C/C++实现监控目录文件变化

BOOL ReadDirectoryChangesW(
  HANDLE                hDirectory,
  LPVOID                lpBuffer,
  DWORD                 nBufferLength,
  BOOL                  bWatchSubtree,
  DWORD                 dwNotifyFilter,
  LPDWORD               lpBytesReturned,
  LPOVERLAPPED          lpOverlapped,
  LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine
);

#include <stdio.h>
#include <Windows.h>
#include <tlhelp32.h>

DWORD WINAPI MonitorFileThreadProc(LPVOID lParam)
{
  char *pszDirectory = (char *)lParam;
  BOOL bRet = FALSE;
  BYTE Buffer[1024] = { 0 };

  FILE_NOTIFY_INFORMATION *pBuffer = (FILE_NOTIFY_INFORMATION *)Buffer;
  DWORD dwByteReturn = 0;
  HANDLE hFile = CreateFile(pszDirectory, FILE_LIST_DIRECTORY, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
    NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
  if (INVALID_HANDLE_VALUE == hFile)
    return 1;

  while (TRUE)
  {
    ZeroMemory(Buffer, sizeof(Buffer));
    // 设置监控目录回调函数
    bRet = ReadDirectoryChangesW(hFile,&Buffer,sizeof(Buffer),TRUE,
      FILE_NOTIFY_CHANGE_FILE_NAME |      // 修改文件名
      FILE_NOTIFY_CHANGE_ATTRIBUTES |     // 修改文件属性
      FILE_NOTIFY_CHANGE_LAST_WRITE,      // 最后一次写入
      &dwByteReturn, NULL, NULL);
    if (TRUE == bRet)
    {
      char szFileName[MAX_PATH] = { 0 };

      // 将宽字符转换成窄字符,宽字节字符串转多字节字符串
      WideCharToMultiByte(CP_ACP,0,pBuffer->FileName,(pBuffer->FileNameLength / 2),
        szFileName,MAX_PATH,NULL,NULL);

      // 将路径与文件连接成完整文件路径
      char FullFilePath[1024] = { 0 };
      strncpy(FullFilePath, pszDirectory, strlen(pszDirectory));
      strcat(FullFilePath, szFileName);

      switch (pBuffer->Action)
      {
        case FILE_ACTION_ADDED:
        {
          printf("添加: %s \n", FullFilePath); break;
        }
        case FILE_ACTION_REMOVED:
        {
          printf("删除: %s \n", FullFilePath); break;
        }
        case FILE_ACTION_MODIFIED:
        {
          printf("修改: %s \n", FullFilePath); break;
        }
        case FILE_ACTION_RENAMED_OLD_NAME:
        {
          printf("重命名: %s", szFileName);
          if (0 != pBuffer->NextEntryOffset)
          {
            FILE_NOTIFY_INFORMATION *tmpBuffer = (FILE_NOTIFY_INFORMATION *)
              ((DWORD)pBuffer + pBuffer->NextEntryOffset);
            switch (tmpBuffer->Action)
              {
                case FILE_ACTION_RENAMED_NEW_NAME:
                {
                  ZeroMemory(szFileName, MAX_PATH);
                  WideCharToMultiByte(CP_ACP,0,tmpBuffer->FileName,
                    (tmpBuffer->FileNameLength / 2),
                    szFileName,MAX_PATH,NULL,NULL);
                  printf(" -> %s \n", szFileName);
                  break;
                }
              }
          }
          break;
        }
        case FILE_ACTION_RENAMED_NEW_NAME:
        {
          printf("重命名(new): %s \n", FullFilePath); break;
        }
      }
    }
  }
  CloseHandle(hFile);
  return 0;
}

int main(int argc, char * argv[])
{
  char *pszDirectory = "C:\\";

  HANDLE hThread = CreateThread(NULL, 0, MonitorFileThreadProc, pszDirectory, 0, NULL);
  WaitForSingleObject(hThread, INFINITE);
  CloseHandle(hThread);
  return 0;
}