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• How to use LocalValueBean in jsp page.

  - by Himanshu

  I have set certain bean label and bean value in one of my dao class.. I have created a list of LocalValueBean objects and passed it as a list to jsp.. now here at jsp i need to print the label seperately and on hover to the label i need to show the value.. i need to exttract or to say get those values in jsp directly... i have also imported the org.apache.struts.util.LabelValueBean in my jsp but still its not working.. please let me know if you any ideas...

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• GUI designers! - got suggestions for a GUI modelling diagram language?

  - by naugtur

  Refering to this question I asked a while ago: UI functionality modeling languages It looks like there is no good-enough solution. I decided to develop one. (and prepare a set of elements for DIA or something) I'm sure it will require a good insight in peoples' experiences and problems in designing functionally complicated GUIs. I've got some ideas already, but I'd like to hear from You what You'd expect from a GUI functionality modelling language. Clarification: It's functionality modelling, so it's not about where I put a button. It's about objects that have some events binded, and the interface behaviour logic. If You think (just as I do) that UML is far from useful for such purposes - feel free to put Your expectations here. I'll try to meet them. ( not necessarily in person;) ) Remember - there is no such thing as a wrong answer to this question

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• Linq to SQL Azure genrating Error "Specified cast is not valid."

  - by Rabbi

  B"H I have an application that has been working for months using Linq to SQL connecting to a SQLExpress. I tried migrating it to SQL Azure. I copied the structure and data using the Sync Framework. I viewed the data in SQL Azure using SSMS 2008 R2 and it seams to be exactly what I have in my Sql Server. However when I try to use Linq to SQL against it I get an error "Specified cast is not valid." I seams to be happening any time I get child records. i.e. whenever I fill (the first time I access) an entity set. It seams to be happening after the data returns and when Linq tries to put it into the objects. remember, the application is working perfectly against sqlexpress, even when accessed across the internet or vpn.

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• WCF RIA Services v1.0 Timeouts

  - by Dan Wray

  I have a RIA service methods which return quite a large amount of (binary) data to my silverlight application. The methods themselves (database access etc) complete quickly, but since I upgraded to v1.0 from the RC2 I've been experiencing timeouts, even when I limit the data returned to the smallest objects. Debug shows the method returning, then 20-30 seconds later the silverlight "method complete" event will fire. There is not enough data to cause that much lag. Could anyone suggest why this might be? I've been unable to find any breaking changes documentation specific to the RC2 = 1.0 upgrade. Trying to eliminate any other possible causes also, but this is literally a case of worked before the install, doesn't work now! (also upgraded silverlight 4 tools for vs).

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• Can't Use Generic C# Class in Using Statement

  - by Eric J.

  I'm trying to use a generic class in a using statement but the compiler can't seem to treat it as implementing IDisposable. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.Objects; namespace Sandbox { public sealed class UnitOfWorkScope<T> where T : ObjectContext, IDisposable, new() { public void Dispose() { } } public class MyObjectContext : ObjectContext, IDisposable { public MyObjectContext() : base("DummyConnectionString") { } #region IDisposable Members void IDisposable.Dispose() { throw new NotImplementedException(); } #endregion } public class Consumer { public void DoSomething() { using (new UnitOfWorkScope<MyObjectContext>()) { } } } } Compiler error is: Error 1 'Sandbox.UnitOfWorkScope<Sandbox.MyObjectContext>': type used in a using statement must be implicitly convertible to 'System.IDisposable' I implemented IDisposable on UnitOfWorkScope (and to see if that was the problem, also on MyObjectContext). What am I missing?

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• How to add default value on save form?

  - by Ignacio

  I have an object Task and a form that saves it. I want to automatically asign created_by field to the currently logged in user. So, my view is this: def new_task(request, task_id=None): message = None if task_id is not None: task = Task.objects.get(pk=task_id) message = 'TaskOK' submit = 'Update' else: task = Task(created_by = GPUser(user=request.user)) submit = 'Create' if request.method == 'POST': # If the form has been submitted... form = TaskForm(request.POST, instance=task) if form.is_valid(): task = form.save(commit=False); task.created_by = GPUser(user=request.user) task.save() if message == None: message = 'taskOK' return tasks(request, message) else: form = TaskForm(instance=task) return custom_render('user/new_task.html', {'form': form, 'submit': submit, 'task_id':task.id}, request) The problem is, you guessed, the created_by field doesn't get saved. Any ideas? Thanks

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• flash - django communication -- amf, xml, or json?

