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• Library for Dataflow in C

  - by msutherl

  How can I do dataflow (pipes and filters, stream processing, flow based) in C? And not with UNIX pipes. I recently came across stream.py. Streams are iterables with a pipelining mechanism to enable data-flow programming and easy parallelization. The idea is to take the output of a function that turns an iterable into another iterable and plug that as the input of another such function. While you can already do this using function composition, this package provides an elegant notation for it by overloading the operator. I would like to duplicate a simple version of this kind of functionality in C. I particularly like the overloading of the operator to avoid function composition mess. Wikipedia points to this hint from a Usenet post in 1990. Why C? Because I would like to be able to do this on microcontrollers and in C extensions for other high level languages (Max, Pd*, Python). * (ironic given that Max and Pd were written, in C, specifically for this purpose – I'm looking for something barebones)

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• Compiler construction and DirectX

  - by otkins

  Hi! I am a beginner in the process of designing and coding a project, I already have all the ideas on my head, but I have a problem impeding me of continuing this project. I feel the code is ugly and unreadable and I cannot continue it this way. The project is a programming language I have on my mind, and it has small graphics capabilities. Even being beginner, I want to code it using DirectX because everybody wants it. And I want to code it entirely, not depend on any wrapper libraries like SDL. I did a refactoring of the DirectX module and it exposed all the weaks. There is Direct3D code everywhere, but the code itself does very little! I would start building a project like this using DirectX or I should use just GDI and the Multimedia API of Windows? This is a good progress for a beginner?

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• Laying out JPanels to make a simple GUI

  - by Elvis

  Hello, first of all, this is more or less my first GUI and ive learned Java for not more then a week, so it might contain some serious programming errors. What i have right now is: Buttons and labels are part of OptionPanel and are on the left, DrawingPanel is about 5x5 px in size and is on the right. What I am trying to do is a simple test, to get me more familiar with the GUI. The rectangle should be movable and re-sizeable by the user when clicking the respective buttons: http://www.upload.ee/image/612005/JFrame2.jpg Right now i have: JFrame MainFrame - Makes JFrame (Not using the setSize function. using .pack() instead. not sure about it) JPanel MergedPanel - FlowLayout - Adds JPanel OptionsPanel and JPanel DrawingPanel together and gets injected to JFrame MainFrame JPanel DrawPanel - This JPanel is responsible of drawing the rectangle. JPanel OptionPanel - FlowLayout - This JPanel is responsible of the buttons. Help please.

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• How do you manage battery health of your development devices when is always plugged in?

  - by Pentium10

  I know this question is not programming related, so for this I made community wiki. Developers are the best guys to answer the question. I am addressed to those that do development on devices that runs on batteries, like phones, gadgets etc. Probably you are constantly develop for them, and therefor they are always plugged in and charged at 100%. We develop mainly for smartphones and we have devices that were always above 90% charged in the last month or so. If a battery is always charged, it degrades it life cycle, so what steps you do to ensure decent battery drain to maximize the life of the batteries.

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• How to anti-alias the fonts in visual studio in windows forms application?

  - by user1781077

  i want my font to be anti aliased like this so that it looks more professionalenter link description heredoes any one know the code to anti alias the fonts so that the project looks more professional.tell me the code and where to insert it in the project.As of now the fonts looks jaggy the programming language is visual C# 4.0 .net and IDE is VS 2010 for example this is a label1 what do I need to insert to anti alias this.label1.AutoSize = true; this.label1.Font = new System.Drawing.Font("Segoe UI", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0))); this.label1.Location = new System.Drawing.Point(189, 187); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(31, 13); this.label1.TabIndex = 0; this.label1.Text = "from";

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• what good orm api will work well with scala or erlang

  - by Emotu Balogun

  I'm considering taking up scala programming but i'm really concerned about what will become of my ORM based applications. I currently use hibernate as my ORM and i find it a really reliable tool. I'd like to know if there's any ORM tool as efficient but written in scala, or will hibernate work seamlessly with it. i don't want to have to start writing endless sql queries again (like the days of JDBC). I also have the same thought about erlang. is there a good orm out there for erlang?? and can i use erlang with other DBMS like oracle and mysql with ORM

