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Articles indexed in March 2010

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  • C# WPF XAML Problem with icon in GridViewColumn

    - by Alex
    I've created a ListView with a GridView component in it. Now trying to fill one of the cells with an icon (PNG) like in the code sample below (save_icon.png): <ListView.View> <GridView> <GridViewColumn Header="Date" Width="Auto" DisplayMemberBinding="{Binding Date}" /> <GridViewColumn Header="Time" Width="Auto" DisplayMemberBinding="{Binding Time}" /> <GridViewColumn Header="FriendlyName" Width="Auto" DisplayMemberBinding="{Binding FriendlyName}" /> <GridViewColumn Width="Auto"> <Image Source="save_icon.png" /> </GridViewColumn> </GridView> </ListView.View> Visual Studio gives me an error on the line, where i put the icon into the column (ERROR: "Error 35: The file save_icon.png is not part of the project or its 'Build Action' property is not set to 'Resource'.") I added the icon to the project as a resource and when i start the app, everything works (the icon appears at the right place). But the WPF designer window can't be reloaded and i'm not able to see changes in the designer, when i change the XAML code. Can somebody explain this error or am i doing something wrong? Thanks for every hint in advance!

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  • Factory Method Pattern using Generics-C#

    - by nanda
    Just I am learning Generics.When i have an Abstract Method pattern like : //Abstract Product interface IPage { string pageType(); } //Concerete Product 1 class ResumePage : IPage { public string pageType() { return "Resume Page"; } } //Concrete Product 2 class SummaryPage : IPage { public string pageType() { return "SummaryPage"; } } //Fcatory Creator class FactoryCreator { public IPage CreateOnRequirement(int i) { if (i == 1) return new ResumePage(); else { return new SummaryPage(); } } } //Client/Consumer void Main() { FactoryCreator c = new FactoryCreator(); IPage p; p = c.CreateOnRequirement(1); Console.WriteLine("Page Type is {0}", p.pageType()); p = c.CreateOnRequirement(2); Console.WriteLine("Page Type is {0}", p.pageType()); Console.ReadLine(); } how to convert the code using generics?

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  • C++: Declaration of template class member specialization

    - by Ziv
    When I specialize a (static) member function/constant in a template class, I'm confused as to where the declaration is meant to go. Here's an example of what I what to do - yoinked directly from IBM's reference on template specialization: ===IBM Member Specialization Example=== template<class T> class X { public: static T v; static void f(T); }; template<class T> T X<T>::v = 0; template<class T> void X<T>::f(T arg) { v = arg; } template<> char* X<char*>::v = "Hello"; template<> void X<float>::f(float arg) { v = arg * 2; } int main() { X<char*> a, b; X<float> c; c.f(10); // X<float>::v now set to 20 } The question is, how do I divide this into header/cpp files? The generic implementation is obviously in the header, but what about the specialization? It can't go in the header file, because it's concrete, leading to multiple definition. But if it goes into the .cpp file, is code which calls X::f() aware of the specialization, or might it rely on the generic X::f()? So far I've got the specialization in the .cpp only, with no declaration in the header. I'm not having trouble compiling or even running my code (on gcc, don't remember the version at the moment), and it behaves as expected - recognizing the specialization. But A) I'm not sure this is correct, and I'd like to know what is, and B) my Doxygen documentation comes out wonky and very misleading (more on that in a moment a later question). What seems most natural to me would be something like this, declaring the specialization in the header and defining it in the .cpp: ===XClass.hpp=== #ifndef XCLASS_HPP #define XCLASS_HPP template<class T> class X { public: static T v; static void f(T); }; template<class T> T X<T>::v = 0; template<class T> void X<T>::f(T arg) { v = arg; } /* declaration of specialized functions */ template<> char* X<char*>::v; template<> void X<float>::f(float arg); #endif ===XClass.cpp=== #include <XClass.hpp> /* concrete implementation of specialized functions */ template<> char* X<char*>::v = "Hello"; template<> void X<float>::f(float arg) { v = arg * 2; } ...but I have no idea if this is correct. Any ideas? Thanks much, Ziv

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  • How to define 2-bit numbers in C, if possible?

