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• Aaron Hillegass Chapter 18 Challenge Question

  - by jasonbogd

  I am working through Aaron Hillegass' Cocoa Programming for Mac OS X and am doing the challenge for Chapter 18. Basically, the challenge is to write an app that can draw ovals using your mouse, and then additionally, add saving/loading and undo support. I'm trying to think of a good class design for this app that follows MVC. Here's what I had in mind: Have a NSView-subclass that represents an oval (say JBOval) that I can use to easily draw an oval. Have a main view (JBDrawingView) that holds JBOvals and draws them. The thing is that I wasn't sure how to add archiving. Should I archive each JBOval? I think this would work, but archiving an NSView doesn't seem very efficient. Any ideas on a better class design? Thanks.

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• Algorithm and data structure learning resources for dynamic programming

  - by Pranav

  Im learning dynamic programming now, and while I know the theory well, designing DP algorithms for new problems is still difficult. This is what i would really like now- A book or a website, which poses a problem which can be solved by dynamic programming. Also there is the solution with an explanation available, which i would like to see if i cant solve the problem even after butting my head at it for a few hours. Is there some resource that provides this sort of a thing for several categories of algorithms- like graph algorithms, dynamic programming, etc? P.S. I considered Topcoder, but the solutions there are not really appropriate for learning to implement efficient solutions.

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• Avoid implicit conversion from date to timestamp for selects with Oracle 11g using Hibernate

  - by sapporo

  I'm using Hibernate 3.2.1 criteria queries to select rows from an Oracle 11g database, filtering by a timestamp field. The field in question is of type java.util.Date in Java, and DATE in Oracle. It turns out that the field gets mapped to java.sql.Timestamp, and Oracle converts all rows to TIMESTAMP before comparing to the passed in value, bypassing the index and thereby ruining performance. One solution would be to use Hibernate's sqlRestriction() along with Oracle's TO_DATE function. That would fix performance, but requires rewriting the application code (lots of queries). So is there a more elegant solution? Since Hibernate already does type mapping, could it be configured to do the right thing?

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• XML generation error.

  - by Janis Peisenieks

  I'm trying to generate an XML output with Zend_Framework, but this nasty thing keeps popping up: XML Parsing Error: XML or text declaration not at start of entity Location: http://cart/index/kurpirkt Line Number 2, Column 1:<?xml version="1.0" encoding="utf-8"?> ^ As far as I know there are no white-spaces in any of my include files, and even if there were, I think that the ob_clean() function should have taken care of it. Here is my code: public function kurpirktAction() { ob_clean(); // XML-related routine $xml = new DOMDocument('1.0', 'utf-8'); $xml->appendChild($xml->createElement('foo', 'bar')); $output = $xml->saveXML(); // Both layout and view renderer should be disabled Zend_Controller_Action_HelperBroker::getStaticHelper('viewRenderer')->setNoRender(true); Zend_Layout::getMvcInstance()->disableLayout(); // Setting up headers and body $this->_response->setHeader('Content-Type', 'text/xml; charset=utf-8') ->setBody($output); } Any help or suggestions?

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• Testing injected dependencies into your struts2 actions

  - by Barry

  Hi, I am wondering how others might have accomplished this. I found in the Spring documentation @required which I attempted to use in a 'test' but got this stmt INFO XmlConfigurationProvider:380 - Unable to verify action class [xxx] exists at initialization I have found another way in spring to do this is to write custom init methods and declare those on the bean but it almost seems like this is a strange thing to do to a struts2 action. In my application I inject through spring different web services (via setter injection) into different actions. I want to ensure on startup these are not null and set.

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• Get stacktrace from stuck python process

  - by piquadrat

  I have to run a legacy Zope2 website and have some grievance with it. The biggest issue is that, occasionally, it just locks up, running at 100% CPU load and not answering to requests anymore. While the problem isn't reproducible on a regular basis, one page containing 3 dynamic graphs triggers it sometimes, so I suspect some kind of race condition that leads to an endless loop or a stuck busywait. The problem is, I have not yet found a way to debug this thing. There's nothing in the Zope logs and nothing in the system logs. I tried the suggestions from this question to get a stacktrace, but the only signal that has any effect is SIGKILL. Is there another possibility to find out where exactly the process is when it gets stuck?

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• What does double? mean in C# ?

