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Frameworks: "Libraries You Can Depend On"

Modularize your applications by using Oracle Application Development Framework libraries.

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Using XAML + designer to edit Plain Old CLR Objects?

- by Joe White

I want to write a POCO in XAML, and use a DataTemplate to display that object in the GUI at runtime. So far, so good; I know how to do all that. Since I'll already have a DataTemplate that can transform my POCO into a WPF visual tree, is there any way to get the Visual Studio designer to play along, and have the Design View show me the POCO+DataTemplate's resulting GUI, as I edit the POCO's XAML? (Obviously the designer wouldn't know how to edit the "design view"; I wouldn't expect the Toolbox or click-and-drag to work on the design surface. That's fine -- I just want to see a preview as I edit.) If you're curious, the POCOs in question would be level maps for a game. (At this point, I'm not planning to ship an end-user map editor, so I'll be doing all the editing myself in Visual Studio.) So the XAML isn't WPF GUI objects like Window and UserControl, but it's still not something where I would want to blindly bang out some XAML and hope for the best. I want to see what I'm doing (the GUI map) as I'm doing it. If I try to make a XAML file whose root is my map object, the designer shows "Intentionally Left Blank - The document root element is not supported by the visual designer." It does this even if I've defined a DataTemplate in App.xaml's <Application.Resources>. But I know the designer can show my POCO, when it's inside a WPF object. One possible way of accomplishing what I want would be to have a ScratchUserControl that just contains a ContentPresenter, and write my POCO XAML inside that ContentPresenter's Content property, e.g.: <UserControl ...> <ContentPresenter> <ContentPresenter.Content> <Maps:Map .../> </ContentPresenter.Content> </ContentPresenter> </UserControl> But then I would have to be sure to copy the content back out into its own file when I was done editing, which seems tedious and error-prone, and I don't like tedious and error-prone. And since I can preview my XAML this way, isn't there some way to do it without the UserControl?

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Jasper Reports - Do I need to add all libraries to my Build Path?

- by Jonas

I want to use Jasper Reports in my Java application. I use Eclipse. I have added jasperreports-3.7.2.jar to my Build Path in Eclipse, but when compiling I get many NoClassDefFoundError-exceptions, so I have to add those libraries too to my Build Path. Do I really need to copy all jar-libraries that Jasper Reports are using to my lib-directory and then add them to my Build Path in Eclipse, or is it any easier way to solve this? The libraris I'm talking about are those in Jaspers Report's lib-directory, i.e. commons-digerster-1.7.jar, commons-logging-1.0.4.jar and so on...

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How to use libraries compiled with MingW in MSVC?

- by NumberFour

Hello, I have compiled several libraries with MingW/MSYS... the generated static libraries are always .a files. When I try to link the library with a MSVC project, Visual Studio throws 'unresolved external symbols' ... It means that the .a static library is incompatible with MS C++ Linker. I presume it has to be converted to a MSVC compatible .lib file. Either .a and .lib are just AR archives of .o or .obj files, so is there any way how to use MingW compiled libs in a MSVC project? Or do I have to compile/link everything just in one compiler/linker - MSVC only/MingW only? The MingW compiler is said to be compatible with MSVC. I read a few threads about this topic, but they mostly say that renaming the file to .lib should do the work, but it unfortunately doesn't work for me. Thanks for any advice.

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How can I resolve naming conflict in given precompiled libraries?

- by asm

I'm linking two different libraries that have functions with exactly same name (it's opengl32.lib and libgles_cm.lib - OpenGL ES emulation under Win32 platform), and I want to be able to specify, which version I'm calling. I'm porting a game to OpenGL ES, and what I want to achieve, is a split-screen rendering, where left side is an OpenGL version, and right side is a ES version. To produce the same result, they will recieve slightly different calls, and I'll be able to visually compare them, effectively finding visual artifacts. It worked perfectly with OpenGL/DirectX at the same window, but now the problem is that both versions imports the functions with the same name, like glDrawArrays, and only one version is imported. Unfortunately, I don't have sources of any of that libraries. Is there a way to... I dont' know, wrap one library into additional namespace before linking (with calls like ES::glDrawArrays), somehow rename some of functions or do anything else? I'm using microsoft compiler now, but if there will be solution with another one (GCC/ICC), I'll switch to it.

