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• Objective-C method implementation nuances

  - by altdotnetgeek

  I have just started to develop for the iPhone and am in the process of learning Objective-C. I have seen some code that implements a method in the @implementation side of a class like this: -(void)myMethod; { // method body } What makes this interesting is that there is no mention of myMethod in the @interface for the class. I tried a sample project with this and when I compile I get a warning from XCode that myMethod may not be seen by the calling code. Can anyone tell me what is going on? Thanks!

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• Does the specific signed integer matter when implementing compareTo in a Comparable <Type> class?

  - by javanix

  When implementing compareTo(), does the degree of "difference" need to be taken into account? For instance, if I have 3 objects, C1, C2, and C3, such that C1 < C2 < C3. Should C1.compareTo(C2) return an integer that is less than C2.compareTo(C3)? The documentation for the Comparable interface doesn't seem to specify one way or another, so I'm guessing the degree doesn't matter, but it would be nice to know if there is some advantage returning a specific number (for example, improving TreeSet sort speed or something). http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Comparable.html#compareTo(T)

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• cast across classloader?

  - by IttayD

  How can I do this: class Foo { public static Foo get() throws Exception { ClassLoader cl = new URLClassLoader(new URL[]{"foo.jar"}, null); // Foo.class is in foo.jar return (Foo)cl.loadClass("Foo").newInstance(); // fails on class cast } } What I need is for the JVM to consider the Foo instance from cl as if it is an instance of Foo from the classloader of the executing code. I have seen these approaches, none of them good for me (the above example is a toy example): Load the class (or a separate interface) by a class loader that is a parent of both the calling code and created classloader Serialize and deserialize the object.

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• IWebBrowser: How to specify the encoding when loading html from a stream?

  - by Ian Boyd

  Using the concepts from the sample code provided by Microsoft for loading HTML content into an IWebBrowser from an IStream using the web browser's IPersistStreamInit interface: HRESULT LoadWebBrowserFromStream(IWebBrowser* pWebBrowser, IStream* pStream) { [snip] } How can one specify the encoding of the html inside the IStream? The IStream will contain a series of bytes, but the problem is what do those bytes represent? They could, for example, contain bytes where: each byte represents a character from the current Windows code-page (e.g. 1252) each byte could represent a character from the ISO-8859-1 character set the bytes could represent UTF-8 encoded characters every 2 bytes could represent a character, using UTF-16 encoding In my particular case, i am providing the IWebBrowser an IStream that contains a series of double-bytes characters (UTF-16), but the browser (incorrectly) believes that UTF-8 encoding is in effect. This results in garbled characters.

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• Django make model field name a link

  - by Daniel Garcia

  what Im looking to do is to have a link on the name of a field of a model. So when im filling the form using the admin interface i can access some information. I know this doesn't work but shows what i want to do class A(models.Model): item_type = models.CharField(max_length=100, choices=ITEMTYPE_CHOICES, verbose_name="<a href='http://www.quackit.com/html/codes'>Item Type</a>") Other option would be to put a description next to the field. Im not even sure where to start from.

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• How to use DAOs with hibernate/jpa?

  - by Ari

  Assuming the DAO structure and component interaction described below, how should DAOs be used with persistence layers like hibernate and toplink? What methods should/shouldn't they contain? Would it be bad practice to move the code from the DAO directly to the service? For example, let's say that for every model we have a DAO (that may or may not implement a base interface) that looks something like the following: public class BasicDao<T> { public List<T> list() { ... } public <T> retrieve() { ... } public void save() { ... } public void delete() { ... } } Component interaction pattern is -- service DAO model

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• VB.NET - Read lines from command line to Windows form possible?

  - by Yiu Korochko

  Hey Overflow, I have an application which serves as a user interface for a spartan/command line program. I have the program running on a separate process, and my application monitors it to see if it is responding and how mush CPU it is utilising. Now I have a list of files in my program (listbox) which are to be sent to the application, which happens fine. But I want to be able to read text from the com-line so as to determine when the first file has been processed. Com-line says one of "selecting settings", "unsupported format" and "cannot be fixed". What I want to be able to do is when it says one of these three things, remove item(0) in listbox1. Is this possible? I thought of programming an event which handles com_exe.print or something or other, if possible.

