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• C++ Profiling: KiFastSystemCallRet

  - by John

  I searched for this after seeing it's the top rated item when profiling using Very Sleepy, and it seems everyone gets the answer "it's a system function, ignore it". But Sleepy's hint for the function says: Hint: KiFastSystemCallRet often means the thread was waiting for something else to finish. Possible causes might be disk I/O, waiting for an event, or maybe just calling Sleep(). Now, my app is absolutely thrashing the CPU and so it's a bit weird 33% of the time is spent waiting for something to happen. Do I really just ignore it? EDIT: apparently, 77% of the calls to this come from QueryOglResource (?) which is in module nvd3dnum. I think that might be nvidia Direct3D stuff, i.e rendering.

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• Performance implications of Synchronous Sockets vs Asynchronous Sockets

  - by Akash Kava

  We are trying to build an SMTP Server to receive mail notifications from various clients over internet. As each of the communication will be longer and it needs to log everything, doing this Asynchronous way is little challenging as well as by using Socket's Asynchronous methods we are not sure of how flow of control and error handling happens. Previously we wrote lot of server/client apps but we always used Synchronous sockets, reason being they are longer sessions and each session also has lot of local data to manage and parsing messages etc. Does anyone have any experience over real performance differences between these two methods? Async calls use ThreadPool which we have experienced many times to just die for no reason. And we fail to restart threadpool etc. In one way Request-Response protocol of HTTP, Async Sockets makes sense, but SMTP/IMAP etc protocols are longer and they have interleaved messages plus state machine of server. So Async methods are really complicated to program. However if anyone can share the performance of Sockets, it will be helpful.

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• JQuery PrettyPhoto/Lightbox with Loupe Magnifier

  - by thebluefox

  Morning gang, Right, I'm trying to crowbar a magnifier, like this one, into prettyPhoto (picked because the JS is nice). The trouble I'm having is initiating the loupe function when the prettyPhoto has loaded. If I include it in the prettyPhoto JS, it just gets itself into an endless loop, or doesn't get called at all. I've nearly got it working by putting a link next to the close button that calls the function inline, like so; <a href="#" onclick="$(\'.TB_Image\').loupe(); return false;">Magnify</a> The only problem here is that the return false doesn't work? It works when the call to loupe isn't in the onclick event though? Doing it this way does run the loupe function, but the homepage gets loaded so I don't know if it actually works or not. Has anyone got any sugestions at all? All help much appreciated!

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• Remove duplicates from DataTable and custom IEqualityComparer<DataRow>

  - by abatishchev

  How have I to implement IEqualityComparer<DataRow> to remove duplicates rows from a DataTable with next structure: ID primary key, col_1, col_2, col_3, col_4 The default comparer doesn't work because each row has it's own, unique primary key. How to implement IEqualityComparer<DataRow> that will skip primary key and compare only data remained. I have something like this: public class DataRowComparer : IEqualityComparer<DataRow> { public bool Equals(DataRow x, DataRow y) { return x.ItemArray.Except(new object[] { x[x.Table.PrimaryKey[0].ColumnName] }) == y.ItemArray.Except(new object[] { y[y.Table.PrimaryKey[0].ColumnName] }); } public int GetHashCode(DataRow obj) { return obj.ToString().GetHashCode(); } } and public static DataTable RemoveDuplicates(this DataTable table) { return (table.Rows.Count > 0) ? table.AsEnumerable().Distinct(new DataRowComparer()).CopyToDataTable() : table; } but it calls only GetHashCode() and doesn't call Equals()

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• Nested class - calling the nested class from the parent class

  - by insanepaul

  I have a class whereby a method calls a nested class. I want to access the parent class properties from within the nested class. public class ParentClass { private x; private y; private z; something.something = new ChildClass public class ChildClass { need to get x, y and z; } } How do I access x,y and z from within the child class. Something to do with referencing the parent class but how? }

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• mgtwitterengine and oauth 401 error: Boggled

  - by Jason

  OK... so here is my code: twitterEngine = [[MGTwitterEngine alloc] initWithDelegate:self]; [twitterEngine setConsumerKey:CONSUMER_KEY secret:CONSUMER_SECRET]; accessToken = [twitterEngine getXAuthAccessTokenForUsername:profile.twitterUserId password:profile.twitterPassword]; NSLog(@"Access token: %@", accessToken); the console shows the access token returned just fine (so it seems to work) eg. Access token: C8A24515-0F11-4B5A-8813-XXXXXXXXXXXXXX but instead of accessTokenReceived method being called next on my delegate, it calls requestFailed with a 401. How can I be getting a 401 unauthorized and getting an access token back from the method call?????

