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  • iPhone programming - problem with CoreFoundation forking, PLEASE for the love of god help! lol

    - by Tom
    Hello all, I've been working on an iPhone for several months. It's a 2d shooting game akin to the old Smash TV type games. I'm doing everything alone and it has come out well so far, but now I am getting unpredictable crashes which seem to be related to CoreFoundation forking and not exec()ing, as the message THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONA LITY_YOU_MUST_EXEC__ always shows up somewhere in the debugger. Usually it shows up around a CFRunLoopRunSpecific and is related to either a timer firing or _InitializeTouchTapCount. I cannot figure out exactly what is causing the fork to occur. My main game loop is running on a timer, first updating all the logic and then drawing everything with openGL. There is nothing highly complex or unusual. I understand you cannot make CF calls on the childside of a fork, or access shared memory and things like that. I am not explicitly trying to fork anything. My question is: can anyone tell me what type of activity might cause CoreFoundation to randomly fork like this? I'd really like to finish this game and I don't know how to solve this problem. Thanks for any help.

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  • Mercurial outgoing Hook

    - by Tom Bell
    I'm looking to create a Mercurial hook that pushes to a backup remote repository when I push to a local repository. I thought I could hook the 'outgoing' hook, but this creates a infinite loop that isn't pretty. So is there like a post-push hook, or would it be best to have the repository I am pushing to have an 'incoming' hook to push the to the remote backup instead?

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  • What is the coolest thing you can do in <10 lines of simple code? Help me inspire beginners!

    - by Tom Ritter
    I'm looking for the coolest thing you can do in a few lines of simple code. I'm sure you can write a Mandelbrot set in Haskell in 15 lines but it's difficult to follow. My goal is to inspire students that programming is cool. We know that programming is cool because you can create anything you imagine - it's the ultimate creative outlet. I want to inspire these beginners and get them over as many early-learning humps as I can. Now, my reasons are selfish. I'm teaching an Intro to Computing course to a group of 60 half-engineering, half business majors; all freshmen. They are the students who came from underprivileged High schools. From my past experience, the group is generally split as follows: a few rock-stars, some who try very hard and kind of get it, the few who try very hard and barely get it, and the few who don't care. I want to reach as many of these groups as effectively as I can. Here's an example of how I'd use a computer program to teach: Here's an example of what I'm looking for: a 1-line VBS script to get your computer to talk to you: CreateObject("sapi.spvoice").Speak InputBox("Enter your text","Talk it") I could use this to demonstrate order of operations. I'd show the code, let them play with it, then explain that There's a lot going on in that line, but the computer can make sense of it, because it knows the rules. Then I'd show them something like this: 4(5*5) / 10 + 9(.25 + .75) And you can see that first I need to do is (5*5). Then I can multiply for 4. And now I've created the Object. Dividing by 10 is the same as calling Speak - I can't Speak before I have an object, and I can't divide before I have 100. Then on the other side I first create an InputBox with some instructions for how to display it. When I hit enter on the input box it evaluates or "returns" whatever I entered. (Hint: 'oooooo' makes a funny sound) So when I say Speak, the right side is what to Speak. And I get that from the InputBox. So when you do several things on a line, like: x = 14 + y; You need to be aware of the order of things. First we add 14 and y. Then we put the result (what it evaluates to, or returns) into x. That's my goal, to have a bunch of these cool examples to demonstrate and teach the class while they have fun. I tried this example on my roommate and while I may not use this as the first lesson, she liked it and learned something. Some cool mathematica programs that make beautiful graphs or shapes that are easy to understand would be good ideas and I'm going to look into those. Here are some complicated actionscript examples but that's a bit too advanced and I can't teach flash. What other ideas do you have?

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  • Show div on click — jquery

    - by Tom Julian Hume
    When a div is clicked, I want different div to appear. Thus, when '#music' is clicked, I want '#musicinfo' to appear. Here is the code: #music { float:left; height:25px; margin-left:25px; margin-top:25px; margin-right:80px; font-family: "p22-underground",sans-serif; font-style: normal; font-weight: 500; font-size:13pt; } #musicinfo { width:380px; margin:25px; font-family: "p22-underground",sans-serif; font-style: normal; font-weight: 500; font-size:13pt; line-height:1.1; display:none; } and jquery: <script type="text/javascript"> $("#music").click(function () { $("#musicinfo").show("slow"); }); </script> The current website is: here Any help whatsoever would be great :)

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  • Orcad / Matlab: How to plot the roots of a polynomial

    - by Tom
    Hi everyone, Im trying to plot the roots of a polynomial, and i just cant get it. First i create my polynomial p5 = [1 0 0 0 0 -1] %x^5 - 1 r5 = roots(p5) stem (p5) Im using the stem function, but I would like to remove the stems, and just get the circle around the roots. Is this possible, is stem the right command? Thanks in advance, PS: This is not homework, but very close, will tag it if requested.

