打开和关闭CD-ROM 驱动器

声明：
Declare Function mciSendString Lib "winmm.dll" Alias _
"mciSendStringA" (ByVal lpstrCommand As String, ByVal _
lpstrReturnString As String, ByVal uReturnLength As Long, _
ByVal hwndCallback As Long) As Long 
使用：
'打开
retvalue = mcisendstring("set CDAudio door open", returnstring, 127, 0)
'关闭
retvalue = mcisendstring("set CDAudio door closed", returnstring, 127, 0)