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• jquery datatables add checkbox with ajax server side response

  - by dotneter

  I am using C# ASP .NET MVC and ajax calls. I am able to get the display of the table along with all features. But, I don't understand how do I add a checkbox and button. I have tried dom-checkbox as well but can't get it to work. Any help is appreciated. My code looks like this: $(document).ready(function () { $('#personTable').dataTable({ "bJQueryUI": true, "sPaginationType": "full_numbers", "bProcessing": true, "bServerSide": true, "sAjaxSource": "/Home/GetCustomData", "aoColumns": [ { "sSortDataType": "dom-checkbox", "sTitle": "Select", sName": "" }, { "sName": "ID", "sTitle": "ID" }, { "sName": "FirstName", "sTitle": "First Name" }, { "sName": "Email", "sTitle": "Email"}] }); }); My Html is : [table border="1" id="personTable" class="display"] [/table]

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• Textbox OnTextChanged and Button Click Event Not Firing

  - by goodwince

  I have textboxes being generated by a repeater that use OnTextChanged with autopostback enabled so that I can know when when the values change. This all works perfect. The problem starts when I try to click on any buttons on the page. The loss of focus triggers the event for the OnTextChanged; however, the event for my buttons never get fired. I checked this in the debugger and while debugging if I put a break-point in the page_load it will call both; however, without the break-point it still only calls the OnTextChanged event. I found this post on JavaScript. If my problem is also JavaScript related, why does the clicking of the button fire in debug mode? Thanks.

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• Spring AOP Pointcut syntax for AND, OR and NOT

  - by ixlepixle

  I'm having trouble with a pointcut definition in Spring (version 2.5.6). I'm trying to intercept all method calls to a class, except for a given method (someMethod in the example below). <aop:config> <aop:advisor pointcut="execution(* x.y.z.ClassName.*(..)) AND NOT execution(* x.y.x.ClassName.someMethod(..))" /> </aop:config> However, the interceptor is invoked for someMethod as well. Then I tried this: <aop:config> <aop:advisor pointcut="execution(* x.y.z.ClassName.(* AND NOT someMethod)(..)) )" /> </aop:config> But this does not compile as it is not valid syntax (I get a BeanCreationException). Can anybody give any tips?

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• How to integrate KVC in MVC?

  - by Paperflyer

  So I have an MVC-application in Cocoa. There are some custom views, a controller and a model. Of course, the views need to know some stuff, so they get their data from the controller. However, they do not use accessors in the controller, they use KVC with a keypath that calls right through to the model: // In view.m time = [timeSource valueForKeyPath:@"theModel.currentTime"]; // timeSource is a pseudo-delegate of the view that holds the controller This simplifies things a great deal and technically, the views still don't know the model in person (that is, in pointer). But of course, they access it directly. Is that a usual (or at least sensible) usage of KVC and MVC? Or how would you implement this kind of communication?

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• Loading Separate Pages With Animation in JQTouch

  - by Donovan Keith

  I'm trying to convert a database-driven multiple-choice-style study website (written in JSP) into an iPhone app using JQTouch. If I load all of the Q&A's into their own divs in the same file I can easily link and animate between them using links to hashtags, like: a class="button" href="#question22" Unfortunately this isn't practical. The logic of the website as it currently works requires calls to a number of dynamically generated pages; I can't include every question in its own div in the same flat file. How would I go about dynamically (pre)loading the next question (a JSP page like AskQuestion.jsp?questionId=Kzhctand ) then serving that up within the app after the user presses a button? Thanks for any help you might offer. -Donovan

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• jquery buttonset()

  - by Kevin

  Hi - I'm using the jquery buttonset() on a set of radio buttons (to tart them up). I'd like to be able to set the selected radio button on another user event. I've been looking into this and while I can set the selected radio button, but I cannot also (easily) update the UI to indicate what the selected radio button is. From what I can tell, I need to call this to set the radio button at index n to be checked $('input[name="transactionsRadio"]')[n].checked = true; And then do some convoluted jquery selector calls to remove the ui-state-active from one lable and apply it to the new label. Is this really the most optimal way to do this ? I had expected an equivalent method to the 'activate' method that is available for the jquery Accordian control. Any more elegant solution would be appreciated! Thanks, Kevin.

