VC++文件監控 ReadDirectoryChangesW，
1 #include <windows.h>
2 #include <tchar.h>
3 #include <stdio.h>
4
5 #include <assert.h>
6
7 char* WideCharToMultiByte(LPCTSTR widestr)
8 {
9 int num = WideCharToMultiByte(CP_OEMCP,NULL,widestr,-1,NULL,0,NULL,FALSE);
10 char *pchar = new char[num];
11 WideCharToMultiByte (CP_OEMCP,NULL,widestr,-1,pchar,num,NULL,FALSE);
12 return pchar;
13 }
14
15 bool IsDirectory(const LPTSTR & strPath)
16 {
17 DWORD dwAttrib = GetFileAttributes( strPath );
18 return static_cast<bool>( ( dwAttrib != 0xffffffff
19 && (dwAttrib & FILE_ATTRIBUTE_DIRECTORY)) );
20 }
21
22 int main()
23 {
24 HANDLE hDir;
25 BYTE* pBuffer = (LPBYTE)new CHAR[4096];
26 DWORD dwBufferSize;
27 LPTSTR lpPath = _T("D:\\同步目錄\\");
28 WCHAR szFileName[MAX_PATH];
29 char* szFilePath;
30
31 PFILE_NOTIFY_INFORMATION pNotify = (PFILE_NOTIFY_INFORMATION)pBuffer;
32
33 hDir = CreateFile( lpPath, FILE_LIST_DIRECTORY,
34 FILE_SHARE_READ |
35 FILE_SHARE_WRITE |
36 FILE_SHARE_DELETE, NULL,
37 OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS |
38 FILE_FLAG_OVERLAPPED, NULL);
39 if (hDir == INVALID_HANDLE_VALUE)
40 {
41 printf("INVALID_HANDLE_VALUE");
42 return 0;
43 }
44
45 while (TRUE)
46 {
47 if(ReadDirectoryChangesW(hDir,
48 pBuffer,
49 4096,
50 TRUE,
51 FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_LAST_WRITE,
52 &dwBufferSize,
53 NULL,
54 NULL))
55 {
56 memset(szFileName, 0, MAX_PATH);
57 memcpy(szFileName, lpPath, _tcslen(lpPath) * sizeof(WCHAR));
58 memcpy(szFileName + _tcslen(lpPath), pNotify->FileName, pNotify->FileNameLength);
59 szFilePath = WideCharToMultiByte(szFileName);
60
61 switch(pNotify->Action)
62 {
63 case FILE_ACTION_ADDED:
64 if (IsDirectory(szFileName))
65 {
66 printf("Directory %s added.\n", szFilePath);
67 }
68 else
69 {
70 printf("File %s added.\n", szFilePath);
71 }
72 break;
73 case FILE_ACTION_REMOVED:
74 if (IsDirectory(szFileName))
75 {
76 printf("Directory %s removed.\n", szFilePath);
77 }
78 else
79 {
80 printf("File %s removed.\n", szFilePath);
81 }
82 break;
83 case FILE_ACTION_MODIFIED:
84 if (!IsDirectory(szFileName))
85 {
86 printf("File %s modified.\n", szFilePath);
87 }
88 break;
89 case FILE_ACTION_RENAMED_OLD_NAME:
90 if (pNotify && pNotify->NextEntryOffset != 0UL)
91 {
92 PFILE_NOTIFY_INFORMATION pNext = (PFILE_NOTIFY_INFORMATION) ((LPBYTE)pNotify + pNotify->NextEntryOffset);
93 assert((DWORD)((BYTE*)pNext - pBuffer) < dwBufferSize);
94 {
95 WCHAR szFileName2[MAX_PATH];
96 char* szFilePath2;
97 memset(szFileName2, 0, MAX_PATH);
98 memcpy(szFileName2, lpPath, _tcslen(lpPath) * sizeof(WCHAR));
99 memcpy(szFileName2 + _tcslen(lpPath), pNext->FileName, pNext->FileNameLength);
100 szFilePath2 = WideCharToMultiByte(szFileName2);
101 if (IsDirectory(szFileName2))
102 {
103 printf("Directory name changed from %s to %s.\n", szFilePath, szFilePath2);
104 }
105 else
106 {
107 printf("File name changed from %s to %s.\n", szFilePath, szFilePath2);
108 }
109 }
110 }
111 break;
112 case FILE_ACTION_RENAMED_NEW_NAME:
113 printf("FILE_ACTION_RENAMED_NEW_NAME.\n");
114 break;
115 default:
116 break;
117 }
118 }
119 }
120 }
關於ReadDirectoryChangesW的詳細介紹可以查看
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365465(v=vs.85).aspx
