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• iPhone App link to iStore for commission

  - by Simon

  Is it possible to link from an iPhone application to the iStore so a user can (a) play a sample of music and then navigate to that track in order to buy it? In a bit more detail: the application lists a number of tracks for a particular artist (a recommendation by the app based on user criteria). The user scrolls down the list and finds a track that they are interested in. They play the 30 second sample (as you would in the iStore) and then, if they like it, they press on a link that takes them to the iStore where they can purchase the track. If they buy the track, then the application gets 5% of the money paid for the track. I have looked through the web and found a number of suggestions but nothing seems to fit the specification above. I would be very grateful if anyone is able to tell me whether this is possible and some clues as to how it would be done. Thanks, Simon...

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• Raytracing Meta-Balls without Raymarching

  - by qwerty1793

  In all examples online that I have seen, when rendering meta-balls (level sets of a potential function), the point of ray-meta-ball intersection is always found by raymarching. Are there any alternatives to this for determining the point explicitly?

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• How does an "extern C" declaration work?

  - by samoz

  I'm taking a programming languages course and we're talking about the "extern C" declaration. How does this declaration work at a deeper level other than "it interfaces C and C++"? How does this affect the bindings that take place in the program as well?

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• Axis2 aar file structure question

  - by Alan Mangroo

  I trying to create an Axis2 arr file that has 2 package heirachies. However my service class is throwing a class not found exception when it tries to use classes in the utils package. Is it possible to do this in Axis? Any advice is very welcome. Below is an example of the structure I am trying to create (utils and org are both top level packages)... |- SampleService |-- META-INF |--- services.xml |-- utils |---MyUtils.class |-- org |---- apache |---- axis2 |----- axis2userguide |------ SampleService.class

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• Is there any way to find unreferenced code in Flex Builder?

  - by Andrew Aylett

  We've got several Flex projects, one of which has just been refactored. I'm wondering if there's an easy way to tell which classes and functions (if any) aren't being used any more? I've discovered that we've definitely got some unused code, because running ASDoc on the entire project reports some compilation errors which don't get reported by Flex Builder (implying that those classes aren't being used any more). I'm hoping to find a more robust and complete method, and preferably one which can work at function level too.

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• How to display total record count against models in django admin

  - by Rog

  Is there a neat way to make the record/object count for a model appear on the main model list in the admin module? I have found techniques for showing counts of related objects within sets in the list_display page (and I can see the total in the pagination section at the bottom of the same), but haven't come across a neat way to show the record count at the model list level.

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• Why does Maven have such a bad rep?

  - by Dan

  There is a lot of talk on the internet about how Maven is bad. I have been using some features of Maven for a few years now and the most important benefit in my view is the dependency management. Maven documentation is less than adequate, but generally when I need to accomplish something I figure it once and than it works (for example, I remember when I implemented signing the jars.) I don’t think that Maven is great, but it does solve some problems that without it would be a genuine pain. So, why does Maven has such a bad rep and what problems with Maven can I expect in the future? Maybe there are much better alternatives that I don't know about? (For example, I never looked Ivy in detail.) NOTE: This is not an attempt to cause an argument. It is an attempt to clear the FUD.

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• How to sort a list alphabetically and have additional lists sorted in the same order

  - by Carl

  I have 3 lists, each with equal elements: email addresses, salaries and IDs I'd like to sort the email addresses alphabetically and in some way sort the other 2 lists (salaries and IDs). E.g., Emails: [email protected] [email protected] Salaries: 50000 60000 IDs: 2 1 The puzzle: I'd like to sort Emails such that [email protected] is first and [email protected] is last and Salaries is 60000 then 50000 and IDs is 1 then 2. Additional detail: 1. Length of lists are the same and can be longer than two elements. 2. I will subsequently pass IDs to functions to retrieve further lists. Those lists won't need sorting as they will adopt the order of the IDs list.