  - by shanyu

  We are considering to develop a Flash front-end to a web application written using Django. The Flash front-end will send a simple "id" to the server and in response receive a couple of objects. The application will be open only to authenticated users. To the extend of my current knowledge (which is basic for Flash) we can either use AMF or take an XML or JSON approach. AMF seems to have an upperhand as there are examples out on the internet showing it can cooperate easily with Django's authentication mechanism (most examples feature pyAMF). On the other hand, implementing a XML/JSON based solution may be easier and hassle free. Guidance will be much appreciated.

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• [Django] How to find out whether a model's column is a foreign key?

  - by codethief

  I'm dynamically storing information in the database depending on the request: // table, id and column are provided by the request table_obj = getattr(models, table) record = table_obj.objects.get(pk=id) setattr(record, column, request.POST['value']) The problem is that request.POST['value'] sometimes contains a foreign record's primary key (i.e. an integer) whereas Django expects the column's value to be an object of type ForeignModel: Cannot assign "u'122'": "ModelA.b" must be a "ModelB" instance. Now, is there an elegant way to dynamically check whether b is a column containing foreign keys and what model these keys are linked to? (So that I can load the foreign record by it's primary key and assign it to ModelA?) Or doesn't Django provide information like this to the programmer so I really have to get my hands dirty and use isinstance() on the foreign-key column?

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• @property, setter and getter question?

  - by fuzzygoat

  NSString *statusValue; NSString *currentValue; @property(retain, nonatomic) NSString *statusValue; @property(retain, nonatomic) NSString *currentValue; @synthesize statusValue; @sythnesize currentValue; Given the above, if I am setting one variable to another is it work doing ... [self setStatusValue: currentValue]; or should I use the property again and use [self setStatusValue: [self currentValue]]; I suppose the latter (although maybe overkill) does tell the reader that we are using one of the objects instance variables and not some local variable. just curious really ... gary

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• Most efficient algorithm for mesh-level, optimal occlusion culling?

  - by Fredriku73

  I am new to culling. On a first glance, it seems that most occlusion culling algorithms are object-level, not examining single meshes, which would be practical for game rendering. What I am looking for is an algorithm that culls all meshes within a single object that are occluded for a given viewpoint, with high accuracy. It needs to be at least O(n log n), a naive mesh-by-mesh comparison (O(n^2)) is too slow. I notice that the Blender GUI identifies the occluded meshes for you in real-time, even if you work with large objects of 10,000+ meshes. What algorithm is used there, pray tell?

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• WeakReferences are not freed in embedded OS

  - by Carsten König

  I've got a strange behavior here: I get a massive memory leak in production running a WPF application that runs on a DLOG-Terminal (Windows Embedded Standard SP1) that behaves perfectly fine if I run it localy on a normal desktop (Win7 prof.) After many unsucessful attempts to find any problem I put one of those directly beside my monitor, installed the ANTs MemoryProfiler and did one hour test run simulating user operations on both the terminal and my development PC. Result is, that due to some strange reasons the embedded system piles up a huge amount of WeakReference and EffectiveValueEntry[] Objects. Here are are some pictures: Development (PC): And the terminal: Just look at the class list... Has anyone seen something like this before and are there known solutions to this? Where can I get help? (PS the terminals where installed with images prepared for .net4)

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• Security in API authentication

  - by Carlos

  We are in the process of revamping our server side API, and we need to manage security. Our current model requires that a credentials object (containing user, password, and pin) be included in each method invocation. Our development team, however, has decided that we should have session objects instead (which is fine by me), but the new credentials are just a GUID. This is very different from what I've seen in other APIs in our industry, so I'm a bit concerned about how secure the new model will be. I asked them if they had analyzed both alternatives, and they said they haven't. Does anyone know if there're any clear advantages, disadvantages, risks, etc. of using a set of credentials versus just one element (complex as it may be)? PS: the communication channel would be secure in either case, and it's separate from this particular topic

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• NSUndoManager won't undo editing of a NSMutableDictionary

