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• MIPS processors : Are they still in use? Which other architecture should I learn?

  - by claws

  I've been programming for x86 & x86-64 in assembly language for few months. Now, I want to move on to some different kind of processors. MIPS, SPARC, PowerPC, Itanium, ARM of these I found ARM is being widely use. But the books I see that tutorials & books teach about MIPS more than all these other architectures. Why is MIPS so popular? Are MIPS processors still in use? Which architecture should I go for?

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• Resources for UnrealScript

  - by Blaenk

  Now that the Unreal Development Kit is out and free to use by anyone, I am pretty excited to try it out. My understanding is that the programming is done through scripting in UnrealScript, I am wondering if any of you guys know of any good articles, tutorials, books, and references for Unreal Script or the Unreal Development Kit. Documentation UnrealScript Reference for Unreal Engine 3 UnrealScript at UnrealWiki Tools nFringe - Visual Studio Extension for UnrealScript Setting up an nFringe UDK project Tutorials Chimeric - Coding tutorials Video Tutorials 3D Buzz Video Tutorials Sorry if I screwed up on this. It's my first community wiki post, let me know if I did something wrong :)

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• Cocoa: getting a Table View cell to send action messages

  - by underthetable

  I'm really having trouble getting a Cocoa Table View cell to send action messages. At the most basic level, in IB there is an action assigned for the NSTextViewCell object, and after editing and pressing Return nothing happens. So I have an IBOutlet hooked up to the NSTextViewCell, and have been experimenting with NSActionCell messages to it. But the Table View seems to pretty much just ignore them. I've also tried subclassing NSTextViewCell, but the methods I'm seeing all look like they want to pass values to the object from somewhere, not return a value from inside the object to configure its behavior. I'm pretty new to programming and Cocoa -- can someone explain each thing that needs to be overridden and how and where to do it?

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• Etiquette for refactoring other people's sourcecode?

  - by Prutswonder

  Our team of software developers consists of a bunch of experienced programmers with a variety of programming styles and preferences. We do not have standards for everything, just the bare necessities to prevent total chaos. Recently, I bumped into some refactoring done by a colleague. My code looked somewhat like this: public Person CreateNewPerson(string firstName, string lastName) { var person = new Person() { FirstName = firstName, LastName = lastName }; return person; } Which was refactored to this: public Person CreateNewPerson (string firstName, string lastName) { Person person = new Person (); person.FirstName = firstName; person.LastName = lastName; return person; } Just because my colleague needed to update some other method in one of the classes I wrote, he also "refactored" the method above. For the record, he's one of those developers that despises syntactic sugar and uses a different bracket placement/identation scheme than the rest of us. My question is: What is the (C#) programmer's etiquette for refactoring other people's sourcecode (both semantic and syntactic)?

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• cannot find vcvarsall.bat when runnning a pyhton script

  - by Ariel

  hello all, i am working on vista, and using python 2.6.4. i am using a software which uses a python script. but then i bumped into the message "cannot find vcvarsall.bat". so i installed visual c++ 2010. still the file is not found though it is there. my guess (a very uneducated one...) is that somewhere the path is wrong, because i also have an old visual 2008 (pretty empty) folder. since i have little idea in programming i have no idea where to make the changes for the new path. do i change something in the registery or in the script. i would be happy if somebody could help (preferably in lamen terms). thanx. Ariel

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• Web Page Rendering Capture

  - by Chaitanya

  I start with describing the problem itself. Rather than a problem I'm looking for a better solution. I have a asp.net page which has a bunch of images and a link underneath it, Each image is infact the latest rendering of the link underneath it. I scheduled a bat script which runs every hour to fetch the images through IECapt a web page rendering capture utility. One thing am annoyed about this utility is it takes a lot of time for the 20 images I have and for few because of the flash content it misses to take the actual screenshot of the website. Now I like to know can this rendering be done by traditional programming am not interested in using any utilities. I'm interested in trying this. The solution need not be necessarily a C# based am ready to try in any other language. Because it gives me a chance to learn. Thank you.

