance problems due to the fact that a lot of data is coming back from the server to be displayed on screen and it seems like the rendering of that data is taking forever. The data brought back is displayed in a tabbed interface, but the tabs aren't currently being loaded individually, but all at once. I'm trying to build up a case to present to the client on the benefits of upgrading to never version of RichFaces, which, as I understand it, has added a great number of features related to tabbed panels and being able to use ajax to page the data and load the chunks you actually need to display at the moment, and not the rest that's in other tabs. The move to a newer version of RichFaces will also result in never versions of Jboss and Seam, as the current production build of RichFaces 3.2.1 requires JSF 1.2. IF anyone has some suggestions or experience on performance of current versions RichFaces, paging, etc, I would really appreciate some feedback.

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• Ensure exclusive access to webservice

  - by Henrik P. Hessel

  Just to be on the safe side, what's the best practice to ensure that only my application has access to my webservice, which is hosted on a public server? Should I implement I shared key or something? My webservice is hosted on Googles App Engine and my Application runs on iPhones and iPads. If you need further information, just ask. Thanks, Henrik

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• zend_form ViewScript decorator / passing arguments

  - by timpone

  I have a form that is extend from Zend_Form. I am placing the form into a ViewScript decorator like this: $this->setDecorators(array(array('ViewScript', array('viewScript' => 'game/forms/game-management.phtml')))); I'd like to pass in a variable to this ViewScript but am not sure how this could be done. Since the partial renders out as a Zend_View (allowing $this-app_store_icon for rendering), it seems like there should be a way to pass variables to be rendered. I tried the following but to no avail. $this->setDecorators(array(array('ViewScript', array('viewScript' => 'game/forms/game-management.phtml'),array('app_store_picon'=>$current_app_store_picon)))); Any help on how to get this done would be appreciated. thanks

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