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96 lines
2.1 KiB
96 lines
2.1 KiB
#ifndef _COWSITE_H_
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#define _COWSITE_H_
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class CObjectWithSite : public IObjectWithSite
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{
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public:
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CObjectWithSite() {_punkSite = NULL;};
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virtual ~CObjectWithSite() {ATOMICRELEASE(_punkSite);}
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//*** IUnknown ****
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// (client must provide!)
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//*** IObjectWithSite ***
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STDMETHOD(SetSite)(IUnknown *punkSite);
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STDMETHOD(GetSite)(REFIID riid, void **ppvSite);
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protected:
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IUnknown* _punkSite;
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};
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//
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// use this when you dont have a good Destroy site chain event - ZekeL - 20-DEC-2000
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// if you need to call SetSite(NULL) on your children, and
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// would prefer to do this cleanup in your destructor.
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// your object should be implemented like this
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//
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/******
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class CMyObject : public IMyInterface
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{
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private:
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CSafeServiceSite *_psss;
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IKid _pkid;
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CMyObject()
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{
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_psss = new CSafeServiceSite();
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if (_psss)
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_psss->SetProviderWeakRef(this);
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}
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~CMyObject()
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{
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if (_psss)
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{
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_psss->SetProviderWeakRef(NULL);
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_psss->Release();
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}
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if (_pkid)
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{
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IUnknown_SetSite(_pkid, _psss);
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_pkid->Release();
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}
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}
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public:
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// IMyInterface
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HRESULT Init()
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{
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CoCreate(CLSID_Kid, &_pkid);
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IUnknown_SetSite(_pkid, _psss);
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}
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// NOTE - there is no Uninit()
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// so it's hard to know when to release _pkid
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// and you dont want to _pkid->SetSite(NULL)
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// unless you are sure you are done
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};
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******/
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class CSafeServiceSite : public IServiceProvider
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{
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public:
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CSafeServiceSite() : _cRef(1), _psp(NULL) {}
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// IUnknown
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STDMETHODIMP QueryInterface(REFIID riid, void **ppv);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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// IServiceProvider
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STDMETHODIMP QueryService(REFGUID guidService, REFIID riid, void **ppvObj);
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// our personal weak ref
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HRESULT SetProviderWeakRef(IServiceProvider *psp);
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private: // methods
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~CSafeServiceSite()
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{ ASSERT(_psp == NULL); }
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private: // members
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LONG _cRef;
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IServiceProvider *_psp;
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};
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#endif
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