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• Xcode 3.2 not recompiling changed files

  - by Jason

  I've been programming a new iPhone application and everything has been chugging along fine, until this afternoon when I noticed that any changes I was making were not being reflected in the actual app! Even code that throws errors isn't getting picked up by the compiler. To get around this, I have taken to the following procedure: Finish making my edits, and add code to the file which will always throw a compiler error. Right-click the file I have just edited, and hit "Compile" to just compile that one file; it will throw the error. Remove the error-producing code, and again right-click and "Compile" the one file. Build the whole project This is quite annoying, and I can't figure out why this would suddenly happen to my Xcode project. Any thoughts on what could be causing this, and how to fix it?

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• scoket connection issue+php

  - by Abhimanyu

  Hi, I am using PHP socket programming and able to write data to open socket but i have to wait for a long time(or stuck it)for the response or some time getting error like "Maximum execution time of 30 seconds exceeded line number where this code is placed fgets($fp, 128), i have check the server it seems it has sent the response as expected but i am not getting why i m unable to get response.following the code using for socket connection and reading data. functon scoket_connection() { $fp = fsockopen(CLIENT_HOST,CLIENT_PORT, $errno, $errstr); fwrite($fp,$packet); $msg = fgets($fp, 128); fclose($fp) return $msg; } any idea???

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• Why isn't the eigenclass equivalent to self.class, when it looks so similar?

  - by The Wicked Flea

  I've missed the memo somewhere, and I hope you'll explain this to me. Why is the eigenclass of an object different from self.class? class Foo def initialize(symbol) eigenclass = class << self self end eigenclass.class_eval do attr_accessor symbol end end end My train of logic that equates the eigenclass with class.self is rather simple: class << self is a way of declaring class methods, rather than instance methods. It's a shortcut to def Foo.bar. So within the reference to the class object, returning self should be identical to self.class. This is because class << self would set self to Foo.class for definition of class methods/attributes. Am I just confused? Or, is this a sneaky trick of Ruby meta-programming?

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• Python recursive program

  - by mathboy

  I'm relatively newcomer on programming as I'm educated a mathematician and have no experience on Python. I would like to know how to solve this problem in Python which appeared as I was studying one maths problem on my own: Program asks a positive integer m. If m is of the form 2^n-1 it returns T(m)=n*2^{n-1}. Otherwise it writes m to the form 2^n+x, where -1 < x < 2^n, and returns T(m)=T(2^n-1)+x+1+T(x). Finally it outputs the answer.

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• grouping objects to achieve a similar mean property for all groups

  - by cytochrome

  I have a collection of objects, each of which has a numerical 'weight'. I would like to create groups of these objects such that each group has approximately the same arithmetic mean of object weights. The groups won't necessarily have the same number of members, but the size of groups will be within one of each other. In terms of numbers, there will be between 50 and 100 objects and the maximum group size will be about 5. Is this a well-known type of problem? It seems a bit like a knapsack or partition problem. Are efficient algorithms known to solve it? As a first step, I created a python script that achieves very crude equivalence of mean weights by sorting the objects by weight, subgrouping these objects, and then distributing a member of each subgroup to one of the final groups. I am comfortable programming in python, so if existing packages or modules exist to achieve part of this functionality, I'd appreciate hearing about them. Thank you for your help and suggestions.

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• Using UIImageViews for 'pages' in an iPhone/iPad storybook app?

