用于公司考勤用，程序中调用一个射频卡的读卡器。射频卡可是使用员工现有的如公交卡，射频饭卡等。软件中设置上班下班，并进行每月的出勤统计。-Attendance for the company, and the procedure to call a radio frequency card reader. However, the use of radio frequency card, such as the existing employee bus cards, radio frequenc