117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
//
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// This file contains the implementation of SHCreateDefClassObject
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//
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#include "shellprv.h"
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#pragma hdrstop
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typedef struct
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{
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IClassFactory cf;
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UINT cRef; // Reference count
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DWORD dwFlags; // Flags to control creation...
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LPFNCREATEINSTANCE pfnCreateInstance; // CreateInstance callback entry
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UINT * pcRefDll; // Reference count of the DLL
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} CClassFactory;
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STDMETHODIMP CClassFactory_QueryInterface(IClassFactory *pcf, REFIID riid, void **ppvObj)
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{
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CClassFactory *this = IToClass(CClassFactory, cf, pcf);
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if (IsEqualIID(riid, &IID_IClassFactory) || IsEqualIID(riid, &IID_IUnknown))
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{
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InterlockedIncrement(&this->cRef);
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*ppvObj = (LPVOID) (IClassFactory *) &this->cf;
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return NOERROR;
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}
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*ppvObj = NULL;
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return E_NOINTERFACE;
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}
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STDMETHODIMP_(ULONG) CClassFactory_AddRef(IClassFactory *pcf)
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{
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CClassFactory *this = IToClass(CClassFactory, cf, pcf);
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return this->cRef;
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}
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STDMETHODIMP_(ULONG) CClassFactory_Release(IClassFactory *pcf)
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{
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CClassFactory *this = IToClass(CClassFactory, cf, pcf);
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if (--this->cRef > 0)
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return this->cRef;
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LocalFree((HLOCAL)this);
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return 0;
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}
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STDMETHODIMP CClassFactory_CreateInstance(IClassFactory *pcf, IUnknown *pUnkOuter, REFIID riid, void **ppvObject)
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{
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CClassFactory *this = IToClass(CClassFactory, cf, pcf);
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*ppvObject = NULL;
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if (pUnkOuter)
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return CLASS_E_NOAGGREGATION;
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return this->pfnCreateInstance(pUnkOuter, riid, ppvObject);
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}
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STDMETHODIMP CClassFactory_LockServer(IClassFactory *pcf, BOOL fLock)
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{
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CClassFactory *this = IToClass(CClassFactory, cf, pcf);
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if (this->pcRefDll)
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{
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if (fLock)
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this->pcRefDll++;
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else
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this->pcRefDll--;
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}
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return S_OK;
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}
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const IClassFactoryVtbl c_vtblAppUIClassFactory = {
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CClassFactory_QueryInterface, CClassFactory_AddRef, CClassFactory_Release,
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CClassFactory_CreateInstance,
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CClassFactory_LockServer
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};
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//
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// creates a simple default implementation of IClassFactory
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//
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// Parameters:
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// riid -- Specifies the interface to the class object
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// ppv -- Specifies the pointer to LPVOID where the class object pointer
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// will be returned.
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// pfnCreateInstance -- Specifies the callback entry for instanciation.
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// pcRefDll -- Specifies the address to the DLL reference count (optional)
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//
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// Notes:
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// The riidInst will be specified only if the instance of the class
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// support only one interface.
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//
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// we would like to get rid of this
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// this API called by MMSYS.CPL, RNAUI.DLL, SYNCUI.DLL
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STDAPI SHCreateDefClassObject(REFIID riid, void **ppv, LPFNCREATEINSTANCE pfnCreateInstance, UINT *pcRefDll, REFIID riidInst)
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{
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*ppv = NULL;
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if (IsEqualIID(riid, &IID_IClassFactory))
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{
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CClassFactory *pacf = (CClassFactory *)LocalAlloc(LPTR, SIZEOF(CClassFactory));
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if (pacf)
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{
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pacf->cf.lpVtbl = &c_vtblAppUIClassFactory;
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pacf->cRef++; // pacf->cRef=0; (generates smaller code)
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pacf->pcRefDll = pcRefDll;
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pacf->pfnCreateInstance = pfnCreateInstance;
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(IClassFactory *)*ppv = &pacf->cf;
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return NOERROR;
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}
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return E_OUTOFMEMORY;
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}
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return E_NOINTERFACE;
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}
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