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C++ Library API Design

- by johannes

I'm looking for a good resource for learning about good API design for C++ libraries, looking at shared objects/dlls etc. There are many resources on writing nice APIs, nice classes, templates and so on at source level, but barely anything about putting things together in shared libs and executables. Books like Large-Scale C++ Software Design by John Lakos are interesting but massively outdated. What I'm looking for is advice i.e. on handling templates. With templates in my API I often end up with library code in my executable (or other library) so if I fix a bug in there I can't simply roll out the new library but have to recompile and redistribute all clients of that code. (and yes, I know some solutions like trying to instantiate at least the most common versions inside the library etc.) I'm also looking for other caveats and things to mind for keeping binary compatibility while working on C++ libraries. Is there a good website or book on such things?

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libstdc++-6.dll not found. [migrated]

- by Molmasepic

I have been working on a project(a game to be specific) and I feel that I should start over with different libraries. So when doing this I reinstalled Code::Blocks and setup my new libraries and includes. But as of now Im having a problem starting u[ my new project to test if all of the includes work. This problem is: libstdc++-6.dll was not found. At first i wondered if I could just find this file online, but its nowhere to be found(or at least the many places I have searched...) Soon after, I tried loading up my old project, and the same problem happened again(wierd... ._.) I was thinking its maybe my compiler, so I used my older compiler and it did the same thing! At this moment I held the problem off for tomorrow(which is today) So my question is: If anyone else had this problem, how would you solve it? Im using Code::Blocks with MinGW as the compiler on Windows Vista 32 bit.

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Entity Framework POCO objects

- by Dan

I'm struggling with understanding Entity Framework and POCO objects. Here's what I'm trying to achieve. 1) Separate the DAL from the Business Layer by having my business layer use an interface to my DAL. Maybe use Unity to create my context. 2) Use Entity Framework inside my DAL. I have a Domain model with objects that reside in my business layer. I also have a database full of tables that doesn't really represent my domain model. I setup Entity Framework and generated POCO objects by using the ADO.NET POCO Generator extension. This gave me an object for each table in my database. Now I want to be able to say context.GetAll<User>(); and have it return a list of my User objects. The User object is in my business layer. Is that possible? Does that make sense or am I totally off and should start over? I'm guessing I need to use the repository pattern to achieve this, but I'm not sure. Can anyone help?

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C#: Adding Functionality to 3rd Party Libraries With Extension Methods

