vbnet 在autoCAD当中读取dmx图层每条多段线的交点坐标每条多段线的交点坐标分别存入数组分行输出到文本中

在vb.net中，可以使用AutoCAD的COM组件来读取dmx图层中每条多段线的交点坐标，并将其存入数组，最后将数组的内容分行输出到文本中。以下是一个示例代码：

Imports AutoCAD = Autodesk.AutoCAD.Interop

Module Module1
    Sub Main()
        ' 创建AutoCAD应用程序对象
        Dim acApp As New AutoCAD.Application

        ' 打开dmx图层
        Dim acDoc As AutoCAD.Document = acApp.Documents.Open("C:\Path\to\dmx.dwg")
        
        ' 获取图层中的多段线
        Dim acPolyLines As AutoCAD.AcadPolyline = acDoc.ModelSpace.Item("dmx")

        ' 创建一个数组来存储交点坐标
        Dim intersectionPoints As New List(Of String)

        ' 遍历每条多段线
        For i As Integer = 0 To acPolyLines.Count - 1
            Dim acPolyLine As AutoCAD.AcadPolyline = acPolyLines.Item(i)

            ' 获取多段线的交点
            Dim intersections As AutoCAD.AcadEntity = acPolyLine.GetIntersectingEntities(acPolyLines)

            ' 遍历每个交点
            For j As Integer = 0 To intersections.Count - 1
                Dim intersection As AutoCAD.AcadEntity = intersections.Item(j)
                Dim intersectionPoint As AutoCAD.AcadPoint = intersection.StartPoint

                ' 将交点坐标添加到数组中
                intersectionPoints.Add(intersectionPoint.Coordinates)
            Next
        Next

        ' 将数组的内容分行输出到文本文件
        Using writer As New System.IO.StreamWriter("C:\Path\to\output.txt")
            For Each point As String In intersectionPoints
                writer.WriteLine(point)
            Next
        End Using

        ' 关闭文档和AutoCAD应用程序
        acDoc.Close()
        acApp.Quit()
    End Sub
End Module

请注意，上述代码使用了AutoCAD的COM组件，因此需要引用Autodesk.AutoCAD.Interop命名空间。此外，还需要将AutoCAD的安装目录添加到项目的引用中。