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  • XNA - Inconsistent accessibility: parameter type is less accessible than method

    - by DijkeMark
    I have a level class in which I make a new turret. I give the turret the level class as parameter. So far so good. Then in the Update function of the Turret I call a function Shoot(), which has that level parameter it got at the moment I created it. But from that moment it gives the following error: Inconsistent accessibility: parameter type 'Space_Game.Level' is less accessible than method 'Space_Game.GameObject.Shoot(Space_Game.Level, string)' All I know it has something to do with not thr right protection level or something like that. The level class: public Level(Game game, Viewport viewport) { _game = game; _viewport = viewport; _turret = new Turret(_game, "blue", this); _turret.SetPosition((_viewport.Width / 2).ToString(), (_viewport.Height / 2).ToString()); } The Turret Class: public Turret(Game game, String team, Level level) :base(game) { _team = team; _level = level; switch (_team) { case "blue": _texture = LoadResources._blue_turret.Texture; _rows = LoadResources._blue_turret.Rows; _columns = LoadResources._blue_turret.Columns; _maxFrameCounter = 10; break; default: break; } _frameCounter = 0; _currentFrame = 0; _currentFrameMultiplier = 1; } public override void Update() { base.Update(); SetRotation(); Shoot(_level, "turret"); } The Shoot Function (Which is in GameObject class. The Turret Class inherited the GameObject Class. (Am I saying that right?)): protected void Shoot(Level level, String type) { MouseState mouse = Mouse.GetState(); if (mouse.LeftButton == ButtonState.Pressed) { switch (_team) { case "blue": switch (type) { case "turret": TurretBullet _turretBullet = new TurretBullet(_game, _team); level.AddProjectile(_turretBullet); break; default: break; } break; default: break; } } } Thanks in Advance, Mark Dijkema

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  • Interpreted vs. Compiled vs. Late-Binding

    - by zubin71
    Python is compiled into an intermediate bytecode(pyc) and then executed. So, there is a compilation followed by interpretation. However, long-time Python users say that Python is a "late-binding" language and that it should`nt be referred to as an interpreted language. How would Python be different from another interpreted language? Could you tell me what "late-binding" means, in the Python context? Java is another language which first has source code compiled into bytecode and then interpreted into bytecode. Is Java an interpreted/compiled language? How is it different from Python in terms of compilation/execution? Java is said to not have, "late-binding". Does this have anything to do with Java programs being slighly faster than Python? Itd be great if you could also give me links to places where people have already discussed this; id love to read more on this. Thank you.

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  • Why does this binding doesn't work through XAML but does by code ?

    - by user361899
    I am trying to bind to a static property on a static class, this property contains settings that are deserialized from a file. It never works with the following XAML : <Window.Resources> <ObjectDataProvider x:Key="wrapper" ObjectType="{x:Type Application:Wrapper}"/> </Window.Resources> <ScrollViewer x:Name="scrollViewer" ScrollViewer.VerticalScrollBarVisibility="Auto"DataContext="{Binding Source={StaticResource wrapper}, UpdateSourceTrigger=PropertyChanged}"> <ComboBox x:Name="comboboxThemes" SelectedIndex="0" SelectionChanged="ComboBoxThemesSelectionChanged" Grid.Column="1" Grid.Row="8" Margin="4,3" ItemsSource="{Binding Settings.Themes, Mode=OneWay}" SelectedValue="{Binding Settings.LastTheme, Mode=TwoWay}" /> It does work by code however : comboboxThemes.ItemsSource = Settings.Themes; Any idea ? Thank you :-)

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  • [Windows 8] Update TextBox’s binding on TextChanged