- by James Michael Hare

Ever have one of those third party libraries that you love but it's missing that one feature or one piece of syntactical candy that would make it so much more useful? This, I truly think, is one of the best uses of extension methods. I began discussing extension methods in my last post (which you find here) where I expounded upon what I thought were some rules of thumb for using extension methods correctly. As long as you keep in line with those (or similar) rules, they can often be useful for adding that little extra functionality or syntactical simplification for a library that you have little or no control over. Oh sure, you could take an open source project, download the source and add the methods you want, but then every time the library is updated you have to re-add your changes, which can be cumbersome and error prone. And yes, you could possibly extend a class in a third party library and override features, but that's only if the class is not sealed, static, or constructed via factories. This is the perfect place to use an extension method! And the best part is, you and your development team don't need to change anything! Simply add the using for the namespace the extensions are in! So let's consider this example. I love log4net! Of all the logging libraries I've played with, it, to me, is one of the most flexible and configurable logging libraries and it performs great. But this isn't about log4net, well, not directly. So why would I want to add functionality? Well, it's missing one thing I really want in the ILog interface: ability to specify logging level at runtime. For example, let's say I declare my ILog instance like so: using log4net; public class LoggingTest { private static readonly ILog _log = LogManager.GetLogger(typeof(LoggingTest)); ... } If you don't know log4net, the details aren't important, just to show that the field _log is the logger I have gotten from log4net. So now that I have that, I can log to it like so: _log.Debug("This is the lowest level of logging and just for debugging output."); _log.Info("This is an informational message. Usual normal operation events."); _log.Warn("This is a warning, something suspect but not necessarily wrong."); _log.Error("This is an error, some sort of processing problem has happened."); _log.Fatal("Fatals usually indicate the program is dying hideously."); And there's many flavors of each of these to log using string formatting, to log exceptions, etc. But one thing there isn't: the ability to easily choose the logging level at runtime. Notice, the logging levels above are chosen at compile time. Of course, you could do some fun stuff with lambdas and wrap it, but that would obscure the simplicity of the interface. And yes there is a Logger property you can dive down into where you can specify a Level, but the Level properties don't really match the ILog interface exactly and then you have to manually build a LogEvent and... well, it gets messy. I want something simple and sexy so I can say: _log.Log(someLevel, "This will be logged at whatever level I choose at runtime!"); Now, some purists out there might say you should always know what level you want to log at, and for the most part I agree with them. For the most party the ILog interface satisfies 99% of my needs. In fact, for most application logging yes you do always know the level you will be logging at, but when writing a utility class, you may not always know what level your user wants. I'll tell you, one of my favorite things is to write reusable components. If I had my druthers I'd write framework libraries and shared components all day! And being able to easily log at a runtime-chosen level is a big need for me. After all, if I want my code to really be re-usable, I shouldn't force a user to deal with the logging level I choose. One of my favorite uses for this is in Interceptors -- I'll describe Interceptors in my next post and some of my favorites -- for now just know that an Interceptor wraps a class and allows you to add functionality to an existing method without changing it's signature. At the risk of over-simplifying, it's a very generic implementation of the Decorator design pattern. So, say for example that you were writing an Interceptor that would time method calls and emit a log message if the method call execution time took beyond a certain threshold of time. For instance, maybe if your database calls take more than 5,000 ms, you want to log a warning. Or if a web method call takes over 1,000 ms, you want to log an informational message. This would be an excellent use of logging at a generic level. So here was my personal wish-list of requirements for my task: Be able to determine if a runtime-specified logging level is enabled. Be able to log generically at a runtime-specified logging level. Have the same look-and-feel of the existing Debug, Info, Warn, Error, and Fatal calls. Having the ability to also determine if logging for a level is on at runtime is also important so you don't spend time building a potentially expensive logging message if that level is off. Consider an Interceptor that may log parameters on entrance to the method. If you choose to log those parameter at DEBUG level and if DEBUG is not on, you don't want to spend the time serializing those parameters. Now, mine may not be the most elegant solution, but it performs really well since the enum I provide all uses contiguous values -- while it's never guaranteed, contiguous switch values usually get compiled into a jump table in IL which is VERY performant - O(1) - but even if it doesn't, it's still so fast you'd never need to worry about it. So first, I need a way to let users pass in logging levels. Sure, log4net has a Level class, but it's a class with static members and plus it provides way too many options compared to ILog interface itself -- and wouldn't perform as well in my level-check -- so I define an enum like below. namespace Shared.Logging.Extensions { // enum to specify available logging levels. public enum LoggingLevel { Debug, Informational, Warning, Error, Fatal } } Now, once I have this, writing the extension methods I need is trivial. Once again, I would typically /// comment fully, but I'm eliminating for blogging brevity: namespace Shared.Logging.Extensions { // the extension methods to add functionality to the ILog interface public static class LogExtensions { // Determines if logging is enabled at a given level. public static bool IsLogEnabled(this ILog logger, LoggingLevel level) { switch (level) { case LoggingLevel.Debug: return logger.IsDebugEnabled; case LoggingLevel.Informational: return logger.IsInfoEnabled; case LoggingLevel.Warning: return logger.IsWarnEnabled; case LoggingLevel.Error: return logger.IsErrorEnabled; case LoggingLevel.Fatal: return logger.IsFatalEnabled; } return false; } // Logs a simple message - uses same signature except adds LoggingLevel public static void Log(this ILog logger, LoggingLevel level, object message) { switch (level) { case LoggingLevel.Debug: logger.Debug(message); break; case LoggingLevel.Informational: logger.Info(message); break; case LoggingLevel.Warning: logger.Warn(message); break; case LoggingLevel.Error: logger.Error(message); break; case LoggingLevel.Fatal: logger.Fatal(message); break; } } // Logs a message and exception to the log at specified level. public static void Log(this ILog logger, LoggingLevel level, object message, Exception exception) { switch (level) { case LoggingLevel.Debug: logger.Debug(message, exception); break; case LoggingLevel.Informational: logger.Info(message, exception); break; case LoggingLevel.Warning: logger.Warn(message, exception); break; case LoggingLevel.Error: logger.Error(message, exception); break; case LoggingLevel.Fatal: logger.Fatal(message, exception); break; } } // Logs a formatted message to the log at the specified level. public static void LogFormat(this ILog logger, LoggingLevel level, string format, params object[] args) { switch (level) { case LoggingLevel.Debug: logger.DebugFormat(format, args); break; case LoggingLevel.Informational: logger.InfoFormat(format, args); break; case LoggingLevel.Warning: logger.WarnFormat(format, args); break; case LoggingLevel.Error: logger.ErrorFormat(format, args); break; case LoggingLevel.Fatal: logger.FatalFormat(format, args); break; } } } } So there it is! I didn't have to modify the log4net source code, so if a new version comes out, i can just add the new assembly with no changes. I didn't have to subclass and worry about developers not calling my sub-class instead of the original. I simply provide the extension methods and it's as if the long lost extension methods were always a part of the ILog interface! Consider a very contrived example using the original interface: // using the original ILog interface public class DatabaseUtility { private static readonly ILog _log = LogManager.Create(typeof(DatabaseUtility)); // some theoretical method to time IDataReader Execute(string statement) { var timer = new System.Diagnostics.Stopwatch(); // do DB magic // this is hard-coded to warn, if want to change at runtime tough luck! if (timer.ElapsedMilliseconds > 5000 && _log.IsWarnEnabled) { _log.WarnFormat("Statement {0} took too long to execute.", statement); } ... } } Now consider this alternate call where the logging level could be perhaps a property of the class // using the original ILog interface public class DatabaseUtility { private static readonly ILog _log = LogManager.Create(typeof(DatabaseUtility)); // allow logging level to be specified by user of class instead public LoggingLevel ThresholdLogLevel { get; set; } // some theoretical method to time IDataReader Execute(string statement) { var timer = new System.Diagnostics.Stopwatch(); // do DB magic // this is hard-coded to warn, if want to change at runtime tough luck! if (timer.ElapsedMilliseconds > 5000 && _log.IsLogEnabled(ThresholdLogLevel)) { _log.LogFormat(ThresholdLogLevel, "Statement {0} took too long to execute.", statement); } ... } } Next time, I'll show one of my favorite uses for these extension methods in an Interceptor.

