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• Passing a SAFEARRAY from C# to COM

  - by SlavaGu

  I use 3rd party COM to find faces in a picture. One of the methods has the following signature, from SDK: long FindMultipleFaces( IUnknown* pIDibImage, VARIANTARG* FacePositionArray ); Parameters: pIDibImage[in] - The image to search. FacePositionArray[out]- The array of FacePosition2 objects into which face information is placed. This array is in a safe array (VARIANT) of type VT_UNKNOWN. The size of the array dictates the maximum number of faces for which to search. which translates into the following C# method signature (from metadata): int FindMultipleFaces(object pIDibImage, ref object pIFacePositions); Being optimistic I call it the following way but get an exception that the memory is corrupt. The exception is thrown only when a face is present in the image. FacePosition2[] facePositions = new FacePosition2[10]; object positions = facePositions; int faceCount = FaceLocator.FindMultipleFaces(dibImage, ref positions); What's the right way to pass SAFEARRAY to unmanaged code?

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• setting a timeout using a manually created forms authentication ticket

  - by Nicklamort

  The constructors for manually creating FormsAuthenticationTicket objects force us to set an "expiration" value, and this value overrides the "timeout" setting in web.config in my tags, which is not what I want, because now the user doesn't timeout. The "session" just expires at the given time. I need to manually create my ticket for UserData reasons, and it is just the way I decided to build my app. I guess I could spend a whole lot of time and redo the way my app. authorizes, and store the "userdata" elsewhere... but this seems extremely tedious for something so small.. Is there anyway to manually create an Auth Ticket and still maintain timeout settings?! And by timeout, I mean resetting the timer on user activity. Not a fixed timeout! Please help!

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• Bullet Physics, when to choose which DynamicsWorld?

  - by Sqeaky

  I have a few general questions about the bullet physics library. Here is my current understanding in a nutshell: btDiscreteDynamicsWorld - Simplest physics world, only handles rigid bodies, maybe it has better performance. btSoftRigidDynamicsWorld - The only physics world that can work with large jello moulds btContinuousDynamicsWorld - If you have really fast objects this will prevent them from prenetrating each other or flying through each other, but is otherwise like a btDiscreteDynamicsWorld. Is my understanding of the btDiscreetDynamicsWorld, btContinuousDynamicsWorld and btSoftRigidDynamicsWorld classes in terms of functionality, purpose, and performance correct? Why does the user manual recommend the btDiscreteDynamicsWorld class? btSoftRigidDynamicsWorld appears to be the only world that can handle soft bodies, so what if we wanted Continuous Physics integration and Soft bodies? How fast is fast enough to consider using a btContinuousDynamicsWorld, and what are the drawbacks of using one? Edit: My Buddy Mako also posted this question on The Bullet forums: http://www.bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=9&t=4863

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• How can I use a custom ValidationAttribute to ensure two properties match?

  - by Brandon Linton

  We're using xVal and the standard DataAnnotationsValidationRunner described here to collect validation errors from our domain objects and view models in ASP.NET MVC. I'd like to have a way to have that validation runner identify when two properties don't match through the use of custom DataAnnotations. Right now I'm forced into doing it outside of the runner, this way: if (!(model.FieldOne == model.FieldTwo)) errors.Add(new ErrorInfo("FieldTwo", "FieldOne must match FieldTwo", model.FieldTwo)); My question is: can this be done using property-level validation attributes, or am I forced into using class-level attributes (in which case, I'd have to modify the runner...and my follow up question would be how best to retrieve them in that case). Thanks!

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• Intercepting creation of new object.

  - by amctammany

  I'm adding a categorization functionality to my app and struggling with it. Objects have many categories through categorizations. I'm trying to intercept the creation of a new categorization, check if theres a similar one, if so, increment it's count, if not, create a new object. Here's what I have so far. validate :check_unique protected def check_unique categorization = Categorization.where(:category_id => self.category_id, :categorizable_id => self.categorizable_id, :categorizable_type => self.categorizable_type) if categorization.first categorization.first.increment(:count) end end

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• Order by null/not null with ICriteria

  - by Kristoffer

  I'd like to sort my result like this: First I want all rows/objects where a column/property is not null, then all where the colmn/property is null. Then I want to sort by another column/property. How can I do this with ICriteria? Do I have to create my own Order class, or can it be done with existing code? ICriteria criteria = Session.CreateCriteria<MyClass>() .AddOrder(Order.Desc("NullableProperty")) // What do I do here? IProjection? Custom Order class? .AddOrder(Order.Asc("OtherProperty"));

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• Load django template from the database

  - by Björn Lindqvist

  Hello, Im trying to render a django template from a database outside of djangos normal request-response structure. But it appears to be non-trivial due to the way django templates are compiled. I want to do something like this: >>> s = Template.objects.get(pk = 123).content >>> some_method_to_render(s, {'a' : 123, 'b' : 456}) >>> ... the rendered output here ... How do you do this?