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  • AMF data is incomplete with Flex Service

    - by Tom
    Hello everybody. I am bussy with a Flex Project with a data services. Flash builder installed Zend Framework with Zend_Amf. When i run the project i get the error NetConnection.Call.Failed: HTTP: Failed. With chalers i say that Zend_Amf give the error: AMF data is incomplete (0 bytes of 0 bytes). Please check the recording limits in the Recording Settings. I don't know what the problem means. I have searched on google, but i haven't found a good result. The Flex project code is: <?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:authservice="services.authservice.*"> <fx:Script> <![CDATA[ import mx.controls.Alert; protected function click_me_clickHandler(event:MouseEvent):void { text.text += "Test started"; testmeResult.token = authService.testme(); text.text += testmeResult.lastResult text.text += "Test ended"; } ]]> </fx:Script> <fx:Declarations> <s:CallResponder id="testmeResult"/> <authservice:AuthService id="authService" fault="Alert.show(event.fault.faultString + '\n' + event.fault.faultDetail)" showBusyCursor="true"/> <!-- Place non-visual elements (e.g., services, value objects) here --> </fx:Declarations> <s:Button x="124" y="85" label="Click Me!" id="click_me" click="click_me_clickHandler(event)"/> <s:RichText x="58" y="114" width="238" height="182" id="text"/> </s:Application> The php code is: <?php class AuthService { public function testme() { return 'ik ben getest op'+date('d-m-Y H:i:s', time()); } }?> Please, help me!

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  • ClickOnce application configured to perform updates programmatically still sometimes displays the Cl

    - by Tom Hall
    We have a WPF application deployed using ClickOnce which checks for and performs updates programmatically on application startup. This generally behaves perfectly except for the case where the user chooses "No" to our "Do you wish to update?" prompt. In this case, the next time the user launches the application (consistently) the ClickOnce framework's "Update Available" dialog launches with the option to update or skip. This doesn't cause a technical problem but will be confusing to the user to potentially see two completely differently styled dialogs. (If the user chooses Skip to the ClickOnce dialog then the application then launches and renders our own "Update Available" dialog). Any ideas why the ClickOnce framework dialog is showing in this case? Thanks.

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  • Where can I find clear examples of MVC?

    - by Tom
    I've read a couple of things about MVCs but I still don't understand when they should be used and when they shouldn't be used. I am looking for clear examples that say things like "if you're developing this then you should use MVC, like this" and "if you're developing this, you shouldn't use MVC." Most of the examples I've seen rely on complex frameworks which have already implemented everything and you have to learn the framework and use it a lot to understand what's really happening. To many programmers, phrasings such as "UI business logic" sound like marketing terms — for example, the words "Instead the View binds directly to a Presentation Model" are used in this post. I am aware of the dangers that may lurk in the shadows as MVC is a concept and everyone feels like they know it best, yet nobody really knows exactly how to use it because there may be a lot of variables involved and everyone is allowed to have a different perspective on how to dissect a project into the Model, the View and the Controller. There is a lot of theory out there but very few clear examples. What I'm looking for are not "the best" ways of doing it so this should not be considered as subjective; I'm looking for different simple implementations that would allow me to decide on my own which are the best approaches. Succinctly: What are good on-line resources that present pro and con arguments to using MVC in various situations and provide clear examples to help the reader understand the concept?

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  • What's wrong with my regex

    - by Tom Brown
    Yes I know its usually a bad idea to parse HTML using RegEx, but that aside can someone explain the fault here: string outputString = Regex.Replace(inputString, @"<?(?i:script|embed|object|frameset|frame|iframe|metalink|style|html|img|layer|ilayer|meta|applet)(.|\n)*?>", ""); if (outputString != inputString) { Console.WriteLine("unwanted tags detected"); } It certainly detects the intended tags like: <script> and <html>, but it also rejects strings I want to allow such as <B>Description</B> and <A href="http://www.mylink.com/index.html">A Link containing 'HTML'</A>

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  • How do I use a different image for each JQuery UI Slider handle

