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• Creating C++ client app for some abstract windows server - how to manage TCP connection to server speed?

  - by Kabumbus

  So we have some server with some address port and ip. we are developing that server so we can implement on it what ever we need for help. What are standard/best practices for data transfer speed management between C++ windows client app and server (C++)? My main point is in how to get how much data can be uploaded/downloaded from/to client via his low speed network to my relatively super fast server. (I need it for set up of his live stream Audio/Video bit rate) My try on explaining number 3. We do not care how fast is our server. It is always faster than needed. We care about client tyring to stream out to our server his media. he streams encoded (via ffmpeg) live video data to our server. But he has say ADSL with 500kb/s of outgoing traffic. Also he uses some ICQ or what so ever so he has less than 500 kb/s per second. And he wants to stream live video! So we need to set up our ffmpeg to encode video with respect to the bit rate user can provide. We develop server side and client side. We need a way of finding out how much user can upload per second currently (so value can change dynamically over time)

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• Error 100 When Attempting to post from app to Facebook wall?

  - by IMAPC

  I'm playing around with the Facebook API, and have gotten far enough to get the access token into my app, but when I go to actually send a post to my Facebook wall I get the error message, {"error":{"message":"(#100) You can't post this because it has a blocked link.","type":"OAuthException","code":100}}1 I'm not attempting to send any kind of link, just "Hello, World!" so this seems pretty weird to me :\ Here's my code so far: $content = urlencode("Hello, World!"); $accesstoken = urlencode($row['fbid']); $result = getPageWithPOST("https://graph.facebook.com/me/feed", "access_token=" . $accesstoken . "&message=" . $content); echo $result; where getPageWithPOST is, function getPageWithPOST($url, $posts) { $c = curl_init(); curl_setopt($c, CURLOPT_URL, $url); curl_setopt($c, CURLOPT_POST, true); curl_setopt($c, CURLOPT_POSTFIELDS, $posts); $content = curl_exec ($c); curl_close ($c); return $content; } thanks!

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• Structuring the UI code of a single-page EXTjs Web app using Rails?

  - by Daniel Beardsley

  I’m in the process of creating a large single-page web-app using ext-js for the UI components with Rails on the backend. I’ve come to good solutions for transferring data using Whorm gem and Rails support of RESTful Resources. What I haven’t come to a conclusion on is how to structure the UI and business logic aspects of the application. I’ve had a look at a few options, including Netzke but haven’t seen anything that I really think fits my needs. How should a web-application that uses ext-js components, layouts, and controls in the browser and Rails on the server best implement UI component re-use, good organization, and maintainability while maintaining a flexible layout design. Specifically I’m looking for best-practice suggestions for structuring the code that creates and configures UI components (many UI config options will be based on user data) Should EXT classes be extended in static JS for often re-used customizations and then instantiated with various configuration options by generated JS within html partials? Should partials create javascript blocks that instantiate EXT components? Should partials call helpers that return ruby hashes for EXT component config which is then dumped to Json? Something else entirely? There are many options and I'd love to hear from people who've been down this road and found some methodology that worked for them.

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• The Current State Of Serving a PHP 5.x App on the Apache, LightTPD & Nginx Web Servers?

  - by Gregory Kornblum

  Being stuck in a MS stack architecture/development position for the last year and a half has prevented me from staying on top of the world of open source stack based web servers recent evolution more than I would have liked to. However I am now building an open source stack based application/system architecture and sadly I do not have the time to give each of the above mentioned web servers a thorough test of my own to decide. So I figured I'd get input from the best development community site and more specifically the people who make it so. This is a site that is a resource for information regarding a specific domain and target audience with features to help users not only find the information but to also interact with one another in various ways for various reasons. I chose the open source stack for the wealth of resources it has along with much better offers than the MS stack (i.e. WordPress vs BlogEngine.NET). I feel Java is more in the middle of these stacks in this regard although I am not ruling out the possibility of using it in certain areas unrelated to the actual web app itself such as background processes. I have already come to the conclusion of using PHP (using CodeIgniter framework & APC), MySQL (InnoDB) and Memcached on CentOS. I am definitely serving static content on Nginx. However the 3 servers mentioned have no consensus on which is best for dynamic content in regards to performance. It seems LightTPD still has the leak issue which rules it out if it does, Nginx seems it is still not mature enough for this aspect and of course Apache tries to be everything for everybody. I am still going to compile the one chosen with as many performance tweaks as possible such as static linking and the likes. I believe I can get Apache to match the other 2 in regards to serving dynamic content through this process and not having it serve anything static. However during my research it seems the others are still worth considering. So with all things considered I would love to hear what everyone here has to say on the matter. Thanks!

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• How do I convert a simple ruby flashcard program into a ROR app?

  - by Mark Wilbur

  What I'm trying to do is make a basic flashcard app on rails. At this point, all I'm looking for is the functionality to iterate through a list of flashcards, quiz the user and let the user know if they were right or not. In ruby, it didn't take me long to write: class Card attr_accessor :answer, :question def initialize(answer = "", question="") @answer = answer @question = question end def quiz puts "What does #@question mean?" answer = gets.chomp if answer == @answer puts "Right" return true else puts "Wrong" return answer end end end class Cardlist attr_accessor :Cards def initialize(Cards = []) @Cards = Cards end def quiz Cards.each do |w| w.quiz end end end The problem I'm having with rails is figuring out where to put the logic to loop through all the cards in the list. I've made models specifying that Card belongs_to cardlist and that Cardlist has_many cards. I know application logic should go in the controller, but if I were to make a "quiz" action for my Cardlist controller, how would I make it iterate through all the cards? After each "quiz" page generated, I'd need to get an answer back from the user, respond (maybe flash) whether it was right or not and then continue onto the next question. Would any of that logic have to go into the view in order to make sure it's sending back the user inputted answers to the controller?

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• My app crash with MFMailComposeViewController and MFMessageComposeViewController when I re-launch it.

  - by Dolwen

  Hello all, I encounter a crash with MFMailComposeViewController, MFMessageComposeViewController and multitasking on IOS 4.2 (both simulator and IPHone 4). Code i use : Class emailClass = (NSClassFromString(@"MFMailComposeViewController")); if( emailClass != nil ) { MFMailComposeViewController * controller = [[emailClass alloc] init]; if([emailClass canSendMail]) { // delegate controller.mailComposeDelegate = self; // subject [controller setSubject:@"Hello All."]; // main message [controller setMessageBody:@"I love Stackoverflow.com !" isHTML:NO]; // adding image attachment // getting path for the image we have in the tutorial project NSString *path = [[NSBundle mainBundle] pathForResource:@"image" ofType:@"png"]; // loading content of the image into NSData NSData *imageData = [NSData dataWithContentsOfFile:path]; // adding the attachment to he message [controller addAttachmentData:imageData mimeType:@"image/png" fileName:@"My Byook image"]; // setting different than the default transition for the modal view controller [controller setModalTransitionStyle:UIModalTransitionStyleCoverVertical]; // show [[CGameStateManager getCurrentGameState] presentModalViewController:controller animated:YES]; } [controller release]; } To close MFMailComposeViewController i use : [[CGameStateManager getCurrentGameState] dismissModalViewControllerAnimated:NO]; Then the app crash on the "dismissModalViewControllerAnimated:" and we can read in the debugger with NSZombieEnabled : * -[UIImage isKindOfClass:]: message sent to deallocated instance 0xb0b9f80 Anyone have an answer to solve my problem ? :) Thx

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• What type of data store should I use for my ios app?

