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• Tutorial for Quick Look Generator for Mac

  - by vgm64

  I've checked out Apple's Quick Look Programming Guide: Introduction to Quick Look page in the Mac Dev Center, but as a more of a science programmer rather than an Apple programmer, it is a little over my head (but I could get through it in a weekend if I bash my head against it long enough). Does anyone know of a good basic Quick Look Generators tutorial that is simple enough for someone with only very modest experience with Xcode? For those that are curious, I have a filetype called .evt that has an xml header and then binary info after the header. I'm trying to write a generator to display the xml header. There's no application bundle that it belongs to. Thanks!

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• How do you prevent file confusion if version-control keywords are forbidden?

  - by Thomas L Holaday

  At least two brilliant programmers, Linus Torvalds and Guido von Rossum, disparage the practice of putting keywords into a file that expand to show the version number, last author, etc. I know how keyword differences clutter up diffs. One of the reasons I like SlickEdit's DiffZilla is because it can be set to skip leading comments. However, I have vivid memories of team-programming where we had four versions of a file (two different releases, a customer one-off, and the development version) all open for patching at the same time, and was quite helpful to verify with a glance that each time we navigated to an included header we got the proper one, and each time we pasted code the source and destination were what we expected. There is also the where-did-this-file-come-from problem that arises when a hasty developer copies a file from one place to another using the file system, rather than checking it out of the repository using the tool; or, more defensibly, when files under control in locations A, B, and C need to be marshalled (with cherry-picking) into a distribution location D. In places where VCS keywords are banned, how do you cope?

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• Getting started with Windows Azure

  - by jonhobbs

  Hi All, I'm going to sound like a complete newbie here but here goes... I've just signed up for a Windows Azure account and was hoping to get a simple hello world aspx page up and running in a browser to see how it all works but I can't seem to find a simple guide to getting a very simple web application running. I've got as far as setting up a "service" and going onto the "deploy" page but it's asking me upload an "application package". I've looked on MSDN but there aren't any simple guides, just reams of documentation talking about "roles" and "development fabric". For somebody that is proficient in HTML/CSS and knows a little abit about asp.net it may just as well be in another language. So, does anybody know how to upload a simple aspx page and then access it in a browser? Jon

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• Visual Studio does not flag unterminated string constant in VB.Net

  - by JoelFan

  I noticed that if I leave off the terminating double quote for a string constant in Visual Studio 2010, there is no error or even a warning, i.e. Dim foo as String = "hi However, the continuous integration tool we are using flags an error: error BC30648: String constants must end with a double quote. What's going on here? Is there some language rule in VB.NET that makes a terminating double quote optional "sometimes"? Is there some setting in Visual Studio that will make it flag this as an error?

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• Looking for evolutionary music example code

  - by Dan Dyer

  I would like to implement an interactive evolutionary algorithm for generating music (probably just simple melodies to start with). I'd like to use JFugue for this. Its website claims that it is well-suited to evolutionary music, but I can't find any evolutionary examples. I already have a framework to provide the evolutonary machinery. What I am looking for is some simple, working code that demonstrates viable approaches for the musical part (e.g. suitable encodings and evolutionary operators for the evolved tunes). I have some ideas how it might be achieved, but I'm not particularly knowledgeable about music theory, so to start with I'd like to just reimplement something that is known to work. So does anybody have, or know of, any freely available code (any language is fine) that demonstrates one or more approaches to evolutionary music? EDIT: I'm specifically looking for evolutionary code rather than other techniques that could be used for music synthesis.

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• Deriving arrays in mathematics

  - by Gio Borje

  So I found some similarities between arrays and set notation while learning about sets and sequences in precalc e.g. set notation: {a | cond } = { a1, a2, a3, a4, ..., an} given that n is the domain (or index) of the array, a subset of Natural numbers (or unsigned integer). Most programming languages would provide similar methods to arrays that are applied to sets e.g. upperbounds & lowerbounds; possibly suprema and infima too. Where did arrays come from?