    - by Tom
    I'm using a JQuery UI slider which has two handles (a.k.a range slider). I know how to style the first handle: .ui-slider-horizontal .ui-slider-handle {background: white url(http://stackoverflow.com/content/img/so/vote-arrow-down.png) no-repeat scroll 50% 50%;} But how do I style the second handle differently? Using Firebug I can see Jquery does not uniquely identify each handle: <div id="hourlyRateSlider" class="ui-slider ui-slider-horizontal ui-widget ui-widget-content ui-corner-all"> <div class="ui-slider-range ui-widget-header" style="left: 26%; width: 46%;"/> <a class="ui-slider-handle ui-state-default ui-corner-all" href="#" style="left: 26%;"/> <a class="ui-slider-handle ui-state-default ui-corner-all" href="#" style="left: 72%;"/> </div> So I imagine I have to use either a CSS child selector which could be cross-browser problematic. Or I could use some JQuery trickery to add a CSS class to the second handle? Anyone done this in a neat way before?

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  • No space left on Android Emulator

    - by Tom
    I have been developing my app for around two months, in the last week i have started getting the following error when trying to compile and run the app from Eclipse: java.io.IOException: Unable to upload file: No space left on device The APK comes out at 3.6Mb and the emulator is a recently created fresh one with 512Mb SD card and other specs identical to the G1. Can anyone suggest a reason this might be happening?

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  • Staging database good practices

    - by Tom
    Hi, I'm about to deploy to production a fairly complex site and for the first time need a staging environment where I can test things in a more realistic environment, especially with regard to some external services that cannot be run locally. My general plan is to develop & test first locally, push simple changes (small bug fixes, HTML/CSS, JS, etc) direct to production, and for larger changes, push first to staging subdomain for thorough testing and then to production. I don't think that I need to keep the staging and production databases in sync (occasional manual updating would do) but I'm wondering if there are any general good practices with regard to maintaing a staging environment in relation to a production environment, especially when it comes to databases. Any general thoughts/advice/experience would be appreciated.

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  • ColdFusion structs Direct Assignment vs object literal notation.

    - by Tom Hubbard
    The newer versions of ColdFusion (I believe CF 8 and 9) allow you to create structs with object literal notation similar to JSON. My question is, are there specific benefits (execution efficiency maybe) to using object literal notation over individual assignments for data that is essentially static? For example: With individual assignments you would do something like this: var user = {}; user.Fname = "MyFirstnam"; user.Lname = "MyLastName"; user.titles = []; ArrayAppend(user.titles,'Mr'); ArrayAppend(user.titles,'Dr.'); Whereas with object literals you would do something like. var user = {Fname = "MyFirstnam", Lname = "MyLastName", titles = ['Mr','Dr']}; Now this limited example is admittedly simple, but if titles was an array of structures (Say an array of addresses), the literal notation becomes awkward to work with.

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  • Viewing HTML inside Applet without using JEditorPane

    - by Tom
    Hello, I have a small (500kb) swing applet that displays very simple/limited set of small HTML page(s) inside it with JEditorPane, however this does not seem to work 100% fluently, some customers get a blank page displayed without any java exceptions. The page works OK from my machine. I need a more reliable way to show HTML page to all our users. Any ideas if there is a small + free class to use instead of JEditorPane OR is there an easy fix to make it more reliable (non blank) private JEditorPane m_editorPane = new JTextPane(); m_editorPane.setEditable( false); m_editorPane.setBackground(new Color(239 ,255, 215)); m_editorPane.setBounds(30,42,520,478 ); m_editorPane.setDoubleBuffered(true); m_editorPane.setBorder(null); m_editorPane.registerEditorKitForContentType("text/html", "com.xxxxx.SynchronousHTMLEditorKit"); m_editorPane.setPage(ResourceLoader.getURLforDataFile(param.trim()));

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  • How many disks is too many in this RAID 5 configuration??

    - by Tom
    HP 2012i SAN, 7 disks in RAID 5 with 1 hot spare, took several days to expand the volume from 5 to 7 300GB SAS drives. Looking for suggestions about when and how I would determine that having 2 volumes in the SAN, each one with RAID 5, would be better?? I can add 3 more drives to the controller someday, the SAN is used for ESX/vSphere VMs. Thank you...

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  • PayPal: IPN vs PDT

    - by Tom
    Hi, I'm having some trouble choosing between PayPal's Instant Payment Notification (IPN) and Payment Data Transfer (PDT). Basically, users buy a one-off product on my site, pay on PayPal, and return to my site. I understand how IPN works but I'm now seeing that I might be able to trigger the various actions that take place after a successful purchase more easily with PDT, as the data gets returned there and then (as opposed to needing a separate listener). However, PayPal's PDT documentation contains this cryptic line: "PDT is not meant to be used with credit card or Express Checkout transactions." ... but I can't find anything further whatsoever on the topic. (1) Are credit cards REALLY not meant to be used with PDT? I would like more than a sentence. (2) Does that mean that a user must have/create a PayPal account to pay? (3) Does it mean that if I want to allow users to pay with their PayPal accounts AND/OR with credit cards directly, I must implement IPN? Could anyone who's gone through this kindly shed some light? Thank you.

