?用下面的宏代碼可以打開或關閉電腦中默認的光驅。方法是：

1.按Alt+F11打開VBA編輯器。

2.在代碼窗口中輸入下列代碼：

Private Declare Sub mciSendStringA Lib "winmm.dll" (ByVal lpstrCommand As String, _
ByVal lpstrReturnString As Any, ByVal uReturnLength As Long, _
ByVal hwndCallback As Long)

Sub OpenDefaultCDDVD()
'打開光驅
mciSendStringA "Set CDAudio Door Open", 0&, 0, 0
End Sub

Sub CloseDefaultCDDVD()
'關閉光驅
mciSendStringA "Set CDAudio Door Closed", 0&, 0, 0
End Sub