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• Clojure editor/IDE recommendations on OS X

  - by Julien Chastang

  I am starting to learn the Clojure programming language. Are there any recommendations for Clojure editors/IDEs on OS X? Update 2009-9-23: The clojure space has changed tremendously since I originally posted this question. Many of the links below, especially those that refer to clojure-mode with emacs, are out-of-date. The best clojure IDE I found was the enclojure Netbeans plugin which was recently released (2009-08-25). Update 2010-4-30: Here is another very good link on this subject by Lau B. Jensen. Also, for my own clojure development, I have actually moved to emacs / swank-clojure.

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• How to use Private Inheritence aka C++ in C# and Why not it is present in C#

  - by Vijay

  I know that private inheritance is supported in C++ and only public inheritance is supported in C#. I also came across an article which says that private inheritance usually defines a HAS-A relationship and kind of an aggregation relationship between the classes. EDIT: C++ code for private inheritance: The "Car has-a Engine" relationship can also be expressed using private inheritance: class Car : private Engine { // Car has-a Engine public: Car() : Engine(8) { } // Initializes this Car with 8 cylinders using Engine::start; // Start this Car by starting its Engine }; Now, Is there a way to create a HAS-A relationship between C# classes which is one of the thing that I would like to know - HOW? Another curious question is why doesn't C# support the private (and also protected) inheritance ? - Is not supporting multiple implementation inheritance a valid reason or any other? Is private (and protected) inheritance planned for future versions of C#? Will supporting the private (and protected) inheritance in C# make it a better and widely used language?

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• Is there anything RAD comparable to VCL?

  - by mawg

  After years in embedded programming, I have to develop a Windows app. I dug out my old C++ Builder and Delphi. These are great and the latest version costs over $1k, so I won't be going there. What I prarticularly like is the VCL (visual component library) which let's me code my own components and share them with others, plus the thousands of existing 3rd party components. I noticed that there is now also a RAD PHP from Borland too. I realzie that MSVC, QT, NetBeans, etc are good enough IDEs for RAD, BUT does anything offer the ease of the Borland products for developing additional components - and does anything else have thousands to choose from? PC based? Cross-platform is good. Browser based? Free is always good ;-) I don't particularly care about the programming language.

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• Career advice for a frustrated newbie programmer.

  - by Satoru.Logic

  Hi, all. This is my first year as a programmer. The programming language that I'm most familiar with is Python. I am maintaining a web2py based legacy system, alone, which means I have to grow up as an all-rounder. The original programmers on this project are nowhere to find, and there are hardly any usable documents about requirements or anything. I find it very frustrating every time I hear the users criticize the system, and I can't help explaining that "that was not my fault, those mess was there even before I entered this company." I wonder what should I do with this situation. Please give me some advice, thanks in advance.

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• Covariance and Contravariance on the same type argument

  - by William Edmondson

  The C# spec states that an argument type cannot be both covariant and contravariant at the same time. This is apparent when creating a covariant or contravariant interface you decorate your type parameters with "out" or "in" respectively. There is not option that allows both at the same time ("outin"). Is this limitation simply a language specific constraint or are there deeper, more fundamental reasons based in category theory that would make you not want your type to be both covariant and contravariant? Edit: My understanding was that arrays were actually both covariant and contravariant. public class Pet{} public class Cat : Pet{} public class Siamese : Cat{} Cat[] cats = new Cat[10]; Pet[] pets = new Pet[10]; Siamese[] siameseCats = new Siamese[10]; //Cat array is covariant pets = cats; //Cat array is also contravariant since it accepts conversions from wider types cats = siameseCats;

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• Cross Platform Tips, Tricks & Gotchas

  - by codeelegance

  If you've worked on a cross platform development project: What did you learn from the experience? What worked? What didn't? What problems did you run into and how did you solve them? Did you aim for consistent appearance and functionality across all platforms or try to take advantage of each platform's strengths? What language and cross platform libraries did you use and did they live up to their claims? Was it a desktop application or web-based?

