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  • Will GTK's pango and cairo work well in Coca and MFC applications.

    - by Lothar
    I'm writing a GUI program and decided to go native on all platforms. But for all the stuff i need to draw myself i would like to use the same drawing routines because font and unicode handling is so difficult and complex. Do you see any negative points in useing Pango/Cairo. Well on MacOSX i havent succeded installing Pango/Cairo yet. Looks like a bad Omen.

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  • Where can I get material for learning EBNF?

    - by yesraaj
    Extended Backus–Naur Form: EBNF I'm very new to parsing concepts. Where can I get sufficiently easy to read and follow material for writing a grammar for the boost::spirit library, which uses a grammar similar to EBNF? Currently I am looking into EBNF from Wikipedia.

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  • Optimizing spacing of mesh containing a given set of points

    - by Feynman
    I tried to summarize the this as best as possible in the title. I am writing an initial value problem solver in the most general way possible. I start with an arbitrary number of initial values at arbitrary locations (inside a boundary.) The first part of my program creates a mesh/grid (I am not sure which is the correct nuance), with N points total, that contains all the initial values. My goal is to optimize the mesh such that the spacing is as uniform as possible. My solver seems to work half decently (it needs some more obscure debugging that is not relevant here.) I am starting with one dimension. I intend to generalize the algorithm to an arbitrary number of dimensions once I get it working consistently. I am writing my code in fortran, but feel free to reply with pseudocode or the language of your choice. Allow me to elaborate with an example: Say I am working on a closed interval [1,10] xmin=1 xmax=10 Say I have 3 initial points: xmin, 5 and xmax num_ivc=3 known(num_ivc)=[xmin,5,xmax] //my arrays start at 1. Assume "known" starts sorted I store my mesh/grid points in an array called coord. Say I want 10 points total in my mesh/grid. N=10 coord(10) Remember, all this is arbitrary--except the variable names of course. The algorithm should set coord to {1,2,3,4,5,6,7,8,9,10} Now for a less trivial example: num_ivc=3 known(num_ivc)=[xmin,5.5,xmax or just num_ivc=1 known(num_ivc)=[5.5] Now, would you have 5 evenly spaced points on the interval [1, 5.5] and 5 evenly spaced points on the interval (5.5, 10]? But there is more space between 1 and 5.5 than between 5.5 and 10. So would you have 6 points on [1, 5.5] followed by 4 on (5.5 to 10]. The key is to minimize the difference in spacing. I have been working on this for 2 days straight and I can assure you it is a lot trickier than it sounds. I have written code that only works if N is large only works if N is small only works if it the known points are close together only works if it the known points are far apart only works if at least one of the known points is near a boundary only works if none of the known points are near a boundary So as you can see, I have coded the gamut of almost-solutions. I cannot figure out a way to get it to perform equally well in all possible scenarios (that is, create the optimum spacing.)

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  • Advantage of creating a generic repository vs. specific repository for each object?

    - by LuckyLindy
    We are developing an ASP.NET MVC application, and are now building the repository/service classes. I'm wondering if there are any major advantages to creating a generic IRepository interface that all repositories implement, vs. each Repository having its own unique interface and set of methods. For example: a generic IRepository interface might look like (taken from this answer): public interface IRepository : IDisposable { T[] GetAll<T>(); T[] GetAll<T>(Expression<Func<T, bool>> filter); T GetSingle<T>(Expression<Func<T, bool>> filter); T GetSingle<T>(Expression<Func<T, bool>> filter, List<Expression<Func<T, object>>> subSelectors); void Delete<T>(T entity); void Add<T>(T entity); int SaveChanges(); DbTransaction BeginTransaction(); } Each Repository would implement this interface (e.g. CustomerRepository:IRepository, ProductRepository:IRepository, etc). The alternate that we've followed in prior projects would be: public interface IInvoiceRepository : IDisposable { EntityCollection<InvoiceEntity> GetAllInvoices(int accountId); EntityCollection<InvoiceEntity> GetAllInvoices(DateTime theDate); InvoiceEntity GetSingleInvoice(int id, bool doFetchRelated); InvoiceEntity GetSingleInvoice(DateTime invoiceDate, int accountId); //unique InvoiceEntity CreateInvoice(); InvoiceLineEntity CreateInvoiceLine(); void SaveChanges(InvoiceEntity); //handles inserts or updates void DeleteInvoice(InvoiceEntity); void DeleteInvoiceLine(InvoiceLineEntity); } In the second case, the expressions (LINQ or otherwise) would be entirely contained in the Repository implementation, whoever is implementing the service just needs to know which repository function to call. I guess I don't see the advantage of writing all the expression syntax in the service class and passing to the repository. Wouldn't this mean easy-to-messup LINQ code is being duplicated in many cases? For example, in our old invoicing system, we call InvoiceRepository.GetSingleInvoice(DateTime invoiceDate, int accountId) from a few different services (Customer, Invoice, Account, etc). That seems much cleaner than writing the following in multiple places: rep.GetSingle(x => x.AccountId = someId && x.InvoiceDate = someDate.Date); The only disadvantage I see to using the specific approach is that we could end up with many permutations of Get* functions, but this still seems preferable to pushing the expression logic up into the Service classes. What am I missing?

