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• Performance of Managed C++ Vs UnManaged/native C++

  - by bsobaid

  I am writing a very high performance application that handles and processes hundreds of events every millisecond. Is Unmanaged C++ faster than managed c++? and why? Managed C++ deals with CLR instead of OS and CLR takes care of memory management, which simplifies the code and is probably also more efficient than code written by "a programmer" in unmanaged C++? or there is some other reason? When using managed, how can one then avoid dynamic memory allocation, which causes a performance hit, if it is all transparent to the programmer and handled by CLR? So coming back to my question, Is managed C++ more efficient in terms of speed than unmanaged C++ and why?

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• How to use FBJS to get the language preference of the user?

  - by ed.talmadge

  I'm modifying an existing FaceBook application. The FaceBook application is generated by another application, so I don't have much control over it. I can only add html/javascript. My goal is to use FBJS to detect the current language setting of the user and display a different message depending on their language. For example, if the user has their language setting set to Spanish, then I would like to show a message in Spanish on my FaceBook application. How can I do this?

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• Tabbed browsing, programaticaly navigating to another open tab

  - by jdr120

  Hello, I'm in a discussion with my co-worker. We have a web application in a tabbed browsing environment, say with 2 tabs open. Tab2 has a link to tab1, when I click the link, it opens tab1 in a new tab. We want to detect if tab 1 is already open, if so then set focus to tab1 (and not open a new window). He has gotten this working in a broswer window environment, but says it is not possible in a tabbed environment. Is it possible to for javascript to determine if tab1 is already open and then just set focus to that tab? Thanks in advance!

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• "paste" listener on a SWT widget

  - by Fredrik

  I have an application with a SWT widget, say a org.eclipse.swt.widgets.Text, and want to add some control to the paste function. The idea is that if the user can paste a string of IDs, I detect that, run some code and paste the object that corresponds to the IDs. So I'm looking for some "ClipBoardListener" of some sort to add to my widget, but that doesnt seem to exist. A keylistener would only trap the pastes done by key and then you would have to deal with different key combos for pasting in different OS's. Based on this java 1.2 question I tried subclassing the text class and override the inser method, but that didnt work Exception in thread "main" org.eclipse.swt.SWTException: Subclassing not allowed Seemed like an ugly solution anyway.

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• Detecting a message box launched in another application

  - by richard-assaf

  I am developing a windows service, in vb .et, that launches a legacy application that performs some work. The service acts as a wrapper around the legacy app allowing users to automate an otherwise manual operation. Everything is working great, except occasionally the legacy app displays a messagebox. When it does this the process halts until the the message box closes. As the service will be running on a server there will be no user to close the message box. The service launches the legacy application in a System.Diagnostics.Process. My question is, is there way to detect that a message box has been displayed by a process that I have started using System.Diagnostics.Process and is there a way to through code to close the messagebox. I've tried to be brief so if you need more information please let me know. Thanks in advance Richie

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• How can you tell if an activity is starting or resuming?

  - by Joren

  I have an activity which pulls some JSON from my server, and then uses it to draw a list. That list launches further activities. My problem is that I can't figure out a way to tell if the activity is still alive when you go back to it, so I end up re-querying my JSON from the server and redrawing the list every time the user goes back to the activity. How can I tell if my activity is still alive so I can skip the redraw? Using onRestart works for hitting the home key then going back, but onCreate not onRestart is called if I selected a list item then hit back.

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• Bash variable kills script execusion

  - by Kyle Terry

  Sorry if this is better suited at serverfault, but I think it learns more towards the programming side of things. I have some code that's going into /etc/rc.local to detect what type of touch screen monitor is plugged in and changes out the xorg.conf before launching X. Here is a small snippet: CURRENT_MONITOR=`ls /dev/usb | grep 'egalax_touch\|quanta_touch'` case $CURRENT_MONITOR in '') CURRENT_MONITOR='none' ;; esac If one of those two touch screens is plugged in, it works just fine. If any other monitor is plugged in, it stops at the "CURRENT_MONITOR=ls /dev/usb | grep 'egalax_touch\|quanta_touch'." For testing I touched two files. One before creating CURRENT_MONITOR and one after CURRENT_MONITOR and only file touched before is created. I'm not a bash programmer so this might be something very obvious.

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• How and when to log account access login with PHP?