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• plpgsql function to generate random readable strings

  - by Peter

  Hi I have written the following function but it's isn't returning anything when I run it. Can somebody help identify the issue? CREATE OR REPLACE FUNCTION GenerateReadableRandomString ( len INT ) RETURNS varchar AS $$ DECLARE validchars VARCHAR; randomstr VARCHAR; randint INT; i INT; BEGIN validchars := 'ABCEFHJKLMNPRTWXY3478'; i := 0; LOOP randint := ceil(random() * char_length(validchars)); randomstr := randomstr || substring(validchars from randint for 1); i := i + 1; EXIT WHEN i = len; END LOOP; RETURN randomstr; END; $$ LANGUAGE plpgsql;

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• How to create playable FLV video from part of FLV file using FFMPEG?

  - by Ole Jak

  So we had real FLV video file. we had devided it into 3 parts (more or less equal, not looking into structure orcontext). We have taken second part and forgot about first 2. Video contained audio and video track. mp3 and on vp6. Is it any how possible to play thsat second part after sending to ffmpeg some command? So how to (using any FFMPEG API (in general in any programming language) or using command line) turn bytearray into playable video? (knowing what format video was created in and some other data like used codecs )

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• Python 'datetime.datetime' object is unsubscriptable

  - by Robert

  First, I am NOT a python developer. I am trying to fix an issue within a python script that is being executed from the command line. This script was written by someone who is no longer around, and no longer willing to help with issues. This is python 2.5, and for the moment it cannot be upgraded. Here are the lines of code in question: start_time = datetime.strptime(str(paf.Start),"%Y-%m-%d %H:%M:%S") dict_start = datetime(*start_time[:6]) end_time = datetime.strptime(str(paf.End),"%Y-%m-%d %H:%M:%S") dict_end = datetime(*end_time[:6]) When this code is ran, it generates an error with the description: 'datetime.datetime' object is unsubscriptable. This is the import statement: from datetime import datetime I have a feeling that this is something simple, but not being my native language and Google not yielding any valuable results, I am stuck. I have tried a couple of different import methods, yielding different errors, but all with these statements. Any help on this would be greatly appreciated.

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• TimeSpan to Localized String in C#

  - by MadBoy

  Is there an easy way (maybe built in solution) to convert TimeSpan to localized string? For example new TimeSpan(3, 5, 0); would be converted to 3 hours, 5minutes (just in polish language). I can of course create my own extension: public static string ConvertToReadable(this TimeSpan timeSpan) { int hours = timeSpan.Hours; int minutes = timeSpan.Minutes; int days = timeSpan.Days; if (days > 0) { return days + " dni " + hours + " godzin " + minutes + " minut"; } else { return hours + " godzin " + minutes + " minut"; } } But this gets complicated if i want to have proper grammar involved.

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• Looking for calculator source code, BSD-licensed

  - by Horace Ho

  I have an urgent project which need many functions of a calculator (plus a few in-house business rule formulas). As I won't have time to re-invent the wheel so I am looking for source code directly. Requirements: BSD licensed (GPL won't help) in c/c++ programming language 32-bit CPU minimum dependency on platform API/data structure best with both RPN and prefix notation supported emulator/simulator code also acceptable (if not impossible to add custom formula) with following functions (from wikipedia) Scientific notation for calculating large numbers floating point arithmetic logarithmic functions, using both base 10 and base e trigonometry functions (some including hyperbolic trigonometry) exponents and roots beyond the square root quick access to constants such as pi and e plus hexadecimal, binary, and octal calculations, including basic Boolean math fractions optional statistics and probability calculations complex numbers programmability equation solving

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• jquery animate and image resize flickering

  - by denadai2

  Hi, i've a problem with a resize effect that i've done in http://www.mcz-scenario.it. When you click on a language, you can see the "background" image transferring into a certain position of the screen. this is the image: <img id="lago" src="http://www.mcz-scenario.it/images/lago.jpg" height="1070" width="1600" alt="lago" /> And this is the "resize" effect $("#lago").animate({ height: 148, width: 264, top: endPosition2.top+42, left: endPosition2.left+350+26}, 4000); Now... I see some flickering running this animation in Firefox. How can i handle this? Is it normal because the image is too large? Help me please :( THX

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• .net multilingual cms

  - by Adam

  i am planning a simple, dual-language website and i'd like to use a .net based cms but i can't find anything suitable. i have experience with dotnetnuke and sharepoint but neither fit the bill - dotnetnuke does not do dynamic site elements multi-lingually & sharepoint is a monster PITA no matter what angle you look at it :). i am on the verge of choosing Joomla! & Joom!Fish. they fit the bill nicely, with one exception: i would like to create some cms plug-ins and i would much prefer to write them in .net. any suggestions?