    - by Benjamin Roux
    Since UpdateSourceTrigger is not available in WinRT we cannot update the text’s binding of a TextBox at will (or at least not easily) especially when using MVVM (I surely don’t want to write behind-code to do that in each of my apps !). Since this kind of demand is frequent (for example to disable of button if the TextBox is empty) I decided to create some attached properties to to simulate this missing behavior. namespace Indeed.Controls { public static class TextBoxEx { public static string GetRealTimeText(TextBox obj) { return (string)obj.GetValue(RealTimeTextProperty); } public static void SetRealTimeText(TextBox obj, string value) { obj.SetValue(RealTimeTextProperty, value); } public static readonly DependencyProperty RealTimeTextProperty = DependencyProperty.RegisterAttached("RealTimeText", typeof(string), typeof(TextBoxEx), null); public static bool GetIsAutoUpdate(TextBox obj) { return (bool)obj.GetValue(IsAutoUpdateProperty); } public static void SetIsAutoUpdate(TextBox obj, bool value) { obj.SetValue(IsAutoUpdateProperty, value); } public static readonly DependencyProperty IsAutoUpdateProperty = DependencyProperty.RegisterAttached("IsAutoUpdate", typeof(bool), typeof(TextBoxEx), new PropertyMetadata(false, OnIsAutoUpdateChanged)); private static void OnIsAutoUpdateChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { var value = (bool)e.NewValue; var textbox = (TextBox)sender; if (value) { Observable.FromEventPattern<TextChangedEventHandler, TextChangedEventArgs>( o => textbox.TextChanged += o, o => textbox.TextChanged -= o) .Do(_ => textbox.SetValue(TextBoxEx.RealTimeTextProperty, textbox.Text)) .Subscribe(); } } } } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } The code is composed of two attached properties. The first one “RealTimeText” reflects the text in real time (updated after each TextChanged event). The second one is only used to enable the functionality. To subscribe to the TextChanged event I used Reactive Extensions (Rx-Metro package in Nuget). If you’re not familiar with this framework just replace the code with a simple: textbox.TextChanged += textbox.SetValue(TextBoxEx.RealTimeTextProperty, textbox.Text); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } To use these attached properties, it’s fairly simple <TextBox Text="{Binding Path=MyProperty, Mode=TwoWay}" ic:TextBoxEx.IsAutoUpdate="True" ic:TextBoxEx.RealTimeText="{Binding Path=MyProperty, Mode=TwoWay}" /> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Just make sure to create a binding (in TwoWay) for both Text and RealTimeText. Hope this helps !

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  • MVC data binding

    - by user441521
    I'm using MVC but I've read that MVVM is sort of about data binding and having pure markup in your views that data bind back to the backend via the data-* attributes. I've looked at knockout but it looks pretty low level and I feel like I can make a library that does this and is much easier to use where basically you only need to call 1 javascript function that will data bind your entire page because of the data-* attributes you assign to html elements. The benefits of this (that I see) is that your view is 100% decoupled from your back-end so that a given view never has to be changed if your back-end changes (ie for asp.net people no more razor in your view that makes your view specific to MS). My question would be, I know there is knockout out there but are there any others that provide this data binding functionality for MVC type applications? I don't want to recreate something that may already exist but I want to make something "better" and easier to use than knockout. To give an example of what I mean here is all the code one would need to get data binding in my library. This isn't final but just showing the idea that all you have to do is call 1 javascript function and set some data-* attribute values and everything ties together. Is this worth seeing through? <script> $(function () { // this is all you have to call to make databinding for POST or GET to work DataBind(); }); </script> <form id="addCustomer" data-bind="Customer" data-controller="Home" data-action="CreateCustomer"> Name: <input type="text" data-bind="Name" data-bind-type="text" /> Birthday: <input type="text" data-bind="Birthday" data-bind-type="text" /> Address: <input type="text" data-bind="Address" data-bind-type="text" /> <input type="submit" value="Save" id="btnSave" /> </form> ================================================= // controller action [HttpPost] public string CreateCustomer(Customer customer) { if(customer.Name == "Rick") return "success"; return "failure"; } // model public class Customer { public string Name { get; set; } public DateTime Birthday { get; set; } public string Address { get; set; } }