  - by Nazgulled

  I want to implement a basic login system in some PHP app where no cookies will be involved. I mean, the user closes the browser and the login expires, it will remain active during the browser session (or if the user explicitly logs out) otherwise. I want to log all this activity and I'm thinking that every time the user refreshes the page, opens a different link or logs out, I record that time as the last access made by that user, overwriting the previous access log. But my problem is when and how should I insert another record into the database instead of overwriting the last one? Should I just define a timeout and if the last access was made above that timeout, another log should be inserted into the database? Should the session expire too after that timeout? Or is there a better way? Ideally, I would like to log the "log out action" when the browser was closed, but I don't think there's a way to detect that is there? Suggestions?

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• What is ExtJS philosophy? Single page application?

  - by stach

  I need to write my next project using ExtJs. It's a nice Javascript lib but I don't fully understand the idea behind it. Take the docs page for example: http://www.extjs.com/deploy/dev/docs/ Am I supposed to write my web applications with extjs like that? One page that should never be refreshed, and everything getting done by AJAX? How do you debug such applications if getting to the right place may take a lot of 'clicking' and working with it. You cannot fix the bug and hit refresh in the browser to see the results. Any suggestions?

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• OpenGL Performance Questions

  - by Daniel

  This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want. A lot of tutorials, and even SO questions have similar tips; generally covering: Use GL face culling (the OpenGL function, not the scene logic) Only send 1 matrix to the GPU (projectionModelView combination), therefore decreasing the MVP calculations from per vertex to once per model (as it should be). Use interleaved Vertices Minimize as many GL calls as possible, batch where appropriate And possibly a few/many others. I am (for curiosity reasons) rendering 28 million triangles in my application using several vertex buffers. I have tried all the above techniques (to the best of my knowledge), and received almost no performance change. Whilst I am receiving around 40FPS in my implementation, which is by no means problematic, I am still curious as to where these optimisation 'tips' actually come into use? My CPU is idling around 20-50% during rendering, therefore I assume I am GPU bound for increasing performance. Note: I am looking into gDEBugger at the moment Cross posted at Game Development

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• reloadData not working - suspect cell's reuseIdentifier

  - by retailevolved

  I have a view controller that gets presented modally and changes some data that effects the data in a uitableview in the modal's parent view controller (a table view). I call the tableview's reloadData method when the parent view reappears. I have confirmed that this code gets hit with a break point. My trouble is, reloadData isn't working. Here's the kicker - if I don't use reuseIdentifiers in the - (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath method, the data reloads correctly. It looks like the reuseIdentifier is to blame. I really want to continue to use the reuseIdentifier for my cells - how do I make this work?

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• Help using Lisp debugger

  - by Joel

  I'm trying understand how to interpret the output of, and use, the Lisp debugger. I've got a pretty simple Backtrace for the evaluation of my function, but I cann't seem to work out how to use it to find out in which Lisp 'form' in my function the exception occurred. I'd appreciate any clues as to what I should be doing, to find the source of the error. I've attached a screen shot (if it's too small to read I can re-post it in parts), with the debug output, the function and the repl (please ignore my very wrong function, I'm just interested in learning how to use the debugger properly). In addition, I hit 'v' on the first frame to go to the source, but this resulted in the error at the bottom of the screen.

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• How to create a glib.Source from Python?

  - by Matt Joiner

  I want to integrate some asyncore.dispatcher instances into GLib's default main context. I figure I can create a custom GSource that's able to detect event readiness on the various sockets in asyncore.socket_map. From C I believe this is done by creating the necessary GSourceFuncs which could involve cheap and non-blocking calls to select, and then handling them using asyncore.read, .write and friends. How do I actually create a GSource from Python? The class glib.Source is undocumented, and attempts to use the class interactively have been in vain. Is there some other method that allows me to handled socket events in the asyncore module without resorting to timeouts (or anything that endangers potential throughput and CPU usage)?

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• YUI Autocomplete: itemSelectEvent getting lost with IE6 and IE7?

  - by Parand

  I'm using YUI Autocomplete (latest version loaded using loader as of today (May 14th, 2010), which looks to be 2.8.1, with the following options: ac = new YAHOO.widget.AutoComplete("mynode", "autocomp_node", ac_ds, {typeAhead: true, forceSelection: true}); ac.itemSelectEvent.subscribe( function(type, args) { alert("hey:" + args[2][1]); $('#parent_id').val(args[2][1]); }); The itemSelectEvent catches selections in AutoComplete and fills in some data on the parent. This works on FF, Chrome, Safari, and IE8. On IE6 and IE7, however, the event never seems to trigger. To replicate: In the autocomplete field, allow it to autofill for you, then hit enter. This should select the autofill and move on to the next field (that's what it does in other browsers). With IE6 and IE7 it seems to instead trigger the form submission - the itemSelectEvent never fires (or perhaps fires after the form submission?). Has anyone seen this? Any work-arounds?