  - by Nikhil

  Hi, While reading the code of the NUnit project's assert class, I came across this particular construct - public static void AreEqual(double expected, double? actual, double delta) { AssertDoublesAreEqual(expected, (double)actual, delta ,null, null); } In this function the second input parameter is entered as "double?". The interesting thing is that this code compiles without issue in VS2010 (c# 4.0). Anyone know why this is NOT throwing an error ? Why is "double?" considered a valid keyword and is there any special significance to the "?".

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• Cost of using ASP.NET

  - by Mackristo

  One thing that I keep hearing in reference to ASP.NET and MSFT technologies is that they cost money to use. Often when they are being compared to open source languages someone will mention that one factor in favor of open source is that it's free (to an extent). My question is, when does ASP.NET actually cost money to use in terms of using the proprietary technology? Understandably there are the hosting fees, but I'm curious about the fees outside of these hosting fees. I'm especially curious about this as it relates one-person smaller-site development (non-team/large enterprise). Any help is appreciated. (edits) Some excellent answers. Much appreciated The projects that I'm looking to use the technologies for would be personal sites and very small business sites (1 or 2). The intent would of course be that these projects get much bigger. It seems that for commercial production, fees will apply. What about just basic dynamic "shared hosting" sites that provide information?

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• CSS Frameworks like 960 and Blueprint?

  - by Dean J

  This is at the framework level, not dealing directly with CSS, so posting to SO. I just learned about the existence of CSS frameworks. 960 Grid System seems pretty awesome, then I found Blueprint, which seems to do the same thing and more. Is there a better word than "framework" to categorize this? Are there any other products in this category? In response to one of the comments http://stackoverflow.com/questions/1483565/link-to-a-site-designed-using-a-css-framework-blueprint-960-etc, "how many example frameworks do you want? he just listed two of them.", I'd love to have more than two examples, unless those are the only two in the running. Blueprint, which is "the original CSS framework" 960 Grid System, which is a tool to have a grid underlying your screen. YUI 2: Grids, similar to 960? The rest of YUI is more similar to JQuery?

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• Customize WebForm module in Drupal

  - by Maksim

  I'm new to Drupal 6.10 CMS and PHP too. I'm creating my website with drupal and I have found a module called Webform I like it, it's pretty easy to create forms with different types of fields and file uploading. The one thing that i can't figure out is how to add Rich Text before all fields. Something like introduction to the form. This module has "Description" field that will show text as a plain text but it doesn't have rich text in it. What can I use to make that happen. Is it possible to hardcode html there or is there any other modules that can allow to do something like that? Thanks

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• Why is LOGON_USER Server Variable is blank on New Windows / New Tab?

  - by Alex Papadimoulis

  We are noticing some very strange behavior on an installation of a .NET2-based webapp on Server 2008. Our app uses "old school" Integrated Windows Authentication and simply reads the LOGIN_USER server variable from the request collection. There's a good reason for this, but that's somewhat irrelevant to the question, since the underlying WindowsAuthentication code from ASP.NET does the same thing. Anyway... When you enter the URL in the browser, it loads up just fine and displays the username (from LOGIN_USER) no problem. When you click on a link within the web app, it loads the page just fine and authenticates without any problems. When you "hard refresh" (Ctrl-F5) it also works just fine. However, when you click "open in a new window" or "open in a new tab", the LOGON_USER variable is blank Any ideas? Am I missing some IIS7 setting somewhere? Tested clients are Windows 7 with IE8 or Windows XP with IE6.

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• using a php variable in the WHERE clause of a mysql query

  - by user1262890

  I'm running a very simple query that I think should work. The only thing that I haven't done before is put a php variable in the WHERE clause of the query. The variable $X is a numerical value, say 100. When I run this query, I just get a value of 0 returned. Am I doing something obviously stupid? SELECT generator_64k.n FROM generator_64k WHERE generator_64k.n<= '$X' I've looked around the web and also tried this: SELECT generator_64k.n FROM generator_64k WHERE generator_64k.n<= '" . $X . "' But this also just returns 0. Any ideas? Thanks in advance.

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• PartCover shows 0% coverage for getter and 100% coverage for setter despite the code being commented

  - by Gorgsenegger

  Hi all, I have a public property in my code as below: [DependencyInjection] public IEVentController EventController { get; set; } I also have a line of code referencing the EventController property: EventController.ExecuteObjectEvents( someObject, null ); Now currently (due to some missing implementation in another part of the application) I commented both these code sections out. Nevertheless, when I run PartCover it shows me a coverage of 0% for get_EventController and 100% for set_EventController. The strange thing is, that the Coverage Details view also correctly shows me that the code is commented out and therefore should not be treated as code - why does PartCover recognise it anyway? I would have expected to not get the getter and setter listed in the PartCover result. There is definitely no other reference to that code in the class to be tested, any ideas? Thanks in advance & Best regards G.

