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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
//*****************************************************************************
// ClassFactory.h
//
//
// Class factories are used by the pluming in COM to activate new objects.
// This module contains the class factory code to instantiate the debugger
// objects described in <cordb.h>.
//
//*****************************************************************************
#ifndef __ClassFactory__h__
#define __ClassFactory__h__
#include "disp.h"
// This typedef is for a function which will create a new instance of an object.
typedef HRESULT (* PFN_CREATE_OBJ)(REFIID riid, void **ppvObject);
//*****************************************************************************
// This structure is used to declare a global list of coclasses. The class
// factory object is created with a pointer to the correct one of these, so
// that when create instance is called, it can be created.
//*****************************************************************************
struct COCLASS_REGISTER
{
const GUID *pClsid; // Class ID of the coclass.
LPCWSTR szProgID; // Prog ID of the class.
PFN_CREATE_OBJ pfnCreateObject; // Creation function for an instance.
};
//*****************************************************************************
// One class factory object satifies all of our clsid's, to reduce overall
// code bloat.
//*****************************************************************************
class MDClassFactory :
public IClassFactory
{
MDClassFactory() { } // Can't use without data.
public:
MDClassFactory(const COCLASS_REGISTER *pCoClass)
: m_cRef(1), m_pCoClass(pCoClass)
{ }
virtual ~MDClassFactory() {}
//
// IUnknown methods.
//
virtual HRESULT STDMETHODCALLTYPE QueryInterface(
REFIID riid,
void **ppvObject);
virtual ULONG STDMETHODCALLTYPE AddRef()
{
return InterlockedIncrement(&m_cRef);
}
virtual ULONG STDMETHODCALLTYPE Release()
{
LONG cRef = InterlockedDecrement(&m_cRef);
if (cRef <= 0)
delete this;
return (cRef);
}
//
// IClassFactory methods.
//
virtual HRESULT STDMETHODCALLTYPE CreateInstance(
IUnknown *pUnkOuter,
REFIID riid,
void **ppvObject);
virtual HRESULT STDMETHODCALLTYPE LockServer(
BOOL fLock);
private:
LONG m_cRef; // Reference count.
const COCLASS_REGISTER *m_pCoClass; // The class we belong to.
};
#endif // __ClassFactory__h__
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