德卡D8读卡器C#测试程序，用于测试与D8读卡器的通信，实现了读卡器的初始化，蜂鸣，密码校验和读写卡操作。-A test program for D&C s D8 card reader, it is used to test the communication with the D8 reader, and it has achieved the operation of the Initialization, beep, password checking reading and writi