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//+---------------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) Microsoft Corporation, 1992 - 1994.
//
// File: memstm.h
//
// Contents: memstm.h from OLE2
//
// History: 11-Apr-94 DrewB Copied from OLE2
//
//----------------------------------------------------------------------------
#if !defined( _MEMSTM_H_ )
#define _MEMSTM_H_
// These defines shorten the class name so that the compiler doesn't
// choke on really long decorated names for MarshalInterface
#define CMarshalMemStm CMMS
#define CMarshalMemBytes CMMB
class FAR CMarshalMemStm;class FAR CMarshalMemBytes;
// CMemStm is a stream implementation on top of global shared memory MEMSTM
//
// CMemStm
// +---------+
// + pvtf + Shared memory
// +---------+ +--------------+
// + m_pMem +-->|cb |
// +---------+ |cRef |
// |hGlobal |--->+--------------+
// +--------------+ | Actual Data |
// CMemStm MEMSTM +--------------+
//
struct MEMSTM { // Data in shared memory
DWORD cb; // Size of hGlobal
DWORD cRef; // See below
HANDLE hGlobal; // The data
BOOL fDeleteOnRelease;};
// cRef counts all CMemStm pointers to this MEMSTM plus the number of times
// a hMem handle to MEMSTM had been returned
//
#define STREAM_SIG (0x4d525453L)
class FAR CMemStm : public IStream { // Shared emmory stream
public: OLEMETHOD(QueryInterface) (REFIID iidInterface, void FAR* FAR* ppvObj); OLEMETHOD_(ULONG,AddRef) (void); OLEMETHOD_(ULONG,Release) (void); OLEMETHOD(Read) (VOID HUGEP* pv, ULONG cb, ULONG FAR* pcbRead); OLEMETHOD(Write) (VOID const HUGEP* pv, ULONG cb, ULONG FAR* pcbWritten); OLEMETHOD(Seek) (LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER FAR* plibNewPosition); OLEMETHOD(SetSize) (ULARGE_INTEGER cb); OLEMETHOD(CopyTo) (IStream FAR* pstm, ULARGE_INTEGER cb, ULARGE_INTEGER FAR* pcbRead, ULARGE_INTEGER FAR* pcbWritten); OLEMETHOD(Commit) (DWORD grfCommitFlags); OLEMETHOD(Revert) (void); OLEMETHOD(LockRegion) (ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType); OLEMETHOD(UnlockRegion) (ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType); OLEMETHOD(Stat) (STATSTG FAR* pstatstg, DWORD statflag); OLEMETHOD(Clone)(IStream FAR * FAR *ppstm);
OLESTATIC_(CMemStm FAR*) Create(HANDLE hMem);
ctor_dtor: CMemStm() { GET_A5(); m_hMem = NULL; m_pData = NULL; m_pos = 0; m_refs = 0; } ~CMemStm() {}
private: DWORD m_dwSig; // Signature indicating this is our
// implementation of IStream: STREAM_SIG
ULONG m_refs; // Number of references to this CmemStm
ULONG m_pos; // Seek pointer for Read/Write
HANDLE m_hMem; // Memory Handle passed on creation
MEMSTM FAR* m_pData; // Pointer to that memroy
friend HRESULT STDAPICALLTYPE GetHGlobalFromStream (LPSTREAM, HGLOBAL FAR*); friend LPSTREAM STDAPICALLTYPE CreateMemStm (DWORD, LPHANDLE); friend class CMarshalMemStm; SET_A5;};
// CMemBytes is an ILockBytes implementation on top of global shared
// memory MEMSTM
//
// CMemBytes
// +---------+
// + pvtf + Shared memory
// +---------+ +--------------+
// + m_pData +-->| cb |
// +---------+ | cRef |
// | hGlobal |--->+-------------+
// +--------------+ | Actual data |
// CMemBytes MEMSTM +-------------+
//
#define LOCKBYTE_SIG (0x0046574A)
// cRef counts all CMemBytes pointers to this MEMSTM.
// It and fDeleteOnRelease control the GlobalFree'ing of the hGlobal.
class FAR CMemBytes : public ILockBytes { // Shared memory lock bytes
public: OLEMETHOD(QueryInterface) (REFIID iidInterface, void FAR* FAR* ppvObj); OLEMETHOD_(ULONG,AddRef) (void); OLEMETHOD_(ULONG,Release) (void); OLEMETHOD(ReadAt) (ULARGE_INTEGER ulOffset, VOID HUGEP *pv, ULONG cb, ULONG FAR *pcbRead); OLEMETHOD(WriteAt) (ULARGE_INTEGER ulOffset, VOID const HUGEP *pv, ULONG cb, ULONG FAR *pcbWritten); OLEMETHOD(Flush) (void); OLEMETHOD(SetSize) (ULARGE_INTEGER cb); OLEMETHOD(LockRegion) (ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType); OLEMETHOD(UnlockRegion) (ULARGE_INTEGER libOffset, ULARGE_INTEGER cb, DWORD dwLockType); OLEMETHOD(Stat) (THIS_ STATSTG FAR *pstatstg, DWORD statflag);
OLESTATIC_(CMemBytes FAR*) Create(HANDLE hMem);
ctor_dtor: CMemBytes() { GET_A5(); m_hMem = NULL; m_pData = NULL; m_refs = 0; } ~CMemBytes() {}
private: DWORD m_dwSig; // Signature indicating this is our
// implementation of ILockBytes: LOCKBYTE_SIG
ULONG m_refs; // Normal reference count
HANDLE m_hMem; // Handle for bookeeping info (MEMSTM)
MEMSTM FAR* m_pData; // Pointer to that memroy
friend HRESULT STDAPICALLTYPE GetHGlobalFromILockBytes (LPLOCKBYTES, HGLOBAL FAR*); friend class CMarshalMemBytes; SET_A5;};
// CMarshalMemStm can Marshal, Unmarshal CMemStm. It is impletented as
// a seperate object accessible from CMemStm, CMemBytes: QueryIntreface of
// IMarshal on CMemStm's IStream will return an IMarshal pointer to
// CMarshalMemStm, but QueryInterface of IStream on that IMarshal will
// fail.
