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  • Recommendations for a C++ polymorphic, seekable, binary I/O interface

    - by Trevor Robinson
    I've been using std::istream and ostream as a polymorphic interface for random-access binary I/O in C++, but it seems suboptimal in numerous ways: 64-bit seeks are non-portable and error-prone due to streampos/streamoff limitations; currently using boost/iostreams/positioning.hpp as a workaround, but it requires vigilance Missing operations such as truncating or extending a file (ala POSIX ftruncate) Inconsistency between concrete implementations; e.g. stringstream has independent get/put positions whereas filestream does not Inconsistency between platform implementations; e.g. behavior of seeking pass the end of a file or usage of failbit/badbit on errors Don't need all the formatting facilities of stream or possibly even the buffering of streambuf streambuf error reporting (i.e. exceptions vs. returning an error indicator) is supposedly implementation-dependent in practice I like the simplified interface provided by the Boost.Iostreams Device concept, but it's provided as function templates rather than a polymorphic class. (There is a device class, but it's not polymorphic and is just an implementation helper class not necessarily used by the supplied device implementations.) I'm primarily using large disk files, but I really want polymorphism so I can easily substitute alternate implementations (e.g. use stringstream instead of fstream for unit tests) without all the complexity and compile-time coupling of deep template instantiation. Does anyone have any recommendations of a standard approach to this? It seems like a common situation, so I don't want to invent my own interfaces unnecessarily. As an example, something like java.nio.FileChannel seems ideal. My best solution so far is to put a thin polymorphic layer on top of Boost.Iostreams devices. For example: class my_istream { public: virtual std::streampos seek(stream_offset off, std::ios_base::seekdir way) = 0; virtual std::streamsize read(char* s, std::streamsize n) = 0; virtual void close() = 0; }; template <class T> class boost_istream : public my_istream { public: boost_istream(const T& device) : m_device(device) { } virtual std::streampos seek(stream_offset off, std::ios_base::seekdir way) { return boost::iostreams::seek(m_device, off, way); } virtual std::streamsize read(char* s, std::streamsize n) { return boost::iostreams::read(m_device, s, n); } virtual void close() { boost::iostreams::close(m_device); } private: T m_device; };

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  • How can I match string order between two documents in PERL?

    - by Randy
    Hi, I've a problem in making a PERL program for matching the words in two documents. Let's say there are documents A and B So I want to delete the words in document A that's not in the document B A: I eat pizza B: She go to the market and eat pizza result: eat pizza I use Perl for the system and the sentences in each document isn't in a big numbers so I think I won't use SQL And the program is a subproram for automatic essay grading for Indonesian Language (Bahasa) Thanx, Sorry if my question is a bit confusing. I'm really new to 'this world' :)

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  • The future of programming, or what lies in the future in programming?

    - by prosseek
    I remember that a article that Microsoft uses formal verification to debug the Device Driver, and I also remember that Functional Programming removes much of the bug as it ensures stateless programming. And we all know about the multi-core. I beleive all of them are future direction of programming or programming language. Multi-core programming or parallel programming Software Formal Verification Functional Programming (as a mainstream?) What do you think? What will be the future of programming?

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  • a good smart phone for java development?

    - by pstanton
    Hi all, I'd like to do some development of smart phone apps and my native programming language is java. The first application I'd like to write will need to be able to (attempt to) connect to a network (LAN or WiFi) automatically in the background (on a schedule). would an android phone be the best path or are there competitive purer java options?

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  • Are there any simple languages implemented using ANTLR or similar?

    - by etheros
    I'm trying to build a simple interpreted language for learning purposes. I've read countless theory and tutorials on ANTLR and JavaCC, but I can't figure out how to actually make it do something useful. I learn best by "taking something apart and putting it back together again", so, are there any working examples of simple languages implemented with the help of tools such as ANTLR, or similar? Something like the following might be nice: x = 1 if x == 1 print "true"

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  • JNI - GetObjectField returns NULL

    - by Daniel
    I'm currently working on Mangler's Android implementation. I have a java class that looks like so: public class VentriloEventData { public short type; public class _pcm { public int length; public short send_type; public int rate; public byte channels; }; _pcm pcm; } The signature for my pcm object: $ javap -s -p VentriloEventData ... org.mangler.VentriloEventData$_pcm pcm; Signature: Lorg/mangler/VentriloEventData$_pcm; I am implementing a native JNI function called getevent, which will write to the fields in an instance of the VentriloEventData class. For what it's worth, it's defined and called in Java like so: public static native int getevent(VentriloEventData data); VentriloEventData data = new VentriloEventData(); getevent(data); And my JNI implementation of getevent: JNIEXPORT jint JNICALL Java_org_mangler_VentriloInterface_getevent(JNIEnv* env, jobject obj, jobject eventdata) { v3_event *ev = v3_get_event(V3_BLOCK); if(ev != NULL) { jclass event_class = (*env)->GetObjectClass(env, eventdata); // Event type. jfieldID type_field = (*env)->GetFieldID(env, event_class, "type", "S"); (*env)->SetShortField( env, eventdata, type_field, 1234 ); // Get PCM class. jfieldID pcm_field = (*env)->GetFieldID(env, event_class, "pcm", "Lorg/mangler/VentriloEventData$_pcm;"); jobject pcm = (*env)->GetObjectField( env, eventdata, pcm_field ); jclass pcm_class = (*env)->GetObjectClass(env, pcm); // Set PCM fields. jfieldID pcm_length_field = (*env)->GetFieldID(env, pcm_class, "length", "I"); (*env)->SetIntField( env, pcm, pcm_length_field, 1337 ); free(ev); } return 0; } The code above works fine for writing into the type field (that is not wrapped by the _pcm class). Once getevent is called, data.type is verified to be 1234 at the java side :) My problem is that the assertion "pcm != NULL" will fail. Note that pcm_field != NULL, which probably indicates that the signature to that field is correct... so there must be something wrong with my call to GetObjectField. It looks fine though if I compare it to the official JNI docs. Been bashing my head on this problem for the past 2 hours and I'm getting a little desperate.. hoping a different perspective will help me out on this one.