  - by xon1c

  Hi, I'm experiencing problems with the undo operation. The following code won't undo an removeObjectForKey: operation but the redo operation setObject:ForKey: works. - (void) insertIntoDictionary:(NSBezierPath *)thePath { [[[window undoManager] prepareWithInvocationTarget:self] removeFromDictionary:thePath]; if(![[window undoManager] isUndoing]) [[window undoManager] setActionName:@"Save Path"]; NSLog(@"Object id is: %d and Key id is: %d", [currentPath objectAtIndex:0], thePath); [colorsForPaths setObject:[currentPath objectAtIndex:0] forKey:thePath]; } - (void) removeFromDictionary:(NSBezierPath *)thePath { [[[window undoManager] prepareWithInvocationTarget:self] insertIntoDictionary:thePath]; if(![[window undoManager] isUndoing]) [[window undoManager] setActionName:@"Delete Path"]; NSLog(@"Object id is: %d and Key id is: %d", [[colorsForPaths allKeys] objectAtIndex:0], thePath); [colorsForPaths removeObjectForKey:thePath]; } The output on the console looks like: // Before setObject:ForKey: Object id is: 1184384 and Key id is: 1530016 // Before removeObjectForKey: UNDO Object id is: 2413664 and Key id is: 1530016 I don't get why the Object id is different although the Key id remains the same. Is there some special undo/redo handling of NSMutableDictionary objects? thx xonic

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• Reading a Delphi binary file in Python

  - by Brendan

  I have a file that was written with the following Delphi declaration ... Type Tfulldata = Record dpoints, dloops : integer; dtime, bT, sT, hI, LI : real; tm : real; data : array[1..armax] Of Real; End; ... Var: fh: File Of Tfulldata; I want to analyse the data in the files (many MB in size) using Python if possible - is there an easy way to read in the data and cast the data into Python objects similar in form to the Delphi records? Does anyone know of a library perhaps that does this?

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• Generic unboxing of boxed value types

  - by slurmomatic

  I have a generic function that is constrained to struct. My inputs are boxed ("objects"). Is it possible to unbox the value at runtime to avoid having to check for each possible type and do the casts manually? See the above example: public struct MyStruct { public int Value; } public void Foo<T>(T test) where T : struct { // do stuff } public void TestFunc() { object o = new MyStruct() { Value = 100 }; // o is always a value type Foo(o); } In the example, I know that o must be a struct (however, it does not need to be MyStruct ...). Is there a way to call Foo without tons of boilerplate code to check for every possible struct type? Thank you.

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• Adorners for C# Windows Forms

  - by j-t-s

  Hello, I have a canvas (Panel Control) in my WinForms app where users can drag things like textbox's, labels etc around. But I want to make it easier for them to more precisely align the objects. I've read into it and Adorners seem to be the way to go? But, apparently it's only for WPF. WPF is not an option for me, unfortunately. What I'm trying to accomplish is to have lines pop up every time the user drags an object around in the canvas... Just how they work in the Windows Forms Designer View. I'd appreciate any help at all. Thank you.

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• Using C# Type as generic

  - by I Clark

  I'm trying to create a generic list from a specific Type that is retrieved from elsewhere: Type listType; // Passed in to function, could be anything var list = _service.GetAll<listType>(); However I get a build error of: The type or namespace name 'listType' could not be found (are you missing a using directive or an assembly reference?) Is this even possible or am I setting foot onto C# 4 Dynamic territory? As a background: I want to automatically load all lists with data from the repository. The code below get's passed a Form Model whose properties are iterated for any IEnum (where T inherits from DomainEntity). I want to fill the list with objects of the Type the list made of from the repository. public void LoadLists(object model) { foreach (var property in model.GetType() .GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.SetProperty)) { if (IsEnumerableOfNssEntities(property.PropertyType)) { var listType = property.PropertyType.GetGenericArguments()[0]; var list = _repository.Query<listType>().ToList(); property.SetValue(model, list, null); } } }

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• How to use QMetaMethod with QObject::connect

  - by VestniK

  I have two instances of QObject subclasses and two QMetaMethod instances of signal in one of objects and slot in another object. I want to connect this signal and slot with each other. I've looked through the qobject.h file and find that SIGNAL() and SLOT() macro are just add "1" or "2" character to the beginning of method signature so it looks like it should be possible to add the same character to the beginning of string returned by QMetaMethod::signature() but this approach depends on some undocumented internals of toolkit and may be broken at any time by a new version of Qt. Does anybody know reliable way to connect signals and slots through their QMetaMethod reflection representation?

