matlab to visual c++ interface

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i want to use matlab function in visual c++
anybudy have any idea

Posted 2-Nov-11 7:17am

pranav_30

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Maximilien · Answer 1 · 2011-11-02T08:04:00

Solution 1

What about that :

Calling MATLAB Engine from C/C++ and Fortran Programs[^]

Posted 2-Nov-11 8:04am

Maximilien

Comments

Albert Holguin 2-Nov-11 14:10pm

Be advised that calling the engine from your code means you're still bound to Matlab directly... in another words, you have to install (and therefore distribute) the Matlab engine for your application to work, given the cost of Matlab, I can't imagine this is by no means free.

Maximilien 2-Nov-11 14:13pm

Yeah, just figured that out (engine vs. DLL/lib code)
In any cases, if you want to call mathlab functions you will still need to link to mathlab dll/libs, and you will need to already have them , and if you ship to customers, you will need to ship mathlab dll/lib to clients (royalties, one-time fees,...)

Albert Holguin 2-Nov-11 14:23pm

Don't know the pricing structure of using their DLLs after you've compiled the source, but installing the engine is not the same as distributing the DLLs you would need if you compiled the source. Installing the engine means the computer has access to the entire heart of Matlab (minus the IDE). I believe if you compile the code you just need some interfacing DLLs. Either way, Matlab is not cheap so pricing is always a consideration. That's why I also brought up the option of just using Matlab to develop/learn the algorithms then developing your own routines.

pranav_30 2-Nov-11 14:25pm

i am able to call matlab function using.
Engine *ep;
ep = engOpen("");
engEvalString(ep,"x = (1:1:10);" );
engEvalString(ep, "y = x.^2;");
engEvalString(ep, "plot(x,y);" );
ep = engOpen("");

now tel me if i make executable of my project and give to the client. then client pc need matlab installed for runnig the project

Albert Holguin 2-Nov-11 14:33pm

It needs the "engine"... which is what Matlab calls its internal mathematical engine (as opposed to other IDE components/toolboxes/simulink/etc.). So you would have to redistribute that... so make sure that you're doing it legally.

pranav_30 2-Nov-11 15:00pm

is there any alternate way to achive this interface. bcoz its not feasible option to redistribute entire matlb software

Albert Holguin 2-Nov-11 15:29pm

Look at the link I provided in my solution and see what you have to redistribute when you use the compiler...

pranav_30 2-Nov-11 15:43pm

but for that i have to purchase the matlab... at present i have downloaded matlab from torent n i m using that copy..

Albert Holguin 2-Nov-11 15:56pm

well... that's illegal... sorry, can't help you there. :)

Albert Holguin 2-Nov-11 16:00pm

If you want to use an open source alternative to Matlab, try Octave[^]... not sure about their code compilation options... but it is free and open source.

Maximilien 2-Nov-11 15:47pm

well, well,well...

pranav_30 2-Nov-11 15:58pm

hey guys plz let me know interfacing... i want to do project on image warping with 9 contrrol point.. i search lot.. bt not get anything.. so i have decided to take help of matlab.

Albert Holguin 2-Nov-11 16:01pm

We've told you the options you have... it's not our fault that you're using an illegal copy of Matlab in the first place.

Legor 3-Nov-11 4:50am

Are you really expecting that it's legal to somehow make use of a licensed software like Matlab in your own product and than offer that piece of software to other clients for free? Make use of freely available libraries for image processing (e.g. ITK or openCV).

pranav_30 3-Nov-11 10:39am

m getting following error

1>sharedcpp.obj : error LNK2001: unresolved external symbol ___MCC_sharedcpp_component_data
1>D:\pranav_study\final_work\matlab_demo\Debug\matlab_demo.exe : fatal error LNK1120: 1 unresolved externals
1>Build log was saved at "file://d:\pranav_study\final_work\matlab_demo\matlab_demo\Debug\BuildLog.htm"
1>matlab_demo - 2 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ======

plz let me what is wrong going over here and what should i do with genrated .dll file after deployment

Albert Holguin · Answer 2 · 2011-11-02T08:08:00

Solution 2

Matlab offers a compiler[^] (probably at an extra charge, not sure though) to compile their source into a shared library. Once compiled, you should be able to access the code as a dll or a static lib (see compiler specs for what they support).

Alternatively, you can code your own routines based on what you've learned. This approach will probably allow you to optimize your code and run it faster than just using what the Matlab compiler puts out and is generally a better approach for a commercial product.

Posted 2-Nov-11 8:08am

Albert Holguin

Comments

pranav_30 3-Nov-11 1:48am

hey bro thanks now i am able to create dll n some cpp file and object file using deployment tool... can u tel me how can i use this dll file to my visual c++ project..

pranav_30 3-Nov-11 2:42am

i m getting following error

1>sharedcpp.obj : error LNK2001: unresolved external symbol ___MCC_sharedcpp_component_data
1>D:\pranav_study\final_work\matlab_demo\Debug\matlab_demo.exe : fatal error LNK1120: 1 unresolved externals
1>Build log was saved at "file://d:\pranav_study\final_work\matlab_demo\matlab_demo\Debug\BuildLog.htm"
1>matlab_demo - 2 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========