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Flex 4 + Apache Ant, Cannot Load FlashPunk Libraries

- by SquareCrow

I have been searching google, Apache Docs*, and FlashPunk forums looking for an answer to this: I cannot get Ant/Flex to find and compile the FlashPunk libraries. Here is my build.xml. [code]  <copy file="${FLEX_HOME}/ant/lib/flexTasks.jar" todir="${SOURCE_PATH}"/>  <taskdef resource="flexTasks.tasks" classpath="${SOURCE_PATH}/flexTasks.jar"></taskdef>  <target name="build">  <echo message="building swc..." /> <compc output="FlashPunk.swc" keep-generated-actionscript="false" incremental="false" optimize="false" debug="true" use-network="false"> <include-sources dir="${FLASHPUNK_PATH}/net" includes="**/* flashpunk/utils/* flashpunk/masks/*" excludes="**/*.TTF **/*.png"/> <load-config filename="${FLEX_HOME}/frameworks/flex-config.xml"/> </compc> <echo message="building swf..." /> <mxmlc file="${SOURCE_PATH}/epOne.as" output="${OUTPUT_PATH}/epOne.swf" debug="false" incremental="false" strict="true" accessible="false" link-report="link_report.xml" static-link-runtime-shared-libraries="true"> <optimize>true</optimize> </mxmlc> </target> [/code] Results in many errors of the type "Definition net.flashpunk.masks:Grid could not be found" even though when I open the directories I can see the *.AS files right there. Sorry if this is very basic. I am piecing together knowledge of Ant from docs and tutorials. *I decided to use Ant because neither FlashDevelop for Windows nor Eclipse for Linux seemto work for me.

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Linking Libraries in iOS?

