可以使用COM技术，在VB中直接操作AutoCAD，创建于VBA功能类似的程序，VB能够直接打包生成安装文件，这种形式比VBA更加方便，并且更容易保护自己的程序。VB连接到AutoCAD主要用到CreateObject和GetObject函数，创建或者获得对ActiveX对象的引用。
连接到AutoCAD之后，就可以使用acadApp对象对AutoCAD进行操作，语法和操作方法与VBA完全一致。
下面这段代码创建一个绘制楼梯剖面图的程序。
Dim bcal As Boolean
Dim ptarr1() As Double
Dim ptarr2(19) As Double
Private Sub cmdcal_Click()
Dim objcontrol As Control
For Each objcontrol In Form1.Controls
If TypeOf objcontrol Is TextBox Then
If objcontrol.Text = "" Then
MsgBox "缺少参数，无法计算！", vbCritical
Exit Sub
End If
End If
Next
Dim x0 As Double, y0 As Double
Dim s As Double, t As Double, n As Double
Dim b As Double, h As Double, h0 As Double
x0 = txtptx.Text: y0 = txtpty.Text
s = txtsteph.Text: t = txtstepw.Text: n = txtstepnum.Text
b = txtgriderw.Text: h = txtgriderh.Text: h0 = txtboardt.Text
If h0 >= h Or b > 80 Or s >= t Then
MsgBox "输入条件不符合要求，请检查参数的合理性！", vbCritical
Exit Sub
End If
ReDim ptarr1(2 * (2 * n + 2) – 1)
ptarr1(0) = x0 – 100: ptarr1(1) = y0
ptarr1(2) = x0: ptarr1(3) = y0
ptarr1(4) = x0: ptarr1(5) = y0 + s
Dim i As Integer
For i = 6 To 2 * (2 * n + 2) – 3
If i Mod 4 = 2 Then
ptarr1(i) = ptarr1(i – 4) + t
ElseIf i Mod 4 = 3 Then
ptarr1(i) = ptarr1(i – 4) + s
ElseIf i Mod 4 = 0 Then
ptarr1(i) = ptarr1(i – 2)
ElseIf i Mod 4 = 1 Then
ptarr1(i) = ptarr1(i – 2) + s
End If
Next i
ptarr1(2 * (2 * n + 2) – 2) = ptarr1(2 * (2 * n + 2) – 4) + 100
ptarr1(2 * (2 * n + 2) – 1) = ptarr1(2 * (2 * n + 2) – 3)
ptarr2(0) = x0 – 100: ptarr2(1) = y0 – h0
ptarr2(2) = x0 – b: ptarr2(3) = y0 – h0
ptarr2(4) = x0 – b: ptarr2(5) = y0 – h
ptarr2(6) = x0: ptarr2(7) = y0 – h
ptarr2(8) = x0: ptarr2(9) = y0 – h0
ptarr2(10) = x0 + (n – 1) * t: ptarr2(11) = y0 + (n – 1) * s – h0
ptarr2(12) = ptarr1(2 * (2 * n + 2) – 4): ptarr2(13) = ptarr1(2 * (2 * n + 2) – 3) – h
ptarr2(14) = ptarr2(12) + b: ptarr2(15) = ptarr2(13)
ptarr2(16) = ptarr2(14): ptarr2(17) = ptarr2(15) + (h – h0) #p#分页标题#e#
ptarr2(18) = ptarr1(2 * (2 * n + 2) – 2): ptarr2(19) = ptarr1(2 * (2 * n + 2) – 1) – h0
bcal = True
End Sub
Private Sub cmddraw_Click()
If bcal = False Then
MsgBox "请先进行计算，再进行绘图！", vbCritical
Exit Sub
End If
On Error Resume Next
Dim acadapp As AcadApplication
Set acadapp = GetObject(, "AutoCAD.Application.16")
If Err Then
Err.Clear
‘MsgBox "sssssssssssss"
‘Set acadapp = CreatObject("AutoCAD.Application.16")
If Err Then
MsgBox Err.Description
Exit Sub
End If
End If
Dim acaddoc As AcadDocument
Set acaddoc = acadapp.ActiveDocument
acaddoc.ModelSpace.AddLightWeightPolyline ptarr1
acaddoc.ModelSpace.AddLightWeightPolyline ptarr2
ZoomAll
acadapp.Visible = True
bcal = False
End Sub
Private Sub cmdexit_Click()
End
End Sub
Private Sub Form_Load()
txtptx.Text = 0
txtpty.Text = 0
txtptz.Text = 0
txtsteph.Text = 20
txtstepw.Text = 40
txtstepnum.Text = 10
txtgriderw.Text = 25
txtgriderh.Text = 45
txtboardt.Text = 15
bcal = False
End Sub
因为VB和AutoCAD之间是通过COM技术连接，这种数据交换对系统资源的消耗很大，同样的计算在VB运算消耗的时间比在VBA中的运算时间要多5倍以上，在VB中按F5键运行程序，可以在Form中对楼梯参数进行设置，就可在CAD中绘制楼梯剖面图。创建VB程序时要尽可能减少程序和AutoCAD之间的数据交换，所有计算尽量在VB中完成，直接传递给AutoCAD计算结果，使CAD可以直接根据结果进行绘图。在VB中按下F5键，单击绘图按钮即可在CAD中看到绘制的楼梯剖面图。