martin luo - Page 24 - Developer IT

jquery click event handler is called twice for a checkbox

- by Martin

I have a problem with the following code in an ASPX page: <script type="text/javascript"> $(document).ready(function() { $('.test').click(function() { alert("click") }) }); </script> <asp:CheckBox runat="server" Text="Checkbox XYZ" CssClass="test" ID="cb1" /> In the browser (FF3.5 / IE8) I have the following problem: if I click the checkbox (the small square), it works as expected if I click the checkbox's text ("Checkbox XYZ"), then the click event is fired twice, and the alert is shown twice I guess this has to do with the way the checkbox is rendered to HTML, which is like this: <span class="test"> <input id="ctl00_c1_cb1" type="checkbox" name="ctl00$c1$cb1" checked="checked" /> <label for="ctl00_c1_cb1">Checkbox XYZ</label> </span> How do I correctly setup the click event handler to prevent it from being called twice?

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What are the reasons why the CPU usage doesn’t go 100% with C# and APM?

- by Martin

I have an application which is CPU intensive. When the data is processed on a single thread, the CPU usage goes to 100% for many minutes. So the performance of the application appears to be bound by the CPU. I have multithreaded the logic of the application, which result in an increase of the overall performance. However, the CPU usage hardly goes above 30%-50%. I would expect the CPU (and the many cores) to go to 100% since I process many set of data at the same time. Below is a simplified example of the logic I use to start the threads. When I run this example, the CPU goes to 100% (on an 8/16 cores machine). However, my application which uses the same pattern doesn’t. public class DataExecutionContext { public int Counter { get; set; } // Arrays of data } static void Main(string[] args) { // Load data from the database into the context var contexts = new List<DataExecutionContext>(100); for (int i = 0; i < 100; i++) { contexts.Add(new DataExecutionContext()); } // Data loaded. Start to process. var latch = new CountdownEvent(contexts.Count); var processData = new Action<DataExecutionContext>(c => { // The thread doesn't access data from a DB, file, // network, etc. It reads and write data in RAM only // (in its context). for (int i = 0; i < 100000000; i++) c.Counter++; }); foreach (var context in contexts) { processData.BeginInvoke(context, new AsyncCallback(ar => { latch.Signal(); }), null); } latch.Wait(); } I have reduced the number of locks to the strict minimum (only the latch is locking). The best way I found was to create a context in which a thread can read/write in memory. Contexts are not shared among other threads. The threads can’t access the database, files or network. In other words, I profiled my application and I didn’t find any bottleneck. Why the CPU usage of my application doesn’t go about 50%? Is it the pattern I use? Should I create my own thread instead of using the .Net thread pool? Is there any gotchas? Is there any tool that you could recommend me to find my issue? Thanks!

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Alternatives to using WebClient.BaseAddress to get base url in Silverlight

- by Martin Liversage

In a Silverlight application I sometimes need to connect to the web site where the application is hosted. To avoid hard coding the web site in my Silverlight application I use code like this: WebClient webClient = new WebClient(); Uri baseUri = new Uri(webClient.BaseAddress); UriBuilder uriBuilder = new UriBuilder(baseUri.Scheme, baseUri.Host, baseUri.Port); // Continue building the URL ... It feels very clunky to create a WebClient instance just to get access to the URL of the XAP file. Are there any alternatives?

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The Programmer's Bill of Rights

- by Martin

I know Jeff has written about this subject on his coding horror blog in the past but I am interested in learning the opinions of a broad set of developers. I agree wholeheartedly with his statement: I propose we adopt a Programmer's Bill of Rights, protecting the rights of programmers by preventing companies from denying them the fundamentals they need to be successful. So, if you could propose one item to the bill of rights, what would it be?

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DataAnnotations vs IDataErrorInfo

- by Martin

DataAnnotations vs IDataErrorInfo Pros and Cons of both? Benefits of one over the other? (especially related to MVC)

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ClickOnce: The required version of the .NET Framework is not installed on this computer

- by Martin

I have been getting the error "The required version of the .NET Framework is not installed on this computer." (Event Id 4096 in Event log) when trying to install a VSTO application from both a ClickOnce deployment and a local copy. This is interesting as the .NET framework is installed (on my 32bit Windows 7 PC) and the VSTO application was developed on the self same machine (and works in Visual Studio 2008). Does anybody has an idea why I could get this exception? Name: From: http://localhost/BlaBla.vsto "The required version of the .NET Framework is not installed on this computer." ********** Exception Text ********** Microsoft.VisualStudio.Tools.Applications.Deployment.InstallAddInFailedException: "The required version of the .NET Framework is not installed on this computer." at Microsoft.VisualStudio.Tools.Applications.Deployment.ClickOnceAddInDeploymentManager.InstallAddIn() at Microsoft.VisualStudio.Tools.Office.Runtime.SolutionInstaller.<c__DisplayClass7.b__0()