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• What's wrong with the analogy between software and building construction?

  - by kuosan

  Many people like to think of building software as constructing a building so we have terms like building blocks and architecture. However, lately I've been to a couple of talks and most people say this analogy is wrong especially around the idea of having a non-coding software architect in a project. In my experience, good software architects are those who also write code so they won't design things that only looks good on paper. I've worked with several Architecture Astronauts, who have either limited or outdated experience in programming. These architecture astronauts quite often missed out critical details in their design and cause more harm than good in a project. This makes me wonder what are the differences between constructing a software and a building? How come in the building industry they can have architects who probably never build a house in their life and purely handles design work but not in the software development field?

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• Throwing a new exception while throwing an old exception

  - by FredOverflow

  If a destructor throws in C++ during stack unwinding caused by an exception, the program terminates. (That's why destructors should never throw in C++.) If a finally block is entered in Java because of an exception in the corresponding try block and that finally block throws another exception, the first exception is silently swallowed. This question crossed my mind: Could a programming language handle multiple exceptions being thrown at the same time? Would that be useful? Have you ever missed that ability? Is there a language that already supports this? Is there any experience with such an approach? Any thoughts?

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• Python 2.7 - Help using an API (HL7)

  - by atomicluis

  I am new to programming and Python. I have a very basic python script that connects to server and send a text message: #!/usr/bin/python import socket s = socket.socket() host = '127.0.0.1' port = 4106 s.connect((host, port)) message = 'test1' s.send(message) print s.recv(1024) s.close Everything is fine, except that this message is an HL7 message and needs to wrapped in MLLP I found this API that I think can do this for me (http://python-hl7.readthedocs.org/en/latest/api.html#mllp-network-client) So I modified my program to the following, but I keep getting the error message: NameError: name 'MLLPClient' is not defined #!/usr/bin/python import socket import hl7 host = '127.0.0.1' port = 4106 with MLLPClient(host, port) as client: client.send_message('test1') print s.recv(1024) s.close Thanks in advanced for all the help

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• Determining default character set of platform in Java

  - by Anand

  I am programming in Java I have the code as: byte[] b = test.getBytes(); In the api it is specified that if we do not specify character encoding it takes the default platform character encoding. What is meant by "default platform character encoding" ? Does it mean the Java encoding or the OS encoding ? If it means OS encoding the how can i check the default character encoding of Windows and Linux ? Is there anyway we can get the default character encoding using command line ?

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• Code editor skins?

  - by Khalspi

  This is a kind of unorthodox question. Frankly, I won't lie to you. I am new to programming and am planning to improve myself. I enjoy coding but I need something to keep me going during the down times, so my question is: Is there such a thing as a code editor skin? A compiler skin? For example, you have the Command Prompt, it has a black background with white writing, it seems geeky, exactly what I want. I want a compiler that looks like command prompt...black with white writing (or green) or still has color coding (some compilers change color of text based on command). Yes, this is mainly for boasting, but I don't want to show someone something that basically looks like a text editor, I just want something that looks a little cooler. P.S (This question may seem a little unnecessary, it is because it is my first question, I'd like to warm up to this community before I start asking some real questions about code.)

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• Asynchronous operations performance

  - by LicenseQ

  One of the features of asynchronous programming in .NET is saving threads during long running operation execution. The FileStream class can be setup to allow asynchronous operations, that allows running (e.g.) a copy operation without virtually using any threads. To my surprise, I found that running asynchronous stream copy performs not only slower, but also uses more processing power than synchronous stream copy equivalent. Is there any benchmark tests were done to compare a synchronous vs asynchronous operation execution (file, network, etc.)? Does it really make sense to perform an asynchronous operation instead of spanning separate thread and perform synchronous operation in server environment if the asynchronous operation is times slower than the synchronous one?

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• How to create my own recommendation engine?