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• How to incorporate WebSockets into a Cocoa application

  - by robw

  I am developing a Cocoa application which involves a chat element. One approach I've considered is using Websockets to handle client-server communication. This would be particularly desirable because chats will also be displayed on a website, and using Websockets could make the implementation very simple. So: would it be possible to use a WebView element, and use Websockets within it? (I know Safari doesn't support Websockets yet, so I imagine this is not possible?) Failing that, are there any Websocket client libraries for C, Objective C, or any other language I could successfully embed within my application? Suggestions welcomed.

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• problem in decoupling urls.py , while following a tutorial of django

  - by Nitin Garg

  http://docs.djangoproject.com/en/dev/intro/tutorial03/ I was at the step Decoupling the URLconfs where the tutorial illustrates how to decouple urls.py. On doing exactly what it says, i get the following error- error at /polls/1/ nothing to repeat Request Method: GET Request URL: http://localhost:8000/polls/1/ Exception Type: error Exception Value: nothing to repeat Exception Location: C:\jython2.5.1\Lib\re.py in _compile, line 241 Python Executable: C:\jython2.5.1\jython.bat Python Version: 2.5.1 Python Path: ['E:\\Programming\\Project\\django_app\\mysite', 'C:\\jython2.5.1\\Lib\\site-packages\\setuptools-0.6c11-py2.5.egg', 'C:\\jython2.5.1\\Lib', '__classpath__', '__pyclasspath__/', 'C:\\jython2.5.1\\Lib\\site-packages'] Server time: Mon, 12 Apr 2010 12:02:56 +0530

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• Porting a piece of Lisp code to Clojure (PAIP)

  - by Robert Brown

  I'm reading Paradigms of Artificial Intelligence Programming (PAIP) by Peter Norvig and I'm trying to write all the code in Clojure rather than common Lisp. However I'm stuck on this piece of code on page 39: (defparameter *simple-grammar* '((sentence -> (noun-phrase verb-phrase)) (noun-phrase -> (Article Noun)) (verb-phrase -> (Verb noun-phrase)) (Article -> the a) (Noun -> man ball woman table) (Verb -> hit took saw liked)) "A grammar for a trivial subset of English.") (defvar *grammar* *simple-grammar*) How can I translate this into Clojure? Thanks.

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• How do I change the background color of the column with the expanders in Eclipse?

  - by Pridkett

  Recently after scorching my retinas from the garish white background in Eclipse, I found some of the excellent posts about how to change the colors so it uses sane (i.e. dark background) colors in the editor. However, one problem present in all solutions is that background of the column with the expanders for code folding is always white. Is there a way to change the background of that column? Here's a screenshot of the problem: I'm not the only person that has this problem, as shown in the screenshots for the following questions: Dark Color Scheme for Eclipse Color Themes for Eclipse (application of color schemes results in this issue on a Mac, no idea about PC) I know that the problem is not language specific as it happens in Java, Python, HTML, and everything else. Any hints on where in the pages of preferences this setting is?

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• C# Object Creation from Datatable

  - by Jonesy

  Hi Folks, Im just getting my head round C#. I've been creating classes and objects so say i created a class called Member: public class Member { public int MemberID; public string FirstName; public string LastName; public string UserName; } and i create a new object of that class by doing this: Member Billy = new Member(); Billy.UserName = "Jonesy"; Billy.FirstName = "Billy"; Billy.LastName = "Jones"; Thats all fine but what if I've queried a database and gotten back 5 members, can I create objects on the fly? Or what is the best way to store these members in memory? I've used VB.Net where I would just add them into a datatable. But I've never really done any object-oriented programming before and thought since I'm learning C sharp nows the best time to learn OOP.. Any help most appreciated! Jonesy

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• Metaprograming - self explanatory code - tutorials, articles, books

  - by elena

  Hello everybody, I am looking into improving my programming skils (actually I try to do my best to suck less each year, as our Jeff Atwood put it), so I was thinking into reading stuff about metaprogramming and self explanatory code. I am looking for something like an idiot's guide to this (free books for download, online resources). Also I want more than your average wiki page and also something language agnostic or preferably with Java examples. Do you know of such resources that will allow to efficiently put all of it into prectice (I know experience has a lot to say in all of this but i kind of want to build experience avoiding the flow bad decitions - experience - good decitions)? Thank you!

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• Can any Palm Pre be used for development?