  - by mwiederrecht

  I am pretty new to ios and using servers so forgive me. I am building an ios app for research. I need to monitor things that the user does and then push it up to a server for analysis (yes, with user and IRB permission). On the client's side I need to keep quite a bit of data that won't really change except in the case of pulling an updated version from the server, and then a minimal amount of user-specific data. Most of the data I will collect needs to be pushed to a server for analysis and then can be deleted from the client side. I am struggling to figure out what kind of data store I need to use, especially since I am not quite sure how the pushing and pulling from the server process works yet. Does it make sense to use Core Data? XML? SQLite? I like the Core Data idea, but I am not sure what kind of problems I will run into when I need to send large amounts of data to it and from it from the server. I imagine I might need to send data in a different form than it is probably stored in on either end - so what kind of overhead am I likely to run into in the process of converting that data? Is there a good format to save stuff in that would work well for me on both ends AND for sending the data? As you can probably tell, I could use some advice. Thanks!

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• MVC design pattern in complex iPad app: is one fat controller acceptable?

  - by nutsmuggler

  I am building a complex iPad application; think of it as a scrapbook. For the purpose of this question, let's consider a page with two images over it. My main view displays my doc data rendered as a single UIImage; this because I need to do some global manipulation over them. This is my DisplayView. When editing I need to instantiate an EditorView with my two images as subviews; this way I can interact with a single image, (rotate it, scale it, move it). When editing is triggered, I hide my DisplayView and show my EditorView. In a iPhone app, I'd associate each main view (that is, a view filling the screen) to a view controller. The problem is here there is just one view controller; I've considered passing the EditorView via a modal view controller, but it's not an option (there a complex layout with a mask covering everything and palettes over it; rebuilding it in the EditorView would create duplicate code). Presently the EditorView incorporates some logic (loads data from the model, invokes some subviews for fine editing, saves data back to the model); EditorView subviews also incorporate some logic (I manipulate images and pass them back to the main EditorView). I feel this logic belongs more to a controller. On the other hand, I am not sure making my only view controller so fat a good idea. What is the best, cocoa-ish implementation of such a class structure? Feel free to ask for clarifications. Cheers.

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• how do i make the app take correct input..?

  - by user1824343

  This is my windows app's one layout which converts Celsius to Fahrenheit. The problem is that when I try to input the temperature it shows some junk(for eg: if i enter '3' it displayin '3.0000009') and sometimes its even showing stack overflow exception. The output is also not shown properly : cel.text is the textbox for celsius. fahre.text is the textbox for fahrenheit. namespace PanoramaApp1 { public partial class FahretoCel : PhoneApplicationPage { public FahretoCel() { InitializeComponent(); } private void fahre_TextChanged(object sender, TextChangedEventArgs e) { if (fahre.Text != "") { try { double F = Convert.ToDouble(fahre.Text); cel.Text = "" + ((5.0/9.0) * (F - 32)) ; //this is conversion expression } catch (FormatException) { fahre.Text = ""; cel.Text = ""; } } else { cel.Text = ""; } } private void cel_TextChanged(object sender, TextChangedEventArgs e) { if (cel.Text != "") { try { Double c = Convert.ToDouble(cel.Text); fahre.Text = "" + ((c *(9.0 / 5.0 )) + 32); } catch (FormatException) { fahre.Text = ""; cel.Text = ""; } } else { fahre.Text = ""; } } } }

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• j_security_check to SSO in different module under Oracle App Server?

  - by thebearinboulder

  I have an existing j2ee application running on Oracle App Server. It is targeted towards paying customers so the content is secured and a SSO module properly intercepts all requests for secured content. Now the company is adding a unbranded public-facing module with a number of unsecured pages. At one point the user is expected to register for a free account and log in to proceed further. Think doctors adding a public-facing site with information for potential patients, or lawyers adding a public-facing site with information for potential clients. There's some information on the session and the usual approach would be to authenticate the user, persist the session information using the now-known user id, invalidate the existing session (to prevent certain types of attacks), the reload the session information before returning to the user. I can't just persist it under the session id since that's about to change. The glitch is that the existing application already has an SSO module and I get a 404 error every time I try to direct to j_security_check. I've tried that, /sso/j_security_check, even http://localhost/sso/j_security_check, all without success. I noticed that an earlier question said that tomcat requires access to a secured page before j_security_check is even visible. I don't know if that's the case with Oracle AS. Ideas? Or is the best approach to continue arguing that we have a different user base so it would be better to handle authentication in our own module anyway?

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• Where to start with the development of first database driven Web App (long question)?

  - by Ryan

  Hi all, I've decided to develop a database driven web app, but I'm not sure where to start. The end goal of the project is three-fold: 1) to learn new technologies and practices, 2) deliver an unsolicited demo to management that would show how information that the company stores as office documents spread across a cumbersome network folder structure can be consolidated and made easier to access and maintain and 3) show my co-workers how Test Drive Development and prototyping via class diagrams can be very useful and reduces future maintenance headaches. I think this ends up being a basic CMS to which I have generated a set of features, see below. 1) Create a database to store the site structure (organized as a tree with a 'project group'-project structure). 2) Pull the site structure from the database and display as a tree using basic front end technologies. 3) Add administrator privileges/tools for modifying the site structure. 4) Auto create required sub pages* when an admin adds a new project. 4.1) There will be several sub pages under each project and the content for each sub page is different. 5) add user privileges for assigning read and write privileges to sub pages. What I would like to do is use Test Driven Development and class diagramming as part of my process for developing this project. My problem; I'm not sure where to start. I have read on Unit Testing and UML, but never used them in practice. Also, having never worked with databases before, how to I incorporate these items into the models and test units? Thank you all in advance for your expertise.

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• For a 1view/scene to 2view/scene app, what application should I choose in Xcode?

  - by Tony Xu

  The question may be simple to some others, but I have been struggling with this for a while. The app I want would be like this: first scene/view with two big buttons (no toolbar item), click each one to get into two new scenes. So totally three scenes. In Xcode, what application should I choose? And in storyboard how/should I drag/draw? Thanks. Update: thanks for the link, the big-number-user. I actually read that tutorial before I asked. A little update on what I got so far: 1, I selected "single view", so there's view controller 1 (VC1) in the storyboard. 2, dragged a navigation controller (NC), and move the initial view arrow pointing to NC 3, control-drag to link NC and VC1, selected "relationship segue root view controller" when some small dialog popup. IS THIS CORRECT? 4, created two additional VC, VC3 and VC4, control-drag link each to NC. selected "push", IS THIS CORRECT? 5, in VC1, I added two buttons, showVC3 and showVC4. NOW I DON'T KNOW how to add IBAction to button showVC3 and showVC4. I tried to control-drag it to ViewController.m file @interface and @end section, but failed. What should I do next?

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• Rails - Beginner wants feedback on how they've modeled their app and how to do it better.

  - by adam

  I think the way I've modelled my app is a bit fishy and i need to rejig things, im just not sure how. I've already re-jigged and refactored before. It took a long time ( I'm a beginner ) and I'm hesitant to it again in case i head off in the wrong direction again. Basic Idea, user can submit an answer, another user can mark it correct or incorrect. If incorrect they have to write the correct answer. Users can view their and everybody else's correct and incorrect answers. So I did it this way class Answer has_one: correction end class Correction belongs_to :answer end when a user marks an answer as correct, I set checked_at:DateTime and checked_by_id:integer on the Answer object to keep track of who checked the answer and when. For incorrect answers I create a correction object which holds the correct answer and again checked_by and checked_at details. I don't like this because I have checked_by and checked_at in both models. It just doesn't sit right. Possible solutions are: Create a third model such as VerifiedAnswer and move the checked_by/at attributes to that. It will handle the situtation where an answer is marked correct. Or are these models thin enough (they dont have any other attributes) that I can just have one model ( Answer ) that has all the attributes to store all this information?