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Problem showing modelstate errors while using RenderPartialToString

- by Martin

Im using the following code: public string RenderPartialToString(ControllerContext context, string partialViewName, ViewDataDictionary viewData, TempDataDictionary tempData) { ViewEngineResult result = ViewEngines.Engines.FindPartialView(context, partialViewName); if (result.View != null) { StringBuilder sb = new StringBuilder(); using (StringWriter sw = new StringWriter(sb)) { using (HtmlTextWriter output = new HtmlTextWriter(sw)) { ViewContext viewContext = new ViewContext(context, result.View, viewData, tempData, output); result.View.Render(viewContext, output); } } return sb.ToString(); } return String.Empty; } To return a partial view and a form through JSON. It works as it should, but as soon as I get modelstate errors my ValidationSummary does not show. The JSON only return the default form but it does not highlight the validation errors or show the validation summary. Am I missing something? This is how I call the RenderPartialToString: string partialView = RenderPartialToString(this.ControllerContext, "~/Areas/User/Views/Account/ChangeAccountDetails.ascx", new ViewDataDictionary(avd), new TempDataDictionary());

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How would i down-sample a .wav file then reconstruct it using nyquist? - in matlab [closed]

- by martin

Possible Duplicate: How would i down-sample a .wav file then reconstruct it using nyquist? - in matlab This is all done in MatLab 2010 My objective is to show the results of: undersampling, nyquist rate/ oversampling First i need to downsample the .wav file to get an incomplete/ or impartial data stream that i can then reconstuct. Heres the flow chart of what im going to be doing So the flow is analog signal - sampling analog filter - ADC - resample down - resample up - DAC - reconstruction analog filter what needs to be achieved: F= Frequency F(Hz=1/s) E.x. 100Hz = 1000 (Cyc/sec) F(s)= 1/(2f) Example problem: 1000 hz = Highest frequency 1/2(1000hz) = 1/2000 = 5x10(-3) sec/cyc or a sampling rate of 5ms This is my first signal processing project using matlab. what i have so far. % Fs = frequency sampled (44100hz or the sampling frequency of a cd) [test,fs]=wavread('test.wav'); % loads the .wav file left=test(:,1); % Plot of the .wav signal time vs. strength time=(1/44100)*length(left); t=linspace(0,time,length(left)); plot(t,left) xlabel('time (sec)'); ylabel('relative signal strength') **%this is were i would need to sample it at the different frequecys (both above and below and at) nyquist frequency.*I think.*** soundsc(left,fs) % shows the resaultant audio file , which is the same as original ( only at or above nyquist frequency however) Can anyone tell me how to make it better, and how to do the various sampling at different frequencies?

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Database Change Management - Setup for Initial Create Scripts, Subsequent Migration Scripts

- by Martin Aatmaa

I've got a database change management workflow in place. It's based on SQL scripts (so, it's not a managed code-based solution). The basic setup looks like this: Initial/ Generate Initial Schema.sql Generate Initial Required Data.sql Generate Initial Test Data.sql Migration 0001_MigrationScriptForChangeOne.sql 0002_MigrationScriptForChangeTwo.sql ... The process to spin up a database is to then run all the Initlal scripts, and then run the sequential Migration scripts. A tool takes case of the versioning requirements, etc. My question is, in this kind of setup, is it useful to also maintain this: Current/ Stored Procedures/ dbo.MyStoredProcedureCreateScript.sql ... Tables/ dbo.MyTableCreateScript.sql ... ... By "this" I mean a directory of scripts (separated by object type) that represents the create scripts for spinning up the current/latest version of the database. For some reason, I really like the idea, but I can't concretely justify it's need. Am I missing something? The advantages would be: For dev and source control, we would have the same object-per-file setup that we're used to For deployment, we can spin up a new DB instance to the latest version either by running the Initial+Migrate, or by running the scripts from Current/ For dev, we do not need a DB instance running in order to do development. We can do "offline" development on the Current/ folder. The disadvantages would be: For each change, we need to update the scripts in the Current/ folder, as well as create a Migration script (in the Migration/ folder) Thanks in advance for any input!

