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• Javascript clarity of purpose

  - by JesDaw

  Javascript usage has gotten remarkably more sophisticated and powerful in the past five years. One aspect of this sort of functional programming I struggle with, esp with Javascript’s peculiarities, is how to make clear either through comments or code just what is happening. Often this sort of code takes a while to decipher, even if you understand the prototypal, first-class functional Javascript way. Any thoughts or techniques for making perfectly clear what your code does and how in Javascript? I've asked this question elsewhere, but haven't gotten much response.

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• Programmatically create static arrays at compile time in C++

  - by Hippicoder

  One can define a static array at compile time as follows: const std::size_t size = 5; unsigned int list[size] = { 1, 2, 3, 4, 5 }; Question 1 - Is it possible by using various kinds of metaprogramming techniques to assign these values "programmatically" at compile time? Question 2 - Assuming all the values in the array are to be the same barr a few, is it possible to selectively assign values at compile time in a programmatic manner? eg: const std::size_t size = 7; unsigned int list[size] = { 0, 0, 2, 3, 0, 0, 0 }; Solutions using C++0x are welcome The array may be quite large, few hundred elements long The array for now will only consist of POD types It can also be assumed the size of the array will be known beforehand, in a static compile-time compliant manner. Solutions must be in C++ (no script or codegen based solutions)

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• DllImport Based on OS Platform

  - by Ngu Soon Hui

  I have a mixture of unmanaged code ( backend) and managed code ( front end), as such, I would need to call the unmanaged code from my managed code, using interop techniques and DllImport attribute. Now, I've compiled two versions of unmanaged code, for both 32 and 64 bit OS; they are named service32.dll and service64.dll respectively. So, in my .Net code, I would have to do a DllImport for both dlls: [DllImport(@"service32.dll")] //for 32 bit OS invocation public static void SimpleFunction(); [DllImport(@"service64.dll")] //for 64 bit OS invocation public static void SimpleFunction(); And call them depending on which platform my application is running on. The issue now is that for every unmanaged function, I have to declared it twice, one for 32 bit OS and one for 64 bit OS. This is a duplication of work, and everytime I change the signature of an unmanaged function, I have to modified it in two places. Is there anyway that I can change the argument in DllImport so that the correct dll will be invoked automagically, depending on the platform?

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• Browser application & local file system access

  - by Beyond HTML

  I want to enhance my browser-based web application with functionality that enables management of local files and folders. E.g. folder tree structures should be synchronized between local workstation and server via HTTP(S). I am aware of security-related limitations in browser-based applications. However, there are some techniques that "work around" these issues: Signed Java applets (full trust) .NET Windows Forms browser controls (no joke, that works. Just the configuration is horrible) ActiveX My question is: What do you use/suggest, both technology and implementation practice? Key requirement is that the installation process is as simple as possible. Thanks for your opinions!

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• Website using open source Forums,Wikis and CMS (Single site)

  - by Daksh

  Hi, I want to develop a site using all three FOSS i.e. Forum,wikis and CMS.But i have few doubts. 1.Can you suggest which is the best software for each of the three(Forum,wikis and CMS).? 2.How should i make the front end preferably(i.e should i use Dreamweaver or just use the CMS for the front end too) 3.How do i integrate all the three(CMS,Forum and Wiki) into a single website. 4.Should i make my own CMS? 5.Site popularity and monetary techniques which really works. Please provide detailed explanations for your answers. Thanks in advance, Cheers!

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• Which langauge should i use for Artificail intelligence on web projects

  - by Mirage

  I have to do one project for my thesis involving Artificail intelligence , collaborative filtering and machine learning methods. I only know PHP/mysq/JS and there is not much AI stuff examples in PHP. There are some books on AI on internet but they use Java , Python. Now i have to apply AI techniques on web application. WHich language should i choose java or python. I searhed on internet that i can call java classes inside my php so that can help as as i am very good at php i have also seen that python can also be used with php as well So which way should i go and roughly how much it will take me to learn java i have done java basics but that was 6 years ago

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• How to have favicon / icon set when bookmarklet dragged to toolbar?