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• Horizontal lines and PDF drawing on iPhone/iPad Quartz 2D

  - by aron

  I'm trying to display a PDF of music using the Quartz 2D calls: CGPDFDocumentGetPage and CGPDFPageGetDrawingTransform The problem is that some horizontal lines in the PDF get drawn thicker than others. The biggest problem is that I notice this in Preview on the Mac and on iPhone/iPad. Even when viewing this PDF in the iPhone/iPad mail, I get the same problem. Here is the example: http://aronnelson.com/problem/pdfproblem.jpg Note that the PDF on the left is preview, the PDF on the right is the same file but in Google Docs. See how clean the Google Docs version is? Is there any way to fix this problem? Would it help to draw the PDF larger and zoom down using a UIScrollView? Any help appreciated. I can't find much info re: this problem. Aron

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• ExternalInterface in flex calling javascript function works for mozilla/chrome but NOT IE

  - by Rees

  hello, i have a flex application that does a simple ExternalInterface.call("shareOptions"), which calls a shareOptions() javascript method and works absolutely fine with Mozilla and chrome, however when I test with IE i get the following error: Error: [object Error] at flash.external::ExternalInterface$/_toAS() at flash.external::ExternalInterface$/call() I looked at the adobe livedocs documentation but can't determine what the issue is with IE. is there something i'm missing?? if anyone knows, please let me know ASAP! thanks in advance. private function shareOptions(event:MouseEvent):void{ ExternalInterface.marshallExceptions = true; if (ExternalInterface.available){ ExternalInterface.call("shareOptions"); } } the javascript <script language="JavaScript" type="text/javascript"> function shareOptions() { myWin = window.open('http://www.mysite.shareOptions.php','yeee!','width=640,height=690,toolbar=no,location=0,directories=no,status=no,menubar=no,scrollbars=no,copyhistory=no,resizable=yes,x=500,y=500'); myWin.moveTo(300,300); } </script>

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• Best current framework for unit testing EJB3 / JPA

  - by kennygrimm

  Starting new project using EJB 3 / JPA, mainly stateless session beans and batch jobs. I've used JUnit in the past on standard Java webapps and it seemed to work pretty well. In EJB2 unit testing was a pain and required a running container such as JBoss to make the calls into. Now that we're going to be working in EJB3 / JPA I'd like to know what companies are using to write and run these tests. Are Junit and JMock still considered relevant or are there other newer frameworks that have come around that we should investigate?

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• Implement JNI listener.

  - by G B

  I have the following code in a c++ "listener class" (more or less), which calls some function of a Java object. I suspect there's a memory leak: JNIEnv *env = NULL; vm_->AttachCurrentThread(&env, NULL); const jclass cls = env->FindClass(...); const jmethodID meth = env->GetMethodID(...); const jobject obj = env->NewObject(cls, meth, ...); [ more code ] env->DeleteLocalRef(obj); My question is: should I also release the local reference of cls and meth? JNI Documentation isn't very clear about it.

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• Monitor files similar to System Internal's/Microsoft's FileMon/Process Monitor

  - by Tom1952

  I need to generate an event when a file is closed by another app. Unfortunately, ReadDirectoryChangesW doesn't report the close event. It would be possible for me to poll (with a TTimer) any file that reported by ReadDirectoryChangesW as modified, waiting for it to be closed (using CreateFile to detect this). However, what I'd prefer is a completely event driven solution. Is there a way to hook system calls and detect all file closing events? I simply want to know the path & name of any file that has just been closed.

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• Calling WCF Service from Action Script 2

  - by Frank

  Hi All, I am a .NET programmer working with a Flash designer on a project. The design is that they will create a flash UI (implemented with AS2) to present a questionnaire. After it is completed by an end user, the will send me (a .net web service of some form) the answers to the questionnaire, I will perform a calculation, and I will send a response back (the response will likely be a single integer, though it may be a touple of (integer score, string description). Neither myself nor the designer is knowledgeable of Action Script. Does anyone have a snippet for such web service calls in AS2? Are there any soap libraries for AS2 that we could use, or should I expose a RESTful interface? Can it be as simple as having the designer concat the questionnaire answers into the query string of the service URL? What would be a typical data format for my response (xml, json, plain text) Thanks in advance for your help. Frank

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• Session variable in WCF application

  - by kaivalya

  I need to use or stimulate a very simple session object inside my WCF app. I simply need to store some values at the beginning of a call and I need access to these values while I go through some different methods of my service. Asp.NET session would be very ideal to use for this so I need to find out what is available on a WCF app for storing such values. Note: this is just a per call session, I don't need to retain this session between different calls from the client to service and such..