- by Joey Green

This is probably a totally noob question but I have missing links in my mind when thinking about linking libraries in iOS. I usually just add a new library that's been cross compiled and set the build and linker paths without really know what I'm doing. I'm hoping someone can help me fill in some gaps. Let's take the OpenCV library for instance. I have this totally working btw because of a really well written tutorial( http://niw.at/articles/2009/03/14/using-opencv-on-iphone/en ), but I'm just wanting to know what is exactly going on. What I'm thinking is happening is that when I build OpenCV for iOS is that your creating object code that gets placed in the .a files. This object code is just the implementation files( .m ) compiled. One reason you would want to do this is to make it hard to see the source code and so that you don't have to compile that source code every time. The .h files won't be put in the library ( .a ). You include the .h in your source files and these header files communicate with the object code library ( .a ) in some way. You also have to include the header files for your library in the Build Path and the Library itself in the Linker Path. So, is the way I view linking libraries correct? If , not can someone correct me on this ?

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Linking Libraries in iOS?

- by Bob Dole

This is probably a totally noob question but I have missing links in my mind when thinking about linking libraries in iOS. I usually just add a new library that's been cross compiled and set the build and linker paths without really know what I'm doing. I'm hoping someone can help me fill in some gaps. Let's take the OpenCV library for instance. I have this totally working btw because of a really well written tutorial( http://niw.at/articles/2009/03/14/using-opencv-on-iphone/en ), but I'm just wanting to know what is exactly going on. What I'm thinking is happening is that when I build OpenCV for iOS is that your creating object code that gets placed in the .a files. This object code is just the implementation files( .m ) compiled. One reason you would want to do this is to make it hard to see the source code and so that you don't have to compile that source code every time. The .h files won't be put in the library ( .a ). You include the .h in your source files and these header files communicate with the object code library ( .a ) in some way. You also have to include the header files for your library in the Build Path and the Library itself in the Linker Path. So, is the way I view linking libraries correct? If , not can someone correct me on this ?

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Where to place php libraries/extensions?

- by gdaniel

I am new to a lot of server configurations and options. I want to add extra php libraries/extensions to my server. Where do I add them? (I am on a CENTOS 6.5 VPS) For example, I want to add the phpseclib php extension: Their website instructions are minimum: Usage This library is written using the same conventions that libraries in the PHP Extension and Application Repository (PEAR) used to be written in (current requirements break PHP4 compatibility). In particular, this library needs to be in your include_path: <?php set_include_path(get_include_path() . PATH_SEPARATOR . 'phpseclib'); include('Net/SSH2.php'); ?> It tells me how to use it, but it doesn't tell me where to add the actual extension files. Should I added it under? usr/local/lib ? usr/local/lib/php ? usr/local/lib/php/pear ? Or can I add it under public_html? Also, my VPS has several users under /home/.. is that away to make the library available for only one user?