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  • How do I resolve the error "Binding already being used by a product other than IIS"

    - by magnifico
    I have an SSL cert with its own unique IP address on a 2008 R2 server. I have created a basic website using IIS Manager, with a file called “Hello.html” in the root. When trying to add an https binding I receive the following error after choosing my certificate: This binding is already being used by a product other than IIS. If you continue you might overwrite the existing certificate for this IP Address:Port combnation. Do you want to use this binding anyway?" I click Yes to this prompt and the binding is created. When I try to retrieve my file using the server’s own browser, the request times out. I have another server which has a shared configuration with this one, and it works fine. Does anyone have any suggestions how to find out which application may be using this binding other than IIS, and how to resolve?

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  • WPF Update Binding when Bound directly to DataContext w/ Converter

    - by Adam
    Normally when you want a databound control to 'update,' you use the "PropertyChanged" event to signal to the interface that the data has changed behind the scenes. For instance, you could have a textblock that is bound to the datacontext with a property "DisplayText" <TextBlock Text="{Binding Path=DisplayText}"/> From here, if the DataContext raises the PropertyChanged event with PropertyName "DisplayText," then this textblock's text should update (assuming you didn't change the Mode of the binding). However, I have a more complicated binding that uses many properties off of the datacontext to determine the final look and feel of the control. To accomplish this, I bind directly to the datacontext and use a converter. In this case I am working with an image source. <Image Source="{Binding Converter={StaticResource ImageConverter}}"/> As you can see, I use a {Binding} with no path to bind directly to the datacontext, and I use an ImageConverter to select the image I'm looking for. But now I have no way (that I know of) to tell that binding to update. I tried raising the propertychanged event with "." as the propertyname, which did not work. Is this possible? Do I have to wrap up the converting logic into a property that the binding can attach to, or is there a way to tell the binding to refresh (without explicitly refreshing the binding)? Any help would be greatly appreciated. Thanks! -Adam

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  • WPF trigger on datagrid to hide/show columns according to bindings

    - by Renan
    I have a data grid like this: <DataGrid AutoGenerateColumns="False" CanUserDeleteRows="True" HorizontalScrollBarVisibility="Hidden" Margin="10,10,10,10" VerticalScrollBarVisibility="Visible" CanUserAddRows="False" ItemsSource="{Binding ListGestores}" ToolTip="Selecione uma linha e pressione DELETE para remover uma unidade."> <DataGrid.Columns> <DataGridTextColumn Binding="{Binding TB_UNIDADE.DS_NOME_UNIDADE}" CanUserResize="False" Header="Setor" IsReadOnly="True" x:Name=""/> <DataGridTextColumn Binding="{Binding TB_UNIDADE.TB_UNIDADE2.DS_NOME_UNIDADE}" CanUserResize="False" Header="Unidade" IsReadOnly="True" x:Name=""/> <DataGridTextColumn Binding="{Binding TB_CONTATOS.DS_NOME}" CanUserResize="False" Header="Gestor" IsReadOnly="True" /> </DataGrid.Columns> </DataGrid> The problem is that i need to verify if the 2 column binding is null, and if it is null, i need to Hide it, and Change the Header of the column 1. I know that i can do that with Triggers, but how exactly??? I started with: <DataGrid.Triggers> <DataTrigger Binding="{Binding TB_UNIDADE.TB_UNIDADE2}" Value="{x:Null}"> <Setter Property="" Value="" /> </DataTrigger> </DataGrid.Triggers> But i don't know what setter or whatever to put ! Help me =]

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  • Bound Command not firing on another viewModel? What Am I doing wrong?