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• ASP.NET MVC2 and AJAX

  - by Jason

  I am currently developing a new website utilizing ASP.NET MVC2. Much of what I want to do with the website (from a front-end standpoint) involves AJAX-y-type tasks. Two examples: I want to display forms, and switch between them via a drop-down menu (or through links) without having to go back and hit the server every single time. I want the user to be able to select points on a Chart Control and have portions of the page refresh with the appropriate data depending on what he/she selects (partial page refresh). In both these cases, I am able to accomplish what I wish to accomplish using the traditional web forms event handlers, etc. Unfortunately, the use of a ScriptManager violates the spirit of MVC. It seems as if MVC prevents the use of many of the controls that are available to ASP.NET. So, my question is: how do I use AJAX and make AJAX calls without utilizing ScriptManager and the web forms method of utilizing event handlers?

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• C# - Screenshot of process under Windows Service

  - by Jonathan.Peppers

  We have to run a process from a windows service and get a screenshot from it. We tried the BitBlt and PrintWindow Win32 calls, but both give blank (black) bitmaps. If we run our code from a normal user process, it works just fine. Is this something that is even possible? Or could there be another method to try? Things we tried: Windows service running as Local System, runs process as Local System - screenshot fails Windows service running as Administrator, runs process as Administrator - screenshot fails. Windows application running as user XYZ, runs a process as XYZ - screenshot works with both BitBlt or PrintWindow. Tried checking "Allow service to interact with desktop" from Local System We also noticed that PrintWindow works better for our case, it works if the window is behind another window. For other requirements, both the parent and child processes must be under the same user. We can't really use impersonation from one process to another.

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• Getting stored procedure's return value with iBatis.NET

  - by MikeWyatt

  How can I retrieve the return value of a stored procedure using iBatis.NET? The below code successfully calls the stored procedure, but the QueryForObject<int> call returns 0. SqlMap <procedure id="MyProc" parameterMap="MyProcParameters" resultClass="int"> MyProc </procedure> <parameterMap id="MyProcParameters"> <parameter property="num"/> </parameterMap> C# code public int RunMyProc( string num ) { return QueryForObject < int > ( "MyProc", new Hashtable { { "num", num } } ); } Stored Procedure create procedure MyProc @num nvarchar(512) as begin return convert(int, @num) end FYI, I'm using iBatis 1.6.1.0, .NET 3.5, and SQL Server 2008.

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• Getting started with zxing on android

  - by amitlicht

  Hi I'm trying to add zxing to my project (add a button which calls the scanner upon press). I found this: http://groups.google.com/group/android-developers/browse_thread/thread/788eb52a765c28b5 and of course the zxing homesite: http://code.google.com/p/zxing/, but still couldn't figure out what to include in the project classpath to make it all work! as for now, I copied the classes in the first link to my project (with some package name changes), and it runs but crashes after pressing the button and trying to install the barcode scanner. some code: private void setScanButton(){ Button scan = (Button) findViewById(R.id.MainPageScanButton); scan.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { IntentIntegrator.initiateScan(MyActivity.this); } }); } resulting error (from logcat): 06-13 15:26:01.540: ERROR/AndroidRuntime(1423): Uncaught handler: thread main exiting due to uncaught exception 06-13 15:26:01.560: ERROR/AndroidRuntime(1423): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=market://search?q=pname:com.google.zxing.client.android } Ideas?

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• How to change the datasource on a YUI datagrid after creation

  - by Simon

  I am using the Yahoo DataTable for which the API is here. I am having difficulty changing the data once I have rendered the grid once. I am using jQuery to get data via AJAX, or from a client side data island and need to put this back into the grid. There is no setDataSource method in the DataTable API, and changing 'dataSource.liveData' does not update the grid. // does not work dataTable.dataSource.liveData = [ {name:"cat"}, {name:"dog"}, {name:"mouse"}; The example I am basing my code on is the basic LocalDataSource example. How can I update the data source without having to completely recreate the table. I do NOT want to use the YUI datasources that make Async calls. I need to know how I can do this 'manually'.

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• Hitting a ADO.NET Data Services from WPF client, forms authentication

  - by Soulhuntre

  Hey all! There are a number of questiosn on StackOverflow that ALMOST hit this topic head on, but they are either for other technologies, reference obsolets information or don;t supply an answer that I can suss out. So pardon the almost duplication :) I have a working ADO.NET Data Service, and a WPF client that hits it. Now that they are working fine I want to add authentication / security to the system. My understanding of the steps so far is... Turn on forms authentication and configure it on the server (I have an existing asp.net membership service DB for other aspects of this app, so that isnt a problem) so that it is required for the service URL In WCF apply for and recieve a forms authentication "ticket" as part of a login routine Add that "ticket" to the headers of the ADO.NET service calls in WPF Profit! All well and good - but does anyone have a line on a soup to nuts code sample, using the modern releases of these technologies? Thanks!

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