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  • "Object reference not set to an instance of an object": why can't .NET show more details?

    - by Simon Chadwick
    "Object reference not set to an instance of an object" This is probably one of the most common run-time errors in .NET. Although the System.Exception has a stack trace, why does the exception not also show the name of the object reference field, or at least its type? Over the course of a year I spend hours sifting through stack traces (often in code I did not write), hoping there is a line number from a ".pdb" file, then finding the line in the code, and even then it is often not obvious which reference on the line was null. Having the name of the reference field would be very convenient. If System.ArgumentNullException instances can show the name of the method parameter ("Value cannot be null. Parameter name: value"), then surely System.NullReferenceException instances could include the name of the null field (or its containing collection).

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  • python manage.py runserver fails

    - by Randy Simon
    I am trying to learn django by following along with this tutorial. I am using django version 1.1.1 I run django-admin.py startproject mysite and it creates the files it should. Then I try to start the server by running python manage.py runserver but here is where I get the following error. Traceback (most recent call last): File "manage.py", line 11, in <module> execute_manager(settings) File "/Library/Python/2.6/site-packages/django/core/management/__init__.py", line 362, in execute_manager utility.execute() File "/Library/Python/2.6/site-packages/django/core/management/__init__.py", line 303, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 195, in run_from_argv self.execute(*args, **options.__dict__) File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 213, in execute translation.activate('en-us') File "/Library/Python/2.6/site-packages/django/utils/translation/__init__.py", line 73, in activate return real_activate(language) File "/Library/Python/2.6/site-packages/django/utils/translation/__init__.py", line 43, in delayed_loader return g['real_%s' % caller](*args, **kwargs) File "/Library/Python/2.6/site-packages/django/utils/translation/trans_real.py", line 205, in activate _active[currentThread()] = translation(language) File "/Library/Python/2.6/site-packages/django/utils/translation/trans_real.py", line 194, in translation default_translation = _fetch(settings.LANGUAGE_CODE) File "/Library/Python/2.6/site-packages/django/utils/translation/trans_real.py", line 172, in _fetch for localepath in settings.LOCALE_PATHS: File "/Library/Python/2.6/site-packages/django/utils/functional.py", line 273, in __getattr__ return getattr(self._wrapped, name) AttributeError: 'Settings' object has no attribute 'LOCALE_PATHS' Now, I can add a LOCALE_PATH atribute and set to an empty tuple to my settings.py file but then it just complains about another setting and so on. What am I missing here?

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  • Caliburn and prism samples

    - by Simon
    Are there any sample applications avaliable that make use of both caliburn and prism? I know there are blogs that talk about it but I would like to wade into some code and see how it all fits together. http://caliburn.codeplex.com http://compositewpf.codeplex.com/

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  • Xcode: Internal error occurred while creating dependency graph

    - by Randy Simon
    I just started getting this error today, seemingly out of nowhere. Any one see this before and know what causes it. Internal error occurred while creating dependency graph: *** -[NSCFArray initWithObjects:count:]: attempt to insert nil object at objects[10] This happens when I try to build with "iPhone Device 3.x" selected. However, if I select "iPhone Simulator 3.x", everything is fine.

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  • Winrar sfx deletes files too early

    - by Simon Ottenhaus
    I'm trying to build a sfx (self extracting archive) using winrar. I'm using VS2008 to build a setup.exe and a myapp.msi. If setup.exe is executed it does some checking an launches myapp.msi I'm using some sfx options to make the extraction quiet and make it extract so some temp folder: ;Der folgende Kommentar enthält SFX-Skriptbefehle Setup=setup.exe TempMode Silent=2 Overwrite=1 It seems winrar deletes the msi right after setup.exe is launched. Setup.exe can't find the msi and crashes. Is there some way to fix this?

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  • AppDomain.CurrentDomain.UnhandledException doesn't always fire up

    - by Simon T.
    I encountered an exception in our application that isn't handled at all. I really don't know what to look for to debug this problem since the application close immediately when this peculiar exception is thrown (even running from VS). The exception handling is setup that way: [STAThread] [LoaderOptimizationAttribute(LoaderOptimization.MultiDomainHost)] static void Main() { Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException); Application.ApplicationExit += new EventHandler(ApplicationExitHandler); Application.ThreadException += new ThreadExceptionEventHandler(ThreadExceptionHandler); AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(UnhandledExceptionHandler); ... The thread from which the exception is thrown is started that way: Thread executerThread = new Thread(new ThreadStart(modele.Exporter)); executerThread.SetApartmentState(ApartmentState.STA); executerThread.Start(); Now, every unhandled exception thrown from that thread fire up our UnhandledExceptionHandler except the one I have problems with. Even if I catch the problematic exception and throw it again, the application closes silently. None of the 3 handlers (ApplicationExit, ThreadException, UnhandledException) get fired (breakpoints not hit). There is nothing so exceptional in that exception (see details here: http://pastebin.com/fCnDRRiJ).

