cfactory.h

COM技术内幕源码 ,随书原码

#ifndef __CFactory_h__
#define __CFactory_h__

#include "CUnknown.h"
///////////////////////////////////////////////////////////
 
// Forward reference
class CFactoryData ;

// Global data used by CFactory
extern CFactoryData g_FactoryDataArray[] ;
extern int g_cFactoryDataEntries ;

//////////////////////////////////////////////////////////
//
//  Component creation function
//
class CUnknown ;

typedef HRESULT (*FPCREATEINSTANCE)(IUnknown*, CUnknown**) ;

///////////////////////////////////////////////////////////
//
// CFactoryData
//   - Information CFactory needs to create a component
//     supported by the DLL
//
class CFactoryData
{
public:
	// The class ID for the component
	const CLSID* m_pCLSID ;

	// Pointer to the function that creates it
	FPCREATEINSTANCE CreateInstance ;

	// Name of the component to register in the registry
	const char* m_RegistryName ;

	// ProgID
	const char* m_szProgID ;

	// Version-independent ProgID
	const char* m_szVerIndProgID ;

	// Helper function for finding the class ID
	BOOL IsClassID(const CLSID& clsid) const
		{ return (*m_pCLSID == clsid) ;}

	// Type Library ID
	const GUID* m_pLIBID ;

	//
	// Out of process server support
	//

	// Pointer to running class factory for this component
	IClassFactory* m_pIClassFactory ;

	// Magic cookie to identify running object
	DWORD m_dwRegister ;
} ;


///////////////////////////////////////////////////////////
//
// Class Factory
//
class CFactory : public IClassFactory
{
public:
	// IUnknown
	virtual HRESULT __stdcall QueryInterface(const IID& iid, void** ppv) ;
	virtual ULONG   __stdcall AddRef() ;
	virtual ULONG   __stdcall Release() ;
	
	// IClassFactory
	virtual HRESULT __stdcall CreateInstance(IUnknown* pUnknownOuter,
	                                         const IID& iid,
	                                         void** ppv) ;
	virtual HRESULT __stdcall LockServer(BOOL bLock) ; 

	// Constructor - Pass pointer to data of component to create.
	CFactory(const CFactoryData* pFactoryData) ;

	// Destructor
	~CFactory() { }

	//
	// Static FactoryData support functions
	//

	// DllGetClassObject support
	static HRESULT GetClassObject(const CLSID& clsid, 
	                              const IID& iid, 
	                              void** ppv) ;

	// Helper function for DllCanUnloadNow 
 	static BOOL IsLocked()
		{ return (s_cServerLocks > 0) ;}

	// Functions to [un]register all components
	static HRESULT RegisterAll() ;
	static HRESULT UnregisterAll() ;

	// Function to determine if component can be unloaded
	static HRESULT CanUnloadNow() ;


#ifdef _OUTPROC_SERVER_
	//
	// Out-of-process server support
	//

	static BOOL StartFactories() ;
	static void StopFactories() ;

	static DWORD s_dwThreadID ;

	// Shut down the application.
	static void CloseExe()
	{
		if (CanUnloadNow() == S_OK)
		{
			::PostThreadMessage(s_dwThreadID, WM_QUIT, 0, 0) ;
		}
	}
#else
	// CloseExe doesn't do anything if we are in process.
	static void CloseExe() { /*Empty*/ } 
#endif

public:
	// Reference Count
	LONG m_cRef ;

	// Pointer to information about class this factory creates
	const CFactoryData* m_pFactoryData ;

	// Count of locks
	static LONG s_cServerLocks ;   

	// Module handle
	static HMODULE s_hModule ;
} ;

#endif