  - by outtoplayinc

  I'm new to iPhone programming, and well, what seems obvious to me may seem silly to a seasoned coder. I did a few 'switching views' tutorials on Youtube, and basically, they seems to work nicely for adding pages to a storybook type app. You add a UIViewController and associated view for each page. My question is would this become insanely slow, or a memory hog if I continued this method for say....35+ pages? Each page would also have a sound file associated with it that would play narration when a page load and stops when we leave. Basically, think of a powerpoint type app, with sound, possibly animated image elements, next & back buttons. I'm probably thinking of this very simplistically, but that's where my experience is at for the moment. Any insight or tips as to better and or more efficient ways to proceed would be greatly appreciated.

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• How do I put a vector inside of a struct in Go?

  - by Brian T Hannan

  I'm trying to put a vector variable inside a struct in Google's Go programming language. This is what I have so far: Want: type Point struct { x, y int } type myStruct struct { myVectorInsideStruct vector; } func main(){ myMyStruct := myStruct{vector.New(0)}; myPoint := Point{2,3}; myMyStruct.myVectorInsideStruct.Push(myPoint); } Have: type Point struct { x, y int } func main(){ myVector := vector.New(0); myPoint := Point{2,3}; myVector.Push(myPoint); } I can get the vector to work in my main function just fine, but I want to encapsulate it inside a struct for easier use.

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• What are your experiences as a programmer?

  - by jenf

  I haven't finished school yet and plan on studying Informatics and searching a job as a programmer. However I don't know any real programmers and so I don't have a real source for information on how their job actually is. I apologize if this question is subjective but I think that it is an important one to ask. What do you actually program (with)? Do you generally work with one programming language or more? Do you like working with it/them? Do you like your job? Is it kind of a hobby and a job at once?

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• How compiling circular dependencies works?

  - by Fabio F.

  I've made the example in Java but I think (not tested) that it works in other (all?) languages. You have 2 files M.java that says public class MType{ XType x; MType(){ x = null;} } and another file XType.java (in the same directory) public class XType{ MType m; public XType(MType m){ this.m=m;} } Ok it's BAD programming , but.. if you run javac XType it compiles: compiles even MTypes because XType needs it. But.. MType needs XType.. how it works? How does the compiler know what is happening? Probably is a stupid question, but I would like to know how the compiler (javac or other compilers if you know.) manages that situation, not how to avoid it. I'm asking because i'm writing a precompiler and I would like to manage that situation.. Thank you

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• Deleting Part of An Array in Java to Free Memory on Heap

  - by kate

  I am implementing a dynamic programming algorithm for the knapsack problem in Java. I declare the array and then initialize its size to be [number of objects][capacity of knapsack]. When my number of objects or my capacity gets too large, I get a memory error because I run out of space on the heap. My questions is: If I delete rows from my double array as I go along, will Java free the memory as I delete? Or does Java reserve that memory space for the size of the array I originally created? If it's the latter, is there a way to manually free the memory in Java? Thanks for your Help!

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• extract and display contents of zip file in Adobe AIR. Urgent Please

  - by Fresher4Flex

  I have a requiremnt where my Air application loads ZIP files instead of swf. The zip contains all swf ,images and other files. My requirement is when user browses for file in a browse dialog, user selects a zip file and the contents of this zip file should be displayed to the user. i found examples to extract zip files, but i want to know how to read te contents and display them? i am not good at programming so can someone reply me Urgently here is the exaple to extract files http://pradeek.blogspot.com/2009/05/extracting-zip-files-in-adobe-air-with.html

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• What is your favorite Project Euler question?

  - by A. Rex

  I was searching around for questions related to Project Euler on Stack Overflow, and it seems that there were plenty of people asking about it, and even more people recommending it, whether for fun, to learn a new language, or to practice for interview questions. All this seems to imply to me that there are lots of people on SO that solve Project Euler problems now and then. I just started, so I was wondering: What was your favorite Project Euler question? Why? Did you think of a clever trick, or did you learn some new math, or did you discover a feature of a new programming language? (If possible, please include the actual question in your answer.)

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• What are 3 C++ language features you expect AFTER C++0x?