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• Django and Reportlab Question

  - by Hellnar

  Hello, I have written this small Django view to return pdf. @login_required def code_view(request,myid): try: deal = Deal.objects.get(id=myid) except: raise Http404 header = deal.header code = deal.code response = HttpResponse(mimetype='application/pdf') response['Content-Disposition'] = 'attachment; filename=code.pdf' p = canvas.Canvas(response) p.drawString(10, 800, header) p.drawString(10, 700, code) p.showPage() p.save() return response And my questions: Utf-8 characters are not shown correctly within the pdf. How can I include an image ? How can I include a very basic html such as: . <ul> <li>List One</li> <li>List Two</li> <li>List Three</li> </ul>

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• Problem creating ObjectContext from different project inside solution.

  - by Levelbit

  I have two projects in my Solution. One implements my business logic and has defined entity model of entity framework. When I want to work with classes defined within this project from another project I have some problems in runtime. Actually, the most concerning thing is why I can not instantiate my, so called, TicketEntities(ObjectContext) object from other projects? when I catch following exception: The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid. I found out it's brake at: public partial class TicketEntities : global::System.Data.Objects.ObjectContext { public TicketEntities() : base("name=TicketEntities", "TicketEntities") { this.OnContextCreated(); } with exception: Unable to load the specified metadata resource. Just to remind you everthing works fine from orginal project.

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• Changing data in a django modelform

  - by Matt Hampel

  I get data in from POST and validate it via this standard snippet: entry_formset = EntryFormSet(request.POST, request.FILES, prefix='entries') if entry_formset.is_valid(): .... The EntryFormSet modelform overrides a foreign key field widget to present a text field. That way, the user can enter an existing key (suggested via an Ajax live search), or enter a new key, which will be seamlessly added. I use this try-except block to test if the object exists already, and if it doesn't, I add it. entity_name = request.POST['entries-0-entity'] try: entity = Entity.objects.get(name=entity_name) except Entity.DoesNotExist: entity = Entity(name=entity_name) entity.slug = slugify(entity.name) entity.save() However, I now need to get that entity back into the entry_formset. It thinks that entries-0-entity is a string (that's how it came in); how can I directly access that value of the entry_formset and get it to take the object reference instead?

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• Spring Security - is Role and ACL security overkill?

  - by HDave

  I have a 3 tier application that requires security authorizations be placed on various domain objects. Whether I use Spring's ACL implementation or roll my own, it seems to me that ACL based security can only be used to authorize (service) methods and cannot be used to authorize URL or web service invocations. I think this because how could a web service call check the ACL before it has hydrated the XML payload? Also, all the examples for web access security in the Spring documentation are securing URL's based on Role. Is it typical to use Spring's roles to secure web presentation and web service calls, while at the same time using ACL's to secure the business methods? Is this overkill?

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• Upload Image with Django Model Form

  - by jmitchel3

  I'm having difficulty uploading the following model with model form. I can upload fine in the admin but that's not all that useful for a project that limits admin access. #Models.py class Profile(models.Model): name = models.CharField(max_length=128) user = models.ForeignKey(User) profile_pic = models.ImageField(upload_to='img/profile/%Y/%m/') #views.py def create_profile(request): try: profile = Profile.objects.get(user=request.user) except: pass form = CreateProfileForm(request.POST or None, instance=profile) if form.is_valid(): new = form.save(commit=False) new.user = request.user new.save() return render_to_response('profile.html', locals(), context_instance=RequestContext(request)) #Profile.html <form enctype="multipart/form-data" method="post">{% csrf_token %} <tr><td>{{ form.as_p }}</td></tr> <tr><td><button type="submit" class="btn">Submit</button></td></tr> </form> Note: All the other data in the form saves perfectly well, the photo does not upload at all. Thank you for your help!

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• Assign binding path at runtime in WPF DataTemplate

  - by Abiel

  I am writing a WPF program in C# in which I have a ListView for which the columns will be populated at runtime. I would like to use a custom DataTemplate for the GridViewColumn objects in the ListView. In the examples I have seen where the number of columns is fixed in advance, a custom DataTemplate is often created using something like the XAML below. <DataTemplate x:Key="someKey"> <TextBlock Text="{Binding Path=FirstName}" /> </DataTemplate> This DataTemplate could also later be assigned to GridViewColumn.CellTemplate in the code-behind by calling FindResource("someKey"). However, this alone is of no use to me, because in this example the Path element is fixed to FirstName. Really I need something where I can set the Path in code. It is my impression that something along these lines may be possible if XamlReader is used, but I'm not sure how in practice I would do this. Any solutions are greatly appreciated.

