Call COM Objects in Visual C++ Programs

Note

You must choose a Microsoft^® compiler to compile and use any COM object.

Use the COM object you have created as follows:

Create a Visual C++^® program in a file named matlab_com_example.cpp with the following code:

#include <iostream>
using namespace std;

#include "mycomponent\src\mycomponent_idl.h" 
#include "mycomponent\src\mycomponent_idl_i.c"

int main() {     
// Initialize argument variables     
             VARIANT x, y, out1;
//Initialize the COM library     
             HRESULT hr = CoInitialize(NULL);   
//Create an instance of the COM object you created    
             Imycomponentclass *pImycomponentclass;     
             hr=CoCreateInstance
               (CLSID_mycomponentclass, NULL, CLSCTX_INPROC_SERVER, 
                IID_Imycomponentclass,(void **)&pImycomponentclass);
// Set the input arguments to the COM method 
             x.vt=VT_R8; 
             y.vt=VT_R8;     
             x.dblVal=7.3;
             y.dblVal=1946.0;      
// Access the method with arguments and receive the output out1 
             hr=(pImycomponentclass -> adddoubles(1,&out1,x,y)); 
// Print the output     
             cout << "The input values were " << x.dblVal << " and "
                  << y.dblVal << ".\n";
             cout << "The output of feeding the inputs into the adddoubles method is " 
                  << out1.dblVal << ".\n";      
// Uninitialize COM     
             CoUninitialize();     
             return 0;
}

In the MATLAB^® Command Window, compile the program as follows:
```
mbuild matlab_com_example.cpp
```

When you run the executable, the program displays two numbers and their sum, as returned by the COM object’s adddoubles.