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Looking for library declaration of IP Module

- by Martin

Hi, I want to use the Xilinx hardware module of the ICAP controller in my own design. This module uses the following library: library hwicap_v5_00_a; use hwicap_v5_00_a.all; I was looking in the directories as well as subdirectories of Xilinx\12.1\ISE_DS\EDK\hw\XilinxProcessorIPLib\pcores but I could not find the package declaration of hwicap. Anyone an idea where Xilinx "hides" this information. Many thanks

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codeigniter & cjax framework, fatal error class 'CI_Controller' not found

- by Martin

I'm having this weird error with Codeigniter 2.1.3 and latest cjax for codeigniter. Weird thing is, when I download the latest codeigniter, and latest cjax framework for codeitniger and copy to my friends server, and call: domain.com/ajax.php?test/test2 to show the test ajax examples ... it works like a breeze, but when I do this on my server, I get server error (even tho, we both have same php version and such). Server then throws in error log file this error: PHP Fatal error: Class 'CI_Controller' not found in /hosting/www/domain.com/www/application/response/test.php on line 3 Now, I've read thru stackoverflow with people having this problem and solving by changing the construct and calling CI_Controller instead of Controller. But I already do that ... - I mean it's in the basic example that is suppose to work without touching the code, and it does, just not on my domain for some crappy reason. Ajax.php from cjax framework for codeingter should load controller from folder response, named test and call function test2, which looks like this (the actual file named test.php): class Test extends CI_Controller { function __construct() { parent::__construct(); } /** * * ajax.php?test/test/a/b/c * * @param unknown_type $a * @param unknown_type $b * @param unknown_type $c */ function test($a = null,$b = null, $c = null) { $this->load->view('test', array('data' => $a .' '.$b.' '.$c)); } /** * ajax.php?test/test2 * * Here we are testing out the javascript library. * * Note: the library it is not meant to be included in ajax controllers - but in front-controllers, * it is being used here for the sake of simplicity in testing. */ function test2() { $ajax = ajax(); $ajax->update('response','Cjax Works'); $ajax->append('#response','<br /><br />version: '.$ajax->version); $ajax->success('Cjax was successfully installed.', 5); //see application/views/test2.php $this->load->view('test2'); } I was hoping someone could bring some light into this problem - or maybe someone has already experienced it? Thanks for your time! Mart

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.gitignore for Visual Studio Projects and Solutions

- by Martin Aatmaa

Which files should I include in .gitignore when using Git in conjunction with Visual Studio Solutions (.sln) and Projects? Community Wiki: #OS junk files Thumbs.db *.DS_Store #Visual Studio files *.obj *.exe *.pdb *.user *.aps *.pch *.vspscc *.vssscc *_i.c *_p.c *.ncb *.suo *.tlb *.tlh *.bak *.cache *.ilk *.log *.lib *.sbr *.sdf ipch/ obj/ [Bb]in [Dd]ebug*/ [Rr]elease*/ #Tooling _ReSharper*/ [Tt]est[Rr]esult* #Project files [Bb]uild/

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std::iostream link error vs2010 rc1

- by Martin Beckett

I'm converting a project from vs2008 to vs2010 and getting linker errors for std:ifstream/ofstream error LNK2001: unresolved external symbol "__declspec(dllimport) public: bool __thiscall std::basic_ofstream<char,struct std::char_traits<char> >::is_open(void)const " (__imp_?is_open@?$basic_ofstream@DU?$char_traits@D@std@@@std@@QBE_NXZ) Building static (/MT) or dll (/MD) with unicode or standard and release/debug gives the same error. Manually adding libcpmtd.lib (static) or msvcprtd.lib (dll) to the linker doesn't help. Has anyone else seen this?

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How to pass touch from a UITextView to a UITableViewCell

- by Martin

I have a UITextView in a custom UITableViewCell. The textview works properly (scrolls, shows text, etc.) but I need the users to be able to tap the table cell and go to another screen. Right now, if you tap the edges of the table cell (i.e. outside the UItextView) the next view is properly called. But clearly inside the uitextview the touches are being captured and not forwarded to the table cell. I found a post that talked about subclassing UITextView to forward the touches. I tried that without luck. The implementation is below. I'm wondering if maybe a) the super of my textview isn't the uitableviewcell and thus I need to pass the touch some other way or b) If the super is the uitableviewcell if I need to pass something else? Any help would be much appreciated. #import "ScrollableTextView.h" @implementation ScrollableTextView - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { if (parentScrollView) { [parentScrollView touchesBegan:touches withEvent:event]; } [super touchesBegan:touches withEvent:event]; } - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { if (parentScrollView) { [parentScrollView touchesCancelled:touches withEvent:event]; } [super touchesCancelled:touches withEvent:event]; } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { if (parentScrollView) { [parentScrollView touchesEnded:touches withEvent:event]; } [super touchesEnded:touches withEvent:event]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { if (parentScrollView) { [parentScrollView touchesMoved:touches withEvent:event]; } [super touchesMoved:touches withEvent:event]; } - (BOOL)canBecomeFirstResponder { return YES; } @end

