vbnet 在autocad当中读取dmx图层的所有多段线点坐标

在 VB.NET 中，可以使用 Autodesk.AutoCAD.Interop 命名空间来与 AutoCAD 进行交互。要读取 DMX 图层的所有多段线点坐标，可以按照以下步骤进行：

在项目中添加对 Autodesk.AutoCAD.Interop 的引用。
创建一个 AcadApplication 对象并启动 AutoCAD。

Dim acadApp As New Autodesk.AutoCAD.Interop.AcadApplication()
acadApp.Visible = True ' 设置 AutoCAD 可见

打开 AutoCAD 文件。

Dim acadDoc As Autodesk.AutoCAD.Interop.AcadDocument = acadApp.Documents.Open("C:\path\to\your\file.dwg")

获取图层对象。

Dim layers As Autodesk.AutoCAD.Interop.AcadLayers = acadDoc.Layers
Dim dmxLayer As Autodesk.AutoCAD.Interop.AcadLayer = layers.Item("DMX") ' 替换为你的 DMX 图层名称

获取多段线对象。

Dim entities As Autodesk.AutoCAD.Interop.AcadEntities = acadDoc.ModelSpace
Dim polylines As Autodesk.AutoCAD.Interop.AcadPolylines = entities.Query("LWPOLYLINE")
Dim dmxPolylines As New List(Of Autodesk.AutoCAD.Interop.AcadLWPolyline)()

For Each polyline As Autodesk.AutoCAD.Interop.AcadLWPolyline In polylines
    If polyline.Layer = dmxLayer.Name Then
        dmxPolylines.Add(polyline)
    End If
Next

遍历每个多段线，获取其顶点坐标。

For Each dmxPolyline As Autodesk.AutoCAD.Interop.AcadLWPolyline In dmxPolylines
    Dim points As Autodesk.AutoCAD.Interop.AcadPoints = dmxPolyline.Coordinates

    For i As Integer = 0 To points.Count - 1
        Dim point As Autodesk.AutoCAD.Interop.AcadPoint = points.Item(i)
        Dim x As Double = point.Coordinate(0)
        Dim y As Double = point.Coordinate(1)
        Dim z As Double = point.Coordinate(2)

        Console.WriteLine($"Point {i + 1}: X={x}, Y={y}, Z={z}")
    Next
Next

关闭 AutoCAD。

acadApp.Quit()

以上代码将遍历指定图层中的所有多段线，并输出每个多段线的顶点坐标。请根据实际情况修改图层名称和文件路径。