    - by devnet247
    Hi I cannot seem to bind a command to a button.I have a treeview on the left showing Country City etc.. And I tabcontrol on the right. do I This uses 4 viewModels rootviewModel-ContinentViewModel-CountryViewModel-CityViewModel What I am building is based on http://www.codeproject.com/KB/WPF/TreeViewWithViewModel.aspx Now on one of the tabs I have a Toolbar with a button "TestButton" that I have mapped in zaml. This does not fire! The reason is not firing is because I m binding the RootViewModel but the command that is bound in zaml is in the cityViewModel. How Do I pass the datacontext from one view to the other? or how do I make the button fire. I need the command to be in the cityViewModel. Any Suggestions on how I bind it? View "WorldExplorerView" where I bind the main DataContext public partial class WorldExplorerView { public WorldExplorerView() { InitializeComponent(); var continents = Database.GetContinents(); var rootViewModel = new RootViewModel(continents); DataContext = rootViewModel; } } CityViewModel public class CityViewModel : TreeViewItemViewModel { private City _city; private RelayCommand _testCommand; public CityViewModel(City city, CountryViewModel countryViewModel):base(countryViewModel,false) { _city = city; } Properties etc...... public ICommand TestCommand { get { if(_testCommand==null) { _testCommand = new RelayCommand(param => GetTestCommand(), param => CanCallTestCommand); ; } return _testCommand; } } protected bool CanCallTestCommand { get { return true; } } private static void GetTestCommand() { MessageBox.Show("It works"); } } ZAML <DockPanel> <DockPanel LastChildFill="True"> <Label DockPanel.Dock="top" Content="Title " HorizontalAlignment="Center"></Label> <StatusBar DockPanel.Dock="Bottom"> <StatusBarItem Content="Status Bar" ></StatusBarItem> </StatusBar> <Grid DockPanel.Dock="Top"> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="2*"/> </Grid.ColumnDefinitions> <TreeView Name="tree" ItemsSource="{Binding Continents}"> <TreeView.ItemContainerStyle> <Style TargetType="{x:Type TreeViewItem}"> <Setter Property="IsExpanded" Value="{Binding IsExpanded,Mode=TwoWay}"/> <Setter Property="IsSelected" Value="{Binding IsSelected,Mode=TwoWay}"/> <Setter Property="FontWeight" Value="Normal"/> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="FontWeight" Value="Bold"></Setter> </Trigger> </Style.Triggers> </Style> </TreeView.ItemContainerStyle> <TreeView.Resources> <HierarchicalDataTemplate DataType="{x:Type ViewModels:ContinentViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Continent.png"/> <TextBlock Text="{Binding ContinentName}"/> </StackPanel> </HierarchicalDataTemplate> <HierarchicalDataTemplate DataType="{x:Type ViewModels:CountryViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Country.png"/> <TextBlock Text="{Binding CountryName}"/> </StackPanel> </HierarchicalDataTemplate> <DataTemplate DataType="{x:Type ViewModels:CityViewModel}" > <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\City.png"/> <TextBlock Text="{Binding CityName}"/> </StackPanel> </DataTemplate> </TreeView.Resources> </TreeView> <GridSplitter Grid.Row="0" Grid.Column="1" Background="LightGray" Width="5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/> <Grid Grid.Column="2" Margin="5" > <TabControl> <TabItem Header="Demo"> <DockPanel LastChildFill="True"> <ToolBar DockPanel.Dock="Top"> <!-- DOES NOT WORK--> <Button Name="btnTest" Command="{Binding TestCommand}" Content="Press me see if works"></Button> </ToolBar> <TextBox></TextBox> </DockPanel> </TabItem> <TabItem Header="Details" DataContext="{Binding Path=SelectedItem.City, ElementName=tree, Mode=OneWay}"> <StackPanel > <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding CityName}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding Area}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding Population}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding CityDetailsInfo.ClubsCount}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding CityDetailsInfo.PubsCount}"/> </StackPanel> </TabItem> </TabControl> </Grid> </Grid> </DockPanel> </DockPanel>

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  • Howto WCF Service HTTPS Binding and Endpoint Configuration in IIS with Load Balancer?

