68 lines
1.3 KiB
C++
68 lines
1.3 KiB
C++
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/*****************************************************************/
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/** Microsoft Windows for Workgroups **/
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/** Copyright (C) Microsoft Corp., 1991-1992 **/
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/*****************************************************************/
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/* BUFGLOB.CPP -- Implementation of GLOBAL_BUFFER class.
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*
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* History:
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* 03/22/93 gregj Created
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* 03/24/93 gregj Renamed from plain BUFFER, derived from BUFFER_BASE
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*
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*/
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#include "npcommon.h"
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#include "buffer.h"
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BOOL GLOBAL_BUFFER::Alloc( UINT cbBuffer )
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{
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_hMem = ::GlobalAlloc( GMEM_DDESHARE | GMEM_MOVEABLE, cbBuffer );
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if (_hMem == NULL) {
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_lpBuffer = NULL;
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_cb = 0;
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return FALSE;
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}
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_lpBuffer = ::GlobalLock( _hMem );
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_cb = cbBuffer;
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return TRUE;
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}
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BOOL GLOBAL_BUFFER::Realloc( UINT cbNew )
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{
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if (_hMem == NULL)
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return FALSE;
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::GlobalUnlock( _hMem );
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HGLOBAL hNew = ::GlobalReAlloc( _hMem, cbNew, GMEM_MOVEABLE );
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if (hNew == NULL) {
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::GlobalLock( _hMem );
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return FALSE;
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}
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_hMem = hNew;
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_lpBuffer = ::GlobalLock( _hMem );
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_cb = cbNew;
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return TRUE;
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}
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GLOBAL_BUFFER::GLOBAL_BUFFER( UINT cbInitial /* =0 */ )
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: BUFFER_BASE(),
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_hMem( NULL ),
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_lpBuffer( NULL )
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{
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if (cbInitial)
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Alloc( cbInitial );
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}
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GLOBAL_BUFFER::~GLOBAL_BUFFER()
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{
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if (_hMem != NULL) {
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::GlobalUnlock( _hMem );
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::GlobalFree( _hMem );
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_hMem = NULL;
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_lpBuffer = NULL;
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}
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}
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