// Also QueryInterface of IUnknown on IMarshal will not return the same value
// As QueryInterface of IUnkown on the original IStream.
//
class FAR CMarshalMemStm : public IMarshal {public: OLEMETHOD(QueryInterface) (REFIID riid, LPVOID FAR* ppvObj); OLEMETHOD_(ULONG,AddRef) (void); OLEMETHOD_(ULONG,Release) (void);
OLEMETHOD(GetUnmarshalClass)(THIS_ REFIID riid, LPVOID pv, DWORD dwDestContext, LPVOID pvDestContext, DWORD mshlflags, LPCLSID pCid); OLEMETHOD(GetMarshalSizeMax)(THIS_ REFIID riid, LPVOID pv, DWORD dwDestContext, LPVOID pvDestContext, DWORD mshlflags, LPDWORD pSize); OLEMETHOD(MarshalInterface)(THIS_ IStream FAR* pStm, REFIID riid, LPVOID pv, DWORD dwDestContext, LPVOID pvDestContext, DWORD mshlflags); OLEMETHOD(UnmarshalInterface)(THIS_ IStream FAR* pStm, REFIID riid, LPVOID FAR* ppv); OLEMETHOD(ReleaseMarshalData)(THIS_ IStream FAR* pStm); OLEMETHOD(DisconnectObject)(THIS_ DWORD dwReserved);
OLESTATIC_(CMarshalMemStm FAR*) Create(CMemStm FAR* pMemStm);
ctor_dtor: CMarshalMemStm() { GET_A5();m_pMemStm = NULL; m_refs = 0; } ~CMarshalMemStm() {}
private: ULONG m_refs; // Number of references to this CmemStm
CMemStm FAR* m_pMemStm; // Pointer to object [Un]Marshalled
CLSID m_clsid; // Class of object pointed by pUnk
SET_A5;};
// CMarshalMemBytes can Marshal, Unmarshal CMemBytes. It is impletented as
// a seperate object accessible from CMemBytes, CMemBytes: QueryIntreface of
// IMarshal on CMemBytes's ILocBytes will return an IMarshal pointer to
// CMarshalMemBytes, but QueryInterface of ILockBytes on that IMarshal will
// fail.
// Also QueryInterface of IUnknown on IMarshal will not return the same value
// As QueryInterface of IUnkown on the original ILockBytes.
//
class FAR CMarshalMemBytes : public IMarshal {public: OLEMETHOD(QueryInterface) (REFIID riid, LPVOID FAR* ppvObj); OLEMETHOD_(ULONG,AddRef) (void); OLEMETHOD_(ULONG,Release) (void);
OLEMETHOD(GetUnmarshalClass)(THIS_ REFIID riid, LPVOID pv, DWORD dwDestContext, LPVOID pvDestContext, DWORD mshlflags, LPCLSID pCid); OLEMETHOD(GetMarshalSizeMax)(THIS_ REFIID riid, LPVOID pv, DWORD dwDestContext, LPVOID pvDestContext, DWORD mshlflags, LPDWORD pSize); OLEMETHOD(MarshalInterface)(THIS_ IStream FAR* pStm, REFIID riid, LPVOID pv, DWORD dwDestContext, LPVOID pvDestContext, DWORD mshlflags); OLEMETHOD(UnmarshalInterface)(THIS_ IStream FAR* pStm, REFIID riid, LPVOID FAR* ppv); OLEMETHOD(ReleaseMarshalData)(THIS_ IStream FAR* pStm); OLEMETHOD(DisconnectObject)(THIS_ DWORD dwReserved);
OLESTATIC_(CMarshalMemBytes FAR*) Create(CMemBytes FAR* pMemBytes);
ctor_dtor: CMarshalMemBytes() { GET_A5();m_pMemBytes = NULL; m_refs = 0; } ~CMarshalMemBytes() {}
private: ULONG m_refs; // Number of references to this CMemBytes
CMemBytes FAR* m_pMemBytes; // Pointer to object [Un]Marshalled
CLSID m_clsid; // Class of object pointed by pUnk
SET_A5;};
#endif // _MemBytes_H
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