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• Refactoring a custom User model to user UserProfile: Should I create a custom UserManager or add use

  - by BryanWheelock

  I have been refactoring an app that had customized the standard User model from django.contrib.auth.models by creating a UserProfile and defining it with AUTH_PROFILE_MODULE. The problem is the attributes in UserProfile are used throughout the project to determine the User sees. I had been creating tests and putting in this type of statement repeatedly: user = User.objects.get(pk=1) user_profile = user.get_profile() if user_profile.karma > 10: do_some_stuff() This is tedious and I'm now wondering if I'm violating the DRY principle. Would it make more sense to create a custom UserManager that automatically loads the UserProfile data when the user is requested. I could even iterate over the UserProfile attributes and append them to the User model. This would save me having to update all the references to the custom model attributes that litter the code. Of course, I'd have to reverse to process for to allow the User and UserProfile models to be updated correctly. Which approach is more Django-esque?

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• Add a delay to OnContactDown events for Surface controls

  - by RTigger

  We're using the Controls.PreviewContactDown, PreviewContactUp, and PreviewContactChanged events to capture tagged items being placed, removed, and moved on the Surface, which works great in the Simulator application that comes with the surface. On an actual Surface if you moved a tagged item too quickly the cameras actually lose focus of the tag, assume it was removed, and then re-capture it when it stops moving. That provides a pretty poor experience for our clients. What I'm proposing is a way to override or create a new event that would respond to tagged item events, but not fire the event handler until after a delay... i.e. if "ContactUp" is fired, wait 100ms and THEN execute the event handler. Ideally we'd just be able to use an alternate attached property to define these event handlers, i.e. <Panel local:TagDown="TagDownEventHandler" /> And if we could get it to use ICommand objects instead of event handlers that'd be even better.

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• How do I modify my WCF service to work with ASP.NET pages?

  - by Scott

  I created a WCF service (.NET 3.5) that grabs data from a db and returns a list of objects. It works just fine. I tested it using the WCFTestClient application and got the desired results. Now, I tried to create an ASP.NET web application and consume the service. After enabling <serviceDebug includeExceptionDetailInFaults="true"/> in the config file, the error message is "Object reference not set to an instance of an object." How do I modify the service to work with ASP.NET? Thanks!

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• How to dispose NHibernate ISession in an ASP.NET MVC App

  - by Joe Young

  I have NHibernate hooked up in my asp.net mvc app. Everything works fine, if I DON'T dispose the ISession. I have read however that you should dispose, but when I do, I get random "Session is closed" exceptions. I am injecting the ISession into my other objects with Windsor. Here is my current NHModule: public class NHibernateHttpModule : IHttpModule { public void Init(HttpApplication context) { context.BeginRequest += context_BeginRequest; context.EndRequest += context_EndRequest; } static void context_EndRequest(object sender, EventArgs e) { CurrentSessionContext.Unbind(MvcApplication.SessionFactory); } static void context_BeginRequest(object sender, EventArgs e) { CurrentSessionContext.Bind(MvcApplication.SessionFactory.OpenSession()); } public void Dispose() { // do nothing } } Registering the ISession: container .Register(Component.For<ISession>() .UsingFactoryMethod(() => MvcApplication.SessionFactory.GetCurrentSession()).LifeStyle.Transient); The error happens when I tack the Dispose on the unbind in the module. Since I keep getting the session is closed error I assume this is not the correct way to do this, so what is the correct way? Thanks, Joe

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• Vsync in Flex/Flash/AS3?

  - by oshyshko

  I work on a 2D shooter game with lots of moving objects on the screen (bullets etc). I use BitmapData.copyPixels(...) to render entire screen to a buffer:BitmapData. Then I "copyPixels" from "buffer" to screen:BitmapData. The framerate is 60. private var bitmap:Bitmap = new Bitmap(); private var buffer:Bitmap = new Bitmap(); private function start():void { addChild(bitmap); } private function onEnterFrame():void { // render into "buffer" // copy "buffer" -> "bitmap" } The problem is that the sprites are tearing apart: some part of a sprite got shifted horizontally. It looks like a PC game with VSYNC turned off. Did anyone solve this problem? UPDATE: the question is not about performance, but about getting rid of screen tearing. [!] UPDATE: I've created another question and here you may try both implementations: using Flash way or BitmapData+copyPixels()

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• Default value for field in Django model

  - by Daniel Garcia

  Suppose I have a model: class SomeModel(models.Model): id = models.AutoField(primary_key=True) a = models.IntegerField(max_length=10) b = models.CharField(max_length=7) Currently I am using the default admin to create/edit objects of this type. How do I set the field 'a' to have the same number as id? (default=???) Other question Suppose I have a model: event_date = models.DateTimeField( null=True) year = models.IntegerField( null=True) month = models.CharField(max_length=50, null=True) day = models.IntegerField( null=True) How can i set the year, month and day fields by default to be the same as event_date field?

