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  • C# yield return not returning an item as expected

    - by Jiho Han
    I have following code: private void ProcessQueue() { foreach (MessageQueueItem item in GetNextQueuedItem()) PerformAction(item); } private IEnumerable<MessageQueueItem> GetNextQueuedItem() { if (_messageQueue.Count > 0) yield return _messageQueue.Dequeue(); } Initially there is one item in the queue as ProcessQueue is called. During PerformAction, I would add more items to _messageQueue. However, the foreach loop quits after the initial item and does not see the subsequent items added. I sense that somehow the initial state of the queue is being captured by yield. Can someone explain what is happening and give a solution?

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  • Modify an object without using it as parameter

    - by Claire Huang
    I have a global object "X" and a class "A". I need a function F in A which have the ability to modify the content of X. For some reason, X cannot be a data member of A (but A can contain some member Y as reference of X), and also, F cannot have any parameter, so I cannot pass X as an parameter into F. (Here A is an dialog and F is a slot without any parameter, such as accept() ) How can I modify X within F if I cannot pass X into it? Is there any way to let A know that "X" is the object it need to modify?? I try to add something such as SetItem to specify X in A, but failed.

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  • Starting point for learning CAD/CAE file formats?

    - by Escader
    We are developing some stress and strain analysis software at university. Now it's time to move from rectangles and boxes and spheres to some real models. But I still have little idea where to start. In our software we are going to build mesh and then make calculations, but how do I import solid bodies from CAD/CAE software? 1) How CAD/CAE models are organised? How solid bodies are represented? What are the possibilities of DWG, DXF, IGES, STEP formats? There is e.g. a complete DXF reference, but it's too difficult for me to understand without knowing basic concepts. 2) Are there C++ libraries to import solid bodies from CAD/CAE file formats? Won't it be too difficult to build a complete model to be able to import comprehensive file?

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  • Using Graphics2D to overlay text on a BufferedImage and return a BufferedImage

    - by Andrew Bolster
    I have checked similarly named questions, but they don't answer this use case. Basically, I was to overlay some text (text) at a given coordinate (x,y) I have the below function in a package; protected BufferedImage Process2(BufferedImage image){ Graphics2D gO = image.createGraphics(); gO.setColor(Color.red); gO.setFont(new Font( "SansSerif", Font.BOLD, 12 )); gO.drawString(this.text, this.x, this.y); System.err.println(this.text+this.x+this.y); return image; } I feel like im missing something patently obvious; every reference to Graphics2D I can find is dealing with either games or writing directly to a file but I just want a BufferedImage returned. with the overlay 'rendered' In the current code, the image appears out the end unchanged. Thanks!

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  • ASP.NET 3.5 Routing?

    - by Maushu
    I was looking for a way to route http://www.example.com/WebService.asmx to http://www.example.com/service/ using only the ASP.NET 3.5 Routing framework without needing to configure the IIS server. Until now I have done what most tutorials told me, added a reference to the routing assembly, configured stuff in the web.config, added this to the Global.asax: protected void Application_Start(object sender, EventArgs e) { RouteCollection routes = RouteTable.Routes; routes.Add( "WebService", new Route("service/{*Action}", new WebServiceRouteHandler()) ); } ...created this class: public class WebServiceRouteHandler : IRouteHandler { public IHttpHandler GetHttpHandler(RequestContext requestContext) { // What now? } } ...and the problem is right there, I don't know what to do. The tutorials and guides I've read use routing for pages, not webservices. Is this even possible? Ps: The route handler is working, I can visit /service/ and it throws the NotImplementedException I left in the GetHttpHandler method.

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  • Is it a good object-oriented-design practice to send a pointer to private data to another class?

