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用下面的宏代码可以打开或关闭电脑中默认的光驱。方法是：

1.按Alt+F11打开VBA编辑器。

2.在代码窗口中输入下列代码：

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()
'打开光驱
mciSendStringA "Set CDAudio Door Open", 0&, 0, 0
End Sub

Sub CloseDefaultCDDVD()
'关闭光驱
mciSendStringA "Set CDAudio Door Closed", 0&, 0, 0
End Sub