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  • OpenFileDialog RestoreDirectory as no effect if Multiselect is set to true

    - by Simon T.
    We use OpenFileDialog across our application to select files. So far, we never used Multiselect. We set RestoreDirectory to true so that any time we open the dialog we get the user to the last directory used. If I set Multiselect to true, the directory from which the files are selected is not remembered. The dialog shows the last directory used when Multiselect was set to false. By the way, we create a new instance of OpenFileDialog. The environment: Windows XP VS 2008 targeting framework 3.5 C#

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  • System.StackOverflowException by forms

    - by simon
    I'm trying to open another form with a button and it's only ok at the beginning. After a few forms made the stackoverflow error acours ! i get errors everytime i declare a new form, like this: Form5 add_meal = new Form5(); private void button1_Click(object sender, EventArgs e) { add_meal.Show(); this.Hide(); }

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  • Compare date from database using parameters

    - by Simon
    string queryString = "SELECT SUM(skupaj_kalorij)as Skupaj_Kalorij " + "FROM (obroki_save LEFT JOIN users ON obroki_save.ID_uporabnika=users.ID)" + "WHERE (users.ID= " + a.ToString() + ") AND (obroki_save.datum= @datum)"; using (OleDbCommand cmd = new OleDbCommand(queryString,database)) { DateTime datum = DateTime.Today; cmd.Parameters.AddWithValue("@datum", datum); } loadDataGrid2(queryString); I tried now with parameters. But i don't really know how to do it correctly. I tried like this, but the parameter datum doesn't get any value(according to c#).

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  • What does "<<" mean in C#?

    - by Simon G
    Hi, Basically the questions in the title. I'm looking at the MVC 2 source code: public enum HttpVerbs { Get = 1 << 0, Post = 1 << 1, Put = 1 << 2, Delete = 1 << 3, Head = 1 << 4 } and I'm just curious as to what "<<" does. Thanks

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  • Multiple comosite applications on same WSDL endpoint with OPEN-ESB

    - by Simon Thompson
    Just learning how Open-ESB (GlassFishESB) works and evaluating it for a project. One point I do not understand is that if I have a Composite application bound to an incoming web service (hosted on the glassfish server) can I get muple composite applications to consume this message ? If so is it done by A) simply deploying the multiple composite applications each referencing the save URL and same WSDL B) include each JBI module in the CASA editor and deploy a single composite application with all parts included (will this reduce scaling?) C) create a new composite application which has a BPEL process to send the in message to new endpoints for each compisite applciation . My feeling is that option A should work?

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  • Looking for ideas how to refactor my (complex) algorithm

    - by _simon_
    I am trying to write my own Game of Life, with my own set of rules. First 'concept', which I would like to apply, is socialization (which basicaly means if the cell wants to be alone or in a group with other cells). Data structure is 2-dimensional array (for now). In order to be able to move a cell to/away from a group of another cells, I need to determine where to move it. The idea is, that I evaluate all the cells in the area (neighbours) and get a vector, which tells me where to move the cell. Size of the vector is 0 or 1 (don't move or move) and the angle is array of directions (up, down, right, left). This is a image with representation of forces to a cell, like I imagined it (but reach could be more than 5): Let's for example take this picture: Forces from lower left neighbour: down (0), up (2), right (2), left (0) Forces from right neighbour : down (0), up (0), right (0), left (2) sum : down (0), up (2), right (0), left (0) So the cell should go up. I could write an algorithm with a lot of if statements and check all cells in the neighbourhood. Of course this algorithm would be easiest if the 'reach' parameter is set to 1 (first column on picture 1). But what if I change reach parameter to 10 for example? I would need to write an algorithm for each 'reach' parameter in advance... How can I avoid this (notice, that the force is growing potentialy (1, 2, 4, 8, 16, 32,...))? Can I use specific design pattern for this problem? Also: the most important thing is not speed, but to be able to extend initial logic. Things to take into consideration: reach should be passed as a parameter i would like to change function, which calculates force (potential, fibonacci) a cell can go to a new place only if this new place is not populated watch for corners (you can't evaluate right and top neighbours in top-right corner for example)

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  • HtmlHelper Getting the route name