    - by Denis
    Hello everyone, There is well known recommendation not to include into class interface method that returns a pointer (or a reference) to private data of the class. But what do you think about public method of a class that sends to another class a pointer to the private data of the first one. For example: class A { public: void fA(void) {_b.fB(&_var)}; private: B _b; int _var; }; I think that it is some sort of data hiding damage: the private data define state of their own class, so why should one class delegate changes of its own state to another one? What do you think? Denis

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  • Alternative Input Device(Midi) doesn't prevent Screen Saver in Winforms application

    - by DTig
    I have developed a c# winforms application whereby the user is providing input via a midi connected device. The user will go for long periods without using the keyboard or mouse. When I receive a midi message is there anything I can do to "tell" the system that this counts as user activity (ie key press). I don't want the screen saver or time lockouts to occur, if they are actively using the midi device. I think my request is different than other requests I've seen because they want to disable screen savers for the life of their application whereby I just want midi input I receive to count as user interactivity. Is there something I can call when I receive midi input to signify to the system user activity?

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  • CompliationLock throws HttpException when registering areas for ASP.NET MVC unit tests

    - by patridge
    The moment I added a unit test to my ASP.NET MVC application to test some of the area routing, I got an HttpException coming out of the System.Web.Complication.CompilationLock type initializer with the following stack trace. System.Web.HttpException : The type initializer for 'System.Web.Compilation.CompilationLock' threw an exception. ----> System.TypeInitializationException : The type initializer for 'System.Web.Compilation.CompilationLock' threw an exception. ----> System.NullReferenceException : Object reference not set to an instance of an object. at System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() at System.Web.Compilation.BuildManager.GetReferencedAssemblies() at System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.GetReferencedAssemblies() at System.Web.Mvc.TypeCacheUtil.FilterTypesInAssemblies(IBuildManager buildManager, Predicate`1 predicate) at System.Web.Mvc.TypeCacheUtil.GetFilteredTypesFromAssemblies(String cacheName, Predicate`1 predicate, IBuildManager buildManager) at System.Web.Mvc.AreaRegistration.RegisterAllAreas(RouteCollection routes, IBuildManager buildManager, Object state) at System.Web.Mvc.AreaRegistration.RegisterAllAreas(Object state) at System.Web.Mvc.AreaRegistration.RegisterAllAreas() at StpWeb.MvcApplication.RegisterRoutes(RouteCollection routes) in Global.asax.cs: line 16 at StpWeb.Tests.RoutesTest.TestFixtureSetUp() in RoutesTest.cs: line 11 --TypeInitializationException at System.Web.Compilation.CompilationLock.GetLock(ref Boolean gotLock) at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() --NullReferenceException at System.Web.Compilation.CompilationLock..cctor()

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  • displaying web pages over web views in collection view using cocoa bindings

    - by Miraaj
    Hi all, I tried sample example given at this link - Collection View Programming Guide It is simple and it worked. Considering it as a reference I tried a simple application which will show a collection view of web views with some web page displayed over each web view. The model class has two properties: NSString *pageName, and NSURL *pageURL. I then followed each and every step written in tutorial above with required modifications but I was caught in the step - How to bind web view to collection view item? In binding tab it shows three possibilities : Editable, Hidden, Tool tip but none of these is working. Can anyone suggest me way to accomplish my requirement? Thanks, Miraaj

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  • Recursive CTE Problem

    - by Chris
    Hi, I am trying to use a recursive CTE in SQL Server to build up a predicate formula from a table containing the underlying tree structure. For example, my table looks like: -------------------------- Id Operator/Val ParentId -------------------------- 1. 'OR' NULL 2. 'AND' 1 3. 'AND' 1 4. '' 2 5. 'a' 4 6. 'alpha' 4 : : : -------------------------- which represents ((a alpha) AND (b beta)) OR ((c gamma) AND (a < delta)). ParentId is a reference to the Id in the same table of the parent node. I want to write a query which will build up this string from the table. Is it possible? Thanks

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  • MSB3422 Failed to retrieve VC project information through the VC project engine object model. MSB342