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  • Dynamic linking in Visual Studio

    - by ILya
    I have to link dynamically with OpenSSL libeay32.dll. I'm writing native c++ console application using Visual C++ Express 2008. I'm including a header evp.h from OpenSSL distribution. Building and...: error LNK2001: unresolved external symbol _EVP_aes_256_cbc error LNK2001: unresolved external symbol _EVP_DecryptInit error LNK2001: unresolved external symbol _EVP_CIPHER_CTX_init How to make calls to libeay32.dll methods? I don't know where to specify it's filename

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  • C++ type-checking at compile-time

    - by Masterofpsi
    Hi, all. I'm pretty new to C++, and I'm writing a small library (mostly for my own projects) in C++. In the process of designing a type hierarchy, I've run into the problem of defining the assignment operator. I've taken the basic approach that was eventually reached in this article, which is that for every class MyClass in a hierarchy derived from a class Base you define two assignment operators like so: class MyClass: public Base { public: MyClass& operator =(MyClass const& rhs); virtual MyClass& operator =(Base const& rhs); }; // automatically gets defined, so we make it call the virtual function below MyClass& MyClass::operator =(MyClass const& rhs); { return (*this = static_cast<Base const&>(rhs)); } MyClass& MyClass::operator =(Base const& rhs); { assert(typeid(rhs) == typeid(*this)); // assigning to different types is a logical error MyClass const& casted_rhs = dynamic_cast<MyClass const&>(rhs); try { // allocate new variables Base::operator =(rhs); } catch(...) { // delete the allocated variables throw; } // assign to member variables } The part I'm concerned with is the assertion for type equality. Since I'm writing a library, where assertions will presumably be compiled out of the final result, this has led me to go with a scheme that looks more like this: class MyClass: public Base { public: operator =(MyClass const& rhs); // etc virtual inline MyClass& operator =(Base const& rhs) { assert(typeid(rhs) == typeid(*this)); return this->set(static_cast<Base const&>(rhs)); } private: MyClass& set(Base const& rhs); // same basic thing }; But I've been wondering if I could check the types at compile-time. I looked into Boost.TypeTraits, and I came close by doing BOOST_MPL_ASSERT((boost::is_same<BOOST_TYPEOF(*this), BOOST_TYPEOF(rhs)>));, but since rhs is declared as a reference to the parent class and not the derived class, it choked. Now that I think about it, my reasoning seems silly -- I was hoping that since the function was inline, it would be able to check the actual parameters themselves, but of course the preprocessor always gets run before the compiler. But I was wondering if anyone knew of any other way I could enforce this kind of check at compile-time.

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  • System.exit(0) in java

    - by Ram
    I am writing an application program in java. If i need to exit from the application can i use system.exit or should i use some other method, which is good practice. If calling system.exit is not good practice then tell the reason and tell the alternative way to exit from the application.

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  • How to validate a xml schema

    - by Alexander Kjäll
    I'm writing a xml schema (a xsd) to describe the format our partners should send us data in. And I'm havening a hard time find a tool that can validate the xsd file that i have written. The best way I have found so far is to write an example input xml file and try to validate that with the xsd. But that doesn't feel like a best practice maneuver. How should I validate a xml schema?

