matlab 与 VC 混编函数参数传递<2>

最新推荐文章于 2016-09-22 14:59:08 发布

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最新推荐文章于 2016-09-22 14:59:08 发布

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文章标签： matlab c/c++ 开发工具

本文介绍了一段使用M代码实现的函数myadd2及其在C++环境中与MCR的交互过程，包括函数定义、参数传递、数据复制及内存管理。

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下面是这个例子用到的m代码。它定义了一个名为myadd2的函数：

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CODE:

function [y,z] = myadd2(a, b)

% dummy function, just to demonstrate the idea

y = a+b;

z = a+2*b;

end

VC Code

CODE:

#include "stdafx.h"

#include

#include "mclmcr.h"

#include "mclcppclass.h"

#include "libmyadd2.h"

int _tmain(int argc, _TCHAR* argv[])

{

std::cout << "Hello world!" << std::endl;

/* Initialize the MCR */

if( !mclInitializeApplication(NULL,0) )

{

std::cout << "Could not initialize the application!" << std::endl;

return -1;

}

// initialize lib

if( !libmyadd2Initialize())

{

std::cout << "Could not initialize libmyadd2!" << std::endl;

return -1;

}

try

{

// declare and initialize a

mwArray a(2, 2, mxDOUBLE_CLASS);

double *aData;

aData = new double[4];

int i;

for( i=0; i<4; ++i)

{

aData[i] = 1.0*i;

}

// print output

std::cout << "a = " << std::endl;

std::cout << aData[0] << ", " << aData[1] << std::endl;

std::cout << aData[2] << ", " << aData[3] << std::endl;

a.SetData(aData, 4);

// declare and initialize b

mwArray b(2, 2, mxDOUBLE_CLASS);

b(1,1) = 11.;

b(1,2) = 12.;

b(2,1) = 21.;

b(2,2) = 22.;

mwArray y(2, 2, mxDOUBLE_CLASS);

mwArray z(2, 2, mxDOUBLE_CLASS);

// call the function

myadd2(2, y, z, a, b);

// copy data from mwArray to C++ objects

// allocate outputs

double *yData, *zData;

yData = new double[4];

if( yData == NULL )

{

std::cout << "Failed to allocate memory for yData!" << std::endl;

return -1;

}

zData = new double[4];

if( zData == NULL )

{

std::cout << "Failed to allocate memory for zData!" << std::endl;

return -1;

}

// copy data from mwArray to C++

y.GetData(yData, 4);

z.GetData(zData, 4);

// print output

std::cout << "y = " << std::endl;

std::cout << yData[0] << ", " << yData[1] << std::endl;

std::cout << yData[2] << ", " << yData[3] << std::endl;

std::cout << "z = " << std::endl;

std::cout << zData[0] << ", " << zData[1] << std::endl;

std::cout << zData[2] << ", " << zData[3] << std::endl;

// deallocate memory

delete [] aData;

delete [] zData;

delete [] yData;

}

catch( const mwException& e)

{

std::cerr << e.what() << std::endl;

}

// terminate the lib

libmyadd2Terminate();

// terminate MCR

mclTerminateApplication();

return 0;

}