155 lines
2.5 KiB
C
155 lines
2.5 KiB
C
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/*++
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// Copyright (c) 1999-2001 Microsoft Corporation, All Rights Reserved
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Module Name:
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helpers.h
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Abstract:
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Generic helper code
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History:
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--*/
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#ifndef _HELPERS_H_
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#include <genutils.h>
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inline wchar_t *Macro_CloneLPWSTR(LPCWSTR src)
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{
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if (!src)
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return 0;
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wchar_t *dest = new wchar_t[wcslen(src) + 1];
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if (!dest)
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return 0;
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return wcscpy(dest, src);
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}
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//#define Macro_CloneLPWSTR(x) \
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// (x ? wcscpy(new wchar_t[wcslen(x) + 1], x) : 0)
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template<class T>
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class CDeleteMe
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{
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protected:
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T* m_p;
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public:
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CDeleteMe(T* p) : m_p(p){}
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~CDeleteMe() {delete m_p;}
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};
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class CSysFreeMe
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{
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protected:
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BSTR m_str;
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public:
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CSysFreeMe(BSTR str) : m_str(str){}
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~CSysFreeMe() {SysFreeString(m_str);}
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};
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typedef LPVOID * PPVOID;
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template<class TObj>
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class CGenFactory : public IClassFactory
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{
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protected:
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long m_cRef;
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public:
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CGenFactory(void)
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{
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m_cRef=0L;
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return;
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};
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~CGenFactory(void)
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{
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return;
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}
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//IUnknown members
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STDMETHODIMP QueryInterface(REFIID riid, PPVOID ppv)
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{
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*ppv=NULL;
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if (IID_IUnknown==riid || IID_IClassFactory==riid)
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*ppv=this;
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if (NULL!=*ppv)
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{
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((LPUNKNOWN)*ppv)->AddRef();
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return NOERROR;
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}
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return ResultFromScode(E_NOINTERFACE);
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};
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STDMETHODIMP_(ULONG) AddRef(void)
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{
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return InterlockedIncrement(&m_cRef);
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};
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STDMETHODIMP_(ULONG) Release(void)
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{
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long lRet = InterlockedDecrement(&m_cRef);
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if (0 ==lRet)
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delete this;
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return lRet;
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};
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//IClassFactory members
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STDMETHODIMP CreateInstance(IN LPUNKNOWN pUnkOuter, IN REFIID riid, OUT PPVOID ppvObj)
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{
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HRESULT hr;
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*ppvObj=NULL;
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hr=E_OUTOFMEMORY;
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// This object doesnt support aggregation.
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if (NULL!=pUnkOuter)
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return ResultFromScode(CLASS_E_NOAGGREGATION);
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//Create the object passing function to notify on destruction.
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TObj * pObj = new TObj();
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if (NULL==pObj)
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return hr;
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// Setup the class all empty, etc.
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pObj->InitEmpty();
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hr=pObj->QueryInterface(riid, ppvObj);
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pObj->Release();
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return hr;
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};
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STDMETHODIMP LockServer(BOOL fLock)
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{
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if (fLock)
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InterlockedIncrement((long *)&g_cLock);
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else
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InterlockedDecrement((long *)&g_cLock);
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return NOERROR;
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};
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};
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class CReleaseMe
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{
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protected:
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IUnknown* m_pUnk;
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public:
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CReleaseMe(IUnknown* pUnk) : m_pUnk(pUnk){}
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~CReleaseMe() { release();}
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void release() { if(m_pUnk) m_pUnk->Release(); m_pUnk=0;}
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};
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#endif
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