VC++文件监控 ReadDirectoryChangesW

 #include <windows.h>
 #include <tchar.h>
 #include <stdio.h>
 
 #include <assert.h>
 
 char* WideCharToMultiByte(LPCTSTR widestr)
 {
     int num = WideCharToMultiByte(CP_OEMCP,NULL,widestr,-,NULL,,NULL,FALSE);
     char *pchar = new char[num];
     WideCharToMultiByte (CP_OEMCP,NULL,widestr,-,pchar,num,NULL,FALSE);
     return pchar;
 }
 
 bool IsDirectory(const LPTSTR & strPath)
 {
     DWORD dwAttrib    = GetFileAttributes( strPath );
     return static_cast<bool>( ( dwAttrib != 0xffffffff
         &&    (dwAttrib & FILE_ATTRIBUTE_DIRECTORY)) );
 }
 
 int main()
 {
     HANDLE hDir;
     BYTE*  pBuffer = (LPBYTE)new CHAR[];
     DWORD  dwBufferSize;
     LPTSTR lpPath = _T("D:\\同步目录\\");
     WCHAR  szFileName[MAX_PATH];
     char*  szFilePath;
 
     PFILE_NOTIFY_INFORMATION pNotify = (PFILE_NOTIFY_INFORMATION)pBuffer;
 
     hDir = CreateFile( lpPath, FILE_LIST_DIRECTORY,
         FILE_SHARE_READ |
         FILE_SHARE_WRITE |
         FILE_SHARE_DELETE, NULL,
         OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS |
         FILE_FLAG_OVERLAPPED, NULL);
     if (hDir == INVALID_HANDLE_VALUE)
     {
         printf("INVALID_HANDLE_VALUE");
         return ;
     }
 
     while (TRUE)
     {
         if(ReadDirectoryChangesW(hDir,
             pBuffer,
             ,
             TRUE,
             FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_LAST_WRITE,
             &dwBufferSize,
             NULL,
             NULL))
         {
             memset(szFileName, , MAX_PATH);
             memcpy(szFileName, lpPath, _tcslen(lpPath) * sizeof(WCHAR));
             memcpy(szFileName + _tcslen(lpPath), pNotify->FileName, pNotify->FileNameLength);
             szFilePath = WideCharToMultiByte(szFileName);
 
             switch(pNotify->Action)
             {
             case FILE_ACTION_ADDED:
                 if (IsDirectory(szFileName))
                 {
                     printf("Directory %s added.\n", szFilePath);
                 }
                 else
                 {
                     printf("File %s added.\n", szFilePath);
                 }
                 break;
             case FILE_ACTION_REMOVED:
                 if (IsDirectory(szFileName))
                 {
                     printf("Directory %s removed.\n", szFilePath);
                 }
                 else
                 {
                     printf("File %s removed.\n", szFilePath);
                 }
                 break;
             case FILE_ACTION_MODIFIED:
                 if (!IsDirectory(szFileName))
                 {
                     printf("File %s modified.\n", szFilePath);
                 }
                 break;
             case FILE_ACTION_RENAMED_OLD_NAME:
                 if (pNotify && pNotify->NextEntryOffset != 0UL)
                 {
                     PFILE_NOTIFY_INFORMATION pNext = (PFILE_NOTIFY_INFORMATION) ((LPBYTE)pNotify + pNotify->NextEntryOffset);
                     assert((DWORD)((BYTE*)pNext - pBuffer) < dwBufferSize);
                     {
                         WCHAR  szFileName2[MAX_PATH];
                         char*  szFilePath2;
                         memset(szFileName2, , MAX_PATH);
                         memcpy(szFileName2, lpPath, _tcslen(lpPath) * sizeof(WCHAR));
                         memcpy(szFileName2 + _tcslen(lpPath), pNext->FileName, pNext->FileNameLength);
                         szFilePath2 = WideCharToMultiByte(szFileName2);
                         if (IsDirectory(szFileName2))
                         {
                             printf("Directory name changed from %s to %s.\n", szFilePath, szFilePath2);
                         }
                         else
                         {
                             printf("File name changed from %s to %s.\n", szFilePath, szFilePath2);
                         }
                     }
                 }
                 break;
             case FILE_ACTION_RENAMED_NEW_NAME:
                 printf("FILE_ACTION_RENAMED_NEW_NAME.\n");
                 break;
             default:
                 break;
             }
         }
     }
 }

关于ReadDirectoryChangesW的详细介绍可以查看
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365465(v=vs.85).aspx