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• How can I load an MP3 or similar music file for display and analysis in wxWidgets?

  - by Jon Cage

  I'm developing a GUI in wxPython which allows a user to generate sequences of colours for some toys I'm building. Part of the program needs to load an MP3 (and potentially other formats further down the line) and display it to the user. That should be sufficient to get started but later I'd like to add features like identifying beats and some crude frequency analysis. Is there any simple way of loading / understanding an MP3's contents to display a plot of its amplitudes to the screen using wxWidgets? I later intend to port to C++/wxWidgets for speed and to avoid having to distribute wxPython.

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• Does a static object within a function introduce a potential race condition?

  - by Jeremy Friesner

  I'm curious about the following code: class MyClass { public: MyClass() : _myArray(new int[1024]) {} ~MyClass() {delete [] _myArray;} private: int * _myArray; }; // This function may be called by different threads in an unsynchronized manner void MyFunction() { static const MyClass _myClassObject; [...] } Is there a possible race condition in the above code? Specifically, is the compiler likely to generate code equivalent to the following, "behind the scenes"? void MyFunction() { static bool _myClassObjectInitialized = false; if (_myClassObjectInitialized == false) { _myClassObjectInitialized = true; _myClassObject.MyClass(); // call constructor to set up object } [...] } ... in which case, if two threads were to call MyFunction() nearly-simultaneously, then _myArray might get allocated twice, causing a memory leak? Or is this handled correctly somehow?

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• Re-order mysql rows using PHP

  - by dave e

  | id | url | title | menu_id | ------+--------+--------+---------- | 1 | http://| link 1 | 1 | | 2 | http://| link 2 | 2 | | 3 | http://| link 3 | 3 | | 4 | http://| link 4 | 4 | Hi, I was wondering if its possible using PHP to reorder the above to something like below. I am trying to generate a menu which can easily be reordered by clicking an up or down arrow. I have no idea where to start. Any help would be much appreciated. | id | url | title | menu_id | ------+--------+--------+---------- | 1 | http://| link 1 | 2 | | 2 | http://| link 2 | 4 | | 3 | http://| link 3 | 3 | | 4 | http://| link 4 | 1 |

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• Showing a progress bar when downloading a file from the server

  - by Purushotham

  Hi, I need to show a progress bar to the user who requests a file to download. I am using J2EE application to generate the file. User will submit the data from the client side to get the file. The server takes all the submitted data, generates file and sends it back to the requested user. So I want to show a progress bar to the user till the file comes to the him. Is there any way to do this ? I am using java, jquery and javascript in my application.

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• Looking for a way to get HTTP Digest Authentication headers from incoming http requests

  - by duncancarroll

  I've been working on a REST implementation with my existing Cake install, and it's looking great except that I want to use HTTP Digest Authentication for all requests (Basic Auth won't cut it). So great, I'll generate a header in the client app (which is not cake) and send it to my cake install. Only problem is, I can't find a method for extracting that Digest from the request... I've looked through the Cake API for something that I can use to get the Digest Header. You'd think that Request Handler would be able to grab it, but I can't find anything resembling that. There must be another method of getting the digest that I am overlooking? In the meantime I'm writing my own regex to parse it out of the Request... once I'm done I'll post it here so no one has to waste as much time as I did hunting for it.

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• How can I test Windows Error Reporting?

  - by Deneb Meketa

  My company participates in Windows Error Reporting via Winqual. We'd like to add some additional data to our crash reports, using WERRegisterMemoryBlock. Obviously we'd like to make sure this is working before we ship our next version. How can we test it? Is there a way to locally preview precisely what is going to be sent? Does this realistically reproduce what we are going to be able to retrieve from Winqual? Alternatively, can we generate a real report from a developer machine, then retrieve the report from Winqual? How would we distinguish this test case from the rest of our Winqual data?

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• Operational Transformation library?

