COM

class ATL_NO_VTABLE CYourClass : 
     public CComObjectRootEx<CComSingleThreadModel>,
     public CComCoClass<Csadfas, &CLSID_sadfas>,
     public IDispatchImpl<Isadfas, &IID_IBlah, &LIBID_ATLPROJLib>
{
     // .
     // Blah blah
     // .
 
     DECLARE_CLASSFACTORY_SINGLETON(CYourClass)
 
     // .
     // Blah blah
     // .
 

void MyGlobal()
{
     CComPtr<IMyInterface> spInt;
     if ( SUCCEEDED(spInt.CoCreateInstance(CLSID_YourCLSID)) )
     {
         spInt->YourMethod();
     }
}

void MyGlobal()
{
     CComPtr<IMyInterface> spInt;
     if ( SUCCEEDED(spInt.CoCreateInstance(CLSID_YourCLSID)) )
     {
         CYourClass* pClass = static_cast<CYourClass*>(spInt.p);
         pClass->YourMethod();
     }
}

// WARNING: POOR CODE - THIS NULLIFIES THE BENIFITS OF USING COM!
 
// Your class:
class clsA
{
public:
     clsB obj1; //class B obj
     clsC obj2; //class C obj
     char name[10];
     void show();
};
 
// In an IDL file:
HRESULT DirtyHack_PassInCPPObject([in]INT_PTR pObj);
 
// And in a .CPP file.
STDMETHODIMP CYouCOMObject::DirtyHack_PassInCPPObject(INT_PTR pObj)
{
     clsA* pA = reinterpret_cast<clsA*>(pObj);
 
     return S_OK;
}
 
// A call would look something like this:
clsA a;
spObj->DirtyHack_PassInCPPObject(reinterpret_cast<INT_PTR>(&a));