    - by Scott Langham
    I'm getting the following errors from MSBuild while trying to build a solution: C:\dev\MySln.sln : warning MSB3422: Failed to retrieve VC project information through the VC project engine object model. Unable to determine default tool for the specified file configuration. C:\dev\MySln.sln : warning MSB3425: Could not resolve VC project reference "C:\dev\MyProj.vcproj". Have you got any ideas on what's causing this? I've seen other postings about similar, but different errors such as when the MSB3422 error has a different message and shows "Illegal characters in path.", but I haven't seen any useful information about how to solve the error I'm getting where it says "Unable to determine default tool for the specified file configuration.". Thanks. I found this, but it doesn't really help: http://social.msdn.microsoft.com/Forums/en-US/msbuild/thread/b470f111-9321-4b43-8bd1-7fcf67c2d402

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  • c# gridview row click

    - by Martijn
    When i click on a row in my gridview, i want to go to a other page with the id i get from the database. In my RowCreated event i have the following line: e.Row.Attributes.Add("onClick", ClientScript.GetPostBackClientHyperlink(this.grdSearchResults, "Select$" + e.Row.RowIndex)); To prevent error messages i have this code: protected override void Render(HtmlTextWriter writer) { // .NET will refuse to accept "unknown" postbacks for security reasons. Because of this we have to register all possible callbacks // This must be done in Render, hence the override for (int i = 0; i < grdSearchResults.Rows.Count; i++) { Page.ClientScript.RegisterForEventValidation(new System.Web.UI.PostBackOptions(grdSearchResults, "Select$" + i.ToString())); } // Do the standard rendering stuff base.Render(writer); } My question is, how can i give a row a unique id (from the DB) and when i click the row, another page is opened (like clicking on a href) and that page can read the id. Thnx

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  • will_paginate undefined method error - Ruby on Rails

    - by bgadoci
    I just installed the gem for will_paginate and it says that it was installed successfully. I followed all the instructions listed with the plugin and I am getting an 'undefined method `paginate' for' error. Can't find much in the way of Google search and haven't been able to fix it myself (obviously). Here is the code: PostsController def index @tag_counts = Tag.count(:group => :tag_name, :order => 'updated_at DESC', :limit => 10) @posts = Post.paginate :page => params[:page], :per_page => 50 respond_to do |format| format.html # index.html.erb format.xml { render :xml => @posts } format.json { render :json => @posts } format.atom end end /model/post.rb class Post < ActiveRecord::Base validates_presence_of :body, :title has_many :comments, :dependent => :destroy has_many :tags, :dependent => :destroy cattr_reader :per_page @@per_page = 10 end /posts/views/index.html.erb <%= will_paginate @posts %>

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  • Decoding bitmaps in Android with the right size

    - by hgpc
    I decode bitmaps from the SD card using BitmapFactory.decodeFile. Sometimes the bitmaps are bigger than what the application needs or that the heap allows, so I use BitmapFactory.Options.inSampleSize to request a subsampled (smaller) bitmap. The problem is that the platform does not enforce the exact value of inSampleSize, and I sometimes end up with a bitmap either too small, or still too big for the available memory. From http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inSampleSize: Note: the decoder will try to fulfill this request, but the resulting bitmap may have different dimensions that precisely what has been requested. Also, powers of 2 are often faster/easier for the decoder to honor. How should I decode bitmaps from the SD card to get a bitmap of the exact size I need while consuming as little memory as possible to decode it?

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  • how callback a function on 404 on JSON ajax request with Jquery?

    - by shingara
    I want made an Ajax request with response on JSON. So I made this Ajax request : $.ajax({ url: 'http://my_url', dataType: "json", success: function(data){ alert('success'); }, error: function(data){ alert('error'); }, complete: function(data) { alert('complete') }}) This code works good but when my url send me a HTTP code 404, no callbacks are used, even the complete callback. After research, it's because my dataType is 'json' so 404 return is HTML and the JSON parsing failed. So no callback. Have you a solution to call a callback function when a 404 is raised ? EDIT: complete callback don't call is return is 404. If you want an URL wit 404 you can call : http://twitter.com/status/user_timeline/jksqdlmjmsd.json?count=3&callback=jsonp1269278524295&_=1269278536697 it's with this URL I have my problem.