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• PresentModalViewController problem.

  - by james.ingham

  I have a new view controller on the iPhone which I call using the following line of code: [self presentModalViewController:controller animated:NO]; This works great if animation is on, but I am looking to have an instant switch. The problem is when I set animation to NO, the whole view shifts 20px to the right (it is always in landscape mode) as if there is a status bar but in portrait mode!? In this example the yellow space is the new view controller. I've tried this in a new project and the same thing happens. It may be a bug but does anyone have a fix? Thanks

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• Google maps : How to open an InfoWindow for a Polygon by clicking on it?

  - by JB

  Hello ! I have a simple question, but i can't find the answer in the Google Maps API documentation... I have a map with 13 polygons drawed by the API. Here is an exemple of one of these polygons : var zone_up_montblanc = new GPolygon([ new GLatLng(46.21270329318585, 6.134903900311617), new GLatLng(46.20538443787925, 6.136844716370282), new GLatLng(46.20525043957647, 6.141375978638086), new GLatLng(46.20698751554006, 6.148050266912262), new GLatLng(46.21110286985207, 6.153203229026629), new GLatLng(46.21730757985668, 6.151718301267355), new GLatLng(46.22092122197341, 6.153676364285801), new GLatLng(46.22615123408969, 6.149844858907489), new GLatLng(46.22851200024137, 6.149876939987202), new GLatLng(46.22945159836955, 6.142758190170017), new GLatLng(46.21735908463437, 6.141457132705133), new GLatLng(46.21753573755057, 6.138058122426195), new GLatLng(46.21270329318585, 6.134903900311617) ], "#6b1f43", 2, 0.9, "#92c87f", 0.5); then : map.addOverlay(zone_up_montblanc); Polygons appears on my map, no problem. But the thing I have to do now is to open an "InfoWindow" by clicking on each polygons (with a different content for each polygons). Did someone have an idea or an example? Thanks a lot for your help !

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• How can I add GET variables to the end of the current page url using a form with php?

  - by zeckdude

  I have some database information that is being shown on a page. I am using a pagination class that uses the $_GET['page'] variable in the url. When you click on a different pagination anchor tag, it changes $_GET['page'] to a new number in the url and shows the corresponding results. I have sort and search features which uses the $_GET['searchby'] and $_GET['search_input'] variables. The user enters their search or sort criteria on a form that is using GET. The variables are then put into the url allowing for the correct results to be shown. The problem I am having is that whenever I click on a pagination link, it adds that to end of the url and erases the search or sort GET variables. The same thing happens when I submit the search/sort form. How can I add GET variables to the end of the current page url using the anchor tag and search/sort form?

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• JavaFX MediaPlayer: problem with setting of mute and volume properties

  - by lady_disaster

  Hi, first of all sorry for my bad english, I'm Italian... :) I'm developing with JavaFX and I'm new of it... I've an instance of a MediaPlayer and I can play songs, but if I set the volume properties to 0 or to other values the volume doesn't change and the song plays at the maximum. If I set the mute properties to true it's the same thing!!! I think that the setting of volume and mute properties doesn't work! Have you found this problem? Do you know which is the solution? Where am I wrong? Please help me... Thanks in advance!!!!

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• Microsoft Entrourage: rendering hyperlinks?

  - by rehanift

  When we send emails from my project, we send in both text/plain and text/html formats. All major clients (gmail, yahoo, hotmail, thunderbird, outlook) correctly display the simple HTML that we are using. However, Entourage renders all tags EXCEPT hyperlinks. What is confusing is that emails from other domains render hyperlinks correctly in Entourage. We have tried comparing the source / headers of our emails with others emails that seem to "work" and don't see any obvious differences. I googled around this issue and the only thing I could find what that Entourage doesn't allow users to insert hyperlinks when composing a message. Does anyone know what I might be doing wrong?

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• SLES 9 vs. SLES 10

  - by Michael Covelli

  Are there any important change in how SLES 10 implements Tcp sockets vs. SLES 9? I have several apps written in C# (.NET 3.5) that run on Windows XP and Windows Server 2003. They've been running fine for over a year, getting market data from a SLES 9 machine using a socket connection. The machine was upgraded today to SLES 10 and its causing some strange behavior. The socket normally returns a few hundred or thousand bytes every second. But occasionally, I stop receiving data. Ten or more seconds will go by with no data and then Receive returns with a 10k+ bytes. And some buffer is causing data loss because the bytes I receive on the socket no longer make a correct packet. The only thing changed was the SLES 9 to 10 upgrade. And rolling back fixes this immediately. Any ideas?

