Matlab C++ Interface

sadel — Sun, 08 Nov 2009 18:57:01 -0500

Hi all!
I use this version of Microsoft Visual C++ Express Edition
Microsoft Visual Studio 2005
Version 8.0.50727.867
Microsoft .NET Framework
Version 2.0.50727 SP2
Installed Edition: VC Express
I use this version of Matlab:
MATLAB Version 7.8.0.347 (R2009a)
and i use this operating System: Microsoft Windows Vista Version 6.0 (Build 6001: Service Pack 1) Home premium

I am trying to compile 'engwindemo.cpp' example but i take this error message:

1>Compiling...
1>win.cpp
1>.\win.cpp(39) : error C2664: 'MessageBox' : cannot convert parameter 2 from 'LPSTR' to 'LPCTSTR'
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>.\win.cpp(104) : error C2664: 'MessageBox' : cannot convert parameter 2 from 'LPSTR' to 'LPCTSTR'
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>.\win.cpp(113) : error C2664: 'MessageBox' : cannot convert parameter 2 from 'LPSTR' to 'LPCTSTR'
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>.\win.cpp(122) : error C2664: 'MessageBox' : cannot convert parameter 2 from 'LPSTR' to 'LPCTSTR'
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

Can anyone help me?

Thank you in advance!

Re: Matlab C++ Interface

sadel — Mon, 09 Nov 2009 10:30:04 -0500

"sadel " <sadel2006@yahoo.gr> wrote in message <hd749t$fqk$1@fred.mathworks.com>...
> Hi all!
> I use this version of Microsoft Visual C++ Express Edition
> Microsoft Visual Studio 2005
> Version 8.0.50727.867
> Microsoft .NET Framework
> Version 2.0.50727 SP2
> Installed Edition: VC Express
> I use this version of Matlab:
> MATLAB Version 7.8.0.347 (R2009a)
> and i use this operating System: Microsoft Windows Vista Version 6.0 (Build 6001: Service Pack 1) Home premium
>
> I am trying to compile 'engwindemo.cpp' example but i take this error message:
>
> 1>Compiling...
> 1>win.cpp
> 1>.\win.cpp(39) : error C2664: 'MessageBox' : cannot convert parameter 2 from 'LPSTR' to 'LPCTSTR'
> 1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
> 1>.\win.cpp(104) : error C2664: 'MessageBox' : cannot convert parameter 2 from 'LPSTR' to 'LPCTSTR'
> 1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
> 1>.\win.cpp(113) : error C2664: 'MessageBox' : cannot convert parameter 2 from 'LPSTR' to 'LPCTSTR'
> 1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
> 1>.\win.cpp(122) : error C2664: 'MessageBox' : cannot convert parameter 2 from 'LPSTR' to 'LPCTSTR'
> 1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
>
> Can anyone help me?
>
> Thank you in advance!

The code is:

/*
* engwindemo.c
*
* This is a simple program that illustrates how to call the MATLAB
* Engine functions from a C program for windows
*
* Copyright 1984-2003 The MathWorks, Inc.
*/
/* $Revision: 1.10.4.1 $ */
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "engine.h"
#pragma comment (lib,"libmx.lib")
#pragma comment (lib,"libut.lib")
#pragma comment (lib,"libeng.lib")
#define BUFSIZE 256

static double Areal[6] = { 1, 2, 3, 4, 5, 6 };

int PASCAL WinMain (HINSTANCE hInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszCmdLine,
                    int nCmdShow)

{
Engine *ep;
mxArray *T = NULL, *a = NULL, *d = NULL;
char buffer[BUFSIZE+1];
double *Dreal, *Dimag;
double time[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

/*
* Start the MATLAB engine
*/
if (!(ep = engOpen(NULL))) {
MessageBox ((HWND)NULL, (LPSTR)"Can't start MATLAB engine",
(LPSTR) "Engwindemo.c", MB_OK);
exit(-1);
}

/*
* PART I
*
* For the first half of this demonstration, we will send data
* to MATLAB, analyze the data, and plot the result.
*/

/*
* Create a variable from our data
*/
T = mxCreateDoubleMatrix(1, 10, mxREAL);
memcpy((char *) mxGetPr(T), (char *) time, 10*sizeof(double));

/*
* Place the variable T into the MATLAB workspace
*/
engPutVariable(ep, "T", T);

/*
* Evaluate a function of time, distance = (1/2)g.*t.^2
* (g is the acceleration due to gravity)
*/
engEvalString(ep, "D = .5.*(-9.8).*T.^2;");

/*
* Plot the result
*/
engEvalString(ep, "plot(T,D);");
engEvalString(ep, "title('Position vs. Time for a falling object');");
engEvalString(ep, "xlabel('Time (seconds)');");
engEvalString(ep, "ylabel('Position (meters)');");

/*
* PART II
*
* For the second half of this demonstration, we will create another mxArray
* put it into MATLAB and calculate its eigen values
*
*/

a = mxCreateDoubleMatrix(3, 2, mxREAL);
memcpy((char *) mxGetPr(a), (char *) Areal, 6*sizeof(double));
engPutVariable(ep, "A", a);

/*
* Calculate the eigen value
*/
engEvalString(ep, "d = eig(A*A')");

/*
* Use engOutputBuffer to capture MATLAB output. Ensure first that
* the buffer is always NULL terminated.
*/
buffer[BUFSIZE] = '\0';
engOutputBuffer(ep, buffer, BUFSIZE);

/*
* the evaluate string returns the result into the
* output buffer.
*/
engEvalString(ep, "whos");
MessageBox ((HWND)NULL, (LPSTR)buffer, (LPSTR) "MATLAB - whos", MB_OK);

/*
* Get the eigen value mxArray
*/
d = engGetVariable(ep, "d");
engClose(ep);

if (d == NULL) {
MessageBox ((HWND)NULL, (LPSTR)"Get Array Failed", (LPSTR)"Engwindemo.c", MB_OK);
}
else {
Dreal = mxGetPr(d);
Dimag = mxGetPi(d);
if (Dimag)
sprintf(buffer,"Eigenval 2: %g+%gi",Dreal[1],Dimag[1]);
else
sprintf(buffer,"Eigenval 2: %g",Dreal[1]);
MessageBox ((HWND)NULL, (LPSTR)buffer, (LPSTR)"Engwindemo.c", MB_OK);
mxDestroyArray(d);
}

/*
* We're done! Free memory, close MATLAB engine and exit.
*/
mxDestroyArray(T);
mxDestroyArray(a);

return(0);
}

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