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pointer being freed was not allocated. Complex malloc history help

- by Martin KS

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Inheriting from ViewPage forces explicit casting of model in view

- by Martin Hansen

I try to inhering from ViewPage as shown in this question http://stackoverflow.com/questions/370500/inheriting-from-viewpage But I get a Compiler Error Message: CS1061: 'object' does not contain a definition for 'Spot' and no extension method 'Spot' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?) My viewpage, normally I can do Model.ChildProperty(Spot) when I inherit from ViewPage directly, so I do that here too. But it fails. <%@ Page Language="C#" Inherits="Company.Site.ViewPageBase<WebSite.Models.SpotEntity>" %> <h1><%= Html.Encode(Model.Spot.Title) %></h1> To get it working correctly I have to do like this: <%@ Page Language="C#" Inherits="Company.Site.ViewPageBase<WebSite.Models.SpotEntity>" %> <h1><%= Html.Encode(((WebSite.Models.SpotEntity)Model).Spot.Title) %></h1> Here is my classes: namespace Company.Site { public class ViewPageBase<TModel> : Company.Site.ViewPageBase where TModel:class { private ViewDataDictionary<TModel> _viewData; [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")] public new ViewDataDictionary<TModel> ViewData { get { if (_viewData == null) { SetViewData(new ViewDataDictionary<TModel>()); } return _viewData; } set { SetViewData(value); } } protected override void SetViewData(ViewDataDictionary viewData) { _viewData = new ViewDataDictionary<TModel>(viewData); base.SetViewData(_viewData); } } public class ViewPageBase : System.Web.Mvc.ViewPage { } } So how do I get it to work without the explicit cast?

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Single-threaded apartment - cannot instantiate ActiveX control

- by martin.malek

I need to get information about applied CSS styles in HTML page. I used AxWebBrowser and iterate IHTMLDOMNode. I'm able to get all the data I need and move the code into my application. The problem is that this part is running inside of the background worker and I got exception when trying to instantiate the control. AxWebBrowser browser = new AxWebBrowser(); ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the current thread is not in a single-threaded apartment. Is there any way how to solve this or other option than AxWebBrowser?

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Why 'timeout expired' exception thrown with StructureMap?

- by Martin

I'm getting a "timeout expired" exception thrown from a relatively heavily trafficked ASP.NET MVC 2 site I developed using StructureMap and Fluent NHibernate. I think that perhaps the connections aren't being disposed properly. What do you think may be causing this? Could it be my use of InstanceScope.Hybrid? Here's my NHibernateRegistry class; thanks in advance for your help: using MyProject.Core.Persistence.Impl; using FluentNHibernate.Cfg; using FluentNHibernate.Cfg.Db; using NHibernate; using NHibernate.ByteCode.LinFu; using NHibernate.Cfg; using MyProject.Core.FluentMapping; using StructureMap.Attributes; using StructureMap.Configuration.DSL; namespace MyProject.Core.Persistence { public class NHibernateRegistry : Registry { public NHibernateRegistry() { FluentConfiguration cfg = Fluently.Configure() .Database(MsSqlConfiguration.MsSql2005.ConnectionString( x => x.FromConnectionStringWithKey( "MyConnectionString")) .ProxyFactoryFactory(typeof (ProxyFactoryFactory).AssemblyQualifiedName)) .Mappings(m => m.FluentMappings.AddFromAssemblyOf<EntryMap>()); Configuration configuration = cfg.BuildConfiguration(); ISessionFactory sessionFactory = cfg.BuildSessionFactory(); ForRequestedType<Configuration>().AsSingletons() .TheDefault.IsThis(configuration); ForRequestedType<ISessionFactory>().AsSingletons() .TheDefault.IsThis(sessionFactory); ForRequestedType<ISession>().CacheBy(InstanceScope.Hybrid) .TheDefault.Is.ConstructedBy(ctx => ctx.GetInstance<ISessionFactory>().OpenSession()); ForRequestedType<IUnitOfWork>().CacheBy(InstanceScope.Hybrid) .TheDefaultIsConcreteType<UnitOfWork>(); ForRequestedType<IDatabaseBuilder>().TheDefaultIsConcreteType<DatabaseBuilder>(); } } }

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Good DB Migrations for CakePHP?

