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• Library search paths

  - by David Clements

  This question originally started in an apparent problem in Cups calling various back-ends and using non-standard library search paths. If I want to change a library search path for a app running in a terminal I can use LD_LIBRARY_PATH, RPATH, etc., but if I want to change a library path for a Cups back end, I subsequently resolved the Cups issue, but I don't see any mechanism to change the search path whare an app is not running in terminal. For example Cups calls backendA and backendB to print on 2 printers, BackendA uses libxxx.1.15 and BackendB needs libxxx.1.05, is there any way to change the library search path for backendB (only) without recompiling backendB, (I may not have the source)? Any ideas?

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• Consistency vs. Usability?

  - by dsimcha

  When designing an API, consistency often aids usability. However, sometimes they conflict where an extra API feature can be added to streamline a common case. It seems like there's somewhat of a divide over what to do here. Some designs (the Java standard library come to mind) favor consistency even if it makes common cases more verbose. Others (the Python standard library comes to mind) favor usability even if it means treating the common case as "special" to make it easier. What is your opinion on how consistency and usability should be balanced?

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• What language has the best/most library bindings?

  - by Rook

  A library binding allows a programming language to use a library written in another language. Most commonly you want to access a C library like libcurl from a language like PHP or Python. Not all bindings are created equally, for instance the libcurl binding for Python was abandoned almost 3 years ago and their sf.net bug tracker is overrun with unsolved problems. PHP on the other hand has very good libcurl bindings that are actively maintained. So here is my question: What language has the best and/or the most bindings?

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• What''s easy extensible technique to store game data?

  - by Miro

  I'm looking for library/technique for storing my game resources - levels, object (effects,world info), items(price,effects,...), NPC(visual info, behavior), everything except graphics/audio stuff. I've seen lua used for Awesome WM configuration. protobuf looks good, but it seems to be designed for network communication. I've tried to write my own parser, but as the project grows it's more and more harder to manage it and catch all the bugs. My requiremets: stability easy extension of data without need to convert older versions to newer good(don't have to be the best) performance of loading not much coding not XML!

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• XRegExp Regular Expression Library for JavaScript

  - by Jan Goyvaerts

  XRegExp is an open source JavaScript library. It extends JavaScript’s regex syntax with features such as free-spacing, named capture, mode modifiers, and Unicode categories, blocks, and scripts. It also provides its own test(), exec(), forEach(), replace(), and split() methods that eliminate most cross-browser inconstencies and bugs. Anyone using non-trivial regexes in their JavaScript code should seriously consider using XRegExp. Last month’s update of the Regular-Expressions.info website added full coverage of XRegExp to the regex tutorial and regex reference sections. But the tools & languages section was missing the XRegExp page, resulting in broken links in the tutorial and reference sections. This page has now been added.

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• How to install an additional .NET library?

  - by Deusdies

  I'm a beginner .NET programmer (C# and IronPython). I've come across WatiN .NET library which will show handy for what I'm trying to do. The website claims that it is compatible with any .NET language, so I assume it's compatible with IronPython as well. How do I go about installing it? Their website only has some instructions, using NUget in Visual Studio. I neither use Visual Studio nor am I interested in it. How and where would I put the downloaded files in order to make it work with IronPython?

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• What are the tradeoffs involved in referencing Context in a library?

  - by C. Ross

  Context is one of the core classes of Android, and many functions it contains are useful in Android library projects, particularly accessing configuration. What are the trade offs involved in accessing the Context in a library, either by injection or by subclassing Application in the library, and subclassing that in the application. Does this make the application brittle or introduce inappropriate coupling?

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• Did C++11 address concerns passing std lib objects between dynamic/shared library boundaries? (ie dlls and so)?

  - by Doug T.