  - by teedyay

  We're about to start developing software for the Palm, using WebOS. Though an emulator is available for testing, I always feel more confident seeing it run on a physical device as well. I can't find anywhere on Palm's website that tells me whether I can just buy an off-the-shelf Palm Pre and run my app on it, or if I have to buy one with a particular type of contract/ have it unlocked in some way/ whatever. Does anyone know? Have you done this? (Sorry this is barely programming-related, but I couldn't think where else to ask. I'm sure someone has done this and can give me a quick yay or nay. Thanks.) Oh - I'm in the UK, if that makes any difference.

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• Write an add-on or greasemonkey script to "Ajaxify" webpages in Firefox?

  - by Shizhidi

  Hello. I stumbled upon this add-on which "Ajaxifies" parts of its target website. https://addons.mozilla.org/en-US/firefox/addon/51789 I have a similar need like this. I want only part of the webpage's DOM to update upon receiving click on a link, since the website has a rather unified page layout. I have no experiences in writing FF add-ons but I did some basic Ajax and DOM before. So I am looking for programming tips on how to implement "Ajaxification" in a GreaseMonkey script, preferably. If it's not possible, making an add-on is also a sound choice which I'm willing to learn. Thanks in advance!

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• Using Kate with Simple Build Tool (SBT)

  - by Stefan

  Hello I am working with the Kate editor based on the lack of other good tools for Scala development, I am also using IntelliJ however it still has some bugs, and are slow enough to make me impatient. I have just startet using both Kate and SBT, and in that regard I have a little challenge I hope there is an answer for out there on "The Internet". I am using the standard "Build plugin" in Kate and has changed the commands from make to sbt. This works fine, and I am also getting a error report when the sbt fails during compile time. However I really wish to know if it is possible to integrate the compile errors into Kate such that it would be shown under "Errors and Warnings" instead of just in the output tab, where I have to do a manual search for the compile errors. Im guessing that it has something to do with the format of the output, if that is the case maybe it is "just" a smaller adjustment I need to make to the parsing language.

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• is magento overkill for a one-man webshop?

  - by Rick J

  I have been looking at magento for a while and I think I have a decent handle on how to use/customize it. I have a client that wants a webshop , this is just a small business that sells a few products and just supports one language. I was wondering if using magento will be an overkill for a simple webshop , in case I cant help them to make future changes tp the webshop, the people running their business might have to do it. But it looks like magento is made for people with some technical know how (lots of xml editing etc).. So should i go for magento or a simpler solution like osCommerce or maybe even a simple custom solution. Would like to hear your opinions!

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• Reusable socket

  - by Andrew

  I tryed to create a socket in php and reuse it from other process. I know this can be done with a daemon script but I want to do this without. I created a socket and binded it to a specific port. $sock = socket_create (AF_INET, SOCK_STREAM, SOL_TCP); socket_set_option ($sock, SOL_SOCKET, SO_REUSEADDR, 1); socket_bind ($sock, 'xx.xx.xx.xx', 10000); socket_connect ($sock, $host, $port); And from another php file I did the same thing. But the packets that I send from the 2 file are not "validated" by host. I sniffed all ports and I see that it uses same local and destination port. I don't understand where is the problem. Can you help me with this? It's ok in any other programming language, or any other solution for this. Andrew

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• Good websites and/or books to learn game algorithms?

  - by Moshe

  I'm interested in learning video game algorithms. (For iPhone particularly, but generally as well. I assume certain concepts are the same.) I am best off (personally) learning from a book but websites are useful too. What has helped you learn game programming algorithms and concepts? EDIT: As per request, I'll clarify the types of algorithms... I was looking for any algorithms really, but I guess I was interested in (top-down view) platformer algorithms, but, now that you mention it, Seth, I do wonder about chess...