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NET Math Libraries

- by JoshReuben

NET Mathematical Libraries .NET Builder for Matlab The MathWorks Inc. - http://www.mathworks.com/products/netbuilder/ MATLAB Builder NE generates MATLAB based .NET and COM components royalty-free deployment creates the components by encrypting MATLAB functions and generating either a .NET or COM wrapper around them. .NET/Link for Mathematica www.wolfram.com a product that 2-way integrates Mathematica and Microsoft's .NET platform call .NET from Mathematica - use arbitrary .NET types directly from the Mathematica language. use and control the Mathematica kernel from a .NET program. turns Mathematica into a scripting shell to leverage the computational services of Mathematica. write custom front ends for Mathematica or use Mathematica as a computational engine for another program comes with full source code. Leverages MathLink - a Wolfram Research's protocol for sending data and commands back and forth between Mathematica and other programs. .NET/Link abstracts the low-level details of the MathLink C API. Extreme Optimization http://www.extremeoptimization.com/ a collection of general-purpose mathematical and statistical classes built for the.NET framework. It combines a math library, a vector and matrix library, and a statistics library in one package. download the trial of version 4.0 to try it out. Multi-core ready - Full support for Task Parallel Library features including cancellation. Broad base of algorithms covering a wide range of numerical techniques, including: linear algebra (BLAS and LAPACK routines), numerical analysis (integration and differentiation), equation solvers. Mathematics leverages parallelism using .NET 4.0's Task Parallel Library. Basic math: Complex numbers, 'special functions' like Gamma and Bessel functions, numerical differentiation. Solving equations: Solve equations in one variable, or solve systems of linear or nonlinear equations. Curve fitting: Linear and nonlinear curve fitting, cubic splines, polynomials, orthogonal polynomials. Optimization: find the minimum or maximum of a function in one or more variables, linear programming and mixed integer programming. Numerical integration: Compute integrals over finite or infinite intervals, over 2D and higher dimensional regions. Integrate systems of ordinary differential equations (ODE's). Fast Fourier Transforms: 1D and 2D FFT's using managed or fast native code (32 and 64 bit) BigInteger, BigRational, and BigFloat: Perform operations with arbitrary precision. Vector and Matrix Library Real and complex vectors and matrices. Single and double precision for elements. Structured matrix types: including triangular, symmetrical and band matrices. Sparse matrices. Matrix factorizations: LU decomposition, QR decomposition, singular value decomposition, Cholesky decomposition, eigenvalue decomposition. Portability and performance: Calculations can be done in 100% managed code, or in hand-optimized processor-specific native code (32 and 64 bit). Statistics Data manipulation: Sort and filter data, process missing values, remove outliers, etc. Supports .NET data binding. Statistical Models: Simple, multiple, nonlinear, logistic, Poisson regression. Generalized Linear Models. One and two-way ANOVA. Hypothesis Tests: 12 14 hypothesis tests, including the z-test, t-test, F-test, runs test, and more advanced tests, such as the Anderson-Darling test for normality, one and two-sample Kolmogorov-Smirnov test, and Levene's test for homogeneity of variances. Multivariate Statistics: K-means cluster analysis, hierarchical cluster analysis, principal component analysis (PCA), multivariate probability distributions. Statistical Distributions: 25 29 continuous and discrete statistical distributions, including uniform, Poisson, normal, lognormal, Weibull and Gumbel (extreme value) distributions. Random numbers: Random variates from any distribution, 4 high-quality random number generators, low discrepancy sequences, shufflers. New in version 4.0 (November, 2010) Support for .NET Framework Version 4.0 and Visual Studio 2010 TPL Parallellized – multicore ready sparse linear program solver - can solve problems with more than 1 million variables. Mixed integer linear programming using a branch and bound algorithm. special functions: hypergeometric, Riemann zeta, elliptic integrals, Frensel functions, Dawson's integral. Full set of window functions for FFT's. Product Price Update subscription Single Developer License $999 $399 Team License (3 developers) $1999 $799 Department License (8 developers) $3999 $1599 Site License (Unlimited developers in one physical location) $7999 $3199 NMath http://www.centerspace.net .NET math and statistics libraries matrix and vector classes random number generators Fast Fourier Transforms (FFTs) numerical integration linear programming linear regression curve and surface fitting optimization hypothesis tests analysis of variance (ANOVA) probability distributions principal component analysis cluster analysis built on the Intel Math Kernel Library (MKL), which contains highly-optimized, extensively-threaded versions of BLAS (Basic Linear Algebra Subroutines) and LAPACK (Linear Algebra PACKage). Product Price Update subscription Single Developer License $1295 $388 Team License (5 developers) $5180 $1554 DotNumerics http://www.dotnumerics.com/NumericalLibraries/Default.aspx free DotNumerics is a website dedicated to numerical computing for .NET that includes a C# Numerical Library for .NET containing algorithms for Linear Algebra, Differential Equations and Optimization problems. The Linear Algebra library includes CSLapack, CSBlas and CSEispack, ports from Fortran to C# of LAPACK, BLAS and EISPACK, respectively. Linear Algebra (CSLapack, CSBlas and CSEispack). Systems of linear equations, eigenvalue problems, least-squares solutions of linear systems and singular value problems. Differential Equations. Initial-value problem for nonstiff and stiff ordinary differential equations ODEs (explicit Runge-Kutta, implicit Runge-Kutta, Gear's BDF and Adams-Moulton). Optimization. Unconstrained and bounded constrained optimization of multivariate functions (L-BFGS-B, Truncated Newton and Simplex methods). Math.NET Numerics http://numerics.mathdotnet.com/ free an open source numerical library - includes special functions, linear algebra, probability models, random numbers, interpolation, integral transforms. A merger of dnAnalytics with Math.NET Iridium in addition to a purely managed implementation will also support native hardware optimization. constants & special functions complex type support real and complex, dense and sparse linear algebra (with LU, QR, eigenvalues, ... decompositions) non-uniform probability distributions, multivariate distributions, sample generation alternative uniform random number generators descriptive statistics, including order statistics various interpolation methods, including barycentric approaches and splines numerical function integration (quadrature) routines integral transforms, like fourier transform (FFT) with arbitrary lengths support, and hartley spectral-space aware sequence manipulation (signal processing) combinatorics, polynomials, quaternions, basic number theory. parallelized where appropriate, to leverage multi-core and multi-processor systems fully managed or (if available) using native libraries (Intel MKL, ACMS, CUDA, FFTW) provides a native facade for F# developers

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How to deal with recursive dependencies between static libraries using the binutils linker?

