【MATLAB与C的混合编程】之【C程序调用Matlab计算引擎】(3)

本就就针对网上到处流行的以“Matlab与C/C++混合编程”为题的例子进行调试。

此例已调试成功，代码如下：

#pragma comment( lib, "libmx.lib"  )
#pragma comment( lib, "libmex.lib" )
#pragma comment( lib, "libeng.lib" )
#include<windows.h>
#include "engine.h"
#include<iostream>
using namespace std;
int PASCAL WinMain (HINSTANCE hInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR     lpszCmdLine,
                    int       nCmdShow)
{
    Engine *ep;
    mxArray *P=NULL,*r=NULL;
    char buffer[301];
    double poly[4]={1,0,-2,5};//表示1*x^3+0*x^2-2*x+5

    if (!(ep=engOpen(NULL)))
    {
        fprintf(stderr,"\nCan't start MATLAB engine\n");
        return -1;
    }

    P=mxCreateDoubleMatrix(1,4,mxREAL);
    //mxSetClassName(P,"p");
    memcpy((char *)mxGetPr(P),(char *)poly, 4*sizeof(double));
    engPutVariable(ep,"p",P);
    engOutputBuffer(ep,buffer,300);
    engEvalString(ep,"disp(['多项式',poly2str(p,'x'),'的根']),r=roots(p)");
    MessageBox(NULL,buffer,"example2 展示MATLAB 引擎的应用",MB_OK);
    engClose(ep);
    mxDestroyArray(P);
    return 1;
}

------------------------------------------------------------------------

结果如图：

==============================================

注意事项：

1)加入#pragma comment( lib, "libmx.lib")等

2)WinMain函数一个字母都不能错int PASCAL WinMain (HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpszCmdLine,int nCmdShow)

3)engPutVariable(ep,"p",P);其他版本少了中间那个小p

4)其他注意见【MATLAB与C的混合编程】之【C程序调用Matlab计算引擎】(1)和【MATLAB与C的混合编程】之【C程序调用Matlab计算引擎】(2)