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• Ruby on Rails Foreigner plugin not working for SQL Server

  - by Earlz

  Well, now that I've finally got my stupid ODBC stuff configured, I took a schema.rb file that I dumped from a Postgres database and did a db:schema:load on it in a Rails project configured for SQL Server. Well, it sets up all the schema in the SQL Server database except for a minor detail: No foreign keys are created. The rake command doesn't show any errors and does say it is adding foreign keys. But they don't actually get added. This is the last bit from the command: -- add_foreign_key("workhistoryform", "form", {:name=>"workhistoryform_form_rid_fkey", :column=>"form_rid", :primary_key=>"form_rid"}) -> 0.0002s -- initialize_schema_migrations_table() -> 0.0092s -- assume_migrated_upto_version(0) -> 0.0942s [earlz@earlzarch avp_msql_migrations]$ So what is the problem? Does the Foreigner plugin not work in SQL Server? If it didn't I'd expect to see an error or something...

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• ASP.NET - Nested Custom Templates

  - by Echilon

  I'm thinking about converting a few usercontrols to use templates instead. One of these is my own UC which contains some controls, one of which is a repeater. Is it possible to specifcy a template for the second level usercontrol from the template for the first (which would be on the page)?

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• Silverlight IDE for latest version (May 2010)

  - by lexu

  In 2008 Artur Carvalho asked for an Alternative IDE for Silverlight and was told to look at Visual Studio Express. Is that still the valid answer in 2010 or are there other IDEs one should consider (cost/ OS it runs on / stability)? I'm trying to get a feel for silverlight development before commiting cash. So I don't need enterprize level tools or a license to distribute .. Would MonoDevelop and Moonlight be an option?

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• Maven problems using GAE and DataNucleus

  - by Wraith

  I'm having trouble retrieving 2 artifacts in my Maven/Java/Google App Engine project: com.google.appengine.orm:datanucleus-appengine:jar:1.0.7.final com.google.appengine:appengine-api-1.0-sdk:jar:1.3.4 There's a similar question posted, but each answer brings me back to the same error message. More detail I don't know if it is relevant, but rather than a version number, my original dependency for DataNucleus contained a variable. I am using Eclipse. <groupId>org.datanucleus</groupId> <artifactId>datanucleus-core</artifactId> <version>${datanucleus.version}</version> <scope>runtime</scope> I did not include my stack trace in Maven for brevity's sake. Please let me know if it would help to post it. Thank you.

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• Java - Regex problem

  - by Yatendra Goel

  I want a regex to find the following types of strings: http://anything.abc.tld http://anything.abc.tld/ where abc - abc always remains abc anything - it could be any string tld - it could be any tld (top-level-domain) like .com .net .co.in .co.uk etc.

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• SQL Server: invalid object name how to solve it?

  - by Phsika

  error returns to me in below codes: Msg 208, Level 16, State 1, Line 1 Invalid object name 'ENG_PREP'. insert into ENG_PREP VALUES('572012-01-1,572012-01-2,572012-01-3,572013-01-1,572013-01-2', '', '500', '', 'A320 P.001-A', 'Removal of the LH Wing Safety Rope', '', '', '', '0', '', 'AF', '12-00-00-081-001', '', '', '', '', '', '', '' )

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• How to spot empty parking spaces?

  - by mithila

  I want to do a final year B.Sc project on parking space detection. Can anybody give me some link related to it? Any text-book, tutorial or anything? What would be prerequisite for this project? What type of skills(programming/math) are needed? What are the initial steps to do? What type of readings(algorithms of image processing) are needed? Detail added in comments: i'm going to use camera, not infrared. i would like to use still images, or one camera which captures images from a parking lot. i think reak-time processing will be tough, at this moment i just need to start the project. so still images will work fine. but later it may b a real-time project

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• Is the board game "Go" NP complete?

  - by sharkin

  There are plenty of Chess AI's around, and evidently some are good enough to beat some of the world's greatest players. I've heard that many attempts have been made to write successful AI's for the board game Go, but so far nothing has been conceived beyond average amateur level. Could it be that the task of mathematically calculating the optimal move at any given time in Go is an NP-complete problem?