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• jscript "Cannot retrieve referenced URL"

  - by jb

  I have javascript inside a .wsf file and I'm getting the error: C:\bin\LDLSInfo.wsf(53, 34) Windows Script Host: Cannot retrieve referenced URL: S:\tools\JScript\lib\StandardWSH.js At line 53, it says <script language="JScript" src="S:\tools\JScript\lib\StandardWSH.js"/> I know that LDLSInfo.wsf (the main script) and StandardWSH.js (the script to load) both work fine, because I've ran them from a different machine. It works fine on one machine and not on the other, both are Windows 7 x64 computers. So I'm thinking I'm missing some .dll's. Thanks for the help, -jb

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• Objective C block gives link error

  - by ennuikiller

  I'm trying to use objective-c blocks for some iPhone programming and am getting the following link time error: The relevant code is: - (NSDictionary *) getDistances { CLLocationCoordinate2D parkingSpace; NSMutableDictionary *dict; NSIndexSet *indexForUser; BOOL (^test)(id obj, NSUInteger idx, BOOL *stop); test = ^ (id obj, NSUInteger idx, BOOL *stop) { NSString *user = (NSString *)[(NSDictionary *)obj valueForKey:@"userid"]; if ([user isEqualToString:self->sharedUser.userName]) { return YES; } return NO; }; [self->sharedUser.availableParking indexesOfObjectsPassingTest:test]; } Any help would be very much appreciated!!

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• newbie question -- how does one override show for a newtype?

  - by gatoatigrado

  I want to override the default integer constructors in Haskell so they produce strings (mostly for curiosity, but temporarily to make a nice input alternative for LaTeX's \frac{}{} inconvenience). I wanted to be able to use the language itself, instead of a special parser, but I guess that's probably not going to work out... module Main where import Prelude hiding ((+)) newtype A = A Int deriving (Eq, Show, Num) default (A) (+) :: A -> (A -> String) (A a) + (A b) = (show a) ++ " + " ++ (show b) main2 = 3+4 main :: IO () main = putStrLn main2 The problem with the above is that the + function only works for (A, A) instead of (A, String), etc. If one simply leaves out the pattern match "(A a)" and writes "a" instead, then the show() function prepends "A " so "3" becomes "A 3" instead of just "3". I want to override Show for A, but it seems to be quite a headache...

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• How do you keep a balance between working, training, health and family?

  - by Jim Burger

  One trend I see in the awesome developers I've met, is that they devote inordinate amounts of time to coding at the expense of (usually) their health. Personally, I also find it hard to motivate myself to keep healthy. Every now and again, I meet a fantastic coder who has it clocked; they are up to date with the latest dev news, have time to read about good programming practices, and to finish it off, have happy wives/husbands and families. How do you guys/gals manage it in the short 24 hours a day that we all have?

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• Recommendations for 'C' Project architecture guidlines?

  - by SiegeX

  Now that I got my head wrapped around the 'C' language to a point where I feel proficient enough to write clean code, I'd like to focus my attention on project architecture guidelines. I'm looking for a good resource that coves the following topics: How to create an interface that promotes code maintainability and is extensible for future upgrades. Library creation guidelines. Example, when should I consider using static vs dynamic libraries. How to properly design an ABI to cope with either one. Header files: what to partition out and when. Examples on when to use 1:1 vs 1:many .h to .c Anything you feel I missed but is important when attempting to architect a new C project. Ideally, I'd like to see some example projects ranging from small to large and see how the architecture changes depending on project size, function or customer. What resource(s) would you recommend for such topics? Thanks

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• Flex - Is there a way to change the "Channel Disconnected" error message?

  - by Travesty3

  I have a Flash app with a PHP backend. Whenever there is a PHP error, I get the "Channel Disconnected before an acknowledgement was received" error message. I'm getting ready to push my project to beta and I would prefer if this message said something more like "There was a PHP error, please log a bug" or something instead of a message they don't understand. Anyone know of a way for me to change this error message? BTW I'm pretty much a noob when it comes to Flash programming so please be descriptive. Using Flash Builder 4 Beta 2.

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• tetris rotation

  - by Samuel

  Hey, For university we're supposed to write a game (the language is modula2 little chance you know it). Each tetromino is defined through a central piece and 3 relative pieces, Now when it comes to rotation i just rotate the relative blocks (linear algebra). What i am asking myself is how to handle the rotations a user does when the piece has already "landed" because than the user has a little time left to move his pieve quickly into the desired position but in tetris versions all over the web you can "rotate over" other pieces, but i dont seem to get it with my rotation. Over what piece do i need to rotate? are there guidelines? Thanks

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