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• Utility App with Navigation Controller and Table View on FlipSide.

  - by wdt

  Hi All. I am relatively new to the whole MVC way of looking at things. I have an application that is based on the "Utility" Application template. Everything in the MainView and FlipsideView is working great but now I need to add a TableView and Navigation Controller to the flipside. Without the navigation bar being on the MainView. So only once the user has tapped the info light button will the nav bar display on the flipside with a table view. I have been able to impliment the Table View on the side and populate it with data from an array. I am now struggling to link in a navigation controller so that the tableview can become interactive. When I place the nav bar code into the app delegate it appears on the MainView and not the flipside view. Where do I place the navigation bar code so that it will display on the flipsideview. I cannt seem to get the code in the right place. Also I am not sure I have the right code, do I put the UINavigationController code in the FlipSideViewController.m ? I am not grasping the concept of the naivgation controller fully I think . . . Here is the code to bring up the FlipView - (IBAction)showInfo { TableViewController *controller = [[TableViewController alloc] initWithNibName:@"TableViewController" bundle:nil]; controller.delegate = self; controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; [self presentModalViewController:controller animated:YES]; [controller release]; } Now I need to get the TableViewController to have a navigation controller and a table view Thanks in advance.

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• How to use iPhone OS 3.2 functionality in an iPhone OS 3.0 app?

  - by mystify

  Problem: My app must run on iPhone OS 3.0. However, there are some features of iPhone OS 3.2 which I really want to use. Just as a little add-on for free. But I don't want to cut off my user base by doing this. Imagine you're an iPhone OS 3.0 thing, and someone gives you a book to read. It has iPhone OS 3.2 instructions. You never learned those. So what do you do? Crash? They would have to be hidden, so you're not bothered. Someone wrote recently on SO: keep in mind that you have to check the version at places in the source code where you like to use the new features and provide alternatives for older os versions So how could I do that? Wouldn't Xcode throw warnings when it finds stuff that isn't linkable from anything anywhere? Would I just check for the OS version and dynamically link - somehow - to whatever stuff I think is cool?

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• Windows Server 2008 Task Scheduler Tasks Not Executing

  - by omatase

  I've been having an intermittent problem for some time now with the Windows Task Scheduler that I can't work out. I use the task scheduler to run a C# app I've written that has various plugins used to ensure production systems are working. This task scheduler itself is actually a production system so I have one simple task that executes every 8 minutes to notify an external monitoring system that the task scheduler is still up. If this external service fails to receive an "all-clear" at least once every 15 minutes (or so I don't remember the exact number right now) it will message us that the monitoring system is down. In the past we've had intermittent "down" messages from time to time and each time I've investigated the cause I was unable to find any problems. So this time I wanted to ask the StackOverflow community since it doesn't look like I'll have luck on my own. This morning at 2:32 AM the task fired (exactly 8 minutes after the previous firing) however the task didn't fire again until 3:28. There are no errors that I can see in the Event Viewer at this time. When I look at the Task Scheduler log there are no errors there either. Here is what the log looks like though: Information 6/11/2011 3:28:56 AM 102 Task completed (2) d6cf2412-269e-48bf-9f40-4a863347baad Information 6/11/2011 3:28:56 AM 201 Action completed (2) d6cf2412-269e-48bf-9f40-4a863347baad Information 6/11/2011 3:28:55 AM 129 Created Task Process Info Information 6/11/2011 3:28:55 AM 200 Action started (1) d6cf2412-269e-48bf-9f40-4a863347baad Information 6/11/2011 3:28:55 AM 100 Task Started (1) d6cf2412-269e-48bf-9f40-4a863347baad Information 6/11/2011 3:28:55 AM 319 Task Engine received message to start task (1) Information 6/11/2011 3:28:55 AM 107 Task triggered on scheduler Info d6cf2412-269e-48bf-9f40-4a863347baad Information 6/11/2011 3:28:15 AM 102 Task completed (2) b91fe5ce-39ef-42fb-adbe-bd8be012c00a Information 6/11/2011 3:28:15 AM 201 Action completed (2) b91fe5ce-39ef-42fb-adbe-bd8be012c00a Information 6/11/2011 3:28:15 AM 102 Task completed (2) 556c07dc-2724-4a21-a97e-dc4abd56f94d Information 6/11/2011 3:28:15 AM 201 Action completed (2) 556c07dc-2724-4a21-a97e-dc4abd56f94d Information 6/11/2011 3:28:15 AM 102 Task completed (2) 79328289-f742-49dd-aa0d-c3d05db50895 Information 6/11/2011 3:28:15 AM 201 Action completed (2) 79328289-f742-49dd-aa0d-c3d05db50895 Information 6/11/2011 3:28:15 AM 102 Task completed (2) 19743755-47b6-4b98-9bec-052193be9496 Information 6/11/2011 3:28:15 AM 201 Action completed (2) 19743755-47b6-4b98-9bec-052193be9496 Information 6/11/2011 3:28:15 AM 102 Task completed (2) c165754f-e3e6-4176-a327-11f9c06c39a5 Information 6/11/2011 3:28:15 AM 201 Action completed (2) c165754f-e3e6-4176-a327-11f9c06c39a5 Information 6/11/2011 3:28:15 AM 102 Task completed (2) 0e62ad3e-1f6e-40c0-9155-19f0108dee22 Information 6/11/2011 3:28:15 AM 201 Action completed (2) 0e62ad3e-1f6e-40c0-9155-19f0108dee22 Information 6/11/2011 3:28:10 AM 129 Created Task Process Info Information 6/11/2011 3:28:10 AM 200 Action started (1) 0e62ad3e-1f6e-40c0-9155-19f0108dee22 Information 6/11/2011 3:28:10 AM 129 Created Task Process Info Information 6/11/2011 3:28:10 AM 200 Action started (1) c165754f-e3e6-4176-a327-11f9c06c39a5 Information 6/11/2011 3:28:10 AM 129 Created Task Process Info Information 6/11/2011 3:28:10 AM 200 Action started (1) 19743755-47b6-4b98-9bec-052193be9496 Information 6/11/2011 3:28:10 AM 129 Created Task Process Info Information 6/11/2011 3:28:10 AM 200 Action started (1) 79328289-f742-49dd-aa0d-c3d05db50895 Information 6/11/2011 3:28:10 AM 129 Created Task Process Info Information 6/11/2011 3:28:10 AM 200 Action started (1) 556c07dc-2724-4a21-a97e-dc4abd56f94d Information 6/11/2011 3:28:10 AM 129 Created Task Process Info Information 6/11/2011 3:28:10 AM 200 Action started (1) b91fe5ce-39ef-42fb-adbe-bd8be012c00a Information 6/11/2011 3:28:10 AM 100 Task Started (1) 0e62ad3e-1f6e-40c0-9155-19f0108dee22 Information 6/11/2011 3:28:10 AM 319 Task Engine received message to start task (1) Information 6/11/2011 3:28:10 AM 100 Task Started (1) c165754f-e3e6-4176-a327-11f9c06c39a5 Information 6/11/2011 3:28:10 AM 319 Task Engine received message to start task (1) Information 6/11/2011 3:28:10 AM 100 Task Started (1) 19743755-47b6-4b98-9bec-052193be9496 Information 6/11/2011 3:28:10 AM 319 Task Engine received message to start task (1) Information 6/11/2011 3:28:10 AM 100 Task Started (1) 79328289-f742-49dd-aa0d-c3d05db50895 Information 6/11/2011 3:28:10 AM 319 Task Engine received message to start task (1) Information 6/11/2011 3:28:10 AM 100 Task Started (1) 556c07dc-2724-4a21-a97e-dc4abd56f94d Information 6/11/2011 3:28:10 AM 319 Task Engine received message to start task (1) Information 6/11/2011 3:28:10 AM 100 Task Started (1) b91fe5ce-39ef-42fb-adbe-bd8be012c00a Information 6/11/2011 3:28:10 AM 319 Task Engine received message to start task (1) Information 6/11/2011 3:28:10 AM 107 Task triggered on scheduler Info 0e62ad3e-1f6e-40c0-9155-19f0108dee22 Information 6/11/2011 3:28:10 AM 107 Task triggered on scheduler Info c165754f-e3e6-4176-a327-11f9c06c39a5 Information 6/11/2011 3:28:10 AM 107 Task triggered on scheduler Info 19743755-47b6-4b98-9bec-052193be9496 Information 6/11/2011 3:28:10 AM 107 Task triggered on scheduler Info 79328289-f742-49dd-aa0d-c3d05db50895 Information 6/11/2011 3:28:10 AM 107 Task triggered on scheduler Info 556c07dc-2724-4a21-a97e-dc4abd56f94d Information 6/11/2011 3:28:10 AM 107 Task triggered on scheduler Info b91fe5ce-39ef-42fb-adbe-bd8be012c00a Information 6/11/2011 2:32:56 AM 102 Task completed (2) 16e4f2c3-a340-410a-9c14-4bfe0861fdd5 Information 6/11/2011 2:32:56 AM 201 Action completed (2) 16e4f2c3-a340-410a-9c14-4bfe0861fdd5 Information 6/11/2011 2:32:55 AM 129 Created Task Process Info Information 6/11/2011 2:32:55 AM 200 Action started (1) 16e4f2c3-a340-410a-9c14-4bfe0861fdd5 Information 6/11/2011 2:32:55 AM 100 Task Started (1) 16e4f2c3-a340-410a-9c14-4bfe0861fdd5 Information 6/11/2011 2:32:55 AM 319 Task Engine received message to start task (1) Information 6/11/2011 2:32:55 AM 107 Task triggered on scheduler Info 16e4f2c3-a340-410a-9c14-4bfe0861fdd5 Seems kind of strange. I also have two other C# apps that run and check something each hour on the hour using task scheduler. If I look at the history for those I can see that they didn't execute at 3 AM either! They all waited until 3:28 to start as well. If I look at "tasks completed" in the Event Viewer it shows that only one task was able to run between the 2:32 AM to 3:28 AM time period. The task was "\Microsoft\Windows\RAC\RACAgent" And here's what it looked like: Information 6/11/2011 3:18:09 AM 102 Task completed (2) 00c53a85-ba20-4666-80db-fbbe2492c0ad Information 6/11/2011 3:18:09 AM 201 Action completed (2) 00c53a85-ba20-4666-80db-fbbe2492c0ad Information 6/11/2011 3:18:08 AM 129 Created Task Process Info Information 6/11/2011 3:18:08 AM 200 Action started (1) 00c53a85-ba20-4666-80db-fbbe2492c0ad Information 6/11/2011 3:18:08 AM 100 Task Started (1) 00c53a85-ba20-4666-80db-fbbe2492c0ad Information 6/11/2011 3:18:08 AM 319 Task Engine received message to start task (1) I appreciate any ideas anyone may have.