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  • Getting content with images into the Web Browser control without temporary files

    - by Revision17
    For a client server application, I'd like to display content with a web browser control with images without writing temporary files to the disk. I've tried using mht files via documentstream and documenttext, but the web browser control isn't smart enough to recognize mht files. I would use data URI images, however most computers this will be installed on use IE6 or 7. Are there any other options for this?

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  • Anchor Window to Screen Edges in C#/WPF

    - by Kirk
    I've decided to teach myself C# by writing a music player in Visual Studio 2010. I went with WPF because from what I hear it sounds like it will be a good base to skin from. I want to program my window with the behavior where if the window comes to the edge of a screen (within 10px or so) it will snap to the screen edge. What's the best way to go about this?

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  • OS X terminal command to resolve path of an alias

    - by Josh
    I'm writing a shell script which will rsync files from remote machines, some linux, some macs, to a central backup server. The macs have folders on the root level containing aliases of all files/folders which need to be backed up. What is a terminal command I can use to resolve the path to the files/folders the aliases point to? (I'll need to pass these paths to rsync)

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  • Why use Buildr instead of Ant or Maven?

    - by Scott Markwell
    http://buildr.apache.org/ http://ant.apache.org/ http://maven.apache.org/ What does another build tool targeted at Java really get me? Is it so hard to write a plugin using Java versus writing it in Ruby? If you use Buildr over another tool, why? Side question: How many build systems does the Apache foundation need targeted at Java?

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  • Getting the source .rst file path in Sphinx extension

    - by Mikko Ohtamaa
    I am writing a Sphinx extension and I need to know the document page source code file system path (.rst file location) to extract some version control system information of it. How can I get this information in my event handler / which event handler I should use? Example: # This package may contain traces of nuts def on_html_page_context(app, pagename, templatename, context, doctree): import ipdb ; ipdb.set_trace() if doctree: print doctree.source def setup(app): app.require_sphinx('1.0') app.connect('html-page-context', on_html_page_context)

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  • Using Message Queue on Windows Mobile 2003

    - by Fitzroy Wright
    Does anyone know where I can find the cab file that will allow me to use Microsoft Message Queues on a Windows Mobile 2003 device? I am writing application that needs to use Microsoft Message Queue on a Windows Mobile 2003 device. Apparently message queue was never installed on the device. I have scoured the web and can find no cab files for Msmq for windows mobile 2003. everything reffers to windows mobile 5 and when I try that the setup fails.

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  • Deploy only cube schema, without processing

    - by Ken Yao
    Is there a way to only deploy cube schema, but without processing the cube. It seems in Visual Studio, when yo deploy a cube, by default, it is "Deploy and Process". The problem is processing takes so much time, and my main purpose is just writing some MDX script and see if it works well against the cube structure. It seems processing whole cube is just over kill. So I ask.

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  • IE8 is subtracting wrong in JavaScript / jQuery?

    - by Oscar Godson
    In every browser, Win/Mac, Chrome, Safari, Firefox, Opera, IE6, and IE7 they ALL get the following console output: 352 254 But in IE8 I get: 414 434 454 474 Here is my JS/jQuery code: $('#top-breadcrumbs').children('a').each(function(i){ if(!$(this).hasClass('permanent')){ if(permItemWidth+rmItemWidth > $('#top-breadcrumbs').width()){ $(this).addClass('removed'); rmItemWidth = rmItemWidth-$(this).width()+20; } } }); The log code i have above is writing the NEW rmItemWidth value after its been reset in that 2nd if

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  • WordPress Multi Language Help

    - by Cameron
    I have a WordPress website that needs to have its articles in multiple languages. The authors will be writing the articles themselves so I don't need an automatic translation tool. The plan is that a user can choose a language from a drop-down list which will then show the different language. Any ideas on how I can do this?

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  • Unit testing an iPhone static library with XCode 3

    - by teabot
    I am writing a number of static libraries for the iPhone and wish also to have suites of unit tests. XCode 3 provides templates for both static libraries and unit tests but I am wondering how they should fit together in a static library project? In my static library project I have created a target for unit testing but expect to also create an executable to kick off the unit tests than run against the classes in the static library. What is the procedure for doing this?

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