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• Same Activity called twice... Issue with Multiple AsyncTasks?

  - by stormin986

  I have three simultaneous instances of an AsyncTask for download three files. When two particular ones finish, at the end of onPostExecute() I check a flag set by each, and if both are true, I call startActivity() for the next Activity. I am currently seeing the activity called twice, or something that resembles this type of behavior. Since the screen does that 'swipe left' kind of transition to the next activity, it sometimes does it twice (and when I hit back, it goes back to the same activity). It's obvious two versions of the activity that SHOULD only get called once are being put on the Activity stack. Could this be from both onPostExecute()s executing simultaneously and both checking the flags each other set at the exact same time? This seems extremely unlikely since two processes would have to be running line-by-line in parallel... *EDIT* A lot removed from this question since I was way off in what I thought was wrong. Nonetheless I found the answer here quite useful, so I have edited the question to reflect the useful parts.

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• SQL SELECT with time range

  - by nLL

  Hi, I have below click_log table logging hits for some urls site ip ua direction hit_time ----------------------------------------------------- 1 127.0.0.1 1 20010/01/01 00:00:00 2 127.0.0.1 1 20010/01/01 00:01:00 3 127.0.0.1 0 20010/01/01 00:10:00 .... ......... I want to select incoming hits (direction:1) and group by sites that are: from same ip and browser logged within 10 minutes of each other occured more than 4 times in 10 minutes. I'm not sure if above was clear enough. English is not my first language. Let me try to explain with an example. If site 1 gets 5 hits from same ip and browser with in 10 minutes after getting first unique hit from that ip and browser i want it to be included in the selection. Basically I am trying to find abusers.

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• In JSF, how to handle repeating over a list that mutates

  - by Jon

  Hello, In a JSF page, I am iterating over a list of items provided by a session-scoped backing bean. The list needs to be kept up-to-date, so it is replaced with a fresh list every X minutes by a thread (in a thread-safe way). On my page, for each item I provide some text inputs and an "Update" button. If the list is refreshed before I hit "Update", the update does not happen (which is my problem). I happen to be using a4j:repeat, but I think this could also apply to other methods of iteration, including using dataTables. Any thoughts on how I can do this in a non-hackish way? Thanks!

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• Javascript Regex multiple group matches in pattern

  - by mummybot

  I have a question for a Javascript regex ninja: How could I simplify my variable creation from a string using regex? I currently have it working without using any grouping, but I would love to see a better way! The string is: var url = 'resources/css/main.css?detect=#information{width:300px;}'; The code that works is: var styleStr = /[^=]+$/.exec(url).toString(); var id = /[^\#][^\{]+/.exec(styleStr).toString(); var property = /[^\{]+/.exec(/[^\#\w][^\:]+/.exec(styleStr)).toString(); var value = /[^\:]+/.exec(/[^\#\w\{][^\:]+[^\;\}]/.exec(styleStr)).toString(); This gives: alert(id) //information alert(property) //width alert(value) //300px Any takers?

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• MongoDB map/reduce counts

  - by ibz

  The output from MongoDB's map/reduce includes something like 'counts': {'input': I, 'emit': E, 'output': O}. I thought I clearly understand what those mean, until I hit a weird case which I can't explain. According to my understanding, counts.input is the number of rows that match the condition (as specified in query). If so, how is it possible that the following two queries have different results? db.mycollection.find({MY_CONDITION}).count() db.mycollection.mapReduce(SOME_MAP, SOME_REDUCE, {'query': {MY_CONDITION}}).counts.input I thought the two should always give the same result, independent of the map and reduce functions, as long as the same condition is used.

