在程序中如何打开和关闭光驱门

　　  API函数声明如下:
Private 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

'    调用时的代码如下
Dim Ret As Long
Dim RetStr As String
'打开光驱门
Ret = mciSendString("set CDAudio door open", RetStr, 0, 0)
'关闭光驱门
Ret = mciSendString("set CDAudio door closed", RetStr, 0, 0)

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