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• qwebview in pyside after packaged with pyinstaller goes wrong

  - by truease.com

  Here's my code import sys from PySide.QtCore import * from PySide.QtGui import * from PySide.QtWebKit import * from encodings import * from codecs import * class BrowserWindow( QWidget ): def __init__( self, parent=None ): QWidget.__init__( self, parent ) self.Setup() self.SetupEvent() def Setup( self ): self.setWindowTitle( u"Truease Speedy Browser" ) self.addr_input = QLineEdit() self.addr_go = QPushButton( "GO" ) self.addr_bar = QHBoxLayout() self.addr_bar.addWidget( self.addr_input ) self.addr_bar.addWidget( self.addr_go ) for attr in [ QWebSettings.AutoLoadImages, QWebSettings.JavascriptEnabled, QWebSettings.JavaEnabled, QWebSettings.PluginsEnabled, QWebSettings.JavascriptCanOpenWindows, QWebSettings.JavascriptCanAccessClipboard, QWebSettings.DeveloperExtrasEnabled, QWebSettings.SpatialNavigationEnabled, QWebSettings.OfflineStorageDatabaseEnabled, QWebSettings.OfflineWebApplicationCacheEnabled, QWebSettings.LocalStorageEnabled, QWebSettings.LocalStorageDatabaseEnabled, QWebSettings.LocalContentCanAccessRemoteUrls, QWebSettings.LocalContentCanAccessFileUrls, ]: QWebSettings.globalSettings().setAttribute( attr, True ) self.web_view = QWebView() self.web_view.load( "http://www.baidu.com" ) layout = QVBoxLayout() layout.addLayout( self.addr_bar ) layout.addWidget( self.web_view ) self.setLayout( layout ) def SetupEvent( self ): self.connect( self.addr_input, SIGNAL("editingFinished()"), self, SLOT("Load()"), ) self.connect( self.addr_go, SIGNAL("pressed()"), self, SLOT("Load()") ) self.connect( self.web_view, SIGNAL("urlChanged(const QUrl&)"), self, SLOT("SetURL()"), ) def Load( self, *args, **kwargs ): url = self.GetCleanedURL() if url != self.CurrentURL(): self.web_view.load( url ) def SetURL( self, *args, **kwargs ): self.addr_input.setText( self.CurrentURL() ) def GetCleanedURL( self ): url = self.addr_input.text().strip() if not url.startswith("http"): url = "http://" + url return url def CurrentURL( self ): url = self.web_view.url().toString() return url def Main(): app = QApplication( sys.argv ) widget = BrowserWindow() widget.show() return app.exec_() if __name__ == '__main__': sys.exit( Main() ) I works well when i using python browser.py. but it goes wrong after packaged with pyinstaller -w browser.py. it doesn't load images can only display correct text in utf-8 And this is the pyinstaller output: E:\true\wuk\app2>pyinstaller -w b.py 16 INFO: wrote E:\true\wuk\app2\b.spec 16 INFO: Testing for ability to set icons, version resources... 32 INFO: ... resource update available 32 INFO: UPX is not available. 46 INFO: Processing hook hook-os 141 INFO: Processing hook hook-time 157 INFO: Processing hook hook-cPickle 218 INFO: Processing hook hook-_sre 312 INFO: Processing hook hook-cStringIO 407 INFO: Processing hook hook-encodings 421 INFO: Processing hook hook-codecs 750 INFO: Processing hook hook-httplib 750 INFO: Processing hook hook-email 843 INFO: Processing hook hook-email.message 1046 WARNING: library python%s%s required via ctypes not found 1171 INFO: Extending PYTHONPATH with E:\true\wuk\app2 1171 INFO: checking Analysis 1171 INFO: building because b.py changed 1171 INFO: running Analysis out00-Analysis.toc 1171 INFO: Adding Microsoft.VC90.CRT to dependent assemblies of final executable 1171 INFO: Searching for assembly x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww ... 1171 INFO: Found manifest C:\WINDOWS\WinSxS\Manifests\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375.manifest 1187 INFO: Searching for file msvcr90.dll 1187 INFO: Found file C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375\msvcr90.dll 1187 INFO: Searching for file msvcp90.dll 1187 INFO: Found file C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375\msvcp90.dll 1187 INFO: Searching for file msvcm90.dll 1187 INFO: Found file C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375\msvcm90.dll 1266 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\_pyi_bootstrap.py 1266 INFO: Processing hook hook-os 1282 INFO: Processing hook hook-site 1296 INFO: Processing hook hook-encodings 1391 INFO: Processing hook hook-time 1407 INFO: Processing hook hook-cPickle 1468 INFO: Processing hook hook-_sre 1578 INFO: Processing hook hook-cStringIO 1671 INFO: Processing hook hook-codecs 2016 INFO: Processing hook hook-httplib 2016 INFO: Processing hook hook-email 2109 INFO: Processing hook hook-email.message 2312 WARNING: library python%s%s required via ctypes not found 2468 INFO: Processing hook hook-pydoc 2516 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\pyi_importers.py 2609 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\pyi_archive.py 2687 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\pyi_carchive.py 2782 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\pyi_os_path.py 2782 INFO: Analyzing b.py 2796 INFO: Processing hook hook-PySide 2875 INFO: Hidden import 'codecs' has been found otherwise 2875 INFO: Hidden import 'encodings' has been found otherwise 2875 INFO: Looking for run-time hooks 7766 INFO: Using Python library C:\WINDOWS\system32\python27.dll 7796 INFO: E:\true\wuk\app2\build\b\out00-Analysis.toc no change! 7796 INFO: checking PYZ 7812 INFO: checking PKG 7812 INFO: building because E:\true\wuk\app2\build\b\b.exe.manifest changed 7812 INFO: building PKG (CArchive) out00-PKG.pkg 7828 INFO: checking EXE 7843 INFO: rebuilding out00-EXE.toc because pkg is more recent 7843 INFO: building EXE from out00-EXE.toc 7843 INFO: Appending archive to EXE E:\true\wuk\app2\build\b\b.exe 7843 INFO: checking COLLECT 7843 INFO: building COLLECT out00-COLLECT.toc Use pyinstaller browser.py, and in the console window i got QFont::setPixelSize: Pixel size <= 0 (0) QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_CTX_new QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function ERR_get_error QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_CTX_new QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function ERR_get_error QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_CTX_new QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function ERR_get_error QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_CTX_new QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function ERR_get_error QFont::setPixelSize: Pixel size <= 0 (0)

