delphi备份恢复剪切板（使用了GlobalLock API函数和CopyMemory）

看了季世平老兄的C++代码后翻译过来的

1. unit clipbak;
2. interface
3. uses
4. SysUtils, Classes, Clipbrd, Windows, Contnrs;
5. type
6. TClipData = class
7. Format: WORD;
8. Data: THANDLE;
9. end;
10. TClipBackuper = class
11. private
12. ClipList: TList;
13. public
14. constructor Create;
15. destructor Destroy; override;
16. procedure BackupClip();
17. procedure RestoreClip();
18. end;
19. implementation
20. constructor TClipBackuper.Create;
21. begin
22. Cliplist := TObjectList.Create;
23. end;
24. destructor TClipBackuper.Destroy;
25. begin
26. ClipList.Free;
27. end;
28. procedure TClipBackuper.BackupClip;
29. var
30. i: Integer;
31. Data: THANDLE;
32. pcd: TClipData;
33. DataMem: Pointer;
34. begin
35. ClipList.Clear();
36. Clipboard.Open();
37. try
38. for i := 0 to Clipboard().FormatCount - 1 do
39. begin
40. pcd := TClipData.Create;
41. pcd.Format := Clipboard().Formats[i];
42. Data := THANDLE(Clipboard().GetAsHandle( pcd.Format));
43. if (Data = 0) then
44. begin
45. pcd.free;
46. continue;
47. end;
48. pcd.Data := GlobalAlloc(GMEM_MOVEABLE or GMEM_DDESHARE, GlobalSize(Data));
49. DataMem := GlobalLock(pcd.Data);
50. if (DataMem <> nil) then
51. begin
52. CopyMemory(DataMem, GlobalLock(Data), GlobalSize(Data));
53. GlobalUnlock(THANDLE(pcd.Data));
54. GlobalUnlock(THANDLE(Data));
55. end;
56. ClipList.Add(pcd);
57. end;
58. finally
59. Clipboard().Close();
60. end;
61. end;
62. procedure TClipBackuper.RestoreClip;
63. var
64. pcd: TClipData;
65. i: Integer;
66. begin
67. Clipboard.Open();
68. try
69. Clipboard.Clear();
70. for i := 0 to ClipList.Count - 1 do
71. begin
72. pcd := TClipData(ClipList[i]);
73. SetClipboardData(pcd.Format, pcd.Data);
74. end;
75. ClipList.Clear();
76. finally
77. Clipboard().Close();
78. end;
79. end;
80. end.

http://blog.csdn.net/youthon/article/details/7327776