client.cpp

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 // client.cpp
#define _WIN32_DCOM
#include <iostream.h>  // For cout
#include "Component with FTM\component.h" // Generated by MIDL

DWORD threadid;

void __stdcall MyThread(IStream* pScream)
{
	HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
	if(FAILED(hr))
		cout << "CoInitializeEx failed" << endl;

	ISum* pSum;
	hr = CoGetInterfaceAndReleaseStream(pScream, IID_ISum, (void**)&pSum);
	if(FAILED(hr))
		cout << "CoGetInterfaceAndReleaseStream failed" << endl;

	cout << "Adding numbers 0 to 50000 in MTA thread " << GetCurrentThreadId() << endl;

	for(int count = 0; count < 50000; count++)
	{
		int sum;
		hr = pSum->Sum(count, count, &sum);
//		cout << "Client: Calling Sum(" << count << ", " << count << ") = " << sum << endl;
	}

	pSum->Release();
	CoUninitialize();

	PostThreadMessage(threadid, WM_QUIT, 0, 0);
}

void main()
{
	DWORD time = GetTickCount();

	threadid = GetCurrentThreadId();

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

	ISum* pSum;
	hr = CoCreateInstance(CLSID_InsideCOM, NULL, CLSCTX_INPROC_SERVER, IID_ISum, (void**)&pSum);
	if(FAILED(hr))
		cout << "CoCreateInstance failed" << endl;

	IStream* pStream;
	CoMarshalInterThreadInterfaceInStream(IID_ISum, pSum, &pStream);

	DWORD newthreadid;
	HANDLE thread_handle = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)MyThread, (void*)pStream, 0, &newthreadid);

	cout << "Adding numbers 0 to 50000 in STA thread " << GetCurrentThreadId() << endl;

	for(int count = 0; count < 50000; count++)
	{
		int sum = 0;
		hr = pSum->Sum(count, count, &sum);
//		cout << "Client: Calling Sum(" << count << ", " << count << ") = " << sum << endl;
	}

	hr = pSum->Release();

	MSG msg;
	while(GetMessage(&msg, 0, 0, 0))
		DispatchMessage(&msg);
	
	CoUninitialize();

	cout << "Time elapsed = " << GetTickCount() - time << " milliseconds." << endl;
}