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• Applet Loading Error - Jasper Report

  - by Mihir

  I encountered very silly error , but any way i can not figure out solution.i am loading java applet which encompass a simple jasper viewer in it. when the applet is loaded it throws following exception. SEVERE: Servlet.service() for servlet JasperReportServlet threw exception java.lang.ClassNotFoundException: org.apache.commons.collections.ReferenceMap at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at net.sf.jasperreports.extensions.DefaultExtensionsRegistry.<init>(DefaultExtensionsRegistry.java:96) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at java.lang.Class.newInstance0(Class.java:355) at java.lang.Class.newInstance(Class.java:308) at net.sf.jasperreports.engine.util.ClassUtils.instantiateClass(ClassUtils.java:59) at net.sf.jasperreports.extensions.ExtensionsEnvironment.createDefaultRegistry(ExtensionsEnvironment.java:80) at net.sf.jasperreports.extensions.ExtensionsEnvironment.<clinit>(ExtensionsEnvironment.java:68) at net.sf.jasperreports.engine.util.JRStyledTextParser.<clinit>(JRStyledTextParser.java:76) at net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:182) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:77) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:87) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:57) at net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:142) at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:78) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:624) at com.dbhl.app.report.generator.JobUpdateGenerator.getJasperPrintObject(JobUpdateGenerator.java:279) at com.dbhl.app.report.JasperReportServlet.processJobUpdate(JasperReportServlet.java:153) at com.dbhl.app.report.JasperReportServlet.getJasperPrintObjectByLedgerType(JasperReportServlet.java:79) at com.dbhl.app.report.JasperReportServlet.service(JasperReportServlet.java:50) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:619) below is my applet configuration, i am loading applet using standard java deployment toolkit. <script type="text/javascript" src="<%=basePath%>js/deployJava.js"> </script> <script> var user = '<%=request.getParameter("user")%>'; var attributes = { code : 'applet.EmbeddedViewerApplet.class', archive : '<%=basePath%>resources/appletviewer.jar,<%=basePath%>resources/jasperreports-applet-4.0.0.jar,<%=basePath%>resources/jasperreports-4.0.0.jar,<%=basePath%>resources/commons-collections-3.2.1.jar,<%=basePath%>resources/commons-logging-1.0.4.jar,<%=basePath%>resources/commons-beanutils-1.8.0.jar,<%=basePath%>resources/commons-digester-1.7.jar,<%=basePath%>resources/commons-javaflow-20060411.jar,<%=basePath%>resources/org-netbeans-core.jar', width : "100%", height : 600 }; var parameters = { fontSize : 16, REPORT_URL : '<%=basePath%>servlet/JasperReportServlet?startDate=<%=request.getParameter("startDate")%>&endDate=<%=request.getParameter("endDate")%>&user=' + user + '&reportType=<%=request.getParameter("reportType")%>' }; var version = '1.4'; deployJava.runApplet(attributes, parameters, version); </script> every jar i referred in the applet attributes exist the resource folder of my webroot, which are appletviewer.jar commons-beanutils-1.8.0.jar commons-collections-3.2.1.jar commons-digester-1.7.jar commons-javaflow-20060411.jar commons-logging-1.0.4.jar jasperreports-4.0.0.jar jasperreports-applet-4.0.0.jar org-netbeans-core.jar all the jars are signed today, so no validity expires. i have double check all the things. but it always shows the above error. in iReport i can view the report and it is compiled to jasper object with no error. the java console from control panel http://pastebin.com/Xt6303tT My question is why the classNotFound Exception happens ? i check in the temp cache that the collections file is downloaded succesfully and in the above console log it shows that the jars are successfully downloaded to the host computer. Thank You Mihir Parekh

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• Issue with translating a delegate function from c# to vb.net for use with Google OAuth 2