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• How to detect defunct processes on Linux?

  - by Hakan

  I have a parent and a child process written in C language. Somewhere in the parent process HUP signal is sent to the child. I want my parent process to detect if the child is dead. But when I send SIGHUP, the child process becomes a zombie. How can I detect if the child is a zombie in the parent process? I try the code below, but it doesn't return me the desired result since the child process is still there but it is defunct. kill(childPID, 0); One more question; can I kill the zombie child without killing the parent? Thanks.

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• Superfluous python parameters

  - by Leif Andersen

  I've noticed a discrepancy in the way that python parameters are called. In every other language I've dealt with, you either have foo() meaning either no parameters, or as many parameters as you like, or foo(arg1, arg2,...,argn) where you pass in the same number of parameters to define the function and call it. In python however, I've noticed that the function definitions, and when the function is called, can have two different parameters sets, this usually consists of: class foo(object): def bar(self, arg1, arg2): pass However, when I want to call the function, all I have to do is: zoo = foo() zoo.bar(arg1, arg2) Where did the self parameter go? Thank you.

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• Libreoffice Calc run macro with HYPERLINK

  - by Kurt Borno

  I'm trying to use hyperlinks instead of buttons to run Basic macros. It seems to be more natural to me because hyperlinks are directly connected to a cell and buttons are not. I'm using the following Formula: =HYPERLINK("vnd.sun.star.script:Standard.Module1.Test?language=Basic&location=document";"Check") It should call the Subroutine Test placed in the document's macros under Standard.Module1 and display the Text 'Check' in the Cell it is written. This works absolutely fine with libreoffice 3.6.1.2 but it doesn't work at all with version 4.1.4.2. I can't see any errors it just happens nothing at all. I tried to simply click the Hyperlink and also to hold CTRL and click it. Same result - nothing. When I use a button the macro works as expected. Does anyone know how to solve this problem?

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• Gantt Chart online

  - by Luca

  I need to insert a horizontal bar chart in a web page. The thing I have to do is very similar to a Gantt Chart. I'd like to use a javascript library for the purpose. I tried jsgantt, but actually it is not very beautiful. I could evaluate also a server generation of the graph. In case my server side language is Python. It will be part of an internal project with no internet access, so Google Charts isn't an option.

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• Python 3: unpack inner lists in list comprehension

  - by Beau Martínez

  I'm running the following code on a list of strings to return a list of its words: words = [re.split('\\s+', line) for line in lines] However, I end up getting something like: [['import', 're', ''], ['', ''], ['def', 'word_count(filename):', ''], ...] As opposed to the desired: ['import', 're', '', '', '', 'def', 'word_count(filename):', '', ...] How can I unpack the lists re.split('\\s+', line) produces in the above list comprehension? Naïvely, I tried using * but that doesn't work. (I'm looking for a simple and Pythonic way of doing; I was tempted to write a function but I'm sure the language accommodates for this issue.)

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• Does JSONP scale? How many JSONP requests can I send?

  - by Cheeso

  Based on Please explain JSONP, I understand that JSONP can be used to get around the same-origin policy. But in order to do that, the page must use a <script> tag. I know that pages can dynamically emit new script tags, such as with: <script type="text/javascript" language='javascript'> document.write('<script type="text/javascript" ' + 'id="contentloadtag" defer="defer" ' + 'src="javascript:void(0)"><\/script>'); var contentloadtag=document.getElementById("contentloadtag"); contentloadtag.onreadystatechange=function(){ if (this.readyState=="complete") { init(); } } </script> (the above works in IE, don't think it works in FF). ... but does this mean, effectively, that every JSONP call requires me to emit another <script> tag into the document? Can I remove the <script> tags that are done?

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• Is there any difference between null and 0 when assigning to pointers in unsafe code?