    - by Mike G
    We have a WCF service that is being hosted on a set of 12 machines. There is a load balancer that is a gateway to these machines. Now the site is setup as SSL; as in a user accesses it through using an URL with https. I know this much, the URL that addresses the site is https, but none of the servers has a https binding or is setup to require SSL. This leads me to believe that the load balancer handles the https and the connection from the balancer to the servers are unencrypted (this takes place behind the firewall so no biggie there). The problem we're having is that when a Silverlight client tries to access a WCF service it is getting a "Not Found" error. I've set up a test site along with our developer machines and have made sure that the bindings and endpoints in the web.config work with the client. It seems to be the case in the production environment that we get this error. Is there anything wrong with the following web.config? Should we be setting up how https is handled in a different manner? We're at a loss on this currently since I've tried every programmatic solution with endpoints and bindings. None of the solutions I have found deal with a load balancer in the manner we're dealing. Web.config service model info: <system.serviceModel> <behaviors> <serviceBehaviors> <behavior name="TradePMR.OMS.Framework.Services.CRM.CRMServiceBehavior"> <serviceMetadata httpsGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> <behavior name="TradePMR.OMS.Framework.Services.AccountAggregation.AccountAggregationBehavior"> <serviceMetadata httpsGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> <bindings> <customBinding> <binding name="SecureCRMCustomBinding"> <binaryMessageEncoding /> <httpsTransport /> </binding> <binding name="SecureAACustomBinding"> <binaryMessageEncoding /> <httpsTransport /> </binding> </customBinding> <mexHttpsBinding> <binding name="SecureMex" /> </mexHttpsBinding> </bindings> <serviceHostingEnvironment aspNetCompatibilityEnabled="true" /> <!--Defines the services to be used in the application--> <services> <service behaviorConfiguration="TradePMR.OMS.Framework.Services.CRM.CRMServiceBehavior" name="TradePMR.OMS.Framework.Services.CRM.CRMService"> <endpoint address="" binding="customBinding" bindingConfiguration="SecureCRMCustomBinding" contract="TradePMR.OMS.Framework.Services.CRM.CRMService" name="SecureCRMEndpoint" /> <!--This is required in order to be able to use the "Update Service Reference" in the Silverlight application--> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> <service behaviorConfiguration="TradePMR.OMS.Framework.Services.AccountAggregation.AccountAggregationBehavior" name="TradePMR.OMS.Framework.Services.AccountAggregation.AccountAggregation"> <endpoint address="" binding="customBinding" bindingConfiguration="SecureAACustomBinding" contract="TradePMR.OMS.Framework.Services.AccountAggregation.AccountAggregation" name="SecureAAEndpoint" /> <!--This is required in order to be able to use the "Update Service Reference" in the Silverlight application--> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> </services> </system.serviceModel> </configuration> The ServiceReferences.ClientConfig looks like this: <configuration> <system.serviceModel> <bindings> <customBinding> <binding name="StandardAAEndpoint"> <binaryMessageEncoding /> <httpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> <binding name="SecureAAEndpoint"> <binaryMessageEncoding /> <httpsTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> <binding name="StandardCRMEndpoint"> <binaryMessageEncoding /> <httpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> <binding name="SecureCRMEndpoint"> <binaryMessageEncoding /> <httpsTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> </customBinding> </bindings> <client> <endpoint address="https://Service2.svc" binding="customBinding" bindingConfiguration="SecureAAEndpoint" contract="AccountAggregationService.AccountAggregation" name="SecureAAEndpoint" /> <endpoint address="https://Service1.svc" binding="customBinding" bindingConfiguration="SecureCRMEndpoint" contract="CRMService.CRMService" name="SecureCRMEndpoint" /> </client> </system.serviceModel> </configuration> (The addresses are of no consequence since those are dynamically built so that they will point to a dev's machine or to the production server)