  - by Vicente Botet Escriba

  If I have understood well C++0x is now on a phase to resolve pending issues, so no new features will be added. What I want to know is what new features you want to have in C++ after C++0x is released. Just to give you an idea, I have added major existing proposal that could be included after C++0x: Concepts, Contract Programming, Garbage Collection, Macro scopes, Modules, Multimethods, Reflection Answer with your favorite feature if not already in an answer and up-vote them if already present. Be free to add other features not included on this list. Please don't include here libraries. Only core language features.

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• Need generated UML diagrams for C++ plugin modules

  - by archer1742

  I need various UML diagrams (sequence/collaboration, class, package, and system component) from some C++ files. However, these files are plugins in a larger programming framework. I have tried generating UML from Rational Rose 7 (2002 version), but I am not very experienced and I am unsure if RR simply cannot produce the diagram, I am doing something wrong, or the diagrams are not rendering correctly because the source files are plugins instead of standalone programs. I have also tried Star Modeler with little success and there seem to be no tutorials on how to generate these models. Is there a simple, bulletproof way to get UML diagrams for C++ files?

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• Is "}while(0);" always equal to "break;}while(1);" ?

  - by Hernán Eche

  I have compared gcc assembler output of do{ //some code }while(0); with do{ //some code break; }while(1); The output is equal, with or without optimization but.. It's always that way? No experiment can prove theories, they can only show they are wrong And because (I hope) programming is not an experimental science, and results can be predicted (at least simple things) I want to be sure next time I reeplace a break;}while(1); for the clearer (and less risky) while(0); Thank you for reading

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• Using custom HTML attributes for JavaScript purposes?

  - by user1103990

  One of my colleagues doesn't like to use HTML classes and ids for javascript/jQuery purpose. Therefore I've seen that he had created custom html attribute such as <div id="myid" class="cssClasses ..." [some-purpose-id]="mycustomId">...</div> I asked him if it was really a good idea and he replied that he considers that classes and Ids should be reserved for styling. Personally, I would have used classes. Some classes would have been used for styling, and some other classes would have been used for programming (jQuery selectors). The idea is to keep things appart also. And of course jQuery could set styling classes but if possible not use them for selection. Of course I also use id when appropriate but since an id is unique on a page, I like to do generic stuff using classes. I would like to know you opinions on the better approach (if there is one). Thank you.

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• How do I stop setNeedsDisplayInRect / drawRect coalescence?

  - by No One in Particular

  When programming my app, I get to the point where I have to update two rectangles on the screen. So I call [self setNeedsDisplayInRect:rect1] and then [self setNeedsDisplayInRect:rect2]. When my drawRect method is called, the rectangle parameter is the smallest rectangle which contains both rect1 and rect2. I can handle this with no problem, but when the two rectangles are far apart, then I am updating a lot of real estate with no gain. In this case, I would just like to repaint my two small rectangles. So my question is how can I prevent the underlying system from coalescing my two calls into one?

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• What's the most effective path to top level development?

  - by Glycerine

  I got a questions asked from one of my delegates the other day, "how did you get to where you are in programming?" I'm now at a java application realm - and I'm just about OK at it. the path that brought me there: BASIC VB6 PHP javascript actionscript java/objective-C I still live in the web development but I now prefer java - I see this as a good flow but I was wondering how you guys got to where you are and the best path to take? Edit: reword I guess I've asked the question wrong - I was wondering how to progress to a top level application from starting off in development. Where good paradyms connect languages. I won't have considered C++ as my first language see.

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• Should developers worry about ageism?

  - by Ubiguchi

  Having worked in software development for 12 years, I've recently started to worry about ageism in the industry. Seeing I'm not too bad at what I do I've never really worried about where my next job's going to come from, but the more I look around me the younger software developers seem to get. Although I feel I'm now at the top of my programming game, I have some management experience and I'm now wondering if I should make a fully-fledged leap from development to ensure future career security. I know ageism has traditionally be linked with the IT industry, but given modern employment law makes discrimination illegal, is ageism still a real problem for software developers? Or are my aging neurons deluding me?

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