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• Trouble using CollectionViewSource in Silverlight

  - by Johnny

  Hi, I having some trouble when implementing the CollectionViewSource in silverlight. I'm new in this topic, so basically I've been following what I find searching through the web. Here's what I've been trying to do so far. I'm creating a CollectionViewSource in the resources tag: <UserControl.Resources> <CollectionViewSource x:Key="TestCVS"> <CollectionViewSource.SortDescriptions> <scm:SortDescription PropertyName="Value" Direction="Ascending" /> </CollectionViewSource.SortDescriptions> </CollectionViewSource> </UserControl.Resources> Then I'm binding my TestCVS in a HierarchicalDataTemplate: <common:HierarchicalDataTemplate ItemsSource="{Binding Source={StaticResource TestCVS}}"> <common:HierarchicalDataTemplate.ItemTemplate> <common:HierarchicalDataTemplate> <Border BorderBrush="#FF464646" BorderThickness="1" CornerRadius="3" Padding="5"> <Grid> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <StackPanel Orientation="Horizontal" HorizontalAlignment="Left"> <TextBlock TextWrapping="Wrap" Text="{Binding MyClassField}"/> </StackPanel> </Grid> </Border> </common:HierarchicalDataTemplate> </common:HierarchicalDataTemplate.ItemTemplate> </common:HierarchicalDataTemplate> Now, in the code behind I'm assigning the Source for the TestCVS in a property, like this: private ObservableCollection<MyClass> _MyClass; public ObservableCollection<MyClass> MyClass { get { return _MyClass; } set { var testCVS = (this.Resources["TestCVS"] as CollectionViewSource); if (testCVS != null) testCVS.Source = value; } } After testing this I realize that the information is not showing on screen and I don't really know why, can anyone help me on this matter? Hope this makes any sense, thanks in advance!

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• lowest latency, least overhead app server?

  - by Mark Harrison

  I'm designing an application which will have a network interface for feeding out large numbers of very small metadata requests. The application code itself is very fast, basically looking up data cached in memory and sending it to the client. What's the absolute lowest latency I can get for a network application server running on a linux box? This will be an internal app running on gigE with no authentication. Any language/framework considered, with a preference for C, C++, or Python. Likewise for protocol, although HTTP would be nice.

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• WPF TreeView: How to style selected items with rounded corners like in Explorer

  - by Helge Klein

  The selected item in a WPF TreeView has a dark blue background with "sharp" corners. That looks a bit dated today: I would like to change the background to look like in Explorer of Windows 7 (with/without focus): What I tried so far does not remove the original dark blue background but paints a rounded border on top of it so that you see the dark blue color at the edges and at the left side - ugly. Interestingly, when my version does not have the focus, it looks pretty OK: I would like to refrain from redefining the control template as shown here or here. I want to set the minimum required properties to make the selected item look like in Explorer. Alternative: I would also be happy to have the focused selected item look like mine does now when it does not have the focus. When losing the focus, the color should change from blue to grey. Here is my code: <TreeView x:Name="TreeView" ItemsSource="{Binding TopLevelNodes}" VirtualizingStackPanel.IsVirtualizing="True" VirtualizingStackPanel.VirtualizationMode="Recycling"> <TreeView.ItemContainerStyle> <Style TargetType="{x:Type TreeViewItem}"> <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" /> <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" /> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="BorderBrush" Value="#FF7DA2CE" /> <Setter Property="Background" Value="#FFCCE2FC" /> </Trigger> </Style.Triggers> </Style> </TreeView.ItemContainerStyle> <TreeView.Resources> <HierarchicalDataTemplate DataType="{x:Type viewmodels:ObjectBaseViewModel}" ItemsSource="{Binding Children}"> <Border Name="ItemBorder" CornerRadius="2" Background="{Binding Background, RelativeSource={RelativeSource AncestorType=TreeViewItem}}" BorderBrush="{Binding BorderBrush, RelativeSource={RelativeSource AncestorType=TreeViewItem}}" BorderThickness="1"> <StackPanel Orientation="Horizontal" Margin="2"> <Image Name="icon" Source="/ExplorerTreeView/Images/folder.png"/> <TextBlock Text="{Binding Name}"/> </StackPanel> </Border> </HierarchicalDataTemplate> </TreeView.Resources> </TreeView>

