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bufglob.cpp
Package: shell.rar　[view]
Upload User: xhy777
Upload Date: 2007-02-14
Package Size: 24088k
Code Size: 1k
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Windows Kernel

Development Platform:

Visual C++

bufglob.cpp：Code Content
  1. /*****************************************************************/
  2. /**   Microsoft Windows for Workgroups **/
  3. /**       Copyright (C) Microsoft Corp., 1991-1992 **/
  4. /*****************************************************************/ 
  6. /* BUFGLOB.CPP -- Implementation of GLOBAL_BUFFER class.
  7.  *
  8.  * History:
  9.  * 03/22/93 gregj Created
  10.  * 03/24/93 gregj Renamed from plain BUFFER, derived from BUFFER_BASE
  11.  *
  12.  */
  14. #include "npcommon.h"
  15. #include "buffer.h"
  17. BOOL GLOBAL_BUFFER::Alloc( UINT cbBuffer )
  18. {
  19. _hMem = ::GlobalAlloc( GMEM_DDESHARE | GMEM_MOVEABLE, cbBuffer );
  20. if (_hMem == NULL) {
  21. _lpBuffer = NULL;
  22. _cb = 0;
  23. return FALSE;
  24. }
  26. _lpBuffer = ::GlobalLock( _hMem );
  27. _cb = cbBuffer;
  28. return TRUE;
  29. }
  31. BOOL GLOBAL_BUFFER::Realloc( UINT cbNew )
  32. {
  33. if (_hMem == NULL)
  34. return FALSE;
  36. ::GlobalUnlock( _hMem );
  38.         HGLOBAL hNew = ::GlobalReAlloc( _hMem, cbNew, GMEM_MOVEABLE );
  39. if (hNew == NULL) {
  40. ::GlobalLock( _hMem );
  41. return FALSE;
  42. }
  44. _hMem = hNew;
  45. _lpBuffer = ::GlobalLock( _hMem );
  46. _cb = cbNew;
  47. return TRUE;
  48. }
  50. GLOBAL_BUFFER::GLOBAL_BUFFER( UINT cbInitial /* =0 */ )
  51.   : BUFFER_BASE(),
  52. _hMem( NULL ),
  53. _lpBuffer( NULL )
  54. {
  55. if (cbInitial)
  56. Alloc( cbInitial );
  57. }
  59. GLOBAL_BUFFER::~GLOBAL_BUFFER()
  60. {
  61. if (_hMem != NULL) {
  62. ::GlobalUnlock( _hMem );
  63. ::GlobalFree( _hMem );
  64. _hMem = NULL;
  65. _lpBuffer = NULL;
  66. }
  67. }