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  • WPF Binding XAML vs C#

    - by kubal5003
    Hello, I've got a strange problem - binding created through XAML (both ways by markup extension or normal) isn't working(BindingOperations.IsDataBound returns false and in fact there is no Binding object created). When I do literally the same from code everything is working perfectly. One more thing is that the Binding in XAML is created in a DataTemplate - what's funny about that when I use the DataTemplate for the first time it fails, then I fix it from code (add binding to specific objects) and while adding more objects to the collection the binding set in XAML just works. If I try to remove all the objects from the collection and then add a new one the binding fails once again. In reality this is a shortened version of another of my questions. For details please refer to: http://stackoverflow.com/questions/2986511/wpf-debugging-avalonedit-binding-to-document-property Sorry for doing it this way, but there's no answer and it's probably too long for anybody to read. -

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  • Can I set the base path outside of my application directory when binding an image source path to a r

    - by zimmer62
    So I'm trying to display an image that is ouside the path of my application. I only have a relative image path such as "images/background.png" but my images are somewhere else, I might want to choose that base location at runtime so that the binding maps to the proper folder. Such as "e:\data\images\background.png" or "e:\data\theme\images\background.png" <Image Source="{Binding Path=ImagePathWithRelativePath}"/> Is there any way to specify either in XAML or code behind a base directory for those images?

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  • WPF C# how to create THIS binding in code?

    - by 0xDEAD BEEF
    I wonder, how to create this binding, since Line.X2 IS NOT dependency property! :( <Line Y1="0" X1="0" Y2="0" Stroke="Blue" StrokeThickness="3" Margin="0 -2 0 -2" X2="{Binding Path=RenderSize.Width, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type StackPanel}}}"/>

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  • How to trigger binding source update from code in WPF?

    - by Benny
    In My ViewModel class I have a property: class ViewModel { public string FileName {get;set;} } and in my View I bind a label's content to ViewModel's FileName. now When I do drag-drop a file to my View, How can I update the label's Content property, so that the ViewMode's FileName also get updated via binding? Directly set the label's Content property won't work, it just simply clear the binding.

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  • Is there a way to do simple calculations in a xaml element binding statement other than using a conv

    - by Jonathan Websdale
    In XAML I want to bind the height of one element to be half the height of another element. Is there a way to do this that doesn't involve writing a converter in the code-behind? Example:- What I've got... <Button Name="RemoveButton" Content="Remove Stage" Width="100" Height="{Binding ElementName=AddButton, Path=Height, Converter={StaticResource MyHalfHeightConverter}}"/> What I'd like... <Button Name="RemoveButton" Content="Remove Stage" Width="100" Height="{Binding ElementName=AddButton, Path=(Height / 2.0)}"/>

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  • Parameter _rollback_segment_count can cause trouble

    - by Mike Dietrich
    Just some weeks ago we've learned that setting the hidden underscore parameter: _rollback_segment_count may cause trouble during upgrade. This parameter is used in very rare cases to have under all circumstances and situations this specified number of UNDO's online. Now during upgrade this may result in massive latch contention due to bug14226559 - and there's a patch available as well. Recommendation is to unset it during upgrade. I don't think that many people will hit this as I personally haven't seen databases with this underscore in their init.ora or spfiles. So take this post more or less as a reminder for myself

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  • Question about Target parameter of Matrix.CreateLookAt

    - by manning18
    I have a newbie question that's causing me a little bit of confusion when experimenting with cameras and reading other peoples implementations - does this parameter represent a point or a vector? In some examples I've seen people treat it like a specific point they are looking at (eg a position in the world), other times I see people caching the orientation of the camera in a rotation matrix and simply using the Matrix.Forward property as the "target", and other times it's a vector that's the result of targetPos - camPos and also I saw a camPos + orientation.Forward I was also just playing around with hard-coded target positions with same direction eg 1 to 10000 with no discernible difference in what I saw in the scene. Is the "Target" parameter actually a position or a direction (irrespective of magnitude)? Are there any subtle differences in behaviors, common mistakes or gotchas that are associated with what values you provide, or HOW you provide this paramter? Are all the methods I mentioned above equivalent? (sorry, I've only recently started and my math is still catching up)