  - by Pistos

  I've made myself a bookmarklet, and it functions just fine, but when added to a toolbar in Opera or Firefox, it just takes on the default bookmark icon for the browser (a globe and a star, respectively). My site has a favicon, and the window, tab and even [site] bookmark uses the favicon I've specified. Just not my bookmarklet. How can I code my site or bookmarklet so that the bookmarklet gets the favicon, too? I'm aware of various manual hackery techniques users can use to set the favicon after the fact, but those are undesirable solutions.

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• ingenious idea needed: how to declare different sizes for different fonts? @font-face?

  - by Haroldo

  I've never seen this done, but i get a feeling that there's gotta be a clever way of doing it. css font-size-adjust looks like it was never meant to be, but when i look around I'm seeing some really ingenious css techniques going on. Take this on nettuts yesterday for using @font-face for vector icons. my challenge: if(user has calibri ) { font-family: calibri; font-size: 12px; } if(user hasn't calibri ) { font-family: arial; font-size: 10px; }

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• Verifying compiler optimizations in gcc/g++ by analyzing assembly listings

  - by Victor Liu

  I just asked a question related to how the compiler optimizes certain C++ code, and I was looking around SO for any questions about how to verify that the compiler has performed certain optimizations. I was trying to look at the assembly listing generated with g++ (g++ -c -g -O2 -Wa,-ahl=file.s file.c) to possibly see what is going on under the hood, but the output is too cryptic to me. What techniques do people use to tackle this problem, and are there any good references on how to interpret the assembly listings of optimized code or articles specific to the GCC toolchain that talk about this problem?

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• How to make a cross browser, W3C valid, semantic, non-javascript ROUND corner?

  - by jitendra

  I want to make a cross-browser (FF3, IE6, Safari, Opera), W3C valid (HTML and CSS both), stretchable (horizontally vertically), without JavaScript and with Semantic and lesser HTML markup Round CORNER. Images can be used for IE6. I've tried and tested many techniques available on community. But everything has one of the problems mentioned above . If anyone knows what I want please share with me? Remember I want to make it without any type of JavaScript, jquery or any type of js.

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• Import module stored in a cStringIO data structure vs. physical disk file

  - by Malcolm

  Is there a way to import a Python module stored in a cStringIO data structure vs. physical disk file? It looks like "imp.load_compiled(name, pathname[, file])" is what I need, but the description of this method (and similar methods) has the following disclaimer: Quote: "The file argument is the byte-compiled code file, open for reading in binary mode, from the beginning. It must currently be a real file object, not a user-defined class emulating a file." [1] I tried using a cStringIO object vs. a real file object, but the help documentation is correct - only a real file object can be used. Any ideas on why these modules would impose such a restriction or is this just an historical artifact? Are there any techniques I can use to avoid this physical file requirement? Thanks, Malcolm [1] http://docs.python.org/library/imp.html#imp.load_module

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• Javascript Closure question.

  - by Tony

  Why the following code prints "0-100"? (function () { for ( var i = 100; i >= 0; i -= 5) { (function() { var pos = i; setTimeout(function() { console.log(" pos = " + pos); }, (pos + 1)*10); })(); } })(); I declare pos = i , which should be in a descending order. This code originated from John Resig' fadeIn() function in his book Pro javascript techniques.

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• How do you do masked password entry on windows using character overwriting?

  - by Erick

  Currently I am using this implementation to hide user input during password entry: void setEcho(bool enable) { HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE); DWORD mode; GetConsoleMode(hStdin, &mode); if(enable) { mode |= ENABLE_ECHO_INPUT; } else { mode &= ~ENABLE_ECHO_INPUT; } SetConsoleMode(hStdin, mode); } The user needs to be able to have positive feed back that text entry is being made. What techniques are available in a Win32 environment using C++?

