A very simple COM server without ATL or MFC

// The following ifdef block is the standard way of creating macros which make exporting 
// from a DLL simpler. All files within this DLL are compiled with the MYSERV_EXPORTS
// symbol defined on the command line. this symbol should not be defined on any project
// that uses this DLL. This way any other project whose source files include this file see 
// MYSERV_API functions as being imported from a DLL, wheras this DLL sees symbols
// defined with this macro as being exported.
#ifdef MYSERV_EXPORTS
#define MYSERV_API __declspec(dllexport)
#else
#define MYSERV_API __declspec(dllimport)
#endif

#include <objbase.h>

STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppvOut);
STDAPI DllCanUnloadNow(void);
STDAPI DllRegisterServer(void);
STDAPI DllUnregisterServer(void);