程序说明： 本例使用API函数 CDdoor 来控制光驱门的开和关 程序十分简单，由于 CDdoor 函数自身包含了对异常 错误的处理机制，因此这个程序的通用性很高，你可 以把这段代码移植到你的程序中，实现某些多媒体播 放器所常用的开关光驱的功能-procedures Note : In this example, using the API function CDdoor drive to control the doors opened and the clearance process is very simple, self-contained CDdoor function of abnormal error handling mechanism, the process is highly generic, you can put this code into your program and some multimedia player All are commonly used in the switch drive functions