  - by Eloff

  This may seem odd, but in C (size_t)(void*)0 == 0 is not guaranteed by the language spec. Compilers are allowed to use any value they want for null (although they almost always use 0.) In C#, you can assign null or (T*)0 to a pointer in unsafe code. Is there any difference? (long)(void*)0 == 0 (guaranteed or not? put another way: IntPtr.Zero.ToInt64() == 0) MSDN has this to say about IntPtr.Zero: "The value of this field is not equivalent to null." Well if you want to be compatible with C code, that makes a lot of sense - it'd be worthless for interop if it didn't convert to a C null pointer. But I want to know if IntPtr.Zero.ToInt64() == 0 which may be possible, even if internally IntPtr.Zero is some other value (the CLR may or may not convert null to 0 in the cast operation) Not a duplicate of this question

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• Commands to compile programs on Windows

  - by Arjun Vasudevan

  In case I have .NET framework installed in my computer + all the necessary other language support (Perl Interpreter, etc) What are the commands I should give in the console to compile programs in the following languages: 1. C 2. C++ 3. Java 4. Python 5. VB 6. C# 7. Perl 8. Ruby Like we have for VB- *vbc program_name.vb*, what are the commands to compile programs in other languages?

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• Scintilla custom syntax highlighting not working

  - by Nilbert

  I have a Scintilla control that I create in C#, and the syntax highlighting doesn't work. It sets the font correctly which tells me that the file is being loaded, but the syntax highlighting doesn't work at all: Scintilla r = new Scintilla(); r.Dock = DockStyle.Fill; r.ConfigurationManager.IsUserEnabled = true; r.ConfigurationManager.CustomLocation = "langs.xml"; r.ConfigurationManager.Language = "rb"; r.Margins[0].Width = 40; r.Indentation.UseTabs = true; r.Indentation.IndentWidth = 4; r.Indentation.ShowGuides = true; r.Indentation.TabIndents = true; r.Indentation.TabWidth = 4; r.Indentation.SmartIndentType = SmartIndent.Simple; and the configuration file is this: http://codepad.org/DAjCrlPT in langs.xml. (The code won't fit here.) Can someone tell me why this is not working?

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• Web framework for an application utilizing existing database?

  - by tputkonen

  A legacy web application written using PHP and utilizing MySql database needs to be rewritten completely. However, the existing database structure must not be changed at all. I'm looking for suggestions on which framework would be most suitable for this task? Language candidates are Python, PHP, Ruby and Java. According to many sources it might be challenging to utilize rails effectively with existing database. Also I have not found a way to automatically generate models out of the database. With Django it's very easy to generate models automatically. However I'd appreciate first hand experience on its suitability to work with legacy DBs. Also I appreciate suggestions of other frameworks worth considering.

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• Needed list of special characters classification with respective characters

  - by pravin

  I am working on one web application , It's related to machine translation support i.e. which takes source text for translation and translated in to user specified language Currently it's in unit testing phase. Here, i want to check that, whether my machine translation feature is fully working for all the special characters. Because of different test cases I stuck at one point where i need all the special characters with classification. I needed all the special characters listing with classification. e.g. 1st : class name : Punctuation Characters : !?,"| etc test cases : segment1? segment2! segment3. 2nd : Class name : HTML entities characters : all the characters which belong under this class test cases : respective test cases 3rd : Class name : Extended ASCII characters :all the characters which belong under this class test cases : respective test cases Please folks provide this, if anyone has any idea or links so that i can make product perfect Thanks a lot

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• Objective-c string appending causes exception

  - by Dave C

  Hello Everyone, The following code is causing me some problems. The third line causes a program crash... it doesn't happen the first time I step through but somehow later on in the program. If I comment out that third line, the program runs smoothly. NSString *myRequestString = @"text"; int i = 1; myRequestString = [myRequestString stringByAppendingString:[NSString stringWithFormat: @"t=%d", i]]; That code causes this exception: * -[CFString release]: message sent to deallocated instance 0xb4c43fe0 On a side note, can anyone tell me how to concatenate strings in objective-c like any other normal language... I can't believe that there is no concatenation operator. Any and all help is greatly appreciated.

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