- by Jack Lloyd

I'm porting an existing system from Windows to Linux. The build is structured with multiple static libraries. I ran into a linking error where a symbol (defined in libA) could not be found in an object from libB. The linker line looked like g++ test_obj.o -lA -lB -o test The problem of course being that by the time the linker finds it needs the symbol from libA, it has already passed it by, and does not rescan, so it simply errors out even though the symbol is there for the taking. My initial idea was of course to simply swap the link (to -lB -lA) so that libA is scanned afterwards, and any symbols missing from libB that are in libA are picked up. But then I find there is actually a recursive dependency between libA and libB! I'm assuming the Visual C++ linker handles this in some way (does it rescan by default?). Ways of dealing with this I've considered: Use shared objects. Unfortunately this is undesirable from the perspective of requiring PIC compliation (this is performance sensitive code and losing %ebx to hold the GOT would really hurt), and shared objects aren't needed. Build one mega ar of all of the objects, avoiding the problem. Restructure the code to avoid the recursive dependency (which is obviously the Right Thing to do, but I'm trying to do this port with minimal changes). Do you have other ideas to deal with this? Is there some way I can convince the binutils linker to perform rescans of libraries it has already looked at when it is missing a symbol?

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Javascript libraries + JQuery plugins contradict? How to debug?

- by Metafaniel

This is somewhat a newbie question... I effort everyday to learn, so please understand ;) I'm not the very best expert, but I can do a decent job good looking and functional websites or web applications. My main tools are PHP5, HTML5, CSS2 y 3, a database (SQLite, MySQL) and Javascript and JQuery. I'm not an expert at all in Javascript. I often find interesting JQuery plugins or tutorials and try to mix them up to do the functionality needed. This time I'm mixing maybe too much plugins and js files from different sources. In fact, my app do what I want except for certain behaviors... There are no errors, everything looks fine, but the misbehavior persists. So maybe I need to specify a class I don't know about, or one contradicts another one from another plugin and I just can't understand, for example, why a <button type="button">DON'T submit</button> just submits the form... Anyway, my point is: Do you people know a way to debug this situations??? Is there a generic tool, suggestion, workflow or something to help me understand conflicts or omissions between libraries or plugins??? (Javascript libraries, my own Javascripts and JQuery plugins)??? I hope it is a way! THANKS A LOT FOR YOUR HELP AND COMPREHENSION! =)

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Why not use JavaScript but libraries instead?

- by shareef

I read this article Unobtrusive JavaScript with jQuery and I noticed these points in the slide page 11 some companies strip JavaScript at the firewall some run the NoScript Firefox extension to protect themselves from common XSS and CSRF attacks many mobile devices ignore JavaScript entirely screen readers do execute JavaScript but accessibility issues mean you may not want them to I did not understand the fourth point. What does it mean? I need your comment and responses on these points. Is not using JavaScript and switching to libraries like jQuery worth it?

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Are there any libraries similar to Three20? [closed]

- by GoldFire

Are there any libraries similar to Three20? Three20 does not work for me on iOS 5; it gives me warnings. Three20 provides powerful view controllers such as the Launcher, the popular Photo Browser, and internet-aware tables. The library is modular, meaning you choose which elements of the library to include in your app. This modular design allows Three20 to be one of the only Objective-C frameworks that encourages what are called 'extensions' from the community.

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error while loading shared libraries, file too short

- by tommyk

From one of my customers I got an application. When I try to run it I got following error error while loading shared libraries: ./libvtkWidgets.so.5.4: file too short In my project structure I see following: -rwxrwxrwx 1 tomasz tomasz 20 2011-02-01 10:44 libvtkWidgets.so -rwxrwxrwx 1 tomasz tomasz 22 2011-02-01 10:44 libvtkWidgets.so.5.4 -rwxrwxrwx 1 tomasz tomasz 2147103 2011-02-01 10:44 libvtkWidgets.so.5.4.2 Is my shared library libvtkWidgets corrupted ? How to solve that error ?