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• RabbitMQ serializing messages from queue with multiple consumers

  - by Refefer

  Hi there, I'm having a problem where I have a queue set up in shared mode and multiple consumers bound to it. The issue is that it appears that rabbitmq is serializing the messages, that is, only one consumer at a time is able to run. I need this to be parallel, however, I can't seem to figure out how. Each consumer is running in its own process. There are plenty of messages in the queue. I'm using py-amqplib to interface with RabbitMQ. Any thoughts?

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• Bind a java class as a closure into a groovy-script

  - by chrsk

  Is it possible to bind a closure written in java into a groovy-script. Is there an interface or something to implement so i can provide a closure? Something like this? public class Example implements Closure { public void closure(Object... args) { System.out.println(args[0]); } } Bind this into the groovyscript. Binding binding = new Binding(); binding.put("example", new Example()); groovyScriptEngine.run("foo.groovy", binding) and use it in the foo.groovy like this: example("Hello World")

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• How can I use Perl and RRD to plot ping times?

  - by ChrisMuench

  I'm trying to do my first rrd graph through Perl. I have tried RRD::Simple and rrds and just can't get either one to work. Here's what I have so far: use strict; use RRD::Simple (); # Create an interface object my $rrd = RRD::Simple-new( file = "server.rrd" ); # Put some arbitary data values in the RRD file for the same # 3 data sources called bytesIn, bytesOut and faultsPerSec. $rrd-create( EqSearch = "DERIVE", MfSearch = "DERIVE", EQCostBasis = "DERIVE", MFCostBasis = "DERIVE" ); $rrd-update( EqSearch = 2, MfSearch = 3, EQCostBasis = 10, MFCostBasis = 15 ); # Generate graphs: # /var/tmp/myfile-daily.png, /var/tmp/myfile-weekly.png # /var/tmp/myfile-monthly.png, /var/tmp/myfile-annual.png my %rtn = $rrd-graph( destination = "/Users/cmuench/Documents/Code/perl", title = "Server A", vertical_label = "", interlaced = "", periods = [qw(hour)] );

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• Using Office 2010 web apps with ASP.NET

  - by Martin de Ruiter

  Would it be possible to use the Office 2010 web apps with an ASP.NET application? For example: - For each user of my ASP.NET application there is a folder with Word documents on my server - The ASP.NET application displays the available documents in a grid to the user - When clicking on one of the documents in the grid, the Word document is loaded in an IFrame which contains the Office 2010 web apps Word interface and editing of the document can take place - After editing, the document can be saved to the server, and the ASP.NET grid displays an updated status Would such a scenario be possible? And what do you need, e.g. Sharepoint, Office 2010 licenses?

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• How to change current Theme at runtime in Android

  - by Guido

  I've created a PreferenceActivity that allows the user to choose the theme he wants to apply to the entire application. When the users selects a theme, this code is executed: if (...) { getApplication().setTheme(R.style.BlackTheme); } else { getApplication().setTheme(R.style.LightTheme); } But, despite I've checked with the debugger that the code is being executed, I can't see any change in the user interface. Themes are defined in res/values/styles.xml, and Eclipse does not show any error. <resources> <style name="LightTheme" parent="@android:style/Theme.Light"> </style> <style name="BlackTheme" parent="@android:style/Theme.Black"> </style> </resources> Any idea about what could be happening and how to fix it? Thank you.

