121 lines
2.5 KiB
C++
121 lines
2.5 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1994.
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//
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// File: lockbyte.cxx
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//
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// Contents: lockbyte.cpp from OLE2
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//
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// History: 11-Apr-94 DrewB Copied from OLE2
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//
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//----------------------------------------------------------------------------
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#include "headers.cxx"
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#pragma hdrstop
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#include <ole2int.h>
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#include "memstm.h"
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#include <reterr.h>
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// CreateILockBytesOnHGlobal
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//
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OLEAPI CreateILockBytesOnHGlobal
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(HGLOBAL hGlobal,
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BOOL fDeleteOnRelease,
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LPLOCKBYTES FAR* pplkbyt)
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{
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HANDLE hMem = NULL; // point to
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struct MEMSTM FAR* pData = NULL; // a struct MEMSTM
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ILockBytes FAR* pBytes = NULL;
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DWORD cbSize = -1L;
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VDATEPTRIN (pplkbyt, LPLOCKBYTES);
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*pplkbyt = NULL;
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if (NULL==hGlobal)
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{
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hGlobal = GlobalAlloc(GMEM_DDESHARE | GMEM_MOVEABLE, 0);
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if (hGlobal == NULL)
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goto ErrorExit;
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cbSize = 0;
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// REVIEW: need to free this block if error below
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}
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else
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{
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cbSize = GlobalSize (hGlobal);
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// Is there a way to verify a zero-sized handle?
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if (cbSize!=0)
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{
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// verify validity of passed-in handle
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if (NULL==GlobalLock(hGlobal))
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{
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// bad handle
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return ResultFromScode (E_INVALIDARG);
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}
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GlobalUnlock (hGlobal);
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}
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}
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hMem = GlobalAlloc (GMEM_DDESHARE | GMEM_MOVEABLE, sizeof (MEMSTM));
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if (hMem == NULL)
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goto ErrorExit;
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pData = (MEMSTM FAR*)MAKELONG(0, HIWORD(GlobalHandle(hMem)));
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if (pData == NULL)
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goto FreeMem;
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pData->cRef = 0;
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pData->cb = cbSize;
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pData->fDeleteOnRelease = fDeleteOnRelease;
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pData->hGlobal = hGlobal;
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pBytes = CMemBytes::Create(hMem); // Create the ILockBytes
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if (pBytes == NULL)
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goto FreeMem;
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*pplkbyt = pBytes;
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return NOERROR;
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FreeMem:
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if (hMem)
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GlobalFree(hMem);
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ErrorExit:
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Assert (0);
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return ReportResult(0, E_OUTOFMEMORY, 0, 0);
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}
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OLEAPI GetHGlobalFromILockBytes
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(LPLOCKBYTES plkbyt,
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HGLOBAL FAR* phglobal)
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{
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VDATEIFACE (plkbyt);
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VDATEPTRIN (phglobal, HANDLE);
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*phglobal = NULL;
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CMemBytes FAR* pCMemByte = (CMemBytes FAR*)plkbyt;
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if (IsBadReadPtr (&(pCMemByte->m_dwSig), sizeof(ULONG))
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|| pCMemByte->m_dwSig != LOCKBYTE_SIG)
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{
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// we were passed someone else's implementation of ILockBytes
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return ResultFromScode (E_INVALIDARG);
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}
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MEMSTM FAR* pMem= pCMemByte->m_pData;
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if (NULL==pMem)
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{
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Assert (0);
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return ResultFromScode (E_OUTOFMEMORY);
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}
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Assert (pMem->cb <= GlobalSize (pMem->hGlobal));
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Verify (*phglobal = pMem->hGlobal);
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return NOERROR;
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}
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