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• Learning Treetop

  - by cmartin

  I'm trying to teach myself Ruby's Treetop grammar generator. I am finding that not only is the documentation woefully sparse for the "best" one out there, but that it doesn't seem to work as intuitively as I'd hoped. On a high level, I'd really love a better tutorial than the on-site docs or the video, if there is one. On a lower level, here's a grammar I cannot get to work at all: grammar SimpleTest rule num (float / integer) end rule float ( (( '+' / '-')? plain_digits '.' plain_digits) / (( '+' / '-')? plain_digits ('E' / 'e') plain_digits ) / (( '+' / '-')? plain_digits '.') / (( '+' / '-')? '.' plain_digits) ) { def eval text_value.to_f end } end rule integer (( '+' / '-' )? plain_digits) { def eval text_value.to_i end } end rule plain_digits [0-9] [0-9]* end end When I load it and run some assertions in a very simple test object, I find: assert_equal @parser.parse('3.14').eval,3.14 Works fine, while assert_equal @parser.parse('3').eval,3 raises the error: NoMethodError: private method `eval' called for # If I reverse integer and float on the description, both integers and floats give me this error. I think this may be related to limited lookahead, but I cannot find any information in any of the docs to even cover the idea of evaluating in the "or" context A bit more info that may help. Here's pp information for both those parse() blocks. The float: SyntaxNode+Float4+Float0 offset=0, "3.14" (eval,plain_digits): SyntaxNode offset=0, "" SyntaxNode+PlainDigits0 offset=0, "3": SyntaxNode offset=0, "3" SyntaxNode offset=1, "" SyntaxNode offset=1, "." SyntaxNode+PlainDigits0 offset=2, "14": SyntaxNode offset=2, "1" SyntaxNode offset=3, "4": SyntaxNode offset=3, "4" The Integer... note that it seems to have been defined to follow the integer rule, but not caught the eval() method: SyntaxNode+Integer0 offset=0, "3" (plain_digits): SyntaxNode offset=0, "" SyntaxNode+PlainDigits0 offset=0, "3": SyntaxNode offset=0, "3" SyntaxNode offset=1, "" Update: I got my particular problem working, but I have no clue why: rule integer ( '+' / '-' )? plain_digits { def eval text_value.to_i end } end This makes no sense with the docs that are present, but just removing the extra parentheses made the match include the Integer1 class as well as Integer0. Integer1 is apparently the class holding the eval() method. I have no idea why this is the case. I'm still looking for more info about treetop.

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• Java binary files writeUTF... explain specifications...

  - by user69514

  I'm studying Java on my own. One of the exercises is the following, however I do not really understand what it is asking to.... any smart java gurus out there that could explain this in more detail and simple words? Thanks Suppose that you have a binary file that contains numbers whos type is either int or double. You dont know the order of the numbers in the file, but their order is recorded in a string at the begining of the file. The string is composed of the letters i for int, and d for double, in the order of the types of the subsequent numbers. The string is written using the method writeUTF. For example the string "iddiiddd" indicated that the file contains eight values, as follows: one integer, followed by two doubles, followed by two integers, followed by three doubles. Read this binary file and create a new text file of the values written one to a line.

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• How do I make a module in PLT Scheme?

  - by kunjaan

  I tried doing this: #lang scheme (module duck scheme/base (provide num-eggs quack) (define num-eggs 2) (define (quack n) (unless (zero? n) (printf "quack\n") (quack (sub1 n))))) But I get this error: module: illegal use (not at top-level) in: (module duck scheme/base (provide num-eggs quack) (define num-eggs 2) (define (quack n) (unless (zero? n) (printf "quack\n") (quack (sub1 n))))) what is the correct way?

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• Using Navigation Controller in a subview of View based Applicatin

  - by iphonix

  Some one please help me with this. I am developing an iPhone app and have stared with View Based Application. I have buttons on my root view screen to take user to other views with their own nibs and classes. On one of those views I need to display a table getting data from SQLite database and then display detail of the selected item depending on the selection from the table. At later stage I also need to add forms to add data. Now, how to add a Navigation Controller in that view for drill down? Can we convert a View Controller to Navigation Controller just by adding a Navigation bar at the top?