  One of my major complaints about C++ is how hard in practice it is to pass std library objects outside of dynamic library (ie dll/so) boundaries. The std library is often header-only. Which is great for doing some awesome optimizations. However, for dll's, they are often built with different compiler settings that may impact the internal structure/code of a std library containers. For example, in MSVC one dll may build with iterator debugging on while another builds with it off. These two dlls may run into issues passing std containers around. If I expose std::string in my interface, I can't guarantee the code the client is using for std::string is an exact match of my library's std::string. This leads to hard to debug problems, headaches, etc. You either rigidly control the compiler settings in your organization to prevent these issues or you use a simpler C interface that won't have these problems. Or specify to your clients the expected compiler settings they should use (which sucks if another library specifies other compiler settings). My question is whether or not C++11 tried to do anything to solve these issues?

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• Strange problem with libc: undefined reference to `crypt'

  - by sorush-r

  I moved from Archlinux to Kubuntu 12.04 yesterday. I compiled buildroot 2012.08 on Archlinux without any problem. Though on Kubuntu libcrypt seems to be broken. sysvinit can't find it anywhere. glibc-dev and all dependencies are installed. How do I link to libcrypt? Or, which package containts that library? ... bc-gcc sulogin.o -o sulogin sulogin.o: In function `main': sulogin.c:(.text+0x49d): undefined reference to `crypt' collect2: ld returned 1 exit status

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• Is it OK to live without knowing how the program you created works?

  - by Kabumbus

  I mean, there are really useful libs that can solve problems when you are stuck and do not know how to solve this or that with your knowledge of programing language you use... For example, Boost for C++ or JQuery for JavaScript or Spring for Java... They solve problems in seconds and you do not really care how they did it (despite that they are written in the very same language you are programming in)... So I wonder am I alone use libs not being capable to write solutions for my problems from scratch or its standard practice?

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• Converting lib from other language to python and Rights issue

  - by Arruda

  If I take a program, and basically translate its source from some language to python, with some small changes, can I do a entirely my new lib or I have to make a "version" of the old one? would this be a copy of the first or a new lib based in the ideas of the first? OBS: Consider the original lib is using Apache License v2 Not sure if well explained, but I can't see for now how to make it more clear.

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• Easiest Way to Get Started With 3D?

  - by ryebread761

  I'm looking at getting into 3D game development and am wondering what would be the best, quickest engine to get started with. I need to be able to develop on a Macintosh with it. I know Java, and PHP mainly but have worked in many others. At this point, I feel I can adapt to most languages quite easy. So the programming language doesn't really matter to me. I've sorta kinda tried unity in the past and wasn't all too fond of it, so it's kind of a "I can't find anything better" resort. I'm hoping with how open I am I will find something I like more. Thanks in advance.

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• Which graphics library should I be using?

  - by DaveDev

  I have been developing and maintaining a WPF application, for which I've recently been tasked with adding a 3D representation of some of the data. I'm new to graphics programming in every kind of way so I'm curious whether I should stick with 3D graphics capabilities built into WPF or should I investigate other solutions, like OpenTK or SharpGL My objective is to represent the data so that it will eventually appear similar to: with nodes connected by lines. I need to rotate the image around each axis and each node will be a 3D model of the device it represents. So far, I've been able to experiment with the tutorial outlined here: Windows Presentation Foundation (WPF) 3D Tutorial and it was helpful as an introduction. But I can see that there are other ways to implement 3D graphics solutions and I wonder if they are more suitable for my needs, or should I stick with the in-built WPF solution? What are the pros and cons of each?

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• Should I fork for a major re-write that uses a small amount of the original code?

  - by It'sNotALie.

  I'm writing a library. It's a completely rewritten version of another one, to suit my needs (PCL compatibility, mainly). However, the API will be completely rewritten, as I'll need to change a lot of stuff around for PCL compliance. Also, as it is a rewrite, I won't be able to just start from the library and just change it bit by bit, as I typically see with forks. I tried that, but it just didn't work. So what should I do? Should I fork here or should I make a new library?

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• How can you build a C++ library to produce a .lib file for use in another project?

