Source code of Windows XP (NT5)
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#ifndef __IPSTG_H__
#define __IPSTG_H__
//
// CImpIPersistStorage works very well along-side an IPersistStreamInit
// implementation.
//
// IE30's CShellEmbedding implemented this interface because it was
// an embedding must-have. But none of our objects were marked as
// embeddable, so we really didn't need it.
//
// I pulled the implementation to a new class that can easily be
// included into any object that needs an IPersistStorange implementation
// that delegates to the object's IPersistStreamInit implementation.
//
class CImpIPersistStorage : public IPersistStorage
{
public:
// *** IUnknown ***
virtual STDMETHODIMP QueryInterface(REFIID riid, LPVOID * ppvObj) PURE;
virtual STDMETHODIMP_(ULONG) AddRef(void) PURE;
virtual STDMETHODIMP_(ULONG) Release(void) PURE;
// *** IPersist ***
virtual STDMETHODIMP GetClassID(CLSID *pClassID) PURE;
// *** IPersistStorage ***
virtual STDMETHODIMP IsDirty(void) PURE; // matches IPersistStreamInit
virtual STDMETHODIMP InitNew(IStorage *pStg);
virtual STDMETHODIMP Load(IStorage *pStg);
virtual STDMETHODIMP Save(IStorage *pStgSave, BOOL fSameAsLoad);
virtual STDMETHODIMP SaveCompleted(IStorage *pStgNew);
virtual STDMETHODIMP HandsOffStorage(void);
// These happen to match IPersistStreamInit methods.
// They should update the dirty state of the object as
// returned from IsDirty().
//
virtual STDMETHODIMP Load(IStream *pStm) PURE;
virtual STDMETHODIMP Save(IStream *pStm, BOOL fClearDirty) PURE;
virtual STDMETHODIMP InitNew(void) PURE;
};
#endif // __IPSTG_H__