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MATLAB Shared Library

, 30 Dec 2003
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Using MATLAB compiler to build a shared library (DLL) from m-File.

Sample screenshot - Matlab Shared Library


Some times it is required that we build a shared library (DLL) from an m-file. M-files are functions that are written in Matlab editor and can be used from Matlab command prompt. In m-files, we employ Matlab built-in functions or toolbox functions to compute something. In my past articles, I showed you some ways to use Matlab engine (vis. API, C++ class or Matlab engine API) for employing Matlab built-in functions, but what about functions that we develop? How can we use them in VC? Is there any interface? This article shows you an idea to employ your own Matlab functions.

Shared Libraries

Shared libraries or DLLs are files that export some functions. We can use exported functions in any language. Here is a brief instruction to build shared libraries from Matlab m-files:

  1. Compile your m-file into a DLL (from Matlab command prompt):
    mcc -t -L C -W lib:mylib -T link:lib -h <M-file> libmmfile.mlib

    The -t option tells the Matlab compiler to translate the m-file to the target language. The -L option specifies the target language, which is chosen to be C. The -W option tells the Matlab compiler to build a wrapper for the library with the name specified by "lib:". The -T option tells the compiler what stage should be reached and for what intentions. Here we link our application together to build a shared library (DLL). Specifying libmmfile.mlib tells Matlab compiler to link against Matlab m-file math routine.

    This step will produce mylib.dll, mylib.lib and mylib.h. For debugging purposes, you can add the -g switch to produce a DLL suitable for debugging in MSVC.

    For example, I wrote my own mean function and saved it as MeanFunction.m:

    function y=MeanFunction(x)
    for i=1:n

    and compiled it with mcc:

    mcc -t -L C -W lib:MeanFunctionLib -T link:lib MeanFunction.m libmmfile.mlib
  2. Create your project in VC. In your main CPP file, include your function header file and add the related library. Here I create a simple console application. Make sure to call initialization and termination routines from your code before and after of calling the m-file function.

    #include "stdafx.h"
    #include "matlab.h"
    #include "MeanFunctionLib.h"
    #pragma comment(lib, "libmx.lib")
    #pragma comment(lib, "libmatlb.lib")
    #pragma comment(lib, "libmat.lib")
    #pragma comment(lib, "libmmfile.lib")
    #pragma comment(lib, "MeanFunctionLib.lib")
    int main(int argc, char* argv[])
        mxArray* result;
        mxArray* x;
        double myArray[5]={10.2, 3, 6.3, 5.4, 5.9};
        x=mxCreateDoubleMatrix(1, 5, mxREAL);
        memcpy(mxGetPr(x), myArray, 5 * sizeof(double));
        return 0;
  3. Build your project.

Notice that you must use Matlab C API or Matlab C++ class library to use mxArray or mwArray. For more information, refer to my articles:



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About the Author

A. Riazi
CEO Misbah3Com
Iran (Islamic Republic Of) Iran (Islamic Republic Of)
I was born in Shiraz, a very beautiful famous city in Iran. I started programming when I was 12 years old with GWBASIC. Since now, I worked with various programming languages from Basic, Foxpro, C/C++, Visual Basic, Pascal to MATLAB and now Visual C++.
I graduated from Iran University of Science & Technology in Communication Eng., and now work as a system programmer for a telecommunication industry.
I wrote several programs and drivers for Synthesizers, Power Amplifiers, GPIB, GPS devices, Radio cards, Data Acqusition cards and so many related devices.
I'm author of several books like Learning C (primary and advanced), Learning Visual Basic, API application for VB, Teach Yourself Object Oriented Programming (OOP) and etc.
I'm winner of January, May, August 2003 and April 2005 best article of month competetion, my articles are:

