107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
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#pragma once
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///////////////////////////////////////////////////////////////////////////////
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// Memory stream implementations for DS OLE DB PROVIDER
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//
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// copied from cdopt\src\cdo\mystream.* and modified.
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class ATL_NO_VTABLE CStreamMem :
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INHERIT_TRACKING,
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public CComObjectRootEx<CComMultiThreadModel>,
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public IStream,
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public IGetSourceRow
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{
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public:
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DECLARE_GET_CONTROLLING_UNKNOWN()
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BEGIN_COM_MAP(CStreamMem)
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COM_INTERFACE_ENTRY(IStream)
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COM_INTERFACE_ENTRY(ISequentialStream)
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COM_INTERFACE_ENTRY(IGetSourceRow)
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COM_INTERFACE_ENTRY_AGGREGATE(IID_IMarshal, m_pUnkMarshaler.p)
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END_COM_MAP()
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HRESULT FinalConstruct()
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{
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RRETURN( CoCreateFreeThreadedMarshaler(
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GetControllingUnknown(), &m_pUnkMarshaler.p));
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}
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void FinalRelease()
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{
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m_pUnkMarshaler.Release();
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}
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CComPtr<IUnknown> m_pUnkMarshaler;
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private:
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auto_cs m_cs; // critical section
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ULONG m_cbSeek;
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STATSTG m_statstg;
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CComVariant m_pVar;
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auto_rel<IRow> m_pSourceRow;
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HROW m_hRow;
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PVOID m_pvData;
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DWORD m_cbBufferSize;
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bool m_fExternalData;
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public:
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CStreamMem(void);
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~CStreamMem(void);
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//internal methods
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HRESULT Initialize(VARIANT *pVar, IRow* pSourceRow, HROW hRow);
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// IStream
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STDMETHODIMP Read(
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void __RPC_FAR *pv,
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ULONG cb,
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ULONG __RPC_FAR *pcbRead);
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STDMETHODIMP Write(
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const void __RPC_FAR *pv,
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ULONG cb,
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ULONG __RPC_FAR *pcbWritten);
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STDMETHODIMP Seek(
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LARGE_INTEGER dlibMove,
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DWORD dwOrigin,
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ULARGE_INTEGER __RPC_FAR *plibNewPosition);
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STDMETHODIMP SetSize(
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ULARGE_INTEGER libNewSize);
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STDMETHODIMP CopyTo(
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IStream __RPC_FAR *pstm,
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ULARGE_INTEGER cb,
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ULARGE_INTEGER __RPC_FAR *pcbRead,
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ULARGE_INTEGER __RPC_FAR *pcbWritten);
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STDMETHODIMP Commit(
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DWORD grfCommitFlags);
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STDMETHODIMP Revert( void);
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STDMETHODIMP LockRegion(
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ULARGE_INTEGER libOffset,
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ULARGE_INTEGER cb,
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DWORD dwLockType);
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STDMETHODIMP UnlockRegion(
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ULARGE_INTEGER libOffset,
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ULARGE_INTEGER cb,
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DWORD dwLockType);
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STDMETHODIMP Stat(
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STATSTG __RPC_FAR *pstatstg,
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DWORD grfStatFlag);
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STDMETHODIMP Clone(
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IStream __RPC_FAR *__RPC_FAR *ppstm);
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//IGetSourceRow
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STDMETHODIMP GetSourceRow(REFIID riid, IUnknown **ppRow);
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};
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