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• AsyncTask and onDestroy...

  - by stormin986

  I have an activity initiate a few AsyncTask downloads. After two of the three finish, it issues an Intent to load the next activity while still finishing up the last download. Obviously in onDestroy() i will call cancel() on all AsyncTask objects. If the OS tries to destroy my activity after the next activity starts, it will call and begin executing onDestroy in the apps UI thread, right? It won't wait for that AsyncTask to complete, correct? In all cases it will ultimately call onDestroy(), in turn canceling all AsyncTasks?

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• How can I create a collection of references in C#

  - by Jonathan Kaufman

  Ok I am having a cross language hiccup. In C# with it's great collections like List and I have: a Map class with properties of: List<byte[]> Images; List<Tile> Tiles; a Tile Class of: byte[] ImageData; int X; int Y; Now I want to add an image to the Map class and have the ImageData property of the Tile Classes to "reference" it. I have discovered I can't just assign it Images[0]. You can't have a reference to an object of a List. My fix was to create a Dictionary. Is this the best way or can I somehow have a "pointer" to a collection of objects?

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• textures and vertex arrays with OpenGL?

  - by user146780

  Basically what I'd like to do is make textured NGONS. I also want to use a tesselator (GLU) to make concave and multicontour objects. I was wondering how the texture comes into play though. I think that the tesselator will return verticies so I will add these to my array, that's fine. But my vertex array will contain more than one polygon object so then how can I tell it when to bind the texture like in immediate mode? Right now I feel stuck with one call to bind. How can this be done? Thanks

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• How to get unique URL identifier after inserting item in Google Base with Zend Gdata API?

  - by msumme

  I need to get the unique URL identifier for the product that is created after inserting an item into Google Base using the Zend_Gdata_Gbase library. I can't seem to do this. I am finding a startling lack of documentation online about manipulating the objects used in these applications. The url that I add to the object does not work to retrieve the base item later, which is why I need to get the one that google generates upon submission. I am writing a program that will need to be able to delete content at a later date, and thus will need to store that information in order to keep the website synced with the Google Base feed. Thanks in advance for any help.

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• Trying to get Package Version Information to display in an "About" message.

  - by user313135

  Hello, I have been struggling with getting the versionName for a running application from the PackageInfo Object type. I have constructed a Parcelable Interface with all of the fields associated with the PackageInfo Object type. The primary input for that interface method is a Parcel object. I cannot seem to figure out how to correctly associate these Parcelable, Parcel, and PackageInfo objects. Is there any sample code out there that I can look at? Doesn't seem like it should be that difficult but it seems to be stumping me. Thanks Jazz

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• GUI system architecture?

  - by topright

  I'm designing GUI (graphical user interface) system for a game engine (C++). Idea is to create a heirarchy of GUI controllers like Focusable, Hoverable, Dragable etc. Every GUI component can attach multiple controllers, they modify component's behaviour. I think it gives flexible system and protects from code duplication. Different instances of the same GUI class can have different complex behaviours (may be, even change it dynamically), so this approach looks practical. The other choice is to add focused, hovered, dragged etc. flags in the base GUI component class. It looks like overhead and not that flexible. Another solution is to use Decorator pattern and wrap objects with FocusDecorator, HoverDecorator etc. Maintaining such system looks a bit harder. Question: What are pitfalls in my solution? May be you have seen a better approaches in GUI systems? What are the best ways of implementing such flexible complex system?

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• Sharing code between sqlite-net and servicestack ormlite?

  - by lanks

  I am using sqlite-net to store data on my MonoDroid mobile application. I am wanting to sync this data with a server side service as well. Would it be possible to share the code for my Entity objects between sqlite-net and Servicestacks ormlite? The main difference between the two that I can see is declaring the "using namespace" statements at the top of the class for the object. Is it possible to detect the platform and set the using statements based on the platform? The other difference would be referencing the different dlls for servicestack so I suppose on the mobile app it would not compile if there are references to the servicestack namespaces... What would a good approach be to achieve sharing of this code?

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