You can see list of my articles, by clicking here

Comments and Discussions

Questiondo we have something like matlab framework? Pinmemberadnanmn29-Mar-08 3:14 
AnswerRe: do we have something like matlab framework? Pinmemberadnanmn31-Mar-08 1:38 
Generalmcc of Matlab 7.0 PinmemberJunaid Jameel13-Mar-08 5:21 
GeneralRe: mcc of Matlab 7.0 Pinmemberharbujel28-Jul-08 0:22 
Generalmatlab .net builder PinmemberPaul Stephen10-Feb-08 18:59 
QuestionI have some problem using m files in C++ , can you help me? PinmemberVahid - Rostami17-Dec-07 17:16 
Questioncan i use matlab inbuild function .... Pinmembervishal33421-Jul-07 3:21 
AnswerRe: can i use matlab inbuild function .... PinmemberElvedinHamzagic21-Oct-07 4:37 
QuestionCalling a dll without header in matlab Pinmemberahad4451-Jul-07 22:32 
GeneralMatlab dll in Borland C++ Builder 6.0 PinmemberElvedin809-Jun-07 6:59 
GeneralRe: Matlab dll in Borland C++ Builder 6.0 PinmemberElvedinHamzagic11-Jun-07 8:30 
GeneralRe: Matlab dll in Borland C++ Builder 6.0 Pinmemberhenriqueamorim8-Oct-07 5:19 
AnswerRe: Matlab dll in Borland C++ Builder 6.0 PinmemberElvedinHamzagic21-Oct-07 4:19 
GeneralRe: Matlab dll in Borland C++ Builder 6.0 PinmemberElvedinHamzagic21-Oct-07 5:05 
Generalmcc Compiler error Pinmemberkumar Shwetaketu21-May-07 4:54 
QuestionTo access a Matlab code in my C program PinmemberSindhu Krishnana E P10-May-07 22:25 
GeneralUsing M-files within C++ code Pinmemberxxpatanaxx8-May-07 12:39 
Generalerror compile Pinmembermehdiing5-May-07 8:56 
GeneralRe: error compile PinmemberA. Riazi6-May-07 3:24 
GeneralRe: error compile Pinmemberkumar Shwetaketu20-May-07 2:57 
QuestionEAccess Violation with mxCreate* PinmemberNowC4-May-07 13:31 
Questioni want to import a C code in matlab what i should do Pinmemberfaizi ji3-May-07 21:00 
AnswerRe: i want to import a C code in matlab what i should do PinmemberSindhu Krishnana E P10-May-07 22:07 
QuestionHow ca I do the download of the Pinmembergiovanitonel24-Nov-06 1:37 
AnswerRe: How ca I do the download of the PinmemberA. Riazi24-Nov-06 1:45 
QuestionHow to access MATLAB functions in C# PinmemberShakeel Mumtaz28-Oct-06 20:05 
AnswerRe: How to access MATLAB functions in C# PinmemberSindhu Krishnana E P10-May-07 4:09 
GeneralRe: How to access MATLAB functions in C# PinmemberShakeel Mumtaz11-May-07 8:16 
QuestionRe: How to access MATLAB functions in C# Pinmemberkumar dhruva16-Jun-11 0:48 
GeneralMCC: Compiling a Matlab function that gets integer arguments Pinmemberamitkagian16-Oct-06 7:00 
QuestionCompatibility between a Matlab dll and Delphi PinmemberPititeBato11-Oct-06 23:39 
AnswerRe: Compatibility between a Matlab dll and Delphi PinmemberElvedinHamzagic21-Oct-07 4:52 
QuestionCalling MatLab DLL from VB6 "Can't find DLL entry point..." error Pinmembericesktr122-Aug-06 8:53 
AnswerRe: Calling MatLab DLL from VB6 "Can't find DLL entry point..." error PinmemberKashif Ishaq13-Sep-07 21:05 
Generalusing dll c++ through matlab Pinmembersmurffeddine20-Jun-06 0:53 
QuestionI cant merge the DLL with the C++ Pinmemberschone24-May-06 7:17 
GeneralMCC!!!!!???????????????????!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Pinmemberlamionne18-Mar-06 2:56 
GeneralRe: MCC!!!!!???????????????????!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Pinmemberkumar Shwetaketu21-May-07 19:58 
Generalplease help me Pinmemberlamionne18-Mar-06 2:42 
Generalstudent needsc help in matlab mcc Pinmemberlamionne16-Mar-06 0:22 
QuestionMat lab .dll and connect it with the C# project?? PinmemberWhirl_777-Dec-05 10:28 
GeneralMATLAB 2 C PinmemberRafid97419-Nov-05 8:50 
General0xC0000005: Access Violation Pinmembervadimpl31-Aug-05 19:27 
GeneralRe: 0xC0000005: Access Violation Pinmemberjhwurmbach23-Nov-05 7:34 
GeneralRe: 0xC0000005: Access Violation PinmemberBonta Marian S23-Jun-07 23:11 
GeneralRe: 0xC0000005: Access Violation [modified] Pinmemberjhwurmbach1-Jul-07 23:18 
AnswerRe: 0xC0000005: Access Violation PinmemberBonta Marian S4-Jul-07 7:55 
GeneralNew Library PinsussAnonymous27-Jun-05 10:51 
GeneralUsing COMObject from Matlab to C# PinsussAnonymous30-Apr-05 12:00 
GeneralRe: Using COMObject from Matlab to C# PinsussAnonymous4-Aug-05 7:16 

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