  - by Jeremy

  I've been trying to translate a Google OAuth 2 example from C# to Vb.net for a co-worker's project. I'm having on end of issues translating the following methods: private OAuth2Authenticator<WebServerClient> CreateAuthenticator() { // Register the authenticator. var provider = new WebServerClient(GoogleAuthenticationServer.Description); provider.ClientIdentifier = ClientCredentials.ClientID; provider.ClientSecret = ClientCredentials.ClientSecret; var authenticator = new OAuth2Authenticator<WebServerClient>(provider, GetAuthorization) { NoCaching = true }; return authenticator; } private IAuthorizationState GetAuthorization(WebServerClient client) { // If this user is already authenticated, then just return the auth state. IAuthorizationState state = AuthState; if (state != null) { return state; } // Check if an authorization request already is in progress. state = client.ProcessUserAuthorization(new HttpRequestInfo(HttpContext.Current.Request)); if (state != null && (!string.IsNullOrEmpty(state.AccessToken) || !string.IsNullOrEmpty(state.RefreshToken))) { // Store and return the credentials. HttpContext.Current.Session["AUTH_STATE"] = _state = state; return state; } // Otherwise do a new authorization request. string scope = TasksService.Scopes.TasksReadonly.GetStringValue(); OutgoingWebResponse response = client.PrepareRequestUserAuthorization(new[] { scope }); response.Send(); // Will throw a ThreadAbortException to prevent sending another response. return null; } The main issue being this line: var authenticator = new OAuth2Authenticator<WebServerClient>(provider, GetAuthorization) { NoCaching = true }; The Method signature reads as for this particular line reads as follows: Public Sub New(tokenProvider As TClient, authProvider As System.Func(Of TClient, DotNetOpenAuth.OAuth2.IAuthorizationState)) My understanding of Delegate functions in VB.net isn't the greatest. However I have read over all of the MSDN documentation and other relevant resources on the web, but I'm still stuck as to how to translate this particular line. So far all of my attempts have resulted in either the a cast error (see below) or no call to GetAuthorization. The Code (vb.net on .net 3.5) Private Function CreateAuthenticator() As OAuth2Authenticator(Of WebServerClient) ' Register the authenticator. Dim client As New WebServerClient(GoogleAuthenticationServer.Description, oauth.ClientID, oauth.ClientSecret) Dim authDelegate As Func(Of WebServerClient, IAuthorizationState) = AddressOf GetAuthorization Dim authenticator = New OAuth2Authenticator(Of WebServerClient)(client, authDelegate) With {.NoCaching = True} 'Dim authenticator = New OAuth2Authenticator(Of WebServerClient)(client, GetAuthorization(client)) With {.NoCaching = True} 'Dim authenticator = New OAuth2Authenticator(Of WebServerClient)(client, New Func(Of WebServerClient, IAuthorizationState)(Function(c) GetAuthorization(c))) With {.NoCaching = True} 'Dim authenticator = New OAuth2Authenticator(Of WebServerClient)(client, New Func(Of WebServerClient, IAuthorizationState)(AddressOf GetAuthorization)) With {.NoCaching = True} Return authenticator End Function Private Function GetAuthorization(arg As WebServerClient) As IAuthorizationState ' If this user is already authenticated, then just return the auth state. Dim state As IAuthorizationState = AuthState If (Not state Is Nothing) Then Return state End If ' Check if an authorization request already is in progress. state = arg.ProcessUserAuthorization(New HttpRequestInfo(HttpContext.Current.Request)) If (state IsNot Nothing) Then If ((String.IsNullOrEmpty(state.AccessToken) = False Or String.IsNullOrEmpty(state.RefreshToken) = False)) Then ' Store Credentials HttpContext.Current.Session("AUTH_STATE") = state _state = state Return state End If End If ' Otherwise do a new authorization request. Dim scope As String = AnalyticsService.Scopes.AnalyticsReadonly.GetStringValue() Dim _response As OutgoingWebResponse = arg.PrepareRequestUserAuthorization(New String() {scope}) ' Add Offline Access and forced Approval _response.Headers("location") += "&access_type=offline&approval_prompt=force" _response.Send() ' Will throw a ThreadAbortException to prevent sending another response. Return Nothing End Function The Cast Error Server Error in '/' Application. Unable to cast object of type 'DotNetOpenAuth.OAuth2.AuthorizationState' to type 'System.Func`2[DotNetOpenAuth.OAuth2.WebServerClient,DotNetOpenAuth.OAuth2.IAuthorizationState]'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidCastException: Unable to cast object of type 'DotNetOpenAuth.OAuth2.AuthorizationState' to type 'System.Func`2[DotNetOpenAuth.OAuth2.WebServerClient,DotNetOpenAuth.OAuth2.IAuthorizationState]'. I've spent the better part of a day on this, and it's starting to drive me nuts. Help is much appreciated.

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• Farseer tutorial for the absolute beginners

