用VB写一个SolidWorks的工程图图幅计算函数

以下是使用VB编写的计算SolidWorks工程图图幅的示例函数：

Imports SolidWorks.Interop.sldworks
Imports SolidWorks.Interop.swconst

Public Class SolidWorksHelper

    Public Function CalculateDrawingScale(width As Double, height As Double) As String
        Dim swApp As SldWorks = Nothing
        Dim swModel As ModelDoc2 = Nothing
        Dim swDraw As DrawingDoc = Nothing
        Dim swSheet As Sheet = Nothing

        Try
            ' 创建SolidWorks应用程序对象
            swApp = CreateObject("SldWorks.Application")
            swApp.Visible = False

            ' 打开工程图文件
            swModel = swApp.OpenDoc6("path_to_drawing_file", swDocumentTypes_e.swDocDRAWING, swOpenDocOptions_e.swOpenDocOptions_Silent, "", 0, 0)

            ' 转换为DrawingDoc对象
            swDraw = DirectCast(swModel, DrawingDoc)

            ' 获取第一个图纸页
            swSheet = swDraw.GetCurrentSheet()

            ' 获取图纸页的比例尺
            Dim scale As Double = swSheet.Scale2

            ' 计算图幅
            Dim drawingWidth As Double = width / scale
            Dim drawingHeight As Double = height / scale

            ' 返回图幅结果
            Return "图幅：" & drawingWidth & "mm x " & drawingHeight & "mm"
        Catch ex As Exception
            Return "错误：" & ex.Message
        Finally
            ' 释放资源
            If Not IsNothing(swSheet) Then Marshal.ReleaseComObject(swSheet)
            If Not IsNothing(swDraw) Then Marshal.ReleaseComObject(swDraw)
            If Not IsNothing(swModel) Then swModel.Close()
            If Not IsNothing(swApp) Then swApp.ExitApp()
        End Try
    End Function

End Class

请注意，这只是一个示例函数，您需要根据您的具体需求进行适当的修改和调整。在使用此函数之前，请确保已安装SolidWorks软件，并将"SolidWorks.Interop.sldworks"和"SolidWorks.Interop.swconst"添加到项目的引用中。

此函数接受工程图的宽度和高度作为参数，并返回计算后的图幅结果。您需要将"path_to_drawing_file"替换为实际的工程图文件路径。

希望这能帮助到您！如有其他问题，请随时提问。