课程设计的小实验，实现一个学生成绩统计系统，其中涉及到对话框相互调用，及定时器还有 文件读写。-Curriculum design experiment, a student achievement statistics system, which involves the dialog box, call each other, and the timer also file read and write.

接口函数,主要用于发卡器操做，能够读写删除等操作-Interface Functions