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)