获取文件创建时间 毫秒级 c++

bool FileTimeToTime_t(const char * szFileName, time_t *t)
{
	bool ret = false;
#ifdef _WIN32
	FILETIME ftCreate;
	HANDLE hFile = CreateFile(szFileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
	if (INVALID_HANDLE_VALUE != hFile){
		ret = GetFileTime(hFile, &ftCreate, NULL, NULL);
		if (ret){
			ULARGE_INTEGER ui;
			ui.LowPart = ftCreate.dwLowDateTime;
			ui.HighPart = ftCreate.dwHighDateTime;
			*t = ((LONGLONG)(ui.QuadPart - 116444736000000000) / 10000);
		}
		CloseHandle(hFile);
	}
#else
	//struct stat buf;
	//int nret = stat(szFileName, &buf);
	//if (nret == 0){
	//	time_t tTmp = buf.st_mtime;
	//	FILE * fp = NULL;
	//	char cmd[512] = { 0 };
	//	sprintf(cmd, "ls --full-time %s | awk 'NR==1{print $7;}' | awk -F \".\" '{print $2}' | cut -c1-3 ");
	//	if ((fp = popen(cmd, "r")) != NULL){
	//		fgets(cmd, sizeof(cmd), fp);
	//		pclose(fp);
	//		int usec = atoi(cmd);
	//		*t = tTmp * 1000 + usec;
	//		ret = true;
	//	}
	//}
	struct stat ss;
	if (stat(szFileName, &ss) == 0)
	{
#if (defined __USE_MISC || defined __USE_XOPEN2K8)
		*t = ss.st_mtim.tv_sec * 1000LL + ss.st_mtim.tv_nsec / 1000000;
#else
		*t = ss.st_mtime * 1000LL;
#endif
		ret = true;
	}

#endif
	return ret;
}