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  • How to optimize this MySQL query

    - by James Simpson
    This query was working fine when the database was small, but now that there are millions of rows in the database, I am realizing I should have looked at optimizing this earlier. It is looking at over 600,000 rows and is Using where; Using temporary; Using filesort (which leads to an execution time of 5-10 seconds). It is using an index on the field 'battle_type.' SELECT username, SUM( outcome ) AS wins, COUNT( * ) - SUM( outcome ) AS losses FROM tblBattleHistory WHERE battle_type = '0' && outcome < '2' GROUP BY username ORDER BY wins DESC , losses ASC , username ASC LIMIT 0 , 50

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  • Using HTMLAgility Pack to Extract Links

    - by Soham
    Hi Folks, Consider this simplest piece of code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using HtmlAgilityPack; namespace WebScraper { class Program { static void Main(string[] args) { HtmlDocument doc = new HtmlDocument(); doc.LoadHtml("http://www.google.com"); foreach (HtmlNode link in doc.DocumentNode.SelectNodes("//a[@href]")) { } } } } This effectively doesnt do anything at all, and is copied/inspired from various other StackOverflow questions like this. When compiling this, there is a runtime error which says "Object reference not set to an instance of an object." highlighting the foreach line. I can't understand, why the environment has become irritable to this humble,innocent and useless piece of code. I would also like to know, does HTMLAgilityPack accept HTML classes as nodes?

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  • Facebook Fanpage Wallposting from C# App

    - by brinthhillerup
    Hello Guys I have the following challenge at hand: I have a fanpage for a apartment renting company. They would like to autoupdate their fanpage everytime a new apartment is added to the system. The system is developed in C# ASP.NET 3.5. I have downloaded the Facebook C# API From codeplex. Have anyone done this, or know how to do it? UPDATE: So far I have tried the following: FacebookSession session = new Facebook.Session.ConnectSession(myKey,mySecretKey); Stream stream = new Stream(session); stream.Publish("Testing", null, null, null, 107010519323711); I get a null reference Exception when I call Stream.Publish

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  • "Go To Definition" in Visual Studio only brings up the Metadata

    - by pfunk
    I am working in a Web Project in Visual Studio 2008. When I hit F12 (or right-click and select Go To Definition) Visual Studio is consistently going to the Meta data file instead of going to the source. Some Points: All the source code is C#, there is no VB.Net All the projects are in the same solution Yes, everything is a project reference (checked and double-checked) I have tried the Clean/Rebuild Solution approach (even to the point of clearing out the Temp directory, Temporary ASP.NET Files directory, etc). Has anyone else seen this behavior and/or know how to fix it?

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  • Refernce platform specific System.Data.SQLite

    - by Dmitriy Nagirnyak
    Hi, I am using SQLite for the unit testing and might use it as a database for local development/staging. The System.Data.SQLite has basically 2 versions: x86 and x64. Correct one should be used for the specific platform. I have 64 bit Win7, other guys in the team might use 32-bit OSs. The server's platform is not known at this stage. If I use 32-bit version of the assembly on 64-bit platform I get BadImageFormatException: Could not load file or assembly 'System.Data.SQLite'. I believe similar will happen trying to use 64-bit assembly on 32-bit platform. So my question is what is the best way to reference the SQLite assembly so that it does not depend on the platform and people can just use it? It is ok to use 32-bit version of assembly on a 64-bit platform (Maybe there is a switch for that somewhere?). Thanks, Dmitriy.