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  • Learning AES: the KeyBytes

    - by Tom Brito
    I got the following example from here: import java.security.Security; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; public class MainClass { public static void main(String[] args) throws Exception { Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); byte[] input = "www.java2s.com".getBytes(); byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 }; SecretKeySpec key = new SecretKeySpec(keyBytes, "AES"); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC"); System.out.println(new String(input)); // encryption pass cipher.init(Cipher.ENCRYPT_MODE, key); byte[] cipherText = new byte[cipher.getOutputSize(input.length)]; int ctLength = cipher.update(input, 0, input.length, cipherText, 0); ctLength += cipher.doFinal(cipherText, ctLength); System.out.println(new String(cipherText)); System.out.println(ctLength); // decryption pass cipher.init(Cipher.DECRYPT_MODE, key); byte[] plainText = new byte[cipher.getOutputSize(ctLength)]; int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0); ptLength += cipher.doFinal(plainText, ptLength); System.out.println(new String(plainText)); System.out.println(ptLength); } } I imagine that the byte[] keyBytes should be random generated, so I gone to test the max size before do it. When adding one more byte 0x18 to the array, the exception raised: InvalidKeyException: Key length not 128/192/256 bits. But the original 18 bytes (from 0 to 17) are not multiple of nither 128, 192 or 256. I would like to understand the math here.. can anyone explain me? Thanks!

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  • best way to pick a random subset from a collection?

    - by Tom
    I have a set of objects in a Vector from which I'd like to select a random subset (e.g. 100 items coming back; pick 5 randomly). In my first (very hasty) pass I did an extremely simple and perhaps overly clever solution: Vector itemsVector = getItems(); Collections.shuffle(itemsVector); itemsVector.setSize(5); While this has the advantage of being nice and simple, I suspect it's not going to scale very well, i.e. Collections.shuffle() must be O(n) at least. My less clever alternative is Vector itemsVector = getItems(); Random rand = new Random(System.currentTimeMillis()); // would make this static to the class List subsetList = new ArrayList(5); for (int i = 0; i < 5; i++) { // be sure to use Vector.remove() or you may get the same item twice subsetList.add(itemsVector.remove(rand.nextInt(itemsVector.size()))); } Any suggestions on better ways to draw out a random subset from a Collection?

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  • Retrieving FBO data in GLSL

    - by Tom Savage
    I'm trying to get MRT working in OpenGL to try out deferred rendering. Here's the situation as I understand it. Create 3 render buffers (for example). Two RGBA8 and one Depth32. Create an FBO. Attach render buffers to FBO. ColorAttachment0/1 for color buffers, DepthAttachment for depth buffer. Bind the FBO. Draw geometry. Send data to different attachments using gl_FragData[] in the frag shader. At this point I would want to take the data in another pass using GLSL, how can a) retrieve data from the framebuffer color attachments, b) get data from the depth component.

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  • WPF 4.0 Font Rendering Issue

    - by Tom Allen
    I'm getting a weird rendering issue with WPF 4 applications in the way they render some of the text as it's stretching it and making it very narrow. .net 3.5: .net 4.0: At first I thought it could be a problem with the font, but I'm also seeing the same problem in the Blend 4 beta: I'm running XP SP3, Visual Studio 2010 Professional and everything's as up to date as it can be. I'm not noticing any such problems with Silverlight 4 apps I have built on the same machine... Anyone else seen this or know why it's happening?

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  • Detect if the user has used the back button

    - by Tom
    My webpage runs a javascript function when the page is loaded. However, I don't want the function to run if the user comes back to this page using the back button. How can I prevent this using javascript? $(document).ready(function(){ // Do not run this function if the user has arrived here using the back button RefreshThePage(); });

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  • Retrieving the an SQL Agent job's specific error

    - by Tom Andrews
    I am using msdb..sp_help_job to access whether a job succeeded or failed and can retrieve a general error. But, I want to access the specific error for the step that failed. I cannot seem to find it. It is not in this list of helpful stored procedures provided by MS http://msdn.microsoft.com/en-us/library/ms187763%28v=SQL.100%29.aspx The account running the query is limited but does have the SQLUserAgent role and owns the Jobs that it is accessing.

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