  - by gamers2000

  I'm looking for a library that would allow me to synchronize text in real-time between multiple users (ala Google Docs). I've stumbled upon Operational Transformation, which seems to fit my needs. Having said that, I understand the gist of OT, but not the math nor implementation of OT. Thus, I was wondering if there was a drag'n'drop Javascript library that would hook into a text area, generate the transforms, then allow me to apply those transformations onto another client? (I've gotten the Etherpad source, but I can't make head or tails out of it. If anyone could point out how to leverage on Etherpad's OT implementation, that'll be great too!)

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• xcode scripting language

  - by PurplePilot

  i notice that Java has a number of ancillary scripting languages. Clojure and Groovy for example. My understanding is that these can be used when the full might and power of Java does not need to be applied and a speedy cludge can be hacked in Groovy/Clojure. But at the end of the day the scripting tools contribution gets compiled into the application Question 1) Is there a similar scripting in x-code? I was not so interested in Python or Ruby in this situation as they are languages in their own right added in, as indeed i think can happen in Java, but i was looking for a purpose built tools. Question 2) If there is such a tool would it count the application out vis-a-vis the new Apple guidelines as to what can be used to generate iXxx apps?

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• Function Composition in C++

  - by Channel72

  There are a lot of impressive Boost libraries such as Boost.Lambda or Boost.Phoenix which go a long way towards making C++ into a truly functional language. But is there a straightforward way to create a composite function from any 2 or more arbitrary functions or functors? If I have: int f(int x) and int g(int x), I want to do something like f . g which would statically generate a new function object equivalent to f(g(x)). This seems to be possible through various techniques, such as those discussed here. Certainly, you can chain calls to boost::lambda::bind to create a composite functor. But is there anything in Boost which easily allows you to take any 2 or more functions or function objects and combine them to create a single composite functor, similar to how you would do it in a language like Haskell?

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• How to invoke static method in C#4.0 with dynamic type?

  - by Morgan Cheng

  In C#4.0, we have dynamic type, but how to invoke static method of dynamic type object? Below code will generate exception at run time. class Foo { public static int Sum(int x, int y) { return x + y; } } class Program { static void Main(string[] args) { dynamic d = new Foo(); Console.WriteLine(d.Sum(1, 3)); } } IMHO, dynamic is invented to bridge C# and other programming language. There is some other language (e.g. Java) allows to invoke static method through object instead of type. BTW, The introduction of C#4.0 is not so impressive compared to C#3.0.

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• why do we have to send the const " type " reference instead of just the types name to the constructo

  - by hamza

  i m trying to make a simple program ( & yes , it is a homework ) that can generate Dates , & like most of normal people : i made my Class attributes private , i tried to send the same type that i m working on to the constructor but the complier have not accept it , i did some research & i found out that in cases like that people generously send a const "type" reference to the constructor witch meant to me that have not understand OOP well so why do we have to send the const " type " reference instead of just the types name to the constructor ? & please give me some links or websites for beginners PS : sorry for my English

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• MVC Routes - How to get a URL?

  - by Seattle Leonard

  In my current project we have a notification system. When an oject is added to another objects collection, an email is sent to those who are subscibed to the parent object. This happens on the object layer and not in the View or Controller. Here's the problem: Although we can say who created what with what information in the email, we cannot embed links to those objects in the email because in the object layer there is no access to a UrlHelper. To construct a UrlHelper you need a RequestContext, which again does not exist on the object layer. Question: I want to make a helper class to create the url's for me. How can I create an object that will generate these urls without a request context? Is it possible?

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• Visual Studio 2008 compiles anything in C++ file?

  - by Brad Pepers

  I noticed today that a source code file in a project was compiling even though it had junk at the top of it. It got me wondering what all would pass without error through the compiler. Here is an example of code that will not generate any error messages: what kind of weird behaviour is this??? #include "stdafx.h" // what is up? int foo(int bar) { bla bla bla????? return bar; } and more junk??? What in the world is the compiler doing to allow this code to compile without giving any error messages? I'm using Visual Studio 2008 and this is unmanaged C++ code. The foo function isn't actually generated in the object file so it can't be used but why no errors???

