COM技术内幕学习笔记

1.在下面的连接中下载<<COM技术内幕>>电子版图书,此书为.PDG格式文件,可以使用超星阅览器打开阅读.

http://218.108.41.12/vchome/book/allbook.asp

2.书中的代码整理:

1)

 

#include <iostream.h>
#include <objbase.h>

void trace(const char* pMsg)
{
 cout<<pMsg<<endl;
}

interface IX
{
 virtual void _stdcall Fx1() = 0;
 virtual void _stdcall Fx2() = 0;
};

interface IY
{
 virtual void _stdcall Fy1() = 0;
 virtual void _stdcall Fy2() = 0;
};

class CA:public IX,
         public IY
{
public:
 virtual void _stdcall Fx1()
 {
  cout<<"CA::Fx1"<<endl;
 }
    virtual void _stdcall Fx2()
 {
  cout<<"CA::Fx2"<<endl;
 }
 virtual void _stdcall Fy1()
 {
  cout<<"CA::Fy1"<<endl;
 }
 virtual void _stdcall Fy2()
 {
  cout<<"CA::Fy2"<<endl;
 }
};

int main()
{
 trace("clinet: create an instance of the component.");
 CA* pA = new CA;
 IX* pIX = pA;
 trace("client: use the IX interface.");
 pIX->Fx1();
 pIX->Fx2();
 IY* pIY = pA;
 trace("client: use the IY interfacea.");
 pIY->Fy1();
 pIY->Fy2();
 trace("client: Delet the component.");
 delete pA;
 return 0;
}

2)

#include <iostream.h>
#include <objbase.h>

void trace(const char* msg)
{
 cout<<msg<<endl;
}

interface IX: IUnknown
{
 virtual void _stdcall Fx() = 0;
};

interface IY:IUnknown
{
 virtual void _stdcall Fy() = 0;
};

interface IZ:IUnknown
{
 virtual void _stdcall Fz() = 0;
};

extern const IID IID_IX;
extern const IID IID_IY;
extern const IID IID_IZ;

class CA:public IX,
         public IY
{
 virtual HRESULT _stdcall QueryInterface(const IID& iid, void **ppv);
 virtual ULONG _stdcall AddRef() {return 0;}
 virtual ULONG _stdcall Release() {return 0;}

 virtual void _stdcall Fx() {cout<<"Fx"<<endl;}
 virtual void _stdcall Fy() {cout<<"Fy"<<endl;}
};

HRESULT _stdcall CA::QueryInterface(const IID& iid, void** ppv)
{
 if(iid == IID_IUnknown)
 {
  trace("QueryInterface: Return pointer to IUnknown.");
  *ppv = static_cast<IX*>(this);
 }
 else if(iid == IID_IX)
 {
  trace("QueryInterface: Return pointer to IX.");
  *ppv = static_cast<IX*>(this);
 }
 else if (iid == IID_IY)
 {
  trace("QueryInterface: Return pointer to IY.");
  *ppv = static_cast<IY*>(this);
 }
 else
 {
  trace("QueryInterface: Interface not supported.");
  *ppv = NULL;
  return E_NOINTERFACE;
 }
 reinterpret_cast<IUnknown*>(*ppv)->AddRef();
 return S_OK;
}

IUnknown* CreateInstance()
{
 IUnknown* PI = static_cast<IX*>(new CA);
 PI->AddRef();
 return PI;
}

static const IID IID_IX =
{0x32bb8320,0xb41b,0x11cf,{0xa6,0xbb,0x0,0x80,0xc7,0xb2,0xd6,0x82}};

static const IID IID_IY =
{0x32bb8321,0xb41b,0x11cf,{0xa6,0xbb,0x0,0x80,0xc7,0xb2,0xd6,0x82}};

static const IID IID_IZ =
{0x32bb8322,0xb41b,0x11cf,{0xa6,0xbb,0x0,0x80,0xc7,0xb2,0xd6,0x82}};

int main()
{
 HRESULT hr;
 trace("client: Get an IUnknown pointer.");
 IUnknown* pIUnknown = CreateInstance();

 trace("client: Get interface IX.");
 IX* pIX = NULL;
 hr = pIUnknown->QueryInterface(IID_IX,(void**)&pIX);
 if(SUCCEEDED(hr))
 {
  trace("client: succeeded getting IX.");
  pIX->Fx();
 }

 trace("client: Get interface IY.");
 IY* pIY = NULL;
 hr = pIUnknown->QueryInterface(IID_IY,(void**)&pIY);
 if(SUCCEEDED(hr))
 {
  trace("client: succeeded getting IY.");
  pIY->Fy();
 }

 trace("client: Get interface IZ.");
 IZ* pIZ = NULL;
 hr = pIUnknown->QueryInterface(IID_IZ,(void**)&pIZ);
 if(SUCCEEDED(hr))
 {
  trace("client: succeeded getting IZ.");
  pIZ->Fz();
 }
 else
 {
  trace("client: could not get interface IZ.");
 }

