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Declare Function mciSendString Lib "winmm.dll" Alias "mciSendStringA" (ByVal lpstrCommand As String,_
                       ByVal lpSectorsPerCluster As String, ByVal uReturnLength As Long,_
                       ByVal hwndCallback As Long) As Long


Dim Com As String
Dim Back As String
Dim unkown As Long
Dim Ret As Long

Back=String$(255,Chr$(0))
Com="set cdaudio door open"     'もしくは "set cdaudio door Closed"

Ret=mciSendString(Com,Back,255,unkown)              '・・・・mciSendString(①,②,③,④)
If Ret=0 Then
MessageBox(0,"開けたよ","mciSendString",MB_OK)
Else
MessageBox(0,"失敗！","mciSendString",MB_OK)
EndIf

End