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• Write a network simulator for fun

  - by Jono

  I want to write my own network simulator, for fun and for personal challenge. I hope to learn both new programming techniques, and a little bit more about networking. Previous object-oriented attempts ended very quickly, but I've recently downloaded and played with Microsoft's Axum (a new version was released today) and their Concurrency and Co-ordination Runtime. As I come from a very OO dominant background, I had never heard of Actor-oriented programming before; now it seems I've had my head in the sand until Scala and F# brought the paradigm to me. My questions are: a) is actor-oriented programming a better choice than object-oriented programming for this task, and if so b) where is a good place to start learning actor-oriented design?

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• 2 way communication over http between a .Net service and Windows Forms Client

  - by user1802969

  I am looking to accomplish 2 way communication over http between a .Net service (WCF SOAP or REST, both options are open) hosted on IIS 7 and Windows Forms Client running on Windows 7. WebSockets are not supported with IIS 7 and all other Comet techniques allow only the web server to push data to client and not the other way around. The client will be very chatty, and there are thousands of clients, so I want to avoid creating a new HTTP request for each message to the server, though that is the last option. Is there any way to do this ?

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• How can I find out how many rows of a matrix satisfy a rather complicated criterion (in R)?

  - by Brani

  As an example, here is a way to get a matrix of all possible outcomes of rolling 4 (fair) dice. z <- as.matrix(expand.grid(c(1:6),c(1:6),c(1:6),c(1:6))) As you may already have understood, I'm trying to work out a question that was closed, though, in my opinion, it's a challenging one. I used counting techniques to solve it (I mean by hand) and I finaly arrived to a number of outcomes, with a sum of subset being 5, equal to 1083 out of 1296. That result is consistent with the answers provided to that question, before it was closed. I was wondering how could that subset of outcomes (say z1, where dim(z1) = [1083,4] ) be generated using R. Do you have any ideas? Thank you.

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• OpenGL Performance Questions

  - by Daniel

  This subject, as with any optimisation problem, gets hit on a lot, but I just couldn't find what I (think) I want. A lot of tutorials, and even SO questions have similar tips; generally covering: Use GL face culling (the OpenGL function, not the scene logic) Only send 1 matrix to the GPU (projectionModelView combination), therefore decreasing the MVP calculations from per vertex to once per model (as it should be). Use interleaved Vertices Minimize as many GL calls as possible, batch where appropriate And possibly a few/many others. I am (for curiosity reasons) rendering 28 million triangles in my application using several vertex buffers. I have tried all the above techniques (to the best of my knowledge), and received almost no performance change. Whilst I am receiving around 40FPS in my implementation, which is by no means problematic, I am still curious as to where these optimisation 'tips' actually come into use? My CPU is idling around 20-50% during rendering, therefore I assume I am GPU bound for increasing performance. Note: I am looking into gDEBugger at the moment Cross posted at Game Development

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• Resources for learning how to better read code

  - by rsteckly

  Hi, I recently inherited a large codebase and am having to read it. The thing is, I've usually been the dev starting a project. As a result, I don't have a lot of experience reading code. My reaction to having to read a lot of code is, well, umm to rewrite it. But I need to bring myself up to speed quickly and build on top of an existing system. Do other people have techniques they've learned to absorb a code base? At this point, I'm just reading through the code. I've tried generating UML diagrams using UModel. They're so big they won't print cleanly and when I zoom in, I really do lose the perspective of seeing all the relationships. How have other people dealt with this problem?

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• CSS image for submit button - clicking image must submit form

  - by Tom

  Please help, I have a form on wordpress. I want the user to be able to click an image instead of the standard submit button. I have the image appear and the submit button disappear - but nothing happens when I click on the image. This is the code I am using: .formBuilderForm .formBuilderSubmit { clear: both; text-align: right; display:block; width:228px; height:49px; background: url(my image url) no-repeat; text-indent:-999em; Before you say "google it" or try search: I have tried the methods mentioned here: http://www.queness.com/post/798/5-techniques-to-style-buttons-using-images-and-css I've read similar posts such as this on stackoverflow but they don't solve my frustratingly simple problem. How to change input button image using CSS? Thanks for your help.

