VB CAD插件二次开发

<pre name="code" class="vb">Dim acadapp As AcadApplication   '在窗体代码声明段定义acadapp
Private Sub Command1_Click()
acadapp.Documents.Add  '创建新的图形文件
End Sub

Private Sub Command2_Click()
Dim myfilename As String
Me.CommonDialog1.ShowOpen
myfilename = Me.CommonDialog1.FileName
If myfilename <> "" Then
    acadapp.Documents.Open myfilename
End If
End Sub

Private Sub Command3_Click()
Dim savename As String
Me.CommonDialog1.ShowSave
savename = Me.CommonDialog1.FileName
If savename <> "" Then
    acadapp.ActiveDocument.SaveAs savename
End If
End Sub

Private Sub Command4_Click()
If Not acadapp.ActiveDocument.Saved Then
    If MsgBox("是否保存文件？", vbYesNo) = vbYes Then
        acadapp.ActiveDocument.Save
    End If
End If
End Sub

Private Sub Command5_Click()
acadapp.ActiveDocument.Close (True)  '以当前文件名和路径保存修改后的图形文件，然后关闭文件，若为False则不修改即保存

End Sub

Private Sub Form_Load()

On Error Resume Next
Set acadapp = GetObject(, "autocad.application")
If Err Then
    Err.Clear
    Set acadapp = CreateObject("autocad.application")
    If Err Then
        MsgBox ("不能运行AutoCad,请检查是否安装了CAD")
        Exit Sub
    End If
End If
acadapp.Visible = True

End Sub