This basic npapi plugin is written in C. I'm developing on Mac and using xcode the project compiles and works. But I would like it to be in C++, what should I do to convert this to a C++ project? Or is there a similar example available in C++?
Thanks in advance!
Rename BasicPlugin.c to BasicPlugin.cc (or .cpp, or whatever C++ suffix you like). .Do this from the Xcode UI, so the project will be updated automatically.
There is no step 2. Once the file is being treated as a C++ file by the compiler, you can add all all the C++ you want. C++ is a superset of C, so all the existing code should work as-is.
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I am using unity3D for the first time to develop a game.I have written a code in c++ using Opencv and the code consist on many files.Now I want to apply the result computed by c++ code to a 3D character.
How i can use my c++ code in unity.Please help me.Remember I am using OpenCV Libraries in my c++ Code.
Thanks!!
You need to write a DLL file and use it within Unity. There is many examples on how to do so.
http://docs.unity3d.com/Manual/Plugins.html
If you have some money you can also purchase the Unity source code that is written in c++ though that seems a bit overkill.
did some googlefu...
C++ is not a scripting language, and can only be used with Unity in the form of plug-ins (in the Pro version). C# is closer in syntax to C++ than Javascript is.
http://answers.unity3d.com/questions/12809/can-i-use-c-as-a-scripting-lanques-for-unity.html
(couldn't find anything that contradicted that)
although these might be of interest:
https://gamedev.stackexchange.com/questions/82518/is-it-possible-to-use-c-with-unity-instead-of-c
http://blogs.unity3d.com/2014/05/20/the-future-of-scripting-in-unity/
I made a cocoa touch static library in iOS in which I have C++ classes (.h and .cpp files).
I built the project successfully, but when I include this library (having .a extension) and any .h file, I get a compilation Error.
How can I add this library in my objective-C project and use the C++ classes?
Your problem is likely that the .h header contains C++ code. You should read up on "compilation units". In short, there's no way to tell what language a header file is written in for the compiler. Therefore, it always uses the language of the source file that includes the header. So if you include a C++ header from a .m file, it will not work.
But there is a solution: Apple invented a "new language" it calls Objective-C++ that lets you write both C++ and Objective-C statements in the same file. For every ObjC file that uses a C++ header, you have to change the file name suffix of the source file that uses it from .m (ObjC) to .mm (ObjC++), which means the source files will be able to compile both ObjC and C++ headers.
Of course, you may not want to change all your files to be ObjC++. For one, C++ (and by extension Objective-C++) is a language with much more complex syntax than C and Objective-C, so your compile times will be longer, and also, C++ behaves differently in some aspects than C (and by extension, ObjC++ behaves a bit differently than ObjC).
What people usually do is constrain the C++ parts to their implementation files, and keep C++ out of the header. They write an Objective-C class that "wraps around" the C++ class, and provides methods that call the corresponding C++ methods on the C++ object. Then any ObjC file in your project can include that class, without having to turn on the ObjC++ compiler itself, which internally ("secretly") uses ObjC++ to call the C++ code.
For some useful tricks on how to hide C++ code inside an ObjC class, see Can I separate C++ main function and classes from Objective-C and/or C routines at compile and link?
Most probably you just should rename your .m files which are objective-c specific to .mm files that can accept C++ code (objective-c++).
Second is to check if everything it depends on is properly included before your library header.
Also check the architecture you have built your library for. If you run on an emulator - it should be x86, if for deploying to device - arm.
If you built the .a on the same system, there shouldn't be a problem #includeing its headers and linking against it.
I have some source code in C/C++. I have to make static library to use in my iPhone application. is there any third party tool to create static library for armv6/armv7 ?
this link will help you create a static library in xcode ...
http://www.icodeblog.com/2011/04/07/creating-static-libraries-for-ios/
just rename the .m file to .mm file and write your c/c++ implementation code in it....
try it for a small function first and if it works for you can implement all your classes in it...
Please make sure when you try to use this library in any other project in XCODE , only use .mm extension for all your files even the appdelegate... hope this helps.
I would recommend iOS Universal Framework. I have used it to create a number of static frameworks that I link against my application projects. It works like a charm and is really easy to setup - no need to come up with your own complicated shell scripts.
It adds a template for a new target project type, which you can then import and use just like an ordinary Apple framework. I would recommend setting up a workspace containing both the framework project and application project, that way the dependencies are handled automatically by Xcode.
In general, you DO NOT WANT to link to a static lib that is made with another compiler than the one used to compile the lib. Static libs are not really portable between compilers, since static lib formats are not covered by C/C++ standards. Due to name mangling and other formatting differences, you may not be able to link at all, or worse, it seems to work but injects bugs. Worse, if you use the standard library from your compiler in your lib, it will create horrible name collisions when someone links to your lib and they don't use an IDENTICAL version of the standard library!
Publish the lib using the compiler you expect them to be using. And if you must use the standard library, then you have to make sure they have the same version you have. Really, you should just have them compile the lib themselves or prebuild it for each compiler you support. It sucks, but that's the reality of it as it stands today.
Is it possible to link a C# library compiled using monotouch with an objective-C front end in a single application, or does the app have to be all or nothing?
It is possible but you aren't going to get any help from the MonoTouch tooling and you can't get away from the fact that you still have to have the Mono runtime to execute your C# code.
In order to provide the Mono runtime to the Objective-C app, the runtime will have to be embedded into the app. The MonoTouch site has some docs on how to do this here and you can find more technical details about embedding Mono into your application here.
MonoTouch, when compiling your C# code, produces .m and .s files that are used by Objective-C to call that code. These files will need to be included in the consuming Objective-C project but MonoTouch cleans up those files after they've been used. In order to keep mtouch, the MonoTouch compiler, from deleting the .m and .s files, use the --keeptemp option when invoking the compiler. You can find a good sample Makefile here to help you figure out how to call mtouch correctly from the command line.
Finally, you will need the full version of MonoTouch in order to do this. The trial version will not generate the .s files.
I want to be able to browse through the source code of an iPhone application in windows. I do not want to compile and run the code, just need to have some kind of tool that understands the Objective-C code and iPhone application source structure. Something that view the source code as a whole (project-based) and ideally can link different classes and methods. Something more than just a plain editor with code styling and something less than a full feature IDE. Do you suggest any tools?
Most editors will support Objective-C syntax highlighting. Personally I use VIM or NotePad++. I would recommend NotePad++ for ease of use. But as far as I know there is no 'IDE' for Objective-C for Windows.
I use jEdit if I need to see the source code in Windows. Pretty much handles all the structure and syntax highlighting of objective C.
EDIT: Its an editor. Not a IDE. But with your needs of just viewing code, I guess it must suffice.
If you want a bit more than just syntax highlighting, GNUStep has an IDE called PRoject Center. GNUStep can run on Windows, so allegedly Project Center will too.
Emacs has good syntax and indentation support for Objective-C, for example it can indent the method calls the way Xcode does (based on ':') and there's a Windows version of it available here.
Though it's not an IDE, most of the time I use it for Obj-C/GNUstep without much problems.
If you use something like ctags to tag your source code you could use any editor with support for ctags.
It looks like ctags does not support Objective-C directly, but it is fairly easy to add a new language configuration to ctags.