topic Re: CPython 3, Apply loads to Load cases in Robot Structural Analysis Forum

CPython 3, Apply loads to Load cases

stefanyC6JZ7 — Wed, 17 Aug 2022 15:26:27 GMT

Hi all,

We are trying to migrate our scripts from IronPython2 to CPython3.

I am trying to apply loads to the load case "GCW" as picture shows. The original script is attached, it was done with version IronPython2 and it works, however when turning to CPython 3, there are some errors.

Warning: AttributeError : '__ComObject' object has no attribute 'Records' [' File "<string>", line 32, in <module>\n']

and I got problems with IRobotLoadRecordMngr.Count. Could you help me checking what is wrong with the script?

Thank you in advance.

Files are attached.

Best regards,

Stefany

import clr clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * from System import Environment user = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) sys.path.append(user+r"\Dynamo\Dynamo Core\2.11\packages\Structural Analysis for Dynamo\bin\RSA\Interop.RobotOM.dll") clr.AddReference('interop.RobotOM') #clr.AddReference(user+r"\Dynamo\Dynamo Core\2.11\packages\Structural Analysis for Dynamo\bin\RSA\Interop.RobotOM.dll") from RobotOM import * from System import Object objects = IN[0] LoadCaseID = IN[1] ILRT = IN[2] LoadPX = IN[3] LoadPY = IN[4] LoadPZ = IN[5] application = RobotApplicationClass() project = application.Project structure = project.Structure labels = structure.Labels loads = structure.Cases CreatedLoads = [] case = structure.Cases.Get(LoadCaseID) simplecase = IRobotSimpleCase simplecase = case rec = IRobotLoadRecord IRobotLoadRecordMngr = simplecase.Records count = IRobotLoadRecordMngr.Count for i in range(count+1)[::-1]: rec = simplecase.Records.Delete(i) #for i in range(1,count+1,1): # rec = simplecase.Records.Delete(i) for j in range(len(objects)): for k in range(len(objects[j])): Uniform = [] Uniform.append(simplecase.Records.New(ILRT)) LoadRecord = simplecase.Records.Get(Uniform[0]) LoadRecord.SetValue(0,LoadPX) LoadRecord.SetValue(1,LoadPY) LoadRecord.SetValue(2,LoadPZ[j]) LoadRecord.Objects.FromText(objects[j][k]) CreatedLoads.append(LoadRecord.UniqueID) application.Visible = True application.Interactive = True application.Project.ViewMngr.Refresh() #Assign your output to the OUT variable. OUT = CreatedLoads, count

Re: CPython 3, Apply loads to Load cases

1234eddie — Wed, 17 Aug 2022 16:10:32 GMT

Hi All,

Some of you may recognise these text from the script. @stefanyC6JZ7 is my colleague.

@JacquesGaudin @cool.stuff @chjpcoi

Hope someone of you explain to us what is nessesary to get our scripts to Cpython3.

Thanks in advance.

Gr Edward

Re: CPython 3, Apply loads to Load cases

JacquesGaudin — Wed, 17 Aug 2022 18:33:03 GMT

Try this?

import clr clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * from System import Environment user = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) sys.path.append(user+r"\Dynamo\Dynamo Core\2.11\packages\Structural Analysis for Dynