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• Tinyxml Multi Task

  - by shaimagz

  I have a single xml file and every new thread of the program (BHO) is using the same Tinyxml file. every time a new window is open in the program, it runs this code: const char * xmlFileName = "C:\\browsarityXml.xml"; TiXmlDocument doc(xmlFileName); doc.LoadFile(); //some new lines in the xml.. and than save: doc.SaveFile(xmlFileName); The problem is that after the first window is adding new data to the xml and saves it, the next window can't add to it. although the next one can read the data in the xml, it can't write to it. I thought about two possibilities to make it work, but I don't know how to implement them: Destroy the doc object when I'm done with it. Some function in Tinyxml library to unload the file. Any help or better understanding of the problem will be great. Thanks.

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• adding one time options to items

  - by rap-uvic

  Hello, I'm building an Event Registration site. For any given event, we'll have a handful of items to choose from. I have a table for these items. For each event we might have special options for users. For example, for one of the events new users get to buy an item which is not available to other users. This may not apply to all the events. For other events we might have some other restriction on items. I will obviously be checking this programmatically on application side. I would like to though, set up a column containing flag in the items table. But I don't find it feasible because this condition may only apply to one particular event. I don't want all the future items to have this column. What is a good approach to take in such a situation? Should I create a special "restrictions" table and just do a join? How would I handle this on the application side?

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• What open source database platform is most easily transferred from my personal machine into a window

  - by Tom

  I would like eventual interaction with MS Dynamics SL and/or MindTouch Core (running on WMware) for eventual intranet and/or internet display. I guess I am asking for front and back end recommendations for a database I am constructing, but since this is my first major project I would greatly appreciate any help and advice. I would also love an opportunity to learn a new language so the code base could be in any language. I do have a few more related questions for discussion; What is the viability of using Google hosting to provide the service to the public for free? Should I implement plone or another CMS if I have a large amount of output? Is there a structuring questionnaire or standards publication I could reference? Does UML diagramming provide additional options for portability? Thank you.

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• Aren't Information Expert / Tell Don't Ask at odds with Single Responsibility Principle?

  - by moffdub

  It is probably just me, which is why I'm asking the question. Information Expert, Tell Don't Ask, and SRP are often mentioned together as best practices. But I think they are at odds. Here is what I'm talking about: Code that favors SRP but violates Tell Don't Ask, Info Expert: Customer bob = ...; // TransferObjectFactory has to use Customer's accessors to do its work, // violates Tell Don't Ask CustomerDTO dto = TransferObjectFactory.createFrom(bob); Code that favors Tell Don't Ask / Info Expert but violates SRP: Customer bob = ...; // Now Customer is doing more than just representing the domain concept of Customer, // violates SRP CustomerDTO dto = bob.toDTO(); If they are indeed at odds, that's a vindication of my OCD. Otherwise, please fill me in on how these practices can co-exist peacefully. Thank you. Edit: someone wants a definition of the terms - Information Expert: objects that have the data needed for the operation should host the operation Tell Don't Ask: don't ask objects for data in order to do work; tell the objects to do the work Single Responsibility Principle: each object should have a narrowly defined responsibility

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• What's a good 3D modelling editor, other than Blender, that can be used within Unity 3D?

  - by Arc

  Unity 3D is an amazing tool for quickly creating good-looking, fun games. Unfortunately, its not intended to be used for actually designing your characters or complex levels. Blender is the general low-budget answer for this, but is difficult to understand when compared to proprietary programs, say, 3DS Max. What else is out there?

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• How do I keep C# applications pinned during AutoUpdate?

  - by RyanTM

  When an application deployed by ClickOnce AutoUpdate is automatically updated on Windows 7, the application becomes unpinnned from the taskbar. Is there a way to stop it from becoming unpinned?

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• Are Multiple Iterators possible in php?

  - by artvolk

  Good day! I know that C# allows multiple iterators using yield, like described here: http://stackoverflow.com/questions/1754041/is-multiple-iterators-is-possible-in-c In PHP there is and Iterator interface. Is it possible to implement more than one iteration scenario for a class? More details (EDIT): For example I have class TreeNode implementing single tree node. The whole tree can be expressed using only one this class. I want to provide iterators for iterating all direct and indirect children of current node, for example using BreadthFirst or DepthFirst order. I can implement this Iterators as separate classes but doing so I need that tree node should expose it's children collection as public. C# pseudocode: public class TreeNode<T> { ... public IEnumerable<T> DepthFirstEnumerator { get { // Some tree traversal using 'yield return' } } public IEnumerable<T> BreadthFirstEnumerator { get { // Some tree traversal using 'yield return' } } }

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• losing mvc intellisense

  - by freddoo

  Hi My intellisense doesn't work in aspx or ascx pages running mvc 1.0 When I save or build it does not show the intellisense, but if I do a clean then it works it this a bug or am I missing something ? thanks

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• O(log n) algorithm for computing rank of union of two sorted lists?

  - by Eternal Learner

  Given two sorted lists, each containing n real numbers, is there a O(log?n) time algorithm to compute the element of rank i (where i coresponds to index in increasing order) in the union of the two lists, assuming the elements of the two lists are distinct? I can think of using a Merge procedure to merge the 2 lists and then find the A[i] element in constant time. But the Merge would take O(n) time. How do we solve it in O(log n) time?

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• VS2010 Developer Image

  - by David Ward

  I am about to create a new developer PC image for developing WPF applications using VS2010, WCF, SQL2008 and SharePoint2010. What OS should I opt for? Windows 7? Windows Server 2008 R2? I'd have thought Windows 7 to make sure that I have a similar experience during development as an end user, however I can't install SharePoint on a client OS and so thought about Windows Server 2008 R2 to help with the SharePoint development process. Thoughts?

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• Algorithm to represent Decision tables

  - by driveBy

  What would be the best algorithm to use if you wanted to store Decision tables in code, i've looked at the Adjacency matrix and Binary tree would anyone consider this to be the right direction? What other choices to I have?

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• CBlobResult gives pains.... using Visual C++ 2008... opencv

  - by kaushalyjain

  When I type the following code line.. where img_hsv is a Mat image... IplImage abc=img_hsv; // object that will contain blobs of inputImage CBlobResult blobs; // Extract the blobs using a threshold of 100 in the image blobs = CBlobResult(&abc,NULL,100,true); It displays the following error... error C2661: 'CBlobResult::CBlobResult' : no overloaded function takes 4 arguments.. Any help is welcome...!!

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• Circular Dependency Solution

  - by gfoley

  Our current project has ran into a circular dependency issue. Our business logic assembly is using classes and static methods from our SharedLibrary assembly. The SharedLibrary contains a whole bunch of helper functions, such as a SQL Reader class, Enumerators, Global Variables, Error Handling, Logging and Validation. The SharedLibrary needs access to the Business objects, but the Business objects need access to SharedLibrary. The old developers solved this obvious code smell by replicating the functionality of the business objects in the shared library (very anti-DRY). I've spent a day now trying to read about my options to solve this but i'm hitting a dead end. I'm open to the idea of architecture redesign, but only as a last resort. So how can i have a Shared Helper Library which can access the business objects, with the business objects still accessing the Shared Helper Library?

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• DDD and MVC: Difference between 'Model' and 'Entity'

  - by Nathan Loding

  I'm seriously confused about the concept of the 'Model' in MVC. Most frameworks that exist today put the Model between the Controller and the database, and the Model almost acts like a database abstraction layer. The concept of 'Fat Model Skinny Controller' is lost as the Controller starts doing more and more logic. In DDD, there is also the concept of a Domain Entity, which has a unique identity to it. As I understand it, a user is a good example of an Entity (unique userid, for instance). The Entity has a life-cycle -- it's values can change throughout the course of the action -- and then it's saved or discarded. The Entity I describe above is what I thought Model was supposed to be in MVC? How off-base am I? To clutter things more, you throw in other patterns, such as the Repository pattern (maybe putting a Service in there). It's pretty clear how the Repository would interact with an Entity -- how does it with a Model? Controllers can have multiple Models, which makes it seem like a Model is less a "database table" than it is a unique Entity. So, in very rough terms, which is better? No "Model" really ... class MyController { public function index() { $repo = new PostRepository(); $posts = $repo->findAllByDateRange('within 30 days'); foreach($posts as $post) { echo $post->Author; } } } Or this, which has a Model as the DAO? class MyController { public function index() { $model = new PostModel(); // maybe this returns a PostRepository? $posts = $model->findAllByDateRange('within 30 days'); while($posts->getNext()) { echo $posts->Post->Author; } } } Both those examples didn't even do what I was describing above. I'm clearly lost. Any input?

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• Temporary debug releases and final application releases

  - by baron

  I have a quick question regarding debug and release in VS 2008. I have an app i've been working on - its not yet complete but the bulk of the functionality is there. So basically i'm trying to give a copy of it now to the person helping with documentation - just so they can have a play and get the feel for what i've made. Now the question is how to provide it to them. I was told to just copy the .exe out of the debug/bin folder and put that onto USB. But when testing, if I run this .exe anywhere else (outside of this folder) it crashes. I've now worked out why this is: var path = ConfigurationManager.AppSettings["PathToUse"]; var files = Directory.GetFiles(path); throws a null reference, so that App.config file is not being used. If I copy that file in with the .exe it works again. So actually my question is regarding the best way to manage this situation. What is the best way to provide a working copy to people, and, is there a reference on preparing apps for release - so everything is packaged together and installed in a clean structured folder heirarchy?

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• Installing Tangible T4 Editor in VS 2010 RC

  - by Stomp

  I installed the (free) Tangible T4 Editor from the VS Gallery, and shut down/restarted VS. I run on XP under an Administrator account. VS Extension Manager indicates that the editor is installed and enabled. Here is my problem: When I do Add New Item (as in the video here), I don't see any of the Tangible templates. What have I missed? (BTW, I looked around some more, found the T4 Toolbox, installed that, and still see no new templates for Tangible or the toolbox). Thanks!

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• VS2010 .filter files and SVN

  - by Noah Roberts

  Since we've switched to VS2010 we've noticed a new .filters file that apparently contains the filter structure of the project. We're also using subversion as our source control. Unfortunately, every time we check in now we end up with merge conflicts if anyone's added a file or filter to the project. SVN seems absolutely incapable of merging this file type correctly even though it's text based. It's getting rather frustrating. Is anyone else dealing with this problem? Has anyone found a solution?

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• Localize node texts in treeview using resource files

  - by Obalix

  For a project I need a tree view that allows the user to select a module, which then is displayed in a content area. The project relies heavily on localization and this is provided by the resource files. Now I discovered today, that the text that are assigned to preset tree view nodes are not contained in the resource files. So the question is whether there is a way of doing this, short of mapping the elemenst in code. I.e. assigning a name to the node, running over all nodes and pulling the resources from the resouce manager based on the node name. This is what I am currently doing, however, it just doesn't "feel" right: private void TranslateNodes(TreeNodeCollection treeNodeCollection) { var rm = Resources.ResourceManager; foreach (TreeNode node in treeNodeCollection) { node.Text = rm.GetString(node.Name + "_Text"); this.TranslateNodes(node.Nodes); } } Thanks!

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• Calling SetWindowsHookEx inside VS2008 debugger always returns NULL

  - by SoMoS

  we're working on a .Net application that does a low level keyboard hook. When we call the SetWindowsHookEx running inside the debugger the call always fail. When running from the compiled executable everything works fine. If we attach to the processs the the SetWindowsHookEx has been called everything works too. I've read somewhere (I can not remember) that VS already does a low level keyboard hook but this shouldn't be a problem as there is the CallNextHook function. Someone knows what's happening? EDIT: The code is pretty straigfoward, the exception is thrown inside debugger but not outside. Public Sub New() m_callback = New NativeMethods.KeyboardHookDelegate(AddressOf KeyboardCallback) End Sub Public Sub Start() m_handle = NativeMethods.SetWindowsHookEx(NativeMethods.HookType.WH_KEYBOARD_LL, m_callback, Marshal.GetHINSTANCE(Reflection.Assembly.GetExecutingAssembly().GetModules()(0)).ToInt32, 0) If m_handle = 0 Then Throw New Exception() End If End Sub

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• Support for VB.NET's Imported Namespaces feature in C#

  - by Fred F.