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• Can't find how to import as one object or how to merge

  - by Aaron

  I need write a script in blender that creates some birds which fly around some obstacles. The problem is that I need to import a pretty large Collada model (a building) which consists of multiple objects. The import works fine, but the the building is not seen as 1 object. I need to resize and move this building, but I can only get the last object in the building (which is a camera)... Does anyone know how to merge this building in 1 object, group, variable... so I can resize and move it correctly? Part of the code I used: bpy.ops.wm.collada_import(filepath="C:\\Users\\me\\building.dae") building= bpy.context.object building.scale = (100, 100, 100) building.name = "building"

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• OPENGLES 2.0 equivalent of glorthof?

  - by Zippo

  Hi Guys, In my iphone app, i need to project 3d scene into the 2D coordinates of the screen for some calculations. My objects go through various rotations, translations and scaling. So i figured i need to multiply the vertices with ModelView matrix first, then i need to multiply it with the Orthogonal projection matrix. First of all am on the right track? I have the Model View Matrix, but need the projection matrix. Is there a glorthof equivalent in ES 2.0? PS: i am new to opengl. Thanks for your help. Zippo

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• Scala Actors with Java interop to underlying COM libraries

  - by wheaties

  I'm working on a JVM project which uses ESRI components (COM based, wrapped with JIntegra.) The client has requested the JAR files we produce work on the JVM and be accessible to Java code. I'd like to use Scala but I'm worried about how well the library will play with Scala's actors. Particularly I'm worried about the different mechanisms COM and Java employ to pass objects from one thread to another. Does anyone have any experience with this? Will they play nice? Edit: for clarification I noticed that when performing I/O on the ESRI DB that the CPU utilization is roughly 15%. I'd like to read each row and pass that row over to another actor for parsing. Then I could have several threads reading from the DB at once. The problem is that each row retrieved using ESRI's library is actually a Java wrapped COM object.

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• Eclipse + Git: Can't add files to my repository

  - by Stegeman

  I use Eclipse (Helios) with PDT and egit. I have a project without versioning, so I created a git repository for it by doing: Team -> Share Project When I try to add the files of my project to the repository: Team -> Add I get an exception: Failed to add resource to index Failed to add resource to index Exception caught during execution of add command When I add the files manually on the command line, everything is working fine. Any ideas? EDIT: The error eclipse gives is: Caused by: org.eclipse.jgit.errors.ObjectWritingException: Unable to create new object: Z:\eage_layout\.git\objects\60\f30dd232bd6ddaeb198fb11400c2613a072189 at org.eclipse.jgit.storage.file.ObjectDirectoryInserter.insert(ObjectDirectoryInserter.java:100) at org.eclipse.jgit.api.AddCommand.call(AddCommand.java:177) The code I'm running is located on a virtual machine running on CentOs. I'm working on a windows machine and using a samba share to get access to the code on the virtual machine. I've put the filesystem permissions on my .git directory to 777, but still it does not work.

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• Core data and special characters (UTF-8)

  - by MW

  I have an iPhone application using Core Data with an SQLite database in the bottom. I'm writing some text content from the database to a file, but special characters such as Å, Ä and Ö are corrupted in the file (they show up just fine in the application). When creating and inserting data, I am not using any special encoding. I'm just taking the NSString (entered by the user in a UITextField) and putting it in my persistent objects. When saving the file, I use the following code: [csvString writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error]; I tried adding a BOM to the beginning of the text ("\xef\xbb\xbf") but it is still corrupted. Anyone has any ideas where the problem might be? Examples of corrupted characters: å becomes ö, ä becomes ä

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• Removing an Entity from an EntitySet during Iteration...

  - by Gregorius

  I've got this code... seems nice and elegant, but apparently the framework don't like it when i mess with a collection while iterating through it: foreach (KitGroup kg in ProductToTransfer.KitGroups) { // Remove kit groups that have been excluded by the user if (inKitGroupExclusions != null && inKitGroupExclusions.Contains(kg.KitGroupID)) ProductToTransfer.KitGroups.Remove(kg); else { // Loop through the kit items and do other stuff //... } } The error it throws when it iterates to the 2nd object in the collection is: "EntitySet was modified during enumeration" I know i could create a new collection of KitGroup objects (or even just IDs) that i want to remove, and then another loop afterwards to loop through these, and remove them from the collection, but this just seems like unnecessary extra code... can anybody suggest a more elegant way of achieving the same thing? Cheers Greg

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