spaceship.cpp

VC技术内幕

// Spaceship.cpp  pseudo-OLE command-line application
#include <stdio.h>
#include <stddef.h> // for offsetof in METHOD_PROLOGUE
#include <ASSERT.h>
#include "Interface.h"
#include "Spaceship.h"

CSpaceshipFactory g_factory;

//----------member functions-----------------------------------------
BOOL CSpaceshipFactory::ExternalQueryInterface(int nIid,
                                               void** ppvObj) {
TRACE("Entering CSpaceshipFactory::ExternalQueryInterface--nIid = %d\n" ,nIid);
    switch (nIid) {
    case IID_IUnknown:
    case IID_IClassFactory:
      *ppvObj = &m_xClassFactory;
      break;
    default:
      *ppvObj = NULL;
      return FALSE;
    }
    ExternalAddRef();
    return TRUE;
}                               

BOOL CSpaceshipFactory::XClassFactory::QueryInterface(int nIid,
                                                      void** ppvObj) {
  TRACE("Entering CSpaceshipFactory::XClassFactory::QueryInterface--nIid = %d\n", nIid);
    METHOD_PROLOGUE(CSpaceshipFactory, ClassFactory) // makes pThis
    return pThis->
        ExternalQueryInterface(nIid, ppvObj); // delegate to
                                              //  CSpaceshipFactory
}                               

BOOL CSpaceshipFactory::XClassFactory::CreateInstance(int nIid,
                                                      void** ppvObj) {
    TRACE("Entering CSpaceshipFactory::XClassFactory::CreateInstance\n");
    METHOD_PROLOGUE(CSpaceshipFactory, ClassFactory) // makes pThis
    CSpaceship* pObj = new CSpaceship();
    if (pObj->ExternalQueryInterface(nIid, ppvObj)) {
        pObj->ExternalRelease(); // balance reference count
        return TRUE;
    }
    return FALSE;
}

DWORD CSpaceshipFactory::XClassFactory::Release() {
    TRACE("Entering CSpaceshipFactory::XClassFactory::Release\n");
    METHOD_PROLOGUE(CSpaceshipFactory, ClassFactory) // makes pThis
    return pThis->ExternalRelease(); // delegate to CSimulatedCmdTarget
}                               

DWORD CSpaceshipFactory::XClassFactory::AddRef() {
    TRACE("Entering CSpaceshipFactory::XClassFactory::AddRef\n");
    METHOD_PROLOGUE(CSpaceshipFactory, ClassFactory) // makes pThis
    return pThis->ExternalAddRef(); // delegate to CSimulatedCmdTarget
}

BOOL CSpaceship::ExternalQueryInterface(int nIid, void** ppvObj) {
    TRACE("Entering CSpaceship::ExternalQueryInterface--nIid = %d\n",
           nIid);
    switch (nIid) {
    case IID_IUnknown:
    case IID_IMotion:
      *ppvObj = &m_xMotion; // Both IMotion and IVisual are derived
      break;                //  from IUnknown, so either pointer will do
    case IID_IVisual:
      *ppvObj = &m_xVisual;
      break;
    default:
      *ppvObj = NULL;
      return FALSE;
    }
    ExternalAddRef();
    return TRUE;
}                               

BOOL CSpaceship::XMotion::QueryInterface(int nIid, void** ppvObj) {
    TRACE("Entering CSpaceship::XMotion::QueryInterface--nIid =   %d\n", nIid);
    METHOD_PROLOGUE(CSpaceship, Motion) // makes pThis
    return pThis->ExternalQueryInterface(nIid, ppvObj); // delegate to
                                                        //  CSpaceship
}                               

DWORD CSpaceship::XMotion::Release() {
    TRACE("Entering CSpaceship::XMotion::Release\n");
    METHOD_PROLOGUE(CSpaceship, Motion) // makes pThis
    return pThis->ExternalRelease(); // delegate to CSimulatedCmdTarget
}                               

DWORD CSpaceship::XMotion::AddRef() {
    TRACE("Entering CSpaceship::XMotion::AddRef\n");
    METHOD_PROLOGUE(CSpaceship, Motion) // makes pThis
    return pThis->ExternalAddRef(); // delegate to CSimulatedCmdTarget
}                               

void CSpaceship::XMotion::Fly() {
    TRACE("Entering CSpaceship::XMotion::Fly\n");
    METHOD_PROLOGUE(CSpaceship, Motion) // makes pThis
    TRACE("this = %p, pThis = %p\n", this, pThis);
    TRACE("m_nPosition = %d\n", pThis->m_nPosition);
    TRACE("m_nAcceleration = %d\n", pThis->m_nAcceleration);
}

int& CSpaceship::XMotion::GetPosition() {
    TRACE("Entering CSpaceship::XMotion::GetPosition\n");
    METHOD_PROLOGUE(CSpaceship, Motion) // makes pThis
    TRACE("this = %p, pThis = %p\n", this, pThis);
    TRACE("m_nPosition = %d\n", pThis->m_nPosition);
    TRACE("m_nAcceleration = %d\n", pThis->m_nAcceleration);
    return pThis->m_nPosition;
}

BOOL CSpaceship::XVisual::QueryInterface(int nIid, void** ppvObj) {
    TRACE("Entering CSpaceship::XVisual::QueryInterface--nIid =  %d\n", nIid);
    METHOD_PROLOGUE(CSpaceship, Visual) // makes pThis
    return pThis->ExternalQueryInterface(nIid, ppvObj); // delegate to
                                                        //  CSpaceship
}

DWORD CSpaceship::XVisual::Release() {
    TRACE("Entering CSpaceship::XVisual::Release\n");
    METHOD_PROLOGUE(CSpaceship, Visual) // makes pThis
    return pThis->ExternalRelease(); // delegate to CSimulatedCmdTarget
}                               

DWORD CSpaceship::XVisual::AddRef() {
    TRACE("Entering CSpaceship::XVisual::AddRef\n");
    METHOD_PROLOGUE(CSpaceship, Visual) // makes pThis
    return pThis->ExternalAddRef(); // delegate to CSimulatedCmdTarget
}                               

void CSpaceship::XVisual::Display() {
    TRACE("Entering CSpaceship::XVisual::Display\n");
    METHOD_PROLOGUE(CSpaceship, Visual) // makes pThis
    TRACE("this = %p, pThis = %p\n", this, pThis);
    TRACE("m_nPosition = %d\n", pThis->m_nPosition);
    TRACE("m_nColor = %d\n", pThis->m_nColor);
}

//----------simulates OLE component ----------------------------------
// In real COM, this would be DllGetClassObject, which would be called
// whenever a client called CoGetClassObject    
    
BOOL GetClassObject(int nClsid, int nIid, void** ppvObj)
{
    ASSERT(nClsid == CLSID_CSpaceship);
    ASSERT((nIid == IID_IUnknown) || (nIid == IID_IClassFactory));
    return g_factory.ExternalQueryInterface(nIid, ppvObj);
    // refcount is 2, which prevents accidental deletion
}