  - by Codereview

  I tried to use Cmake for the first time, I tried adding a library to my project (Specifically, PhysFS) but then I understood that the library had no .lib file or .a file at all, so I have to build those somehow. I have no clue where to even start around going this, what should I do? Someone suggested I'd go to the project folder and type "Cmake ..." then "Make ..." but I was clueless as to how I'd do that. How would I build the library headers and source files in a .lib file that I can link in C::B? I'm using Windows XP SP3

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• C++ game programming

  - by UnTraDe

  Until now I have been using C# with XNA for 2d and a little bit of 3d games, althought I dont remember that I finished any of them I want to start working with C++. I have a very very little exprience with C++ and my question is where to start? I plated a little bit with SFML and I encountered some problems with performance when I started to build a tile based game. I'm pretty sure that the problem is my code and not the library itself. Is there anything similiar to XNA for C++? I should keep try and work with SFML? Sorry for my bad english! Thanks in advance!

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• Is there a way to catch a MOUSE_UP Event over a static textfield in Flash?

  - by Jovica Aleksic

  When the user presses the mouse, and releases it over a static textfield with selectable text, no MOUSE_UP event is fired - not on the stage and also nowhere else. I experienced this when using a scrollbar class on a movieclip with a nested static textfield. When the user drags the scroll handle and releases the mouse over the textfield, the dragging/scrolling is stuck. To test this, create a new AS3 fla file, place a static textfield somewhere, and put in some text. Make sure the selectable property is checked in the properties panel. Add this script to the timeline: import flash.events.* function down(event:Event):void { trace('down'); } function up(event:Event):void { trace('up'); } stage.addEventListener(MouseEvent.MOUSE_DOWN, down) stage.addEventListener(MouseEvent.MOUSE_UP, up) Now test the movie and click the mouse. You will notice that trace('up') will not occur when you release the mouse over the textfield.

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• How to initialize a static const map in c++?

  - by Meloun

  Hi, I need just dictionary or asociative array string = int. There is type map C++ for this case. But I need make one map in my class make for all instances(- static) and this map cannot be changed(- const); I have found this way with boost library std::map<int, char> example = boost::assign::map_list_of(1, 'a') (2, 'b') (3, 'c'); Is there other solution without this lib? I have tried something like this, but there are always some issues with map initialization. class myClass{ private: static map<int,int> create_map() { map<int,int> m; m[1] = 2; m[3] = 4; m[5] = 6; return m; } static map<int,int> myMap = create_map(); } thanks

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• How can I change the value or a static char* from a function? C++

  - by flyout

  I am trying to change the value of a "static char *" I define at startup, I do it from inside a function, and when this function returns the var I am trying to re-set the value doesn't retain it. Example: static char *X = "test_1"; void testFunc() { char buf[256]; // fill buf with stuff... X = buf; } How can I achieve this without using static for buf? Should I use another datatype? if so, which one?

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• Where should common static resources (images, js, css, etc) go in DotNetNuke?

  - by Joosh21

  Is there a recommended location to store static resources (images, css, js, etc) in a DotNetNuke 5.x installation? There are /images and /js folders as well as a /Resources folder that contains resources. There appears to be some overlap as MicrosoftAjax.js is in multiple locations (but might be different versions?). I also could put resources in a /DesktopModule/ModuleX location. Does anyone know if there is a difference in using any of these folders? I kinda like the idea of all static resources being under a common folder (/Resources) so I could set caching rule headers, permissions, etc on them in one place. Has anyone used a separate image server to serve DotNetNuke static content? http://stackoverflow.com/questions/913208/pros-and-cons-of-a-separate-image-server-e-g-images-mydomain-com

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• Can I use a static var to "cache" the result? C++