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• Get touches from UIScrollView

  - by Peter Lapisu

  Basically i want to subclass UIScrollView and hande the touches, however, the touch methods dont get called (i searched the web for a solution and i found out people pointing to override the hit test, what i did, but with no result :( ) .h @interface XScroller : UIScrollView @end .m - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event { UIView *result = nil; for (UIView *child in self.subviews) { if ([child pointInside:point withEvent:event]) { if ((result = [child hitTest:point withEvent:event]) != nil) { break; } } } return result; } - (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"BEGAN"); [super touchesBegan:touches withEvent:event]; } - (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"MOVED"); [super touchesMoved:touches withEvent:event]; } - (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"ENDED"); [super touchesEnded:touches withEvent:event]; } - (void) touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"CANCELED"); [super touchesCancelled:touches withEvent:event]; } none of the - (void) touches* methods get called, the scrolling works ok

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• JQuery delegate what may cause it to not function

  - by Jafin

  I have a webpage using jquery 1.42 The following 2 segments of code live in my page. $('body').delegate('h2', 'click', function() { $(this).after("<p>delegate paragraph!<\/p>"); }); $('body h2').live('click', function() { $(this).after("<p>live paragraph!<\/p>"); }); The live method always works, yet the delegate doesn't fire at all. If I create a trivial page with simple html <body><h2>blah</h2></body> both approaches work. So I'm assuming there is something else going on in my page. With firebug I am seeing no javascript errors, no html errors. and breakpoints on the delegate method definately do not get hit. What else might be the cause of delegate not triggering?

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• ASP.NET MVC 2 Areas, Strange routing behavior

  - by user137348

  I've created an Area named "Admin". I've created also a controller(Pages) and a view(List) in this areas. When I run my app and enter the url "/Admin/Pages/List" I'm getting an The resource cannot be found error. When I enter /Pages/List, the Action method is hit but the view is not found,because the app is searching in wrong directories ~/Views/Pages/List.aspx ~/Views/Pages/List.ascx ~/Views/Shared/List.aspx ~/Views/Shared/List.ascx the view is in /Admin/Pages/List. My routing conf for Admin area: public class AdminAreaRegistration : AreaRegistration { public override string AreaName { get { return "Admin"; } } public override void RegisterArea(AreaRegistrationContext context) { context.MapRoute( "Admin_default", "Admin/{controller}/{action}/{id}", new { controller= "Pages",action = "Index", id = "" } ); } }

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• Rails: Routing to a different controller based on request format

  - by Jimmy Cuadra

  I'm writing an app where I want all requests for HTML to be handled by the same controller action. I have some other routes that are JSON-specific. Here's what my routes look like: Blog::Application.routes.draw do constraints format: :json do resources :posts end match "(*path)" => "web#index" end The problem is that constraints is being interpreted as "this route only works with the specified format" rather than "skip this route and try the next one if the request is not in the specified format." In other words, navigating to /posts in the browser gives me a 406 Not Acceptable because the URL is constrained to the JSON format. Instead, I want it to fall through to web#index if the request is for HTML, and hit the resourceful route if the request is for JSON. How can this be achieved? (Using Rails 3.2.9.)

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• How do I integrate WordPress blogs with my Grails application?

  - by Amit Jain

  I had my static site with which WordPress blogs were integrated. Now I have made a Grails application with which I want to integrate those WordPress blogs. I had put the WordPress folder copied from my previous site to the web-app folder of my Grails application. But I am not able to access the WordPress folder, as when I hit URL - http://localhost:8080/myApplicaiton/wordpress/, it shows this error: Error 500: java.net.SocketTimeoutException: Read timed out Also, in my urlMappings.groovy one of the mappings I need is "/$generalPageURL"(controller:'myConroller', action:'myAction') And if I put in the above mapping, all requests for WordPress goes to myAction of myController. Is there any way out to still reach the WordPress folder defined inside web-app folder with the above mapping?

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• Bash variable kills script execution

  - by Kyle Terry

  Sorry if this is better suited at serverfault, but I think it learns more towards the programming side of things. I have some code that's going into /etc/rc.local to detect what type of touch screen monitor is plugged in and changes out the xorg.conf before launching X. Here is a small snippet: CURRENT_MONITOR=`ls /dev/usb | grep 'egalax_touch\|quanta_touch'` case $CURRENT_MONITOR in '') CURRENT_MONITOR='none' ;; esac If one of those two touch screens is plugged in, it works just fine. If any other monitor is plugged in, it stops at the "CURRENT_MONITOR=ls /dev/usb | grep 'egalax_touch\|quanta_touch'." For testing I touched two files. One before creating CURRENT_MONITOR and one after CURRENT_MONITOR and only file touched before is created. I'm not a bash programmer so this might be something very obvious.

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