 trace("client: Get interface IY from interface IX.");
 IY* pIYfromIX = NULL;
 hr = pIX->QueryInterface(IID_IY,(void**)&pIYfromIX);
 if (SUCCEEDED(hr))
 {
  trace("client: succeeded getting IY.");
  pIYfromIX->Fy();
 }

 trace("client: Get interface IUnknown from IY.");
 IUnknown* pIUnknownFromIY = NULL;
 hr = pIY->QueryInterface(IID_IUnknown,(void**)&pIUnknownFromIY);
 if(SUCCEEDED(hr))
 {
  cout<<"Are the IUnknown pointers equal?"<<endl;
  if(pIUnknownFromIY == pIUnknown)
  {
   cout<<"yes,pIUnknownFromIY == pIUnknown."<<endl;
  }
  else
  {
   cout<<"no,pIUnknownFromIY != pIUnknown."<<endl;
  }
 }
  delete pIUnknown;
  return 0;
}

3)

#include <iostream.h>
#include <objbase.h>

void trace(const char* msg)
{
 cout<<msg<<endl;
}

interface IX: IUnknown
{
 virtual void _stdcall Fx() = 0;
};

interface IY:IUnknown
{
 virtual void _stdcall Fy() = 0;
};

interface IZ:IUnknown
{
 virtual void _stdcall Fz() = 0;
};

extern const IID IID_IX;
extern const IID IID_IY;
extern const IID IID_IZ;

class CA:public IX,
         public IY
{
 virtual HRESULT _stdcall QueryInterface(const IID& iid, void **ppv);
 virtual ULONG _stdcall AddRef();
 virtual ULONG _stdcall Release();

 virtual void _stdcall Fx() {cout<<"Fx"<<endl;}
 virtual void _stdcall Fy() {cout<<"Fy"<<endl;}

public:
 CA():m_cRef(0){}
 ~CA(){trace("CA: Destroy self.");}
private:
 long m_cRef;
};

HRESULT _stdcall CA::QueryInterface(const IID& iid, void** ppv)
{
 if(iid == IID_IUnknown)
 {
  trace("CA QI: Return pointer to IUnknown.");
  *ppv = static_cast<IX*>(this);
 }
 else if(iid == IID_IX)
 {
  trace("CA QI: Return pointer to IX.");
  *ppv = static_cast<IX*>(this);
 }
 else if (iid == IID_IY)
 {
  trace("CA QI: Return pointer to IY.");
  *ppv = static_cast<IY*>(this);
 }
 else
 {
  trace("QueryInterface: Interface not supported.");
  *ppv = NULL;
  return E_NOINTERFACE;
 }
 reinterpret_cast<IUnknown*>(*ppv)->AddRef();
 return S_OK;
}

ULONG _stdcall CA::AddRef()
{
 cout<<"CA:  AddRef = "<<m_cRef + 1<<'.'<<endl;
 return InterlockedIncrement(&m_cRef);
}

ULONG _stdcall CA::Release()
{
 cout<<"CA:  Release = "<<m_cRef - 1<<'.'<<endl;
  if(InterlockedDecrement(&m_cRef) == 0)
  {
   delete this;
   return 0;
  }
  return m_cRef;
}

IUnknown* CreateInstance()
{
 IUnknown* PI = static_cast<IX*>(new CA);
 PI->AddRef();
 return PI;
}

static const IID IID_IX =
{0x32bb8320,0xb41b,0x11cf,{0xa6,0xbb,0x0,0x80,0xc7,0xb2,0xd6,0x82}};

static const IID IID_IY =
{0x32bb8321,0xb41b,0x11cf,{0xa6,0xbb,0x0,0x80,0xc7,0xb2,0xd6,0x82}};

static const IID IID_IZ =
{0x32bb8322,0xb41b,0x11cf,{0xa6,0xbb,0x0,0x80,0xc7,0xb2,0xd6,0x82}};

int main()
{
 HRESULT hr;
 trace("client: Get an IUnknown pointer.");
 IUnknown* pIUnknown = CreateInstance();

 trace("client: Get interface IX.");
 IX* pIX = NULL;
 hr = pIUnknown->QueryInterface(IID_IX,(void**)&pIX);
 if(SUCCEEDED(hr))
 {
  trace("client: succeeded getting IX.");
  pIX->Fx();
  pIX->Release();
 }

 trace("client: Get interface IY.");
 IY* pIY = NULL;
 hr = pIUnknown->QueryInterface(IID_IY,(void**)&pIY);
 if(SUCCEEDED(hr))
 {
  trace("client: succeeded getting IY.");
  pIY->Fy();
  pIY->Release();
 }

 trace("client: Get interface IZ.");
 IZ* pIZ = NULL;
 hr = pIUnknown->QueryInterface(IID_IZ,(void**)&pIZ);
 if(SUCCEEDED(hr))
 {
  trace("client: succeeded getting IZ.");
  pIZ->Fz();
  pIZ->Release();
 }
 else
 {
  trace("client: could not get interface IZ.");
 }
 pIUnknown->Release();
  return 0;
}