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• Codeigniter view file looping query

  - by user2505513

  Right, I'm unsure about how to code my view file to generate following query results WITHOUT compromising the principles of mvc. Query in model: SELECT * FROM events GROUP BY country, area ORDER BY country, area View: <?php if (isset($query)):?> <?php foreach ($query as $row):?> <h2><?=$row->country?></h2> <h3><?=$row->area?></h3> <?php endforeach;?> <?php endif;?> I want the results to display: England North South West - utilising the GROUP BY parameter As opposed to: England North England South England West Has anybody any advice as to how to achieve this?

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• Consuming WCF REST service in multiple ways (.Net, plain XML)

  - by Jan Jongboom

  I have become quite frustrated of WCF as I just want to use this simple scenario: Provide a webservice using REST, with a UriTemplate like /method/{param1}/{param2}/ and a 3th parameter that is sent to the service as XML as POST data. Use just plain XML, no SOAP overhead. Be able to generate a proxy in Visual Studio so a .Net using client can easily use the service (don't care about SOAP overhead here). I can create 1. and 2. but no way I can use 3. I tried adding both webHttpBinding and basicHttpBinding endpoints in my services config; I fooled around with the <services/> tag, but I just can't get this working. What am I missing here?! N.B. I checked out this article: http://stackoverflow.com/questions/186631/rest-soap-endpoints-for-a-wcf-service but nothing what is described there seems to work here?!

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• create dynamic link buttons in ListView

  - by Sunny

  Hi, I am creating a search using listview. when user enter a word in search, I am generating a listview with the results. Now, there will be tags in each listview row. When, user clicks the tag, again a search happens using the value in the tag. There may be any number of tags for each listview row. I have to generate linkbuttons for these tags. Could anyone please guide me on how to create dynamic linkbuttons and access those values for further search. You can have a look at delicious.com. I need a similar functionality. Thanks in advance.

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• Autoformat pom.xml without using m2eclipse plugin

  - by hashable

  I don't use the Eclipse maven plugin while developing in Eclipse. I generate my Eclipse classpath externally using the following command: mvn eclipse:eclipse This has worked fine for quite some time and I am not inclined to add a maven plugin. However, I would like to be able to "autoformat" my pom.xml file. My pom.xml is not showing up as a "Source" file and therefore the contextual "Source" menu doesn't show up. Control-Shift-F doesn't work either. Is there a way to do this without installing the m2eclipse plugin? Is there any other generic "XML Editor" plugin that can help with this?

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• sqlite3 date operations when joining two tables in a view?

  - by duncan

  In short, how to add minutes to a datetime from an integer located in another table, in one select statement, by joining them? I have a table P(int id, ..., int minutes) and a table S(int id, int p_id, datetime start) I want to generate a view that gives me PS(S.id, P.id, S.start + P.minutes) by joining S.p_id=P.id The problem is, if I was generating the query from the application, I can do stuff like: select datetime('2010-04-21 14:00', '+20 minutes'); 2010-04-21 14:20:00 By creating the string '+20 minutes' in the application and then passing it to sqlite. However I can't find a way to create this string in the select itself: select p.*,datetime(s.start_at, formatstring('+%s minutes', p.minutes)) from p,s where s.p_id=p.id; Because sqlite as far the documentation tells, does not provide any string format function, nor can I see any alternative way of expressing the date modifiers.

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• Dynamic columns in C# rdlc report

  - by Mugume David

  Suppose I have a report that lists employees (as rows) with their respective taxes charged (in columns). It is possible for a new tax to come up. Since my rdlc report file is currently designed (from XML of-course) to statically generate the coulumns. A future shift in events will need me to alter the rdlc file and add in a new column. how can i do this dynamically. I intend to avoid opening the rdlc file and adding XML code.

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• Recommed html element theme engine for ASP.NET ?

