vc++ 监控指定路径下文件变化实现代码

# include < iostream > # include < windows.h > # include < process.h > # include < tchar.h > # include < string >using namespace std;typedef void( * CHANGESCALLBACK)(const std::wstring strFileName);/*@ 监控指定目录下文件变化@ strDirPath 需要监控的目录@ dwChangesType 需要监控文件变化方式@ onCallBack 变化后的回调处理函数 */void CheckFilesChanges(const std::wstring strDirPath, DWORD dwChangesType, CHANGESCALLBACK onCallBack);void PrintMsg(const std::wstring strFileName) {  wprintf_s(L "new add File:/t %s/r/n", strFileName.c_str());}void CheckFilesChanges(const std::wstring strDirPath, DWORD dwChangesType, CHANGESCALLBACK onCallBack) {  if (strDirPath.empty() || !onCallBack)    return;  HANDLE hDir = INVALID_HANDLE_VALUE;  BYTE lpBuffer[1024];  ZeroMemory(lpBuffer, 1024);  DWORD cbBytes = NULL;  BOOL isOk = FALSE;  FILE_NOTIFY_INFORMATION * pnotify = (FILE_NOTIFY_INFORMATION * )lpBuffer;  FILE_NOTIFY_INFORMATION * tmp;  ZeroMemory( & lpBuffer, sizeof(FILE_NOTIFY_INFORMATION));  hDir = CreateFile(strDirPath.c_str(), FILE_LIST_DIRECTORY,      FILE_SHARE_READ |      FILE_SHARE_WRITE |      FILE_SHARE_DELETE, NULL,      OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS |      FILE_FLAG_OVERLAPPED, NULL);  if (INVALID_HANDLE_VALUE == hDir)    return;  while (true) {    isOk = ReadDirectoryChangesW(hDir, & lpBuffer,        sizeof(lpBuffer),        TRUE,        FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_LAST_WRITE,         & cbBytes,        NULL,        NULL);    if (isOk) {      tmp = pnotify;      PWSTR fileName = nullptr;      std::wstring strFileName;      if (tmp->FileNameLength) {        DWORD dwLength = tmp->FileNameLength + 1;        fileName = new wchar_t[dwLength];        if (fileName) {          memset(fileName, 0, dwLength * 2);          memcpy(fileName, tmp->FileName, dwLength * 2);          strFileName = fileName;        }        if (fileName)          delete []fileName;      }      if (tmp->Action == dwChangesType) {        onCallBack(strFileName);      }      ZeroMemory(tmp, 1024);      /*switch (tmp->Action){      case FILE_ACTION_ADDED: //当前目录新增文件{      onCallBack(strFileName);      }break;       case FILE_ACTION_REMOVED:  //该文件已从目录中删除{      onCallBack(strFileName);      }      break;      case FILE_ACTION_MODIFIED: //该文件已被修改。也可以是时间戳或属性的更改{      onCallBack(strFileName);      }      break;      case FILE_ACTION_RENAMED_OLD_NAME: //该文件已重命名，这是旧名称。{      onCallBack(strFileName);      }      break;      case FILE_ACTION_RENAMED_NEW_NAME: //该文件已重命名，这是新名称。{      onCallBack(strFileName);      }      break;      default:      break;      }*/    }  }  CloseHandle(hDir);}unsigned int CALLBACK ThreadProc(void * arg) {  CheckFilesChanges(_T("E://GoCode"), FILE_ACTION_ADDED, PrintMsg);  return 0;}int main(int argc, char * argv[]) {  HANDLE hThread = NULL;  hThread = (HANDLE)::_beginthreadex(nullptr, NULL, ThreadProc, NULL, NULL, NULL);  system("pause");  return 0;}