client.cpp

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#define _WIN32_DCOM
#include <iostream.h>
#include "component with registration\component.h" // Generated by MIDL

// {10000002-0000-0000-0000-000000000001}
const CLSID CLSID_InsideCOM = {0x10000002,0x0000,0x0000,
    {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01}};

void main()
{
    IUnknown* pUnknown;
    ISum* pSum;

    HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
    if(FAILED(hr))
        cout << "CoInitializeEx failed. " << endl;

    hr = CoCreateInstance(CLSID_InsideCOM, NULL, 
        CLSCTX_INPROC_SERVER, IID_IUnknown, (void**)&pUnknown);
    if(FAILED(hr))
        cout << "CoCreateInstance failed. " << endl;

    hr = pUnknown->QueryInterface(IID_ISum, (void**)&pSum);
    if(FAILED(hr))
        cout << "IID_ISum not supported. " << endl;

    pUnknown->Release();

    int sum;
    hr = pSum->Sum(2, 3, &sum);
    if(SUCCEEDED(hr))
        cout << "Client: Calling Sum(2, 3) = " << sum << endl;

    pSum->Release();

    CoUninitialize();
}