    - by Simon G
    Hi, I've created a html helper that adds a css class property to a li item if the user is on the current page. The helper looks like this: public static string MenuItem( this HtmlHelper helper, string linkText, string actionName, string controllerName, object routeValues, object htmlAttributes ) { string currentControllerName = ( string )helper.ViewContext.RouteData.Values["controller"]; string currentActionName = ( string )helper.ViewContext.RouteData.Values["action"]; var builder = new TagBuilder( "li" ); // Add selected class if ( currentControllerName.Equals( controllerName, StringComparison.CurrentCultureIgnoreCase ) && currentActionName.Equals( actionName, StringComparison.CurrentCultureIgnoreCase ) ) builder.AddCssClass( "active" ); // Add link builder.InnerHtml = helper.ActionLink( linkText, actionName, controllerName, routeValues, htmlAttributes ); // Render Tag Builder return builder.ToString( TagRenderMode.Normal ); } I want to expand this class so I can pass a route name to the helper and if the user is on that route then it adds the css class to the li item. However I'm having difficulty finding the route the user is on. Is this possible? The code I have so far is: public static string MenuItem( this HtmlHelper helper, string linkText, string routeName, object routeValues, object htmlAttributes ) { string currentControllerName = ( string )helper.ViewContext.RouteData.Values["controller"]; string currentActionName = ( string )helper.ViewContext.RouteData.Values["action"]; var builder = new TagBuilder( "li" ); // Add selected class // Some code for here // if ( routeName == currentRoute ) AddCssClass; // Add link builder.InnerHtml = helper.RouteLink( linkText, routeName, routeValues, htmlAttributes ); // Render Tag Builder return builder.ToString( TagRenderMode.Normal ); } BTW I'm using MVC 1.0. Thanks

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  • Group by and order by

    - by Simon Thompson
    using LINQ to NHibernate does anybody know how to use group by and order by in the same expression. I am having to execute the group by into a list and then order this, seem that I am missing soemthing here ??? Example:- Private function LoadStats(...) ... Dim StatRepos As DataAccess.StatsExtraction_vwRepository = New DataAccess.StatsExtraction_vwRepository return (From x In StatRepos.GetAnswers(Question, Questionnaire) _ Group x By xData = x.Data Into Count() _ Select New ChartData With {.TheData = xData, .TheValue = xData.Count} ).ToList.OrderBy(Function(x) x.TheData) End Sub

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  • Mouse position in xaml - wpf

    - by Simon Fox
    Hi all Is it possible to specify the position of the mouse as the value of the Parameter property of a Command in XAML. Something like the following: <UserControl.ContextMenu> <ContextMenu> <MenuItem Header="Create Link" Command="{Binding CreateLink}" CommandParameter="{Binding Mouse.Position}" > </MenuItem> </ContextMenu> </UserControl.ContextMenu>

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  • Monitoring pthread context switching

    - by simon
    I would like to monitor the the context switching behavior in a multi-threaded pthread application. In other RTOSes(Micro C OS) I have been able to register a context switch callback for each thread in the application, and then log (or toggle a gpio) and watch the thread context switching in real time. This was a valuable tool for debugging the real time behavior and interaction of the multiple threads. My current environment is embedded linux utilizing the pthread api. Is there a way to montior each of the context switches?

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  • Running windows 7 on a Mac Pro

    - by Simon
    My question is simple is running windows 7 on a mac pro as the dominat OS a bad idea? im interested in starting some mac programing but still want to do windows based coding. im tossing up between a macbook pro + a desktop or just a Mac pro. Also what development tools are available for mac?

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  • MVVM, ContextMenus and binding to ViewModel defined Command