  - by Bil Simser

  This post is inspired (and somewhat a direct copy) of a couple of posts Emanuele Feronato wrote back in 2009 about Box2D (his tutorial was ActionScript 3 based for Box2D, this is C# XNA for the Farseer Physics Engine). Here’s what we’re building: What is Farseer The Farseer Physics Engine is a collision detection system with realistic physics responses to help you easily create simple hobby games or complex simulation systems. Farseer was built as a .NET version of Box2D (based on the Box2D.XNA port of Box2D). While the constructs and syntax has changed over the years, the principles remain the same. This tutorial will walk you through exactly what Emanuele create for Flash but we’ll be doing it using C#, XNA and the Windows Phone platform. The first step is to download the library from its home on CodePlex. If you have NuGet installed, you can install the library itself using the NuGet package that but we’ll also be using some code from the Samples source that can only be obtained by downloading the library. Once you download and unpacked the zip file into a folder and open the solution, this is what you will get: The Samples XNA WP7 project (and content) have all the demos for Farseer. There’s a wealth of info here and great examples to look at to learn. The Farseer Physics XNA WP7 project contains the core libraries that do all the work. DebugView XNA contains an XNA-ready class to let you view debug data and information in the game draw loop (which you can copy into your project or build the source and reference the assembly). The downloaded version has to be compiled as it’s only available in source format so you can do that now if you want (open the solution file and rebuild everything). If you’re using the NuGet package you can just install that. We only need the core library and we’ll be copying in some code from the samples later. Your first Farseer experiment Start Visual Studio and create a new project using the Windows Phone template can call it whatever you want. It’s time to edit Game1.cs 1 public class Game1 : Game 2 { 3 private readonly GraphicsDeviceManager _graphics; 4 private DebugViewXNA _debugView; 5 private Body _floor; 6 private SpriteBatch _spriteBatch; 7 private float _timer; 8 private World _world; 9 10 public Game1() 11 { 12 _graphics = new GraphicsDeviceManager(this) 13 { 14 PreferredBackBufferHeight = 800, 15 PreferredBackBufferWidth = 480, 16 IsFullScreen = true 17 }; 18 19 Content.RootDirectory = "Content"; 20 21 // Frame rate is 30 fps by default for Windows Phone. 22 TargetElapsedTime = TimeSpan.FromTicks(333333); 23 24 // Extend battery life under lock. 25 InactiveSleepTime = TimeSpan.FromSeconds(1); 26 } 27 28 protected override void LoadContent() 29 { 30 // Create a new SpriteBatch, which can be used to draw textures. 31 _spriteBatch = new SpriteBatch(_graphics.GraphicsDevice); 32 33 // Load our font (DebugViewXNA needs it for the DebugPanel) 34 Content.Load<SpriteFont>("font"); 35 36 // Create our World with a gravity of 10 vertical units 37 if (_world == null) 38 { 39 _world = new World(Vector2.UnitY*10); 40 } 41 else 42 { 43 _world.Clear(); 44 } 45 46 if (_debugView == null) 47 { 48 _debugView = new DebugViewXNA(_world); 49 50 // default is shape, controller, joints 51 // we just want shapes to display 52 _debugView.RemoveFlags(DebugViewFlags.Controllers); 53 _debugView.RemoveFlags(DebugViewFlags.Joint); 54 55 _debugView.LoadContent(GraphicsDevice, Content); 56 } 57 58 // Create and position our floor 59 _floor = BodyFactory.CreateRectangle( 60 _world, 61 ConvertUnits.ToSimUnits(480), 62 ConvertUnits.ToSimUnits(50), 63 10f); 64 _floor.Position = ConvertUnits.ToSimUnits(240, 775); 65 _floor.IsStatic = true; 66 _floor.Restitution = 0.2f; 67 _floor.Friction = 0.2f; 68 } 69 70 protected override void Update(GameTime gameTime) 71 { 72 // Allows the game to exit 73 if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) 74 Exit(); 75 76 // Create a random box every second 77 _timer += (float) gameTime.ElapsedGameTime.TotalSeconds; 78 if (_timer >= 1.0f) 79 { 80 // Reset our timer 81 _timer = 0f; 82 83 // Determine a random size for each box 84 var random = new Random(); 85 var width = random.Next(20, 100); 86 var height = random.Next(20, 100); 87 88 // Create it and store the size in the user data 89 var box = BodyFactory.CreateRectangle( 90 _world, 91 ConvertUnits.ToSimUnits(width), 92 ConvertUnits.ToSimUnits(height), 93 10f, 94 new Point(width, height)); 95 96 box.BodyType = BodyType.Dynamic; 97 box.Restitution = 0.2f; 98 box.Friction = 0.2f; 99 100 // Randomly pick a location along the top to drop it from 101 box.Position = ConvertUnits.ToSimUnits(random.Next(50, 400), 0); 102 } 103 104 // Advance all the elements in the world 105 _world.Step(Math.Min((float) gameTime.ElapsedGameTime.TotalMilliseconds*0.001f, (1f/30f))); 106 107 // Clean up any boxes that have fallen offscreen 108 foreach (var box in from box in _world.BodyList 109 let pos = ConvertUnits.ToDisplayUnits(box.Position) 110 where pos.Y > _graphics.GraphicsDevice.Viewport.Height 111 select box) 112 { 113 _world.RemoveBody(box); 114 } 115 116 base.Update(gameTime); 117 } 118 119 protected override void Draw(GameTime gameTime) 120 { 121 GraphicsDevice.Clear(Color.FromNonPremultiplied(51, 51, 51, 255)); 122 123 _spriteBatch.Begin(); 124 125 var projection = Matrix.CreateOrthographicOffCenter( 126 0f, 127 ConvertUnits.ToSimUnits(_graphics.GraphicsDevice.Viewport.Width), 128 ConvertUnits.ToSimUnits(_graphics.GraphicsDevice.Viewport.Height), 0f, 0f, 129 1f); 130 _debugView.RenderDebugData(ref projection); 131 132 _spriteBatch.End(); 133 134 base.Draw(gameTime); 135 } 136 } 137 Lines 4: Declare the debug view we’ll use for rendering (more on that later). Lines 8: Declare _world variable of type class World. World is the main object to interact with the Farseer engine. It stores all the joints and bodies, and is responsible for stepping through the simulation. Lines 12-17: Create the graphics device we’ll be rendering on. This is an XNA component and we’re just setting it to be the same size as the phone and toggling it to be full screen (no system tray). Lines 34: We create a SpriteFont here by adding it to the project. It’s called “font” because that’s what the DebugView uses but you can name it whatever you want (and if you’re not using DebugView for your production app you might have several fonts). Lines 37-44: We create the physics environment that Farseer uses to contain all the objects by specifying it here. We’re using Vector2.UnitY*10 to represent the gravity to be used in the environment. In other words, 10 units going in a downward motion. Lines 46-56: We create the DebugViewXNA here. This is copied from the […] from the code you downloaded and provides the ability to render all entities onto the screen. In a production release you’ll be doing the rendering yourself of each object but we cheat a bit for the demo and let the DebugView do it for us. The other thing it can provide is to render out a panel of debugging information while the simulation is going on. This is useful in tracking down objects, figuring out how something works, or just keeping track of what’s in the engine. Lines 49-67: Here we create a rigid body (Farseer only supports rigid bodies) to represent the floor that we’ll drop objects onto. We create it by using one of the Farseer factories and specifying the width and height. The ConvertUnits class is copied from the samples code as-is and lets us toggle between display units (pixels) and simulation units (usually metres). We’re creating a floor that’s 480 pixels wide and 50 pixels high (converting them to SimUnits for the engine to understand). We also position it near the bottom of the screen. Values are in metres and when specifying values they refer to the centre of the body object. Lines 77-78: The game Update method fires 30 times a second, too fast to be creating objects this quickly. So we use a variable to track the elapsed seconds since the last update, accumulate that value, then create a new box to drop when 1 second has passed. Lines 89-94: We create a box the same way we created our floor (coming up with a random width and height for the box). Lines 96-101: We set the box to be Dynamic (rather than Static like the floor object) and position it somewhere along the top of the screen. And now you created the world. Gravity does the rest and the boxes fall to the ground. Here’s the result: Farseer Physics Engine Demo using XNA Lines 105: We must update the world at every frame. We do this with the Step method which takes in the time interval. [more] Lines 108-114: Body objects are added to the world but never automatically removed (because Farseer doesn’t know about the display world, it has no idea if an item is on the screen or not). Here we just loop through all the entities and anything that’s dropped off the screen (below the bottom) gets removed from the World. This keeps our entity count down (the simulation never has more than 30 or 40 objects in the world no matter how long you run it for). Too many entities and the app will grind to a halt. Lines 125-130: Farseer knows nothing about the UI so that’s entirely up to you as to how to draw things. Farseer is just tracking the objects and moving them around using the physics engine and it’s rules. You’ll still use XNA to draw items (using the SpriteBatch.Draw method) so you can load up your usual textures and draw items and pirates and dancing zombies all over the screen. Instead in this demo we’re going to cheat a little. In the sample code for Farseer you can download there’s a project called DebugView XNA. This project contains the DebugViewXNA class which just handles iterating through all the bodies in the world and drawing the shapes. So we call the RenderDebugData method here of that class to draw everything correctly. In the case of this demo, we just want to draw Shapes so take a look at the source code for the DebugViewXNA class as to how it extracts all the vertices for the shapes created (in this case simple boxes) and draws them. You’ll learn a *lot* about how Farseer works just by looking at this class. That’s it, that’s all. Simple huh? Hope you enjoy the code and library. Physics is hard and requires some math skills to really grok. The Farseer Physics Engine makes it pretty easy to get up and running and start building games. In future posts we’ll get more in-depth with things you can do with the engine so this is just the beginning. Enjoy!

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• How should Application.Run() be called for the main presenter of a MVP WinForms app?

  - by Mr Roys

  I'm learning to apply MVP to a simple WinForms app (only one form) in C# and encountered an issue while creating the main presenter in static void Main(). Is it a good idea to expose a View from the Presenter in order to supply it as a parameter to Application.Run()? Currently, I've implemented an approach which allows me to not expose the View as a property of Presenter: static void Main() { IView view = new View(); Model model = new Model(); Presenter presenter = new Presenter(view, model); presenter.Start(); Application.Run(); } The Start and Stop methods in Presenter: public void Start() { view.Start(); } public void Stop() { view.Stop(); } The Start and Stop methods in View (a Windows Form): public void Start() { this.Show(); } public void Stop() { // only way to close a message loop called // via Application.Run(); without a Form parameter Application.Exit(); } The Application.Exit() call seems like an inelegant way to close the Form (and the application). The other alternative would be to expose the View as a public property of the Presenter in order to call Application.Run() with a Form parameter. static void Main() { IView view = new View(); Model model = new Model(); Presenter presenter = new Presenter(view, model); Application.Run(presenter.View); } The Start and Stop methods in Presenter remain the same. An additional property is added to return the View as a Form: public void Start() { view.Start(); } public void Stop() { view.Stop(); } // New property to return view as a Form for Application.Run(Form form); public System.Windows.Form View { get { return view as Form(); } } The Start and Stop methods in View (a Windows Form) would then be written as below: public void Start() { this.Show(); } public void Stop() { this.Close(); } Could anyone suggest which is the better approach and why? Or there even better ways to resolve this issue?