- by Martin Westin

Hi, I have been trying a few migration scripts for CakePHP but I ran into problems with all of the in some form or another. Please advice me on a migration option for Cake that you use live and know works. I'd like the following "features": -Support CakePHP 1.2(e.g. CakeDCs migrations will only be an option when 1.3 is stable and my app migrated to the new codebase) -Support for (or at least not halt on) Models with a different database config. -Support Models in sub-folders of app/models -Support Models in plugins -Support tables that do not conform to Cake conventions (I have a few special tables that do not have a single primary key field and need to keep them) -Plays well with automated deployment via Capistrano and Git. I do not need rails-style versioned files a git versioned schema file that is compared live to the existing schema will do. That is: I like the SchemaShell in Cake apart from it not being compatible with most of my requirements above. I have looked at and tested: CakePHP Schema Shell http://book.cakephp.org/view/734/Schema-management-and-migrations CakeDC migrations http://cakedc.com/downloads/view/cakephp_migrations_plugin YAML migrations http://github.com/georgious/cakephp-yaml-migrations-and-fixtures joelmoss migrations http://code.google.com/p/cakephp-migrations

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pdb show different variable values than print statements

- by martin

Hi, everyone. I am debugging a python module with homemade c extensions. The output seems correct when I print it with 'p' in pdb. But if I use a normal print statement or pickle it, the output is wrong. What could be causing pdb to show different values than normal execution? I can even step to the print statement in debug mode, and pdb will show the correct value but the program will print the wrong one. The problem seems to happen only when I have called a certain c extension earlier. Glad to post code if that helps. Thank you.

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iPhone SDK:HTML parsing standard way or example:

- by Clave Martin

Hi, I am accessing a web page using NSURLConnection and have a HTML data downloaded programmatically in my iPhone client application. I want to parse and pick some description data from the HTML tags..It is too dirty tags and my data is also here and there. I would like to ask you, is there a standard or easy way of parsing of HTML data on iPhone development. P.S: I know about XML parsing. thanks. Clave/

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Deploying software on compromised machines

- by Martin

I've been involved in a discussion about how to build internet voting software for a general election. We've reached a general consensus that there exist plenty of secure methods for two way authentication and communication. However, someone came along and pointed out that in a general election some of the machines being used are almost certainly going to be compromised. To quote: Let me be an evil electoral fraudster. I want to sample peoples votes as they vote and hope I get something scandalous. I hire a bot-net from some really shady dudes who control 1000 compromised machines in the UK just for election day. I capture the voting habits of 1000 voters on election day. I notice 5 of them have voted BNP. I look these users up and check out their machines, I look through their documents on their machine and find out their names and addresses. I find out one of them is the wife of a tory MP. I leak 'wife of tory mp is a fascist!' to some blogger I know. It hits the internet and goes viral, swings an election. That's a serious problem! So, what are the best techniques for running software where user interactions with the software must be kept secret, on a machine which is possibly compromised?

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Best json parser for qt?

- by Martin

I'm using QT for Symbian and need a simple json parser. I need to be able to go from json to Qt-variant and the other way around. Is there a simple json parser that I can use? I don't want to write my own. What is the best way to go? Thanks!

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File writing with overlapped IO vs file writing in a separate thread

- by Martin

Is there any advantage in using file writing with overlapped IO in Windows, vs just doing the file writing in a separate thread that I create?

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retreive POST data from FLASH to ASP.Net

- by Martin Ongtangco

here's my AS3 code: var jpgEncoder:JPGEncoder = new JPGEncoder(100); var jpgStream:ByteArray = jpgEncoder.encode(bitmapData); var header:URLRequestHeader = new URLRequestHeader("Content-type", "application/octet-stream"); var jpgURLRequest:URLRequest = new URLRequest("/patients/webcam.aspx"); jpgURLRequest.requestHeaders.push(header); jpgURLRequest.method = URLRequestMethod.POST; jpgURLRequest.data = jpgStream; navigateToURL(jpgURLRequest, "_self"); And here's my ASP.Net Code try { string pt = Path.Combine(PathFolder, "test.jpg"); HttpFileCollection fileCol = Request.Files; Response.Write(fileCol.Count.ToString()); foreach (HttpPostedFile hpf in fileCol) { hpf.SaveAs(pt); } } catch (Exception ex) { Response.Write(ex.Message); } im getting a weird error, HttpFox mentioned: "NS_ERROR_NET_RESET" Any help would be excellent! Thanks!

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