172 lines
5.0 KiB
C
172 lines
5.0 KiB
C
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/*
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* A basic implementation for COM DLL implementor.
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*
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* Copyright (C) 2002 Hidenori TAKESHIMA <hidenori@a2.ctktv.ne.jp>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef WINE_COMIMPL_H
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#define WINE_COMIMPL_H
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/*
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This code provides a basic thread-safe COM implementation
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including aggregation(and an IClassFactory implementation).
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This code is based on my quartz code.
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The usage of this library is:
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1) copy comimpl.h and comimpl.c.
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2) implement the global class entries 'COMIMPL_ClassList'.
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3) export COMIMPL_DllMain, COMIMPL_DllGetClassObject and
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COMIMPL_DllCanUnloadNow.
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4) add 'comimpl' to your debug channels.
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5) implement your IUnknown as a thunk to call
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COMIMPL_IUnkImpl.punk methods.
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6) provide pointers of vtables in constructor.
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7) optionally, you can edit comimpl.h and/or comimpl.c.
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A sample allocator of class COne that supports
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two interface IOne and ITwo is:
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const COMIMPL_CLASSENTRY COMIMPL_ClassList[] =
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{
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{ &CLSID_COne, &COne_AllocObj },
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{ NULL, NULL } << the last entry must be NULL >>
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};
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typedef struct COne
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{
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COMIMPL_IUnkImpl vfunk; << must be the first member of this struct >>
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struct { ICOM_VFIELD(IOne); } vfone;
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struct { ICOM_VFIELD(ITwo); } vftwo;
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<< ... >>
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} COne;
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#define COne_THIS(iface,member) COne* This = ((COne*)(((char*)iface)-offsetof(COne,member)))
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static COMIMPL_IFEntry IFEntries[] =
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{
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<< all supported interfaces >>
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{ &IID_IOne, offsetof(COne,vfone)-offsetof(COne,vfunk) },
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{ &IID_ITwo, offsetof(COne,vftwo)-offsetof(COne,vfunk) },
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};
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static void COne_Destructor(IUnknown* iface)
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{
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COne_THIS(iface,vfunk);
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<< ... implement destructor ... >>
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}
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HRESULT COne_AllocObj(IUnknown* punkOuter,void** ppobj)
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{
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COne* This;
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This = (COne*)COMIMPL_AllocObj( sizeof(COne) );
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if ( This == NULL ) return E_OUTOFMEMORY;
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COMIMPL_IUnkInit( &This->vfunk, punkOuter );
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This->vfunk.pEntries = IFEntries;
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This->vfunk.dwEntries = sizeof(IFEntries)/sizeof(IFEntries[0]);
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This->vfunk.pOnFinalRelease = COne_Destructor;
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ICOM_VTBL(&This->vfone) = &ione;
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ICOM_VTBL(&This->vftwo) = &itwo;
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<< ... implement constructor ... >>
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<< if error occurs in constructing, you can call simply
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punk::Release() and return HRESULT. >>
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*ppobj = (void*)(&This->vfunk);
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return S_OK; << return S_OK if succeeded >>
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}
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*/
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/* if per-thread initialization is needed, uncomment the following line */
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/*#define COMIMPL_PERTHREAD_INIT*/
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/* If an own heap is needed, customize the following line */
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#define COMIMPL_hHeap GetProcessHeap()
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typedef HRESULT (*COMIMPL_pCreateIUnknown)(IUnknown* punkOuter,void** ppobj);
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typedef void (*COMIMPL_pOnFinalRelease)(IUnknown* punkInner);
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typedef struct COMIMPL_IFEntry COMIMPL_IFEntry;
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typedef struct COMIMPL_IFDelegation COMIMPL_IFDelegation;
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typedef struct COMIMPL_IUnkImpl COMIMPL_IUnkImpl;
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struct COMIMPL_IFEntry
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{
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const IID* piid; /* interface ID. */
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size_t ofsVTPtr; /* offset from IUnknown. */
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};
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struct COMIMPL_IFDelegation
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{
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struct COMIMPL_IFDelegation* pNext;
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HRESULT (*pOnQueryInterface)(
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IUnknown* punk, const IID* piid, void** ppobj );
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};
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/* COMIMPL_IUnkimpl must be aligned for InterlockedExchangeAdd. */
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#include <pshpack4.h>
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struct COMIMPL_IUnkImpl
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{
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/* pointer of IUnknown interface. */
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ICOM_VFIELD(IUnknown);
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/* array of supported IIDs and offsets. */
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const COMIMPL_IFEntry* pEntries;
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DWORD dwEntries;
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/* list of delegation handlers. */
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COMIMPL_IFDelegation* pDelegationFirst;
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/* called on final release. */
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COMIMPL_pOnFinalRelease pOnFinalRelease;
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/* IUnknown fields. */
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LONG ref;
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IUnknown* punkControl;
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};
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#include <poppack.h>
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typedef struct COMIMPL_CLASSENTRY
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{
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const CLSID* pclsid;
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COMIMPL_pCreateIUnknown pCreateIUnk;
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} COMIMPL_CLASSENTRY;
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extern const COMIMPL_CLASSENTRY COMIMPL_ClassList[]; /* must be provided */
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void COMIMPL_IUnkInit( COMIMPL_IUnkImpl* pImpl, IUnknown* punkOuter );
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void COMIMPL_IUnkAddDelegationHandler(
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COMIMPL_IUnkImpl* pImpl, COMIMPL_IFDelegation* pDelegation );
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BOOL WINAPI COMIMPL_DllMain(
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HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpvReserved );
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HRESULT WINAPI COMIMPL_DllGetClassObject(
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const CLSID* pclsid,const IID* piid,void** ppv);
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HRESULT WINAPI COMIMPL_DllCanUnloadNow(void);
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void* COMIMPL_AllocObj( DWORD dwSize );
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void COMIMPL_FreeObj( void* pobj ); /* for internal use only. */
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#endif /* WINE_COMIMPL_H */
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