// ?{7B55D765-68A6-404e-99E2-CA9ABC389A27}
static ? const ??GUID?IID_IUnknown9 = ?
{? 0x7b55d765 ,? 0x68a6 ,? 0x404e ,? {? 0x99 ,? 0xe2 ,? 0xca ,? 0x9a ,? 0xbc ,? 0x38 ,? 0x9a ,? 0x27 ?} ?} ;
// ?{060CAA56-33E9-4c79-BE5B-0F70A5DDFE15}
static ? const ?GUID?CLSID_myadd? = ?
{? 0x60caa56 ,? 0x33e9 ,? 0x4c79 ,? {? 0xbe ,? 0x5b ,? 0xf ,? 0x70 ,? 0xa5 ,? 0xdd ,? 0xfe ,? 0x15 ?} ?} ;
// ?{9A03B1AC-8253-4e69-971F-1E88E817F6FA}
static ? const ?GUID?IID_IAdd? = ?
{? 0x9a03b1ac ,? 0x8253 ,? 0x4e69 ,? {? 0x97 ,? 0x1f ,? 0x1e ,? 0x88 ,? 0xe8 ,? 0x17 ,? 0xf6 ,? 0xfa ?} ?} ;
// ?{F03E6879-75E9-4cbc-A123-2AD92545869C}
static ? const ?GUID?IID_ISubcat? = ?
{? 0xf03e6879 ,? 0x75e9 ,? 0x4cbc ,? {? 0xa1 ,? 0x23 ,? 0x2a ,? 0xd9 ,? 0x25 ,? 0x45 ,? 0x86 ,? 0x9c ?} ?} ;

class ?IUnknown9
{
public :
???? virtual ?HRESULT?QueryInterface(REFIID?riid,? void ? ** ppvObject) = 0 ;
??????? virtual ?ULONG?AddRef( void ) = 0 ;
??????? virtual ?ULONG?Release( void ) = 0 ;
protected :
private :
} ;
class ?IAdd: public ?IUnknown9
{
public :
???? virtual ? int ?add( int ?, int ?) = 0 ;
} ;
class ??ISubcat: public ?IUnknown9
{
public :
????? virtual ? int ??sub( int , int ?) = 0 ;
protected :
private :
} ;

class ?Cmyadd: public ?IAdd, public ?ISubcat
{
public :
????
????HRESULT?QueryInterface(REFIID?riid,? void ? ** ppvObject)
???? {
???????? if ?(riid == IID_IUnknown9)
???????? {
?????????????? * ppvObject = (IAdd * ?) this ;
??????????????AddRef();
?????????????? return ?S_OK;
????????} else ? if ?(riid == IID_IAdd)
???????? {
??????????????? * ppvObject = (IAdd * ) this ;
???????????????AddRef();
??????????????? return ?S_OK;
????????} else ? if ?(riid == IID_ISubcat)
???????? {
???????????? * ppvObject = (ISubcat * ) this ;
????????????AddRef();
???????????? return ?S_OK;
????????} else
???????????? return ?E_UNEXPECTED;


????}
????ULONG?AddRef()
???? {
?????? ++ m_ref;
??????cout << " \n?object?count?= " << m_ref;
?????? return ?m_ref;
????}
????ULONG?Release()
???? {
???????? -- m_ref;
???????? if ?(m_ref == 0 )
???????? {
????????????delete? this ;
????????????cout << " \n?object?delete " ;
????????}
???????? return ?m_ref;
????}
????Cmyadd()
???? {
??????m_ref = 0 ;
????}
??? int ?add( int ?a, int ?b?)
??? {
??? return ?a + b;
???}
??? int ?sub( int ?a, int ?b?)
??? {
??????? return ?a - b;

???}
protected :
private :
????ULONG?m_ref;
} ;



?HRESULT?DlllGetClassObject(REFCLSID?rclsid,?REFIID?riid,?LPVOID * ?ppv)
{
????AFX_MANAGE_STATE(AfxGetStaticModuleState());
???? if ?(rclsid == CLSID_myadd)
???? {
????????Cmyadd? * ?pthis = new ?Cmyadd;
????????pthis -> QueryInterface(riid,ppv);
???????? return ?S_OK;
????}
???? return ?E_UNEXPECTED;
}



在exe中
HANDLE?handle = ::LoadLibrary( " .\\dllcom1.dll " );

????typedef??HRESULT?( * ?pc)(REFCLSID?rclsid,?REFIID?riid,?LPVOID * ?ppv);

????????pc?p = (pc)::GetProcAddress((HMODULE)handle, " DlllGetClassObject " );
????IAdd? * ?padd = NULL;
????ISubcat * ?psub = NULL;
????HRESULT?hr = p(CLSID_myadd,IID_IAdd,( void ** ) & padd);
???? if ?(FAILED(hr))
???? {
????????cout << " \n?can?not?get?com " ;
???????? return ? 1 ;
????}
????hr = padd -> QueryInterface(IID_ISubcat,( void ** ) & psub);
???? if ?(FAILED(hr))
???? {
????????cout << " \n?can?not?get?interface " ;
???????? return ? 1 ;
????}

cout << " \n? " << padd -> add( 5 , 5 );
????padd -> Release();
????cout << " \n? " << psub -> sub( 10 , 5 );
????psub -> Release();
??cout << " \n " ;