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• subclassing and data contracts

  - by Sergio Romero

  I'm playing with the following code: [ServiceContract] public interface IUserAccountService { [OperationContract] UserAccountResponse CreateNewUserAccount(UserAccountRequest userAccountRequest); } public abstract class BaseResponse { public bool Success { get; set; } public string Message { get; set; } } public class UserAccountResponse : BaseResponse { public int NewUserId { get; set; } } My questions are: Do I need to add the DataContract attribute to both the abstract class and the subclass? If the abstract class does not need the DataContract attribute, can I add the DataMember attribure to its properties?

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• What is common case for @dynamic usage ?

  - by Forrest

  There is previous post about difference of @synthesize and @dynamic. I wanna to know more about dynamic from the perspective of how to use @dynamic usually. Usually we use @dynamic together with NSManagedObject // Movie.h @interface Movie : NSManagedObject { } @property (retain) NSString* title; @end // Movie.m @implementation Movie @dynamic title; @end Actually there are no generated getter/setter during compiler time according to understanding of @dynamic, so it is necessary to implement your own getter/setter. My question is that in this NSManagedObject case, what is the rough implementation of getter/setter in super class NSManagedObject ? Except above case, how many other cases to use @dynamic ? Thanks,

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• width of a frustum at a given distance from the near plane

  - by structolite

  I'm using CML to manage the 3D math in an OpenGL-based interface project I'm making for work. I need to know the width of the viewing frustum at a given distance from the eye point, which is kept as a part of a 4x4 matrix that represents the camera. My goal is to position gui objects along the apparent edge of the viewport, but at some distance into the screen from the near clipping plane. CML has a function to extract the planes of the frustum, giving them back in Ax + By + Cz + D = 0 form. This frustum is perpendicular to the camera, which isn't necessarily aligned with the z axis of the perspective projection. I'd like to extract x and z coordinates so as to pin graphical elements to the sides of the screen at different distances from the camera. What is the best way to go about doing it? Thanks!

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• Using Java Reflections to retrieve member classes

  - by darkie15

  Hi All, I am using .getDeclaredClasses() method to retrieve all the classes that have been defined in object. However, I am not able to retrieve anonymous classes defined in the class. Here is the code sample that I am testing: public class TempCodes { public static void main(String[] args) { Ball b = new Ball() { public void hit() { System.out.println("You hit it!"); } }; b.hit(); } interface Ball { void hit(); } } and this is what my code does: memClass = className.getDeclaredClasses(); if (memClass .length > 0) { for (int index = 0 ; index < memClass .length ; index++) { System.out.println("\t\t\t" + memClass [index]); } } Can anyone help me understand how to retrieve the anonymous class? Regards, darkie

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• Building a Com addin for Office 2000 / Office 2007

  - by Stuart

  I am struggling to find a straight forward guide to creating office addins using VSTO and VB.net. Specifically I would like to know how to be able to create a addin/ dll which can either be referenced from VBA in the form:- Addin.method(argument) or Addin.property = X Or which would install its own custom toolbars/ ribbon interface to an aspect of office for example Word. I've checked MSDN and in terms of legibility and usability of the explanations I have drawn a blank so far. I currently have a requirement to create at least one addin for Office 2000 to run and manipluate SQL and then a suite of addins for a customized Office 2007 (Word) set-up.

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• Login to SQL Server Express via development environment (VS2010)

  - by Sanarothe

  Seems like I'm missing something simple, but my attempts to connect to SQL Server Express have failed. I feel like I need to add privileges for my account but I'm not sure where to do it. Dev Env: VS 2010 (Web) SQL: Sql Server Express 2008 OS: XP Trying to open a connection to database returns: Cannot open database "|DataDirectory|DropData.mdf" requested by the login. The login failed. Login failed for user 'devel.' I created the database using the interface in VS 2010 (Add new item - DB File) but my ASP.Net class only covered design-time access and not access in code, so I'm not familiar with what to do. I created a user (Devel) using SQL Server Management Studio to avoid connecting as SA, but couldn't figure out how to give any SQL-level access rights to this account. Any ideas? Thanks, Cameron

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• XmlDataProvider and XPath bindings don't allow default namespace of XML data?

