根据指定的输入输出文件顺序，定时的查找指定目录下的文件是否存在，并且根据设定的执行最长时限来判断是否需要继续查找该文件，若超时仍未找到该文件，则返回false，否则返回true，文件全路径-According to the order of input and output files specified, the search time to time under the specified directory file exists, and according to the set maximum time limit to determine whether the implementation of the need to continue to find the file, if the time-out yet to find the file, it returns false, Otherwise, it returns true, the full path to the file