  - by flyout

  I am using a function that returns a char*, and right now I am getting the compiler warning "returning address of local variable or temporary", so I guess I will have to use a static var for the return, my question is can I make something like if(var already set) return var else do function and return var? This is my function: char * GetUID() { TCHAR buf[20]; StringCchPrintf(buf, 20*sizeof(char), TEXT("%s"), someFunction()); return buf; } And this is what I want to do: char * GetUID() { static TCHAR buf[20]; if(strlen(buf)!=0) return buf; StringCchPrintf(buf, 20*sizeof(char), TEXT("%s"), someFunction()); return buf; } Is this a well use of static vars? And should I use ZeroMemory(&buf, 20*sizeof(char))? I removed it because if I use it above the if(strlen...) my TCHAR length is never 0, should I use it below?

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• C# Add class instance with internal timer to a static List, is it safe?

  - by CodeMongo

  My program has a static list of type classA. ClassA implements a threading timer that executes a task. The list may contain as many instances of classA as desired. Is this technique causing threading issues where the class instances can block each other? It that is the case how can I solve the that problem. ex: static List<MyClassType> list=null; void static Main() { list = new List<MyClassType>(); var a = new MyClassType(); var b = new MyClassType(); list.Add(a); list.Add(b); Console.ReadKey(); } a and b will execute theire internal task based on the timer.Is it s bsd technique? Why?

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• Header unset Server not working for static files

  - by Sam Lee

  I'm trying to unset the "Server" field in response headers. I do this using Header unset Server, and that works fine for requests handled by mod_perl. However, for requests to /static I use Apache to serve static files. For some reason, when these files are loaded directly in the browser, the Server field is not removed. How can I go about fixing this? Relevent parts of my httpd.conf: LoadModule headers_module modules/mod_headers.so Header unset Server <VirtualHost *:80> <Location /> SetHandler modperl PerlResponseHandler MyHandler </Location> Alias /static/ /home/site/static/ <Location /static> SetHandler None </Location> </VirtualHost>

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• Ask How-To Geek: Clone a Disk, Resize Static Windows, and Create System Function Shortcuts

  - by Jason Fitzpatrick

  This week we take a look at how to clone a hard disk for easy backup or duplication, resize stubbornly static windows, and create shortcuts for dozens of Windows functions. Once a week we dip into our reader mailbag and help readers solve their problems, sharing the useful solutions with you in the process. Read on to see our fixes for this week’s reader dilemmas. Latest Features How-To Geek ETC HTG Projects: How to Create Your Own Custom Papercraft Toy How to Combine Rescue Disks to Create the Ultimate Windows Repair Disk What is Camera Raw, and Why Would a Professional Prefer it to JPG? The How-To Geek Guide to Audio Editing: The Basics How To Boot 10 Different Live CDs From 1 USB Flash Drive The 20 Best How-To Geek Linux Articles of 2010 ShapeShifter: What Are Dreams? [Video] This Computer Runs on Geek Power Wallpaper Bones, Clocks, and Counters; A Look at the First 35,000 Years of Computing Arctic Theme for Windows 7 Gives Your Desktop an Icy Touch Install LibreOffice via PPA and Receive Auto-Updates in Ubuntu Creative Portraits Peek Inside the Guts of Modern Electronics

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• Box2D Static-Dynamic body joint eliminates collisions

  - by andrewz

  I have a static body A, and a dynamic body B, and a dynamic body C. A is filtered to not collide with anything, B and C collide with each other. I wish to create a joint between B and A. When I create a joint (ex. revolute), B no longer collides with C - C passes through it as if it does not exist. What am I doing wrong? How can adding a joint prevent a body from colliding with another body it used to? EDIT: I want to join B with A, and have B collide with C, but not A collide with C. In realistic terms, I'm trying to create a revolute joint between a wheel (B) and a wall (A), and have a box (C) hit the wheel and the wheel would then rotate. EDIT: I create a the simplest revolute joint I can with these parameters (C++): b2RevoluteJointDef def; def.Initialize(A, B, B -> GetWorldCenter()); world -> CreateJoint(&def);

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