  - by Burak Dede

  i am intrested in recommendation engines these days and i wanna improve myself in this area.I am currently reading Programming Collective Intelligence (i think this is the best book about this subject) from OReilly (just started).But i dont have any ideas how to implement engine(what i mean by no idea dont know how to start).Lets say i have project like LastFM in my mind where do (should be implemented on database side or backend side)i start creating recommnedation engine? what level database knowledge will needed? is there any open source ones that can be used for help or any resource? what should be the first steps that i have to do?

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• Best non-development book for software developers

  - by Dima Malenko

  What is the best non software development related book that you think each software developer should read? Note, there is a similar, poll-style question here: What non-programming books should programmers read? Update: Peopleware is a great book, must read, no doubt. But it is about software development so does not count. Update: We ended up suggesting more than one book and that's great! Below is summary (with links to Amazon) of the books you should consider for your reading list. The Design of Everyday Things by Donald Norman Getting Things Done by David Allen Godel, Escher, Bach by Douglas R. Hofstadter The Goal and It's Not Luck by Eliyahu M. Goldratt Here Comes Everybody by Clay Shirky ...to be continued.

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• Create a permalink with Javascript

  - by Jon Romero

  I have a textbox where a user puts a string like this: "hello world! I think that __i__ am awesome (yes I am!)" I need to create a correct url like this: hello-world-i-think-that-i-am-awesome-yes-i-am How can be done using reg expressions? Also, is it possible to do it with Greek (for example)? "Ge?a s?? ??sµe" turns to geia-sou-kosme In other programming languages (python/ruby) I am using a translation array. Should I do the same here?

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• Ruby Summer of Code Project Ideas

  - by blatyo

  So, I'm thinking about applying for Ruby Summer of Code. However, I'm not sure what I want to propose. I was wondering if any of my fellow redditors had any good ideas? I've been programming in Ruby for about 3 years. I am primarily a web developer, but I do things related to bit torrent, data mining, and databases as well. I have a bit torrent related gem that I wrote for the hell of it. I've also got some projects on Github (username: blatyo). I am looking for ideas for me, but anything you can think of that would be awesome I would like to hear as well.

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• Seeking enlightenment - global variables in AppEngine (aeoid.get_current_user())

  - by jerd

  Hello This may be a 'Python Web Programming 101' question, but I'm confused about some code in the aeoid project (http://github.com/Arachnid/aeoid). here's the code: _current_user = None def get_current_user(): """Returns the currently logged in user, or None if no user is logged in.""" global _current_user if not _current_user and 'aeoid.user' in os.environ: _current_user = User(None, _from_model_key=os.environ['aeoid.user']) return _current_user But my understanding was that global variables were, ehm, global! And so different requests from different users could (potentially) access and update the same value, hence the need for sessions, in order to store per-user, non-global variables. So, in the code above, what prevents one request from believing the current user is the user set by another request? Sorry if this is basic, it's just not how i thought things worked. Thanks

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• MVC with cocoa/objective-c

  - by Leonardo

  Hi all, I have a strong j2ee background, and I am trying to move to objective-c for some desktop/iphone programming. I used many java web frameworks with mvc in mind, spring and struts ecc... so I am used to have servlet or controller which pass attributes to jsp pages, which is the view. In jsp pages with jstl you can call this attribute and render to video. In this way controller and view are (in theory) clearly separated. With xcode, I can easily recognize the controller and the view built with IBuilder. All the tutorial I found, shown the controller which go and change directly labels or text fields. So my two questions: seems to me that there's no separation between the two (controller and view), where I am wrong in that ? is there a way for a controller to pack all objects in a kind of context in a j2ee way and have the view read that context ? thanks Leonardo

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• Error Domain=SKErrorDomain Code=3 UserInfo=0x2a5a00 "Cannot connect to iTunes Store"

  - by SKk

  I am trying to implement InApp purchase in my application. I have implemented it as per Apple's programming guide and it(code) was working fine until I created new application, appid, provisioning profile and in-app products @ another developer account. Now, it gives me following error. Error Domain=SKErrorDomain Code=3 UserInfo=0x2a5a00 "Cannot connect to iTunes Store" Same code works fine if I use previous developer account's appid, pro-certificate and product ids. This is very strange issue, I double checked product id names and other things still facing same error. Any clue..?