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  • ASP NET MVC (Please Hepl)

    - by rah.deex
    I'am a newbie n interest to leaarn aspnet mvc (vb) but there's too much application sample that using C#.. i just want to know how to wrote this code in VB <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<MvcGridSample.ViewModels.Shared.Grid<Customer, CustomerSearchForm>>" %> do you have any idea?? thx before -dix-

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  • Any book on building a complete web service?

    - by webservicesbuilder
    Hi All, Is there any book that can guide me building secure webservices. Adding xsds to WSDL Adding WS security policies to WSDL Any book that can describe how to put together a secure web service. the language shouldn't matter, but it should explain the concepts and help the reader to put together all the pieces required for building a secure web service. Thanks

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  • Silverlight Assembly.Load() only works with the full/strong name

    - by chris
    Apparently the implementation of Assembly.Load() in Silverlight needs a full/strong name. E.g. this works: Assembly.Load("MyAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=..."); while this will fail even if MyAssembly is already loaded: Assembly.Load("MyAssembly"); Is there a workaround so that it's possible to use the simple name?

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  • Does anyone here uses PHP-GTK? Is there a better alternative?

    - by levhita
    I had made some questions regarding php-gtk(there are only 4 php-gtk tagged questions and 3 are mine) and I end up answering myself because no one answer them. I know is a strange language selection but I was attracted to it because it runs on several OS's and the fact that I can reuse some of my code (also the apps end up looking good and I can make little installers in NSIS that just rocks). Is there a better alternative, that is free(as freedom) and can run on several platforms?

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  • pure as3 benefits to compiling with flex4 instead of flex3?

    - by jedierikb
    If I have a pure as3 project that I have been compiling with flex3 from mxmlc, is there any reason to switch to using the mxmlc with flex4? I can use all of the flash 10 language features like Vector, 3D, etc., so that is not a reason to switch (or is there something I can't do?). But maybe there is a performance boost? Or is the exact same compiling tool and the flex code base is the only difference?

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  • Are you a self taught programmer or did you take a programming course?

    - by workinprogress
    Lots of developers I know were self taught programmers including me. I was wondering how much of the developer community learned programming by taking a course in school or by experimenting, asking questions on forums, reading online articles, and just making it up as you go along? Post whether you were self taught or took classes, what language you program in, and anything else that may be interesting. P.S. Books count as self taught.

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  • Decompile an SWF

    - by Belgin Fish
    Hi What language would I need to use to decompile an swf file automatically on my server, not like a desktop app. A bit like http://www.showmycode.com/ And could anyone point me in the right direction to get started?

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  • Exporting Stata results

    - by Max M.
    I'm sure this is an issue anyone who uses Stata for publications or reports has run into: how do you conveniently export your output to something that can be parsed by a scripting language or Excel? There are a few ADO files that to this for specific commands (try findit tabout or findit outreg2). But what about exporting the output of the table command? Or the results of an anova? I'd love to hear about how Stata users address this problem for either specific commands or in general.

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  • What's the "revised syntax" in OCaml?

    - by aneccodeal
    When people refer to the "revised syntax" in OCaml, do they mean that this will become a new syntax for the language, or is it just an alternative syntax created in CamlP4? If it's the former, then when does the "revised syntax" become the "official syntax" of OCaml?

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  • How to build a complex table by using CSS?

    - by Relax
    Recently i ran into a complex table implementation, for example: tr1: | td1 | td2 | td3 | tr2: | td1 | td2 | tr3: | td1 | td2 | ... As this example shows, i want td1 are fixed with different width, td3 is also width fixed but at the right, td2 are all width auto to expand when screen radio changed. I'm wondering if there is a way to do this by using CSS?

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  • Google Maps show location based on user inputs

    - by Kiran Badi
    Hi I have an web application where in I have 4 fields in the form, like streetname,nearest street,zip,state and country.Based on this I need to show the location of this address in the google maps.I have to implement this functionality for GoogleMaps/Bing/ and Yahoo maps. Can someone point to correct api's for these.This is my first implementation of maps,so need some inputs.Appreciate if someone can point me to right direction.

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  • Programming interface

    - by user309010
    Hi All, I currently building a data collection system [mainly "EFM" - enterprise feed back management] using .NET. I was wondering if there is a possibility to provide the user to script and manipulate the objects - like a programming language but with minor functionalities Thanks

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  • What are some fun project ideas for a new Python developer?

    - by Sergio Tapia
    I'm new to Python 3 and so far it seems like a decent language. I really like the string manipulation methods you can use and they are pretty radical. :) I'm stuck however in thinking of a project to do with Python. Is there a site similar to Coding4Fun but for Python? Community Wiki because I think this question is really interesting. :D

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  • What is a RECURSIVE Function in PHP?

    - by Imran
    Can anyone please explain a recursive function to me in PHP (without using Fibonacci) in layman language and using examples? i was looking at an example but the Fibonacci totally lost me! Thank you in advance ;-) Also how often do you use them in web development?

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