  - by TatMing

  Sorry about my bad english, i am chinese live in HongKong* Is it any theme or css framework can apply to ASP.NET? I work with ASP.NET webform, everybody known web controls generate pure html to work. But i am not good at graphic design, so i want to find some UI helper. I already work with jQuery and Ajax Controll Tookit,but it not much help to make a modern UI design. I have found some commercial library like ComponentArt,DevExpress etc, but is it any free or opensource i can use?

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• Convert C# unit test names to English (testdox style)

  - by Igor Zevaka

  I have a whole bunch of unit tests written in MbUnit and I would like to generate plain English sentences from test names. The concept is introduced here: http://dannorth.net/introducing-bdd This is from the article: public class CustomerLookupTest extends TestCase { testFindsCustomerById() { ... } testFailsForDuplicateCustomers() { ... } ... } renders something like this: CustomerLookup - finds customer by id - fails for duplicate customers - ... Unfortunately the tool quoted in the above article (testdox) is Java based. Is there one for .NET? Sounds like this would be something pretty simple to write, but I simply don't have the bandwidth and want to use something already written.

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• How are a session identifiers generated?

  - by Asaf R

  Most web applications depend on some kind of session with the user (for instance, to retain login status). The session id is kept as a cookie in the user's browser and sent with every request. To make it hard to guess the next user's session these session-ids need to be sparse and somewhat random. The also have to be unique. The question is - how to efficiently generate session ids that are sparse and unique? This question has a good answer for unique random numbers, but it seems not scalable for a large range of numbers, simply because the array will end up taking a lot of memory.

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• Are their any good way to genrate XML file through C# in .net

  - by steven spielberg

  i wanto make a xml file like <?xml version="1.0" encoding="Windows-1252" ?> <settings> <typeofsetting> <wordname="add" /> </typeofsettings> </settings> the wordname can be depend on what user need. how i can make a application that user can generate the XML file of thing they want. are their any good way to do this. the wordname not user defined it's come from database the application have inbuilt. are their any good practice to do this in c# win-forms.

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• Assigning a previous fieldvalue to a field in the next record

  - by user2945849

  I am working on a loan amortization schedule using Access, I have created the following tables: tblMembers - autoMemberID|txtLN|txtFN|etc tblLoans - autoLoanID|numMemberID|etc tblSchedules -autoScheduleID|numLoanID|numPayment#|datDue|dblBegin|...|dblEnd tblPayments - autoPaymID|numLoanID|curAmtPaid|datPaidDate and forms: frmLoans - autoLoanID|etc sbfSchedules - numPaymID|datDue|dblBegin|...|dblEnd sbfPayments - dblAmount|datPaid I have been able to generate the schedule (using DAO recordset) clicking a btnRepaymentSchedule the challenge is when I click a btnAddPayment still on the sbfSchedules, I want the value of the dblEnd field to be the value of the next record dblBegin field! I have tried using dlookup(txtBeginBalance = Dlookup("EndBalance", _ "Schedules","[ScheduleID] = Form![Schedules]![ScheduleID]-1) but there is no effect but if I use txtBeginBalance = txtEndBalance the value of txtEndBalance is assigned to the value of txtBeginBalance of the same record (want next record). Secondly, how can I set focus to the next record if a contro(txtAmountPaid) is not null on clicking the btnAddPayment or assigning the value of a calculation when the control is 0 or null ? Thanks

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• OpenSSL compatible API for Scala?

  - by pfleidi

  Hello, I'm working on a project with a friend. He's implementing his software in Ruby and I'm doing my stuff in Scala (with Lift). We're using some asynchronous encryption and he is using the ruby OpenSSL bindings for that: key = OpenSSL::PKey::RSA.generate(4096) self.public_key = key.public_key self.private_key = key What I'm looking for is a simple API which is compatible to OpenSSL and runs on the JVM. I need it to create key-pairs and to encrypt and sign our payload. Do you have any suggestions?

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