132 lines
3.4 KiB
C++
132 lines
3.4 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1995.
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//
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// File: QueryUnk.cxx
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//
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// Contents: Controlling IUnknown interface for IQuery/IRowset
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//
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// History: 18 Jul 1995 AlanW Created
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//
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//--------------------------------------------------------------------------
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#include <pch.cxx>
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#pragma hdrstop
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#include <rowset.hxx>
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#include "queryunk.hxx"
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//+-------------------------------------------------------------------------
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//
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// Member: CQueryUnknown::QueryInterface, public
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//
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// Arguments: [ifid] -- Interface id
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// [ppiuk] -- Interface return pointer
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//
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// Returns: Error. No rebind from this class is supported.
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//
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// History: 18 Jul 1995 AlanW Created
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//
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//--------------------------------------------------------------------------
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STDMETHODIMP CQueryUnknown::QueryInterface( REFIID ifid, void ** ppiuk )
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{
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*ppiuk = 0;
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return E_NOINTERFACE;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CQueryUnknown::AddRef, public
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//
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// Synopsis: Reference the virtual table.
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//
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// History: 18 Jul 1995 AlanW Created
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//
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//--------------------------------------------------------------------------
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STDMETHODIMP_(ULONG) CQueryUnknown::AddRef(void)
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{
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return InterlockedIncrement( (long *)&_ref );
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CQueryUnknown::Release, public
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//
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// Synopsis: De-Reference the virtual table.
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//
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// Effects: If the ref count goes to 0 then the table is deleted.
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//
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// History: 18 Jul 1995 AlanW Created
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//
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//--------------------------------------------------------------------------
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STDMETHODIMP_(ULONG) CQueryUnknown::Release(void)
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{
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long l = InterlockedDecrement( (long *)&_ref );
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if ( l <= 0 )
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{
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// delete the rowsets allocated (if any)
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ReInit();
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_rUnk.Release(); // final reference, drop the owner's refcount
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return 0;
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}
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return l;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CQueryUnknown::ReInit, public
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//
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// Synopsis: Prepares for execution of a new query
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//
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// Arguments: [cRowsets] -- # of rowsets in ppRowsets
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// [ppRowsets] -- Array of CRowset pointers
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//
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// History: 18 Jul 1995 AlanW Created
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//
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//--------------------------------------------------------------------------
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void CQueryUnknown::ReInit( ULONG cRowsets,
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CRowset ** ppRowsets )
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{
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for (unsigned i = 0; i < _cRowsets; i++)
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delete _apRowsets[i];
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delete [] _apRowsets;
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Win4Assert(_ref == 0 || _ref == cRowsets);
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if (cRowsets == 0)
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_ref = 0;
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_cRowsets = cRowsets;
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_apRowsets = ppRowsets;
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if (cRowsets > 0)
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_rUnk.AddRef();
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CQueryUnknown::~CQueryUnknown, private
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//
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// Synopsis: Clean up
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//
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// History: 18-Jun-93 KyleP Created
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//
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//--------------------------------------------------------------------------
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CQueryUnknown::~CQueryUnknown()
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{
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ReInit();
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}
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