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• Eclipse thinks there are problems with my Android project...

  - by Dan Watling

  I have an Android project and Eclipse is telling me my project has an error with its build path. Specifically, the problem view shows "The project cannot be built until build path errors are resolved". The entire project builds just fine, meaning there are no red X's on any of the files. I can build the project outside of Eclipse, deploy it to the device, and it runs just fine, so I know there isn't a problem with my source code or layouts. The strange thing is when I remove the 'src' folder from the build path in Eclipse, clean and build the project, then re-add the 'src' folder to the build path and build the project it works again. However, within a few changes it gives me the same problem. Has anyone else encountered this before? Does anyone know of a solution? It's driving me mad! Thanks, -Dan

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• Cannot login with PhpMyAdmin on Mac os x 10.6. Does anyone know a fix to this error message?

  - by Jannis

  Hi, I just reinstalled Mac Os X 10.6.2 and had to reinstall/update my MySQL server. I run phpMyAdmin inside my localhost and I used to be able to login without a hitch. Since the updated (latest version MySQL 5.1.45 & PMA 3.3.1) versions I only get the following error when trying to login with phpMyAdmin: phpMyAdmin - Error Cannot start session without errors, please check errors given in your PHP and/or webserver log file and configure your PHP installation properly. The only thing I noticed is that mcrypt cannot be loaded (this has always been the case, no idea what to do to install this..) but this has never been a problem before. If anyone know what to do here that would be really appreciated. Thanks for reading, Jannis PS: The MySQL server itself is running and I am able to login with as root user via the MySQL Administrator.app

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• How to learn high-level Java web development concepts

  - by titaniumdecoy

  I have some experience writing web applications in Java for class projects. My first project used Servlets and my second, the Stripes framework. However, I feel that I am missing the greater picture of Java web development. I don't really understand the web.xml and context.xml files. I'm not sure what constitutes a Java EE application as opposed to a generic Java web application. I can't figure out how a bean is different from an ordinary Java class (POJO?) and how that differs from an Enterprise Java Bean (EJB). These are just the first few questions I could think of, but there are many more. What is a good way to learn how Java web applications function from the top down rather than simply how to develop an application with a specific framework? (Is there a book for this sort of thing?) Ultimately, I would like to understand Java web applications well enough to write my own framework.

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• How significant is the bazaar performance factor?

  - by memodda

  I hear all this stuff about bazaar being slower than git. I haven't used too much distributed version control yet, but in Bazaar vs. Git on the bazaar site, they say that most complaints about performance aren't true anymore. Have you found this to be true? Is performance pretty much on par now? I've heard that speed can affect workflow (people are more likely to do good thing X if X is fast). What specific cases does performance currently affect workflow in bazaar vs other systems (especially git), and how? I'm just trying to get at why performance is of particular importance. Usually when I check something in or update it, I expect it to take a little while, but it doesn't matter. I commit/update when I have a second, so it doesn't interfere with my productivity. But then I haven't used DVCS yet, so maybe that has something to do with it?

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• UiElement from abstract class

  - by plotnick

  I placed a control into a grid. let's say the control is derived from public class 'ButBase' which is derived in its turn from System.Windows.Controls.Button. The code normally compiles and app works just fine. But there's something really annoying. When you try to switch to xaml-design tab it will say 'The document root element is not supported by the visual designer', which is normal and I'm totally okay with that, but the thing is, that all the xaml code is underlined and VS2010 says: 'Cannot create an instance of ButBase' although still normally compiles and able to run. I've tried the same code in VS2008, it said that needs to see a public parameterless constructor in the ButBase, and even after I put one it showed the same error. What do I miss here?

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• Email sent by ActionMailer is taking six hours to deliver mail.

  - by grg-n-sox

  So I have been asked to help maintain a website that uses Ruby on Rails. Now, let me just say I've been programming Ruby for awhile but I am still new to Rails. The first problem brought to my attention is how the activation email takes about six hours to arrive. It would be one thing if the email was not being sent due to errors but it is being send correctly, just slow. Also the server this is running on is also its own SMTP. I checked how the email was being formatted before calling the setup_email method and everything looks okay. I even dug into the ActionMailer lib and read through the files there and didn't see anything out of the ordinary. So what is most likely causing the email to take six hours to deliver?

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