  I am use to VB.NET. The game source code I am learning from is written in C#. I find it annoying that I have to add using System.Diagnostics to the source code in order to type Debug.WriteLine.... I checked under project properties, but I cannot find the References tab that allows me to add namespaces to Imported Namespaces. Where do I find this in C#? Also, why can't I do this in C#? Imports x = System.Math

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• writing a data to App_Data

  - by Alexander

  I want to write an .xml file using the following code into the App_Data/posts, why is it causing an error: Stream writer = new FileStream("..'\'App_Data'\'posts'\'" + new Guid(post_ID.ToString()).ToString() + ".xml", FileMode.Create);

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• Need help choosing database server

  - by The Pretender

  Good day everyone. Recently I was given a task to develop an application to automate some aspects of stocks trading. While working on initial architecture, the database dilemma emerged. What I need is a fast database engine which can process huge amounts of data coming in very fast. I'm fairly experienced in general programming, but I never faced a task of developing a high-load database architecture. I developed a simple MSSQL database schema with several many-to-many relationships during one of my projects, but that's it. What I'm looking for is some advice on choosing the most suitable database engine and some pointers to various manuals or books which describe high-load database development. Specifics of the project are as follows: OS: Windows NT family (Server 2008 / 7) Primary platform: .NET with C# Database structure: one table to hold primary items and two or three tables with foreign keys to the first table to hold additional information. Database SELECT requirements: Need super-fast selection by foreign keys and by combination of foreign key and one of the columns (presumably DATETIME) Database INSERT requirements: The faster the better :) If there'll be significant performance gain, some parts can be written in C++ with managed interfaces to the rest of the system. So once again: given all that stuff I just typed, please give me some advice on what the best database for my project is. Links or references to some manuals and books on the subject are also greatly appreciated. EDIT: I'll need to insert 3-5 rows in 2 tables approximately once in 30-50 milliseconds and I'll need to do SELECT with 0-2 WHERE clauses queries with similar rate.

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• I cannot grok MVC, what it is, and what it is not?

  - by Hao

  I cannot grok what MVC is, what mindset or programming model should I acquire so MVC stuff can instantly "lightbulb" on my head? If not instantly, what simple programs/projects should I try to do first so I can apply the neat things MVC brings to programming. OOP is intuitive and easier, object is all around us, and the benefits of code reuse using OOP-paradigm instantly click to anyone. You can probably talk to anybody about OOP in a few minutes and lecture some examples and they would get it. While OOP somehow raise the intuitiveness aspect of programming, MVC seems to do the opposite. I'm getting negative thoughts that some future employers(or even clients) would look down upon me for not using MVC technology. Though I probably get the skinnable aspect of MVC, but when I try to apply it to my own project, I don't know where to start. And also some programmers even have diverging views on how to accomplish MVC properly. Take this for instance from Jeff's post about MVC: The view is simply how you lay the data out, how it is displayed. If you want a subset of some data, for example, my opinion is that is a responsibility of the model. So maybe some programmers use MVC, but they somehow inadvertently use the View or the Controller to extract a subset of data. Why we can't have a definitive definition of what and how to accomplish MVC properly? And also, when I search for MVC .NET programs, most of it applies to web programs, not desktop apps, this intrigue me further. My guess is, this is most advantageous to web apps, there's not much problem about intermixed view(html) and controller(program code) in desktop apps.

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• Working with foreigh keys - cannot insert

  - by Industrial

  Hi everyone! Doing my first tryouts with foreign keys in a mySQL database and are trying to do a insert, that fails for this reason: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails Does this mean that foreign keys restrict INSERTS as well as DELETES and/or UPDATES on each table that is enforced with foreign keys relations? Thanks!

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• A Program that sits in the Notification Area

  - by Jimbob

  Hello, Thanks for taking the time to read my question. If I build a program, how can I get it to hide in the notifications area(windows 7, cant remember what it's called in XP or Vista) when I minimize it? Like say a Torrent program, or a AntiVirus program. Also I'd like to know, how can I hide it from the notifications area and bring it up when it a hotkey command is entered? Any clues on any of these two problems I'm having for an a program I am doing would be great. Thankyou

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