如何使用 Inventor API 和 Python 访问装配体中出现的工作平面

Posted 2023-03-16

【中文标题】如何使用 Inventor API 和 Python 访问装配体中出现的工作平面

【英文标题】：How to Access WorkPlanes of Occurrences in Assemblies using the Inventor API with Python

【发布时间】：2021-09-10 22:42:37

【问题描述】：

我想使用带有 Python 的 Inventor API 在 Inventor 组件中的组件的基本坐标系的平面之间添加约束。组件的放置有效。我的问题是，我无法访问我个人事件定义中的工作平面。 我的代码如下所示：

import win32com.client as win32
project_folder = "C:\\Users\\User_1\\210608_project\\"

#initialization
inv = win32.gencache.EnsureDispatch('Inventor.Application')
inv.Visible = True

#Open a new assembly
inv.Documents.Add(win32.constants.kAssemblyDocumentObject, "", True)
invActDoc = inv.ActiveDocument
invAssDoc = win32.CastTo(invActDoc, 'AssemblyDocument')


#Create the transient matrices
oTG = inv.TransientGeometry
oMatrix = oTG.CreateMatrix()

#Add component to assembly
invAssDocDef = invAssDoc.ComponentDefinition
invAssOcc = invAssDocDef.Occurrences
occ1 = invAssOcc.Add(project_folder + 'generic_part_1.ipt', oMatrix)
occ2 = invAssOcc.Add(project_folder + 'generic_part_2.ipt', oMatrix)


#create constraints
#get the Planes of the Base-Coordinate-System of Part 1
wp_YZ_1 = occ1.Definition.WorkPlanes.Item(1)
wp_XZ_1 = occ1.Definition.WorkPlanes.Item(2)
wp_XY_1 = occ1.Definition.WorkPlanes.Item(3)

#get the Planes of the Base-Coordinate-System of Part 2
wp_YZ_2 = occ2.Definition.WorkPlanes.Item(1)
wp_XZ_2 = occ2.Definition.WorkPlanes.Item(2)
wp_XY_2 = occ2.Definition.WorkPlanes.Item(3)

#Add the constraints
AssCons = invAssDoc.ComponentDefinition.Constraints
AssCons.AddFlushConstraint(wp_YZ_1, wp_YZ_2, 0)
AssCons.AddFlushConstraint(wp_XZ_1, wp_XZ_2, 0)
AssCons.AddFlushConstraint(wp_XY_1, wp_XY_2, 0)

当我尝试获取 WorkPlanes 时它会中断：

Traceback (most recent call last):
  File "C:/Users/User1/210608_projekt/how_to_constrain_components_in_assemblies.py", line 27, in <module>
    wp1 = occ1.Definition.WorkPlanes.Item(1)
  File "C:\Program Files\Python37\lib\site-packages\win32com\client\__init__.py", line 473, in __getattr__
    raise AttributeError("'%s' object has no attribute '%s'" % (repr(self), attr))
AttributeError: '<win32com.gen_py.Autodesk Inventor Object Library.ComponentDefinition instance at 0x2748634277928>' object has no attribute 'WorkPlanes'

这发生在我尝试的所有事情上，即在 Occurrence.Item(i).Definition 中。

如果我在 VBA 脚本中打开同一个程序集，一切都在它应该在的地方。我是否遗漏了有关使用 API 处理事件的某些内容？

【参考方案1】：

这就是最后 3 个块的解决方案/替换的样子：

#cast the definitions to PartComponentDefinition
occ1_def = win32.CastTo(occ1.Definition, 'PartComponentDefinition')
occ2_def = win32.CastTo(occ2.Definition, 'PartComponentDefinition')

#create constraints
#get the Planes of the Base-Coordinate-System of Part 1
wp_YZ_1 = occ1_def.WorkPlanes.Item(1)
wp_XZ_1 = occ1_def.WorkPlanes.Item(2)
wp_XY_1 = occ1_def.WorkPlanes.Item(3)

#create Geometry-Proxys for Workplanes of Comp1
wp_YZ_1_proxy = occ1.CreateGeometryProxy(wp_YZ_1)
wp_XZ_1_proxy = occ1.CreateGeometryProxy(wp_XZ_1)
wp_XY_1_proxy = occ1.CreateGeometryProxy(wp_XY_1)


#get the Planes of the Base-Coordinate-System of Part 2
wp_YZ_2 = occ2_def.WorkPlanes.Item(1)
wp_XZ_2 = occ2_def.WorkPlanes.Item(2)
wp_XY_2 = occ2_def.WorkPlanes.Item(3)

#create Geometry-Proxys for Workplanes of Comp2
wp_YZ_2_proxy = occ2.CreateGeometryProxy(wp_YZ_2)
wp_XZ_2_proxy = occ2.CreateGeometryProxy(wp_XZ_2)
wp_XY_2_proxy = occ2.CreateGeometryProxy(wp_XY_2)

#Add the constraints
AssCons = invAssDoc.ComponentDefinition.Constraints
AssCons.AddFlushConstraint(wp_YZ_1_proxy, wp_YZ_2_proxy, 0)
AssCons.AddFlushConstraint(wp_XZ_1_proxy, wp_XZ_2_proxy, 0)
AssCons.AddFlushConstraint(wp_XY_1_proxy, wp_XY_2_proxy, 0)

【参考方案2】：

您需要创建WorkPlane 的WorkPlaneProxy 对象。这意味着在装配中特定事件的上下文中部分定义的工作平面的表示

这是部分 VB.NET 代码

'Define variables for workplane proxy
Dim wp_YZ_1_proxy As WorkPlaneProxy
Dim wp_YZ_2_proxy As WorkPlaneProxy

'You need to pass result variable as argument
' ByRef in VB.NET, out in C#
'I don't know how to do in Python 
occ1.CreateGeometryProxy(wp_YZ_1, wp_YZ_1_proxy)
occ2.CreateGeometryProxy(wp_YZ_2, wp_YZ_2_proxy)

Dim AssCons As AssemblyConstraints = asm.Constraints

'Use this proxies for constraint creation
AssCons.AddFlushConstraint(wp_YZ_1_proxy, wp_YZ_2_proxy, 0)

【讨论】：

您好，谢谢您的回答。我认为您对 AddFlushConstraint 中的用法是正确的。我的问题是我首先无法获得 WorkPlane，所以我无法为其创建代理（对象没有属性“WorkPlanes”）。

好的，您需要将occ.Definition 转换为PartComponentDefinition 或AssemblyComponentDefinition。两者都派生自基本的ComponentDefinition，并且都具有WorkPlanes 属性。