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  • error during build using sandcastle help builder with visual studio 2010 .NET 4.0 project

    - by ZeroAbsolute
    I was using sandcastle to generate help for my project in visual studio 2008. When i change my project to visual studio 2010 and change the project .NET version to .NET 4.0 i got this problem with Sandcastel. I can't understand why sandcastel is using C:\Windows\Microsoft.NET\Framework64\v3.5\MSBuild.exe and not C:\Windows\Microsoft.NET\Framework64\v4.0\MSBuild.exe thinking that i specified as framework version the v4.0.30319 Can anyone tell me how to resolve this issue?? Where to change the path of the msbuild.exe or some other solution ??? Generating reflection information... [C:\Windows\Microsoft.NET\Framework64\v3.5\MSBuild.exe] GenerateRefInfo: MrefBuilder (v2.4.10520.1) Copyright c Microsoft 2006 Info: Loaded 1 assemblies for reflection and 0 dependency assemblies. MREFBUILDER : error : Unresolved assembly reference: System.Windows.Forms (System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089) required by WLAEDInt Last step completed in 00:00:01.2731 ------------------------------- SHFB: Error BE0043: Unexpected error detected in last build step. See output above for details.

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  • Session state in asp.net mvc

    - by tiff
    I would like to know how to use session state in a simple log in log out in asp.net mvc.. I have a code here in my controller that I've retrieved from my mysql database for my session log in..but I don't really know how to manipulate it.. <AcceptVerbs(HttpVerbs.Post)> _ Function Index(ByVal username As String, ByVal password As String, ByVal department As String) As ActionResult Dim user As DataTable user = Account.userSelect(username:=username, password:=password, department:=department) If user.Rows.Count = 0 Then Return RedirectToAction("Index", "Home") Else Session("username") = user.Rows(0).Item("username") Session("department") = user.Rows(0).Item("department") Return RedirectToAction("News", "Administration") End If End Function Thank you!

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  • jquery validate plugin: add a custom method

    - by pixeline
    I need some guidance on how to add a validation method to the jquery validate plugin. I've gathered that i need to use the plugin's addMethod() function, but how exactly to have it do what i need... Here i am! My form 's first question is a radio input choice. Each radio input, if selected, shows a sub-question of several checkboxes. What i would like my validation to do is: - make sure one radio input is selected - make sure at least one checkbox pertaining to the radio input is selected. Basically, out of the validate plugin's own logic, i would count the selector's length, and if there isn't any, return the error message. Something like this: var weekSelected = ($('input.seasonSelector:checked input.weekSelector:checked',form).length > 0); if(!weekSelected){ return 'Please select a week inside that season'; } How to turn that into a validate plugin method ?

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  • How do I modify my WCF service to work with ASP.NET pages?

    - by Scott
    I created a WCF service (.NET 3.5) that grabs data from a db and returns a list of objects. It works just fine. I tested it using the WCFTestClient application and got the desired results. Now, I tried to create an ASP.NET web application and consume the service. After enabling <serviceDebug includeExceptionDetailInFaults="true"/> in the config file, the error message is "Object reference not set to an instance of an object." How do I modify the service to work with ASP.NET? Thanks!

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  • How to use jQuery .each() - I get a value, but it's the wrong one

    - by Ankur
    I am returning a JSON object (as a String) through a servlet. The JSON object looks like this: {"3":"Martin Luther","30":"Boris Becker","32":"Joseph Goebels","19":"Leonardo Da Vinci","31":"Adolf Hitler"} My jQuery looks like this (the submission of data is correct because I get a proper looking result from the servlet): $.ajax( { type : "GET", url : "MyServlet", data : queryString + "count=" + variables, success : function(resultObj) { $.each(resultObj, function(key, value) { $("#resultCount").html(key+", "+value); }); } }); However when I try to print the results, that is the variables key and value, I get a number for the key but not a number from the JSONObject and an empty string instead of the value. Essentially the question is about how to "extract" the information from a JSON object.

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