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• List of header file locations for the Havok Physics Engine

  - by QAH

  Hello everyone! I am trying to integrate the Havok physics engine into my small game. It is a really nice SDK, but the header files are all over the place. Many headers are deeply nested in multiple directories. That gets confusing when you are trying to include headers for different important objects. I would like to know if there is a nice guide that will let you know where certian objects are and what headres they are in. I have already looked at Havok's documentation, and I also looked at the reference manual, but they don't give great detail as to where certain classes are located (header location). Also, is there any programs out there that can scan header files and create a list of where objects can be found? Thanks again

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• Using other log4net logging levels than the usual ones

  - by vtortola

  Hi, I've realised that there is more levels than all, debug, info, warn, error and fatal, they are listed in the log4net.Core.Level class. But how can I use them? I mean, in the ILog interface you have methods to use the usual ones, but what if you want to use "Fine" or "Emergency", etc? Cheers.

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• How to use CASE in SQL , Syntax Error being shown

  - by Shantanu Gupta

  I am trying to retrieve some records from table based on my query but it shows me an error Msg 102, Level 15, State 1, Line 2 Incorrect syntax near ' select vd.LedgerId,(CreditAmt-DebitAmt) AS NET, CASE NET WHEN NET > 0 THEN 'Debit' WHEN NET < 0 THEN 'Credit' ELSE 'Nil'End from dbo.vdebit vd INNER JOIN dbo.vCredit vc ON vd.LedgerId=vc.LedgerId

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• Get window handle from window class name

  - by Einar Egilsson

  I'm trying to get a window handle on a child window in my process and the only information I have is the window class name. Are there any win32 functions I can use for that? I'm doing this from C#. A bit more detail: This is a Visual Studio plugin, written in C#. So my process is visual studio, which has lots of windows. One of them has a window class "VsTipWindow". I don't know the immediate parent window of that window, all I have is the class name. Is there any way for me to get the window handle from just that?

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• SQL CLR Stored Procedure and Web Service

  - by Nathan

  I am current working on a task in which I am needing to call a method in a web service from a CLR stored procedure. A bit of background: Basically, I have a task that requires ALOT of crunching. If done strictly in SQL, it takes somewhere around 30-45 mins to process. If I pull the same process into code, I can get it complete in seconds due to being able to optimize the processing so much more efficiently. The only problem is that I have to have this process set as an automated task in SQL Server. In that vein, I have exposed the process as a web service (I use it for other things as well) and want the SQL CLR sproc to consume the service and execute the code. This allows me to have my automated task. The problem: I have read quite a few different topics regarding how to consume a web service in a CLR Sproc and have done so effectivly. Here is an example of what I have followed. http://blog.hoegaerden.be/2008/11/11/calling-a-web-service-from-sql-server-2005/ I can get this example working without any issues. However, whenever I pair this process w/ a Web Service method that involves a database call, I get the following exceptions (depending upon whether or not I wrap in a try / catch): Msg 10312, Level 16, State 49, Procedure usp_CLRRunDirectSimulationAndWriteResults, Line 0 .NET Framework execution was aborted. The UDP/UDF/UDT did not revert thread token. or Msg 6522, Level 16, State 1, Procedure MyStoredProc , Line 0 A .NET Framework error occurred during execution of user defined routine or aggregate 'MyStoredProc': System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. System.Security.SecurityException: at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) at System.Security.CodeAccessPermission.Demand() at System.Net.CredentialCache.get_DefaultCredentials() at System.Web.Services.Protocols.WebClientProtocol.set_UseDefaultCredentials(Boolean value) at MyStoredProc.localhost.MPWebService.set_UseDefaultCredentials(Boolean Value) at MyStoredProclocalhost.MPWebService..ctor() at MyStoredProc.StoredProcedures.MyStoredProc(String FromPostCode, String ToPostCode) I am sure this is a permission issue, but I can't, for the life of me get it working. I have attempted using impersonation in the CLR sproc and a few other things. Any suggestions? What am I missing?

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