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Looking for a Python IDE with good support for libraries (Twisted).

- by Omega

I'm looking for a Python IDE that can help me easily locate and manage and use the libraries on my system (Ubuntu). Specifically Twisted. Code completion is important including the symbols I import. (I've so far had a look at PyDev as well as OpenKomodo, but while both offer code completion for default Python concepts, I wasn't able to get either to import Twisted into my project and was thus getting reference errors.) Usual disclaimer: I don't like EMACS or vi, please, nothing regarding those.

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Setting Up GLFW3 in Visual Studio

- by sm81095

I decided a couple of days ago that I was going to start trying to develop games in C++ with OpenGL, instead of C# Monogame like I have been doing for a while. I was looking around for libraries to use, to make OpenGL a little easier to use. I settled on GLEW and GLFW. GLEW was a super easy copy/paste, but GLFW3 was not. After looking around for a while and fighting with CMake, I got the GLFW2.lib file created, and I added the additional include directories, library directories, and linked my program to the glfw3.lib file I just created. The problem is, I get these linker errors when I try to run or build my program: Error 1 error LNK2019: unresolved external symbol _glfwInit referenced in function _main C:\Codex Interactive\Projects\OGLTest\OGLTest\test.obj OGLTest Error 2 error LNK2019: unresolved external symbol _glfwTerminate referenced in function _main C:\Codex Interactive\Projects\OGLTest\OGLTest\test.obj OGLTest Error 3 error LNK2019: unresolved external symbol _glfwSetErrorCallback referenced in function _main C:\Codex Interactive\Projects\OGLTest\OGLTest\test.obj OGLTest and 10 other LNK2019 errors, all talking about some glfw method, as well as: Error 14 error LNK1120: 13 unresolved externals C:\Codex Interactive\Projects\OGLTest\Debug\OGLTest.exe 1 1 OGLTest at the very bottom of the error list. I've looked up most of these errors on their own, and the solutions that I find either do nothing to solve the problem, or are people commenting on how dumb people are for not being about to solve this linker problem. Any assistance to solve these errors would be greatly appreciated. Info: I built GLFW3 on Cmake for Visual Studio 11, 32 bit and 64 bit, and both threw the same errors. The only extra libraries I linked were opengl32.lib, glu32.lib, and glfw3.lib Here is the test code (from GLFW3's latest tutorial): Code

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Use Multiple jQuery and jQuery UI Libraries

- by Seth Duncan

Is there a way to use multiple jQuery and jQuery UI Libraries in the same source? I know about noConflict and using multiple jQuery Libraries with this method, however is it possible to use multiple jQuery UI Libraries? Essentially I would like to use jQuery 1.2.6 and jQuery UI 1.6 together for a certain portion of the page that only works with those libraries and then for everything else use the latest jQuery Libraries of 1.4.2 and UI 1.8. Thanks, -Seth

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Overinclusion of libraries C++

- by wyatt

I'm reading about how to put a makefile together, but no-one seems to mention what to do if your files require different sets of libraries, they all seem to use the same set of libraries for each file. Since it seems unlikely that every single file has the same libraries, I take it the list they use must amalgamate all of the libraries required across the project. I just wanted to know if there's any downside to including too many libraries, or if the compiler works out which ones are needed and ignores the rest? Thanks

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POCO inherited type could not pass addObject method

- by bryanevil

Hi all I am using a POCO class name "Company" generate from the T4 POCO code generator to create a derived class - name "CompanyBO" by "public class CompanyBO:Company", but when i call addObject method: public void Delete(T entity) { CustomerWebPortalEntities entities = new CustomerWebPortalEntities(); entities.AddObject(entity.GetType().BaseType.Name, entity); entities.DeleteObject(entity); SaveChanges(); } it compliant this: The EntitySet name 'CustomerWebPortalEntities.Company' could not be found. System.Data.Objects.ObjectContext.GetEntitySet(String entitySetName, String entityContainerName) at System.Data.Objects.ObjectContext.GetEntitySetFromName(String entitySetName) Could you please tell me whats going wrong here? How do I resolve this problem? Best Regards Bryan

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Generate POCO classes from a database

- by Max Fraser

Anyone know of a simple tool to quickly create POCO classes based on an existing database?

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