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  • Sending a android.content.Context parameter to a function with JNI

    - by Ef Es
    I am trying to create a method that checks for internet connection that needs a Context parameter. The JNIHelper allows me to call static functions with parameters, but I don't know how to "retrieve" Cocos2d-x Activity class to use it as a parameter. public static boolean isNetworkAvailable(Context context) { boolean haveConnectedWifi = false; boolean haveConnectedMobile = false; ConnectivityManager cm = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE); NetworkInfo[] netInfo = cm.getAllNetworkInfo(); for (NetworkInfo ni : netInfo) { if (ni.getTypeName().equalsIgnoreCase("WIFI")) if (ni.isConnected()) haveConnectedWifi = true; if (ni.getTypeName().equalsIgnoreCase("MOBILE")) if (ni.isConnected()) haveConnectedMobile = true; } return haveConnectedWifi || haveConnectedMobile; } and the c++ code is JniMethodInfo methodInfo; if ( !JniHelper::getStaticMethodInfo( methodInfo, "my/app/TestApp", "isNetworkAvailable", "(android/content/Context;)V")) { //error return; } CCLog( "Method found and loaded!"); methodInfo.env->CallStaticVoidMethod( methodInfo.classID, methodInfo.methodID); methodInfo.env->DeleteLocalRef( methodInfo.classID);

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  • Simplifying C++11 optimal parameter passing when a copy is needed

    - by Mr.C64
    It seems to me that in C++11 lots of attention was made to simplify returning values from functions and methods, i.e.: with move semantics it's possible to simply return heavy-to-copy but cheap-to-move values (while in C++98/03 the general guideline was to use output parameters via non-const references or pointers), e.g.: // C++11 style vector<string> MakeAVeryBigStringList(); // C++98/03 style void MakeAVeryBigStringList(vector<string>& result); On the other side, it seems to me that more work should be done on input parameter passing, in particular when a copy of an input parameter is needed, e.g. in constructors and setters. My understanding is that the best technique in this case is to use templates and std::forward<>, e.g. (following the pattern of this answer on C++11 optimal parameter passing): class Person { std::string m_name; public: template <class T, class = typename std::enable_if < std::is_constructible<std::string, T>::value >::type> explicit Person(T&& name) : m_name(std::forward<T>(name)) { } ... }; A similar code could be written for setters. Frankly, this code seems boilerplate and complex, and doesn't scale up well when there are more parameters (e.g. if a surname attribute is added to the above class). Would it be possible to add a new feature to C++11 to simplify code like this (just like lambdas simplify C++98/03 code with functors in several cases)? I was thinking of a syntax with some special character, like @ (since introducing a &&& in addition to && would be too much typing :) e.g.: class Person { std::string m_name; public: /* Simplified syntax to produce boilerplate code like this: template <class T, class = typename std::enable_if < std::is_constructible<std::string, T>::value >::type> */ explicit Person(std::string@ name) : m_name(name) // implicit std::forward as well { } ... }; This would be very convenient also for more complex cases involving more parameters, e.g. Person(std::string@ name, std::string@ surname) : m_name(name), m_surname(surname) { } Would it be possible to add a simplified convenient syntax like this in C++? What would be the downsides of such a syntax?

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  • Getting the keyword as a parameter from Adwords using ValueTrack

    - by Stephen Ostermiller
    I set up an AdWords campaign for website following the instructions for Google AdWords ValueTrack. One of the things that it is supposed to be able to do is pass the keyword as a URL parameter using the code {keyword} in the URL. I set it up for integration with Google Analytics such the landing URLs would look like: http://example.com/landing.html?utm_source=adwords&utm_medium=cpc&utm_term=%7Bkeyword%7D&utm_content=my_content&utm_campaign=my_page where {keyword} is in the utm_term parameter. Hower, this keyword substitution isn't happening. Why?

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