    - by Eddy
    For my university process I'm simulating a process called random sequential adsorption. One of the things I have to do involves randomly depositing squares (which cannot overlap) onto a lattice until there is no more room left, repeating the process several times in order to find the average 'jamming' coverage %. Basically I'm performing operations on a large array of integers, of which 3 possible values exist: 0, 1 and 2. The sites marked with '0' are empty, the sites marked with '1' are full. Initially the array is defined like this: int i, j; int n = 1000000000; int array[n][n]; for(j = 0; j < n; j++) { for(i = 0; i < n; i++) { array[i][j] = 0; } } Say I want to deposit 5*5 squares randomly on the array (that cannot overlap), so that the squares are represented by '1's. This would be done by choosing the x and y coordinates randomly and then creating a 5*5 square of '1's with the topleft point of the square starting at that point. I would then mark sites near the square as '2's. These represent the sites that are unavailable since depositing a square at those sites would cause it to overlap an existing square. This process would continue until there is no more room left to deposit squares on the array (basically, no more '0's left on the array) Anyway, to the point. I would like to make this process as efficient as possible, by using bitwise operations. This would be easy if I didn't have to mark sites near the squares. I was wondering whether creating a 2-bit number would be possible, so that I can account for the sites marked with '2'. Sorry if this sounds really complicated, I just wanted to explain why I want to do this.

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  • ASP.NET 4.0 meta tags and Search engine optimisation

    - by nikolaosk
    I am thinking to create a new series of posts regarding ASP.NET and SEO (Search Engine Optimisation). I am going to start with this post , talking about some new features that make our asp.net apps more SEO friendly. At the end of the day, there is no point having a great application and somehow "scare" the search engines away. This is going to be a short post so let's quickly have a look at meta keywords and ASP.NET 4.0. Meta keywords and description are important elements of a page and make it...(read more)

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  • Silverlight Introduction

    This article will be very helpful for beginners who want to know and start development on Silverlight projects. In this article I begin with the definition of Silverlight, then move on to define its purpose. You will also see the development tools required to work with Silverlight. At the end of this article you will have been given a complete introduction.

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  • Intellisense Crashing fix for VS 2010

    In this article, Scott discusses the ways to resolve Intellisense Crashing problem in Visual Studio 2010. He examines the symptoms of the crash and then provides the reasons for the crash to occur including a reference about the upcoming patch which is being released by the product team. At the end of the article, he provides the email id of the contact person to whom you should report crashes.

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  • OpenSSL x509 Purpose flag "Any Purpose" What is this?

    - by Nick
    Looking at the details of a certificate using the following: openssl x509 -noout -text -purpose -in mycert.pem I find a bunch of purpose flags (which I've discovered are set by the various extensions attached to a certificate). One of these purpose flags is "Any Purpose". I can't seem to find ANY documentation on this flag and why or why not it is set. Do any of you know where I can find more information on this purpose and what it means? Thanks,

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  • Drop Down List Basics in ASP.NET 3.5

    A drop down list is one of the most important kinds of web form inputs. It lets users select among customized choices. Drop down lists are found in almost all web forms on the Internet and commonly used in application forms and online surveys. If you want to learn more about their use with ASP.NET 3.5 keep reading.... Download a Free Trial of Windows 7 Reduce Management Costs and Improve Productivity with Windows 7

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  • What's the purpose of having a separate "operator new[]" ?

    - by sharptooth
    Looks like operator new and operator new[] have exactly the same signature: void* operator new( size_t size ); void* operator new[]( size_t size ); and do exactly the same: either return a pointer to a big enough block of raw (not initialized in any way) memory or throw an exception. Also operator new is called internally when I create an object with new and operator new[] - when I create an array of objects with new[]. Still the above two special functions are called by C++ internally in exactly the same manner and I don't se how the two calls can have different meanings. What's the purpose of having two different functions with exactly the same signatures and exactly the same behavior?

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  • Looking for web hosting with php cUrl and MySql support

    - by embedded
    i'm developing an iPhone app which communicates with a remote DB. for that purpose I'm looking for a web hosting service which inclues the following specs: latest PHP cUrl SSL support mySql cron live support Max uptime great money per value ratio The main functionality is communication with the DB and displaying some info on the app. It is important that the web hosting provider will be highly reliable. Are there any providers who give some free usage before starting to pay? Thanks

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  • C# Reading a file and writing out replacing string

    - by Mike
    What I have is a C# windows app that reads a bunch of SQL tables and creates a bunch of queries based on the results. What I'm having a small issue with is the final "," on my query This is what I have ColumnX, from I need to read the entire file, write out exactly what is in the file and just replace the last , before the from with nothing. I tried .replace(@",\n\nfrom),(@"\n\nfrom) but it's not finding it. Any help is appreciated. Example: ColumnX, from Result: ColumnX from

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  • $this->headLink() includes duplicated script