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• Agile version control?

  - by Paul Dixon

  I'm trying to work out a good method to manage code changes on a large project with multiple teams. We use subversion at the moment, but I want more flexibility in building a new release than I seem to be able to get with subversion. Here's roughly I want: for each developer to create easily identifiable patches for the project. Each patch delivers a complete user story (a releasable feature or fix). It might encompass many changes to many files. developers are able to easily apply and remove their own and other patches to facilitate testing release manager selects the patches to be used in the next release into a new branch branch is tested, fixes merged in, and ultimately merged into live teams can then pull these changes back down into their sandboxes. I'm looking at stacked git as a way of achieving this, but what other tools or techniques can deliver this sort of workflow?

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• python dictionary with constant value-type

  - by s.kap

  hi there, I bumped into a case where I need a big (=huge) python dictionary, which turned to be quite memory-consuming. However, since all of the values are of a single type (long) - as well as the keys, I figured I can use python (or numpy, doesn't really matter) array for the values ; and wrap the needed interface (in: x ; out: d[x]) with an object which actually uses these arrays for the keys and values storage. I can use a index-conversion object (input -- index, of 1..n, where n is the different-values counter), and return array[index]. I can elaborate on some techniques of how to implement such an indexing-methods with reasonable memory requirement, it works and even pretty good. However, I wonder if there is such a data-structure-object already exists (in python, or wrapped to python from C/++), in any package (I checked collections, and some Google searches). Any comment will be welcome, thanks.

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• How can the last command's wall time be put in the Bash prompt?

  - by Mr Fooz

  Is there a way to embed the last command's elapsed wall time in a Bash prompt? I'm hoping for something that would look like this: [last: 0s][/my/dir]$ sleep 10 [last: 10s][/my/dir]$ Background I often run long data-crunching jobs and it's useful to know how long they've taken so I can estimate how long it will take for future jobs. For very regular tasks, I go ahead and record this information rigorously using appropriate logging techniques. For less-formal tasks, I'll just prepend the command with time. It would be nice to automatically "time" every single interactive command and have the timing information printed in a few characters rather than 3 lines.

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• Implementing Transparent Persistence

  - by Jules

  Transparent persistence allows you to use regular objects instead of a database. The objects are automatically read from and written to disk. Examples of such systems are Gemstone and Rucksack (for common lisp). Simplified version of what they do: if you access foo.bar and bar is not in memory, it gets loaded from disk. If you do foo.bar = baz then the foo object gets updated on disk. Most systems also have some form of transactions, and they may have support for sharing objects across programs and even across a network. My question is what are the different techniques for implementing these kind of systems and what are the trade offs between these implementation approaches?

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• Fetching content from Website on another Server

  - by benny

  Hi everyone. What i basically want to do is to get content from a website and load it into a div of another website. This should be no problem so far. The problem is, that the content that should be fetched is located on a different server and i have no source access to it. I'd prefer a solution using JavaScript of jQuery. Can i use a .htacces redirect to fetch the content from a remote server with client-side (js) techniques? I will also go with other solutions though. Thanks a lot in advance!

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• Entry points on different urls possible?

  - by user246114

  Hi, I've got a typical gwt project, but am using some url rewriting techniques such that urls entered like: www.mysite.com/johndoe www.mysite.com/janedoe all get served by my main entrypoint project.jsp file. This works great when deployed. When I'm running in hosted mode, it's a total bummer because changing the url in the browser breaks the link with the hosted-mode debugging, such that when I make changes to the source in eclipse and refresh, those changes are not immediately shown. I need to recompile the app and relaunch, and we all know how long that takes. Is there any way to somehow get the hosted-mode environment to recognize that the same webapp is being served on these different urls, and just reconnect the debugging connection? We basically get: http://localhost:8888/myproject.jsp?gwt.codesvr=192.168.1.2:9997 when launching hosted mode, I'd like: http://localhost:8888/johndoe to just reconnect to the debugger, if possible. Thanks

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