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• Roadblocks in creating a custom operating system

  - by Dinah

  It seems to me that the most common overly ambitious project that programmers (esp. Comp. Sci. grads) try to tackle is building your own operating system. (Trying to create your own programming language + compiler is probably even more common but not nearly as ambitious.) For those (like myself) foolish enough to try: aside from the sheer size, what are the biggest *gotcha*s or unexpected roadblocks you've encountered in trying to create your own OS from the ground up? Edit: A great OS question: http://stackoverflow.com/questions/43180/how-to-get-started-in-operating-system-development/

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• append a numpy array to a numpy array

  - by Fraz

  I just started programming in python and am very new to numpy packages.. so still trying to get a hang of it. I have a an numpy_array so something like [ a b c] And then I want to append it into anotehr numpyarray (Just like we create a list of lists) How do we create an array of numpy arrays containing numpy arrays I tried to do the following without any luck >>> M = np.array([]) >>> M array([], dtype=float64) >>> M.append(a,axis=0) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'numpy.ndarray' object has no attribute 'append' >>> a array([1, 2, 3])

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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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• The Zen of Python distils the guiding principles for Python into 20 aphorisms but lists only 19. What's the twentieth?

  - by Jeff Walden

  From PEP 20, The Zen of Python: Long time Pythoneer Tim Peters succinctly channels the BDFL's guiding principles for Python's design into 20 aphorisms, only 19 of which have been written down. What is this twentieth aphorism? Does it exist, or is the reference merely a rhetorical device to make the reader think? (One potential answer that occurs to me is that "You aren't going to need it" is the remaining aphorism. If that were the case, it would both exist and act to make the reader think, and it would be characteristically playful, thus fitting the list all the better. But web searches suggest this to be an extreme programming mantra, not intrinsically Pythonic wisdom, so I'm stumped.)

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• Language Design: Combining Gotos and Functions

  - by sub

  I'm designing and currently rethinking a low-level interpreted programming language with similarities to assembler. I very soon came across the functions/loops/gotos decision problem and thought that while loops like while and for would be too high-level and unfitting, gotos would be too low level, unmaintainable and generally evil again. Functions like you know them from most languages that have return values and arguments aren't fitting in the language's concept either. So I tried to figure out something between a function and a goto which is capable of Recursion Efficient loops After some thinking I came up with the idea of subroutines: They have a beginning and an end like a function They have a name but no arguments like a goto You can go into one with jump and go out of it again before its end with return (doesn't give back any result, only stops the subroutine) Handled just like normal code - Global scope like goto So I wanted to know: Is the idea above good? What are the (dis)advantages? Would there be a better combination of function and goto or even a completely new idea?

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• Resizing screenshots/screen captures for inclusion in Beamer

  - by Stephen

  Sorry, this may or may not be a programming question directly, but I am trying to resize screenshots with Imagemagick and Gimp to include in a Beamer presentation, but it comes out even blurrier than the resizing done by LaTeX. For instance, in Beamer I might have a command to rescale the image \includegraphics[width=.5\textwidth]{fig.png}. Using something like \begin{frame} \message{width = \the\textwidth} \message{height = \the\textheight} \end{frame} I have gotten the \textwidth and \textheight parameters in points (345.69548, 261.92444). So I have a script (in Python) that sends a system call to Imagemagick: 'convert %s -resize %.6f@ resized_%s' % (f,a,f) where a is calculated as \textwidth*\textheight*0.5**2. When I then go back into my Beamer presentation and include the resized figure, \includegraphics{resized_fig.png}, the size looks approximately correct but it's super-blurry. I also tried resizing in Gimp (using the GUI) but no luck either... help? Thanks...

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