    - by terrani
    Hi, Just like I did before, I used the following code for my new project. <?=$this->headLink()->appendStylesheet('/Layouts/admin/css/button.css');?> <?=$this->headLink()->appendStylesheet('/Layouts/admin/css/inputText.css');?> <?=$this->headLink()->appendStylesheet('/Layouts/admin/css/fancyTable.class.css');?> when I open the website and view source, there are duplicated css link tags. <link href="/Layouts/admin/css/button.css" media="screen" rel="stylesheet" type="text/css" ><link href="/Layouts/admin/css/button.css" media="screen" rel="stylesheet" type="text/css" > <link href="/Layouts/admin/css/inputText.css" media="screen" rel="stylesheet" type="text/css" ><link href="/Layouts/admin/css/button.css" media="screen" rel="stylesheet" type="text/css" > <link href="/Layouts/admin/css/inputText.css" media="screen" rel="stylesheet" type="text/css" > <link href="/Layouts/admin/css/fancyTable.class.css" media="screen" rel="stylesheet" type="text/css" > <link href="/Layouts/admin/css/button.css" media="screen" rel="stylesheet" type="text/css" > <link href="/Layouts/admin/css/inputText.css" media="screen" rel="stylesheet" type="text/css" > <link href="/Layouts/admin/css/fancyTable.class.css" media="screen" rel="stylesheet" type="text/css" > <link href="/Layouts/admin/css/divine.css" media="screen" rel="stylesheet" type="text/css" > What is going on with my code??

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  • Apache BeanUtils.copyProperties is spilling too much log

    - by Ravi Gupta
    How can I switch off logging for BeanUtils.copyProperties ? It creates way too much logs and hampers the log file readability. Thanks heaps.. Sample code BeanUtils.copyProperties(someDataobject,someActionForm); In the log I see hunders of lines like below EBUG org.apache.commons.beanutils.PropertyUtils - setSimpleProperty: Invoking method public void someMethod(java.lang.String) with value null (class ) 2010-03-23 18:53:23,134 DEBUG org.apache.commons.beanutils.BeanUtils - copyProperty(someActionForm@13e38a7, someValue, )

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  • Chaining multiple MapReduce jobs in Hadoop.

    - by Niels Basjes
    In many real-life situations where you apply MapReduce, the final algorithms end up being several MapReduce steps. I.e. Map1 , Reduce1 , Map2 , Reduce2 , etc. So you have the output from the last reduce that is needed as the input for the next map. The intermediate data is something you (in general) do not want to keep once the pipeline has been successfully completed. Also because this intermediate data is in general some data structure (like a 'map' or a 'set') you don't want to put too much effort in writing and reading these key-value pairs. What is the recommended way of doing that in Hadoop? Is there a (simple) example that shows how to handle this intermediate data in the correct way, including the cleanup afterward? Thanks.

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  • want to build an alarm app in iphone.

    - by Sumit Kr Singh
    Hi, I want to build an alarm application for iphone. I want to ignore iphone device state and volume buttons state. I want to play sound anyhow in full volume and also want that user cant modify volume using iphone hardware buttons while sound is played. Does anybody know how to implement it? Please post the code here....... Thankx in Advance.......

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  • ASP.NET Model Binder and base type

    - by user137348
    My model inherits from an interface: public interface IGrid { ISearchExpression Search { get; set; } . . } public interface ISearchExpression { IRelationPredicateBucket Get(); } The model: public class Project : IGrid { public ISearchExpression Search { get; set; } public Project() { this.Search = new ProjectSearch(); } } The ProjectSearch: public class ProjectSearch: ISearchExpression { public string Name { get; set; } public string Number { get; set; } public IRelationPredicateBucket Get() {...} } And the strong typed partialview in the main view: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<ProjectSearch>" %> <%= Html.TextBoxFor(x=>x.Name)%> <%= Html.TextBoxFor(x => x.Number)%> .... When I submit the form, the Search property don't get bound properly. Everything is empty.The action takes an argument of ProjectSearch type. Why the Search don't get bound as supposed ?

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  • MySQL: Copy a field to another table

    - by harpax
    I have a table posts that could look like this: id | title | body | created | .. ------------------------------------------- I would like to use the boolean search feature that is offered by a MyISAM Table, but the posts table is InnoDB. So I created another table 'post_contents' that looks like this: post_id | body -------------------- That table is already filled with some contents and I can use the boolean search. However, I need to move the title field in the post_contents table as well and then copy the existing title-data to the new field. I know about the INSERT .. SELECT syntax, but I don't seem to be able to create the correct query.

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