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• In Rails, how should I implement a Status field for a Tasks app - integer or enum?

  - by Doug

  For a Rails 3.0 Todo app, I have a Tasks model with a Status field. What's the best way to store the Status field data (field type) and still display a human-readable version in a view (HTML table)? Status can be: 0 = Normal 1 = Active 2 = Completed Right now I have this: Rails Schema Here: create_table "tasks", :force = true do |t| t.integer "status", :limit = 1, :default = 0, :null = false Rails Model Here: class Task < ActiveRecord::Base validates_inclusion_of :status, :in => 0..2, :message => "{{value}} must be 0, 1, or 2" Rails View Here: <h1>Listing tasks</h1> <table> <tr> <th>Status</th> <th>Name</th> <th></th> <th></th> <th></th> </tr> <% @tasks.each do |task| %> <tr> <td><%= task.status %></td> <td><%= task.name %></td> <td><%= link_to 'Show', task %></td> <td><%= link_to 'Edit', edit_task_path(task) %></td> <td><%= link_to 'Delete', task, :confirm => 'Are you sure?', :method => :delete %></td> </tr> <% end %> </table> Requirements Store a Task's status in the db such that the values are easily localizable, i.e. I'm not sure I want to store "normal", "active", "completed" as a string field. Solution must work with Rails 3.0. Questions: Should I store the field as an integer (see above)? If so, how do I display the correct human readable status in an HTML table in my Rails view, e.g. show "Active" instead of "1" in the HTML table. Should I use an enum? If so, is this easy to localize later? Should I use straight strings, e.g. "Normal", "Active", "Completed" Can you provide a quick code sample of the view helper, controller or view code to make this work?

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• ASP.NET MVC 4/Web API Single Page App for Mobile Devices ... Needs Authentication

  - by lmttag

  We have developed an ASP.NET MVC 4/Web API single page, mobile website (also using jQuery Mobile) that is intended to be accessed only from mobile devices (e.g., iPads, iPhones, Android tables and phones, etc.), not desktop browsers. This mobile website will be hosted internally, like an intranet site. However, since we’re accessing it from mobile devices, we can’t use Windows authentication. We still need to know which user (and their role) is logging in to the mobile website app. We tried simply using ASP.NET’s forms authentication and membership provider, but couldn’t get it working exactly the way we wanted. What we need is for the user to be prompted for a user name and password only on the first time they access the site on their mobile device. After they enter a correct user name and password and have been authenticated once, each subsequent time they access the site they should just go right in. They shouldn’t have to re-enter their credentials (i.e., something needs to be saved locally to each device to identify the user after the first time). This is where we had troubles. Everything worked as expected the first time. That is, the user was prompted to enter a user name and password, and, after doing that, was authenticated and allowed into the site. The problem is every time after the browser was closed on the mobile device, the device and user were not know and the user had to re-enter user name and password. We tried lots of things too. We tried setting persistent cookies in JavaScript. No good. The cookies weren’t there to be read the second time. We tried manually setting persistent cookies from ASP.NET. No good. We, of course, used FormsAuthentication.SetAuthCookie(model.UserName, true); as part of the form authentication framework. No good. We tried using HTML5 local storage. No good. No matter what we tried, if the user was on a mobile device, they would have to log in every single time. (Note: we’ve tried on an iPad and iPhone running both iOS 5.1 and 6.0, with Safari configure to allow cookies, and we’ve tried on Android 2.3.4.) Is there some trick to getting a scenario like this working? Or, do we have to write some sort of custom authentication mechanism? If so, how? And, what? Or, should we use something like claims-based authentication and WIF? Or??? Any help is appreciated. Thanks!

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• How should Application.Run() be called for the main presenter a MVP WinForms app?

  - by Mr Roys

  I'm learning to apply MVP to a simple WinForms app (only one form) in C# and encountered an issue while creating the main presenter in static void Main(). Is it a good idea to expose a View from the Presenter in order to supply it as a parameter to Application.Run()? Currently, I've implemented an approach which allows me to not expose the View as a property of Presenter: static void Main() { IView view = new View(); Model model = new Model(); Presenter presenter = new Presenter(view, model); presenter.Start(); Application.Run(); } The Start and Stop methods in Presenter: public void Start() { view.Start(); } public void Stop() { view.Stop(); } The Start and Stop methods in View (a Windows Form): public void Start() { this.Show(); } public void Stop() { // only way to close a message loop called // via Application.Run(); without a Form parameter Application.Exit(); } The Application.Exit() call seems like an inelegant way to close the Form (and the application). The other alternative would be to expose the View as a public property of the Presenter in order to call Application.Run() with a Form parameter. static void Main() { IView view = new View(); Model model = new Model(); Presenter presenter = new Presenter(view, model); Application.Run(presenter.View); } The Start and Stop methods in Presenter remain the same. An additional property is added to return the View as a Form: public void Start() { view.Start(); } public void Stop() { view.Stop(); } // New property to return view as a Form for Application.Run(Form form); public System.Windows.Form View { get { return view as Form(); } } The Start and Stop methods in View (a Windows Form) would then be written as below: public void Start() { this.Show(); } public void Stop() { this.Close(); } Could anyone suggest which is the better approach and why? Or there even better ways to resolve this issue?

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• How to setup Lucene/Solr for a B2B web app?

  - by Bill Paetzke

  Given: 1 database per client (business customer) 5000 clients Clients have between 2 to 2000 users (avg is ~100 users/client) 100k to 10 million records per database Users need to search those records often (it's the best way to navigate their data) Possibly relevant info: Several new clients each week (any time during business hours) Multiple web servers and database servers (users can login via any web server) Let's stay agnostic of language or sql brand, since Lucene (and Solr) have a breadth of support For Example: Joel Spolsky said in Podcast #11 that his hosted web app product, FogBugz On-Demand, uses Lucene. He has thousands of on-demand clients. And each client gets their own database. They use an index per client and store it in the client's database. I'm not sure on the details. And I'm not sure if this is a serious mod to Lucene. The Question: How would you setup Lucene search so that each client can only search within its database? How would you setup the index(es)? Where do you store the index(es)? Would you need to add a filter to all search queries? If a client cancelled, how would you delete their (part of the) index? (this may be trivial--not sure yet) Possible Solutions: Make an index for each client (database) Pro: Search is faster (than one-index-for-all method). Indices are relative to the size of the client's data. Con: I'm not sure what this entails, nor do I know if this is beyond Lucene's scope. Have a single, gigantic index with a database_name field. Always include database_name as a filter. Pro: Not sure. Maybe good for tech support or billing dept to search all databases for info. Con: Search is slower (than index-per-client method). Flawed security if query filter removed. One last thing: I would also accept an answer that uses Solr (the extension of Lucene). Perhaps it's better suited for this problem. Not sure.

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