    - by Simon Fox
    Hi I am having problems with the binding of a ContextMenu command to an ICommand property in my ViewModel. The binding seems to be attaching fine...i.e when I inspect the value of the ICommand property it is bound to an instance of RelayCommand. The CanExecute delegate does get invoked, however when I open the context menu and select an item the Execute delegate does not get invoked. Heres my View (which is defined as the DataTemplate to use for instances of the following ViewModel in a resource dictionary): <UserControl x:Class="SmartSystems.DragDropProto.ProductLinkView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:Proto"> <UserControl.Resources> <local:CenteringConverter x:Key="centeringConvertor"> </local:CenteringConverter> </UserControl.Resources> <UserControl.ContextMenu> <ContextMenu> <MenuItem Command="{Binding ChangeColor}">Change Color</MenuItem> </ContextMenu> </UserControl.ContextMenu> <Canvas> <Ellipse Width="5" Height="5" > <Ellipse.Fill> <SolidColorBrush Color="{Binding LinkColor}"></SolidColorBrush> </Ellipse.Fill> <Ellipse.RenderTransform> <TranslateTransform X="{Binding EndpointOneXPos, Converter={StaticResource centeringConvertor}}" Y="{Binding EndpointOneYPos, Converter={StaticResource centeringConvertor}}"/> </Ellipse.RenderTransform> </Ellipse> <Line X1="{Binding Path=EndpointOneXPos}" Y1="{Binding Path=EndpointOneYPos}" X2="{Binding Path=EndpointTwoXPos}" Y2="{Binding Path=EndpointTwoYPos}"> <Line.Stroke> <SolidColorBrush Color="{Binding LinkColor}"></SolidColorBrush> </Line.Stroke> </Line> <Ellipse Width="5" Height="5" > <Ellipse.Fill> <SolidColorBrush Color="{Binding LinkColor}"></SolidColorBrush> </Ellipse.Fill> <Ellipse.RenderTransform> <TranslateTransform X="{Binding EndpointTwoXPos, Converter={StaticResource centeringConvertor}}" Y="{Binding EndpointTwoYPos, Converter={StaticResource centeringConvertor}}"/> </Ellipse.RenderTransform> </Ellipse> </Canvas> </UserControl> and ViewModel (with uneccessary implementation details removed): class ProductLinkViewModel : BaseViewModel { public ICommand ChangeColor { get; private set; } public Color LinkColor { get; private set; } public ProductLinkViewModel(....) { ... ChangeColor = new RelayCommand(ChangeColorAction); LinkColor = Colors.Blue; } private void ChangeColorAction(object param) { LinkColor = LinkColor == Colors.Blue ? Colors.Red : Colors.Blue; OnPropertyChanged("LinkColor"); } }

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  • The speed of Ruby and Java.

    - by Simon
    In every benchmark that I found on the web it seems that Ruby is slow, much slower than Java. The Ruby folks just state that it doesn't matter. Could you give me any example that the speed of Ruby on Rails (and the Ruby itself) really doesn't matter?

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  • How do I prevent Eclipse from hanging on startup?

    - by Simon Nickerson
    I am using Eclipse 3.3 ("Europa"). Periodically, Eclipse takes an inordinately long time (perhaps forever) to start up. The only thing I can see in the Eclipse log is: !ENTRY org.eclipse.core.resources 2 10035 2008-10-16 09:47:34.801 !MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes. Googling reveals someone's suggestion that I remove the folder: workspace\.metadata\.plugins\org.eclipse.core.resources\.root\.indexes This does not appear to have helped. Short of starting with a new workspace (something which I am not keen to do, as it takes me hours to set up all my projects again properly), is there a way to make Eclipse start up properly?

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  • Determing size of visible area of a ScrollingGraphicalViewer in Eclipse GEF

    - by Simon
    I am attempting to create a simple application using Eclipse GEF that displays a diagram inside a ScrollingGraphicalViewer. On start-up I want the diagram to be centered inside the viewer (imagine a star layout where the center of the star is in the center of the view). Here are what I think are the relevant code sections: My view: public class View extends ViewPart { public static final String ID = "GEFProofOfConcept.view"; ... public void createPartControl(Composite parent) { viewer.createControl(parent); viewer.setRootEditPart(rootEditPart); viewer.setEditPartFactory(editPartFactory); viewer.setContents(DummyModelCreator.generateModel()); } The edit part code: @Override protected void refreshVisuals() { Project project = (Project) getModel(); // This is where the actual drawing is done, // Simply a rectangle with text Rectangle bounds = new Rectangle(50, 50, 75, 50); getFigure().setBounds(bounds); Label label = new Label(project.getName()); projectFont = new Font(null, "Arial", 6, SWT.NORMAL); label.setFont(projectFont); label.setTextAlignment(PositionConstants.CENTER); label.setBounds(bounds.crop(IFigure.NO_INSETS)); getFigure().add(label); setLocation(); } private void setLocation() { Project project = (Project) getModel(); if (project.isRoot()) { // Place in centre of the layout Point centrePoint = new Point(0, 0); // This is where I need the center of the view getFigure().setLocation(centrePoint); } else { ... } } And the parent of the above edit part: public class ProjectDependencyModelEditPart extends AbstractGraphicalEditPart { @Override protected IFigure createFigure() { Figure f = new FreeformLayer(); f.setLayoutManager(new XYLayout()); return f; } ... Alternative solutions to the problem also welcome, I am most certainly a GEF (and Eclipse in general) newbie.

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