VC++ ATL/COM - Step 5 COM Client Test Application in C++

5. COM Client Test Application in C++

If you write the following code, even if you have defined IMathCtrl interface from IUnknown it would work.

// SFTComClient.cpp : Defines the entry point for the console application.

#include <stdio.h>

#include <tchar.h>

#define _ATL_CSTRING_EXPLICIT_CONSTRUCTORS // some CString constructors will be explicit

#include <atlbase.h>

#include <atlstr.h>

#include <iostream>

#include "../SFTComServer/SFTComServer.h"

#include "../SFTComServer/SFTComServer_i.c"

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

{

::CoInitialize(NULL);

IMathControl *pmc = NULL;

HRESULT hResult = ::CoCreateInstance(CLSID_MathControl, NULL, CLSCTX_INPROC_SERVER, IID_IMathControl, (LPVOID*) &pmc);

if(FAILED(hResult))

{

std::cout << "Failed in creating COM Component";

return 0;

}

DWORD result = 0;

pmc->AddTwoNumbers(10, 15, &result);

std::cout << "Result : " << result << "\n";

pmc->AddTwoNumbers(10, 25, &result);

std::cout << "Result : " << result << "\n";

pmc->AddTwoNumbers(10, 35, &result);

std::cout << "Result : " << result << "\n\n";

return 0;

}