  - by Andy Dent

  I am struggling to work out how to use default namespaces with XmlDataProvider and XPath bindings. There's an ugly answer using local-name <Binding XPath="*[local-name()='Name']" /> but that is not acceptable to the client who wants this XAML to be highly maintainable. The fallback is to force them to use non-default namespaces in the report XML but that is an undesirable solution. The XML report file looks like the following. It will only work if I remove xmlns="http://www.acme.com/xml/schemas/report so there is no default namespace. <?xml version="1.0" encoding="utf-8"?> <?xml-stylesheet type='text/xsl' href='PreviewReportImages.xsl'?> <Report xsl:schemaLocation="http://www.acme.com/xml/schemas/report BlahReport.xsd" xmlns:xsl="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.acme.com/xml/schemas/report"> <Service>Muncher</Service> <Analysis> <Date>27 Apr 2010</Date> <Time>0:09</Time> <Authoriser>Service Centre Manager</Authoriser> Which I am presenting in a window with XAML: <Window x:Class="AcmeTest.ReportPreview" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="ReportPreview" Height="300" Width="300" > <Window.Resources> <XmlDataProvider x:Key="Data"/> </Window.Resources> <StackPanel Orientation="Vertical" DataContext="{Binding Source={StaticResource Data}, XPath=Report}"> <TextBlock Text="{Binding XPath=Service}"/> </StackPanel> </Window> with code-behind used to load an XmlDocument into the XmlDataProvider (seems the only way to have loading from a file or object varying at runtime). public partial class ReportPreview : Window { private void InitXmlProvider(XmlDocument doc) { XmlDataProvider xd = (XmlDataProvider)Resources["Data"]; xd.Document = doc; } public ReportPreview(XmlDocument doc) { InitializeComponent(); InitXmlProvider(doc); } public ReportPreview(String reportPath) { InitializeComponent(); var doc = new XmlDocument(); doc.Load(reportPath); InitXmlProvider(doc); } }

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• Design Time Attribute For CSS Class in ASP.net Custom Server Control

  - by Jon P

  Hopefully some Custom Control Designers/Builders can help I'm attempting to build my first custom control that is essential a client detail collection form. There are to be a series of elements to this form that require various styles applied to them. Ideally I'd like the VS 2005/2008 properties interface to be able to apply the CSSClass as it does at the control level, i.e. with a dropdown list of available CSS Clases. Take for example the Class to be applied to the legend tag /// <summary>Css Class for Legend</summary> [Category("Appearance")] [Browsable(true)] [DefaultValue("")] //I am at a loss as to what goes in [Editor] [Editor(System.Web.UI.CssStyleCollection), typeof(System.Drawing.Design.UITypeEditor))] public string LegendCSSClass { get { return _LegendCSSClass; } set { _LegendCSSClass = value; } } I have tried a couple of options, as you can see from above, without much luck. Hopefully there is something simple I am missing. I'd also be happy for references pertaining to the [Editor] attribute

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• Inter Widget Communication for iGoogle like portals

  - by bakore

  I was looking for a platform where widgets developed using various technologies like Java can communicate with each other. In other words When I add widgets to an interface I need them to talk to each other. For example A Click event in one widget should trigger an event in some other widget. I have been looking into the web for solutions and ways to do it, but couldnt find anything concrete. Any pointers or information on this would be great. Something like this http://blogs.sun.com/pdblog/entry/inter_widget_communication_in_cross Google also had a gadget to gadget communication API which was deprecated last year.

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• Flash AS3: crop TextField content off at X lines, add '...' at the end

  - by matt lohkamp

  There's only room for three lines of text in the interface, but the content is external and variable, and if it ends up taking up more than three lines, there needs to be some sort of 'view all' button functionality. I can kind of think about what that function needs to look like, but I'm not quite sure what the best way to do it in AS3 would be. Something like (in pseudo code): function cropText(source:TextField, length:int, append:String):TextField{ if(source.lineCount > length){ source.text = // magic function that retuns the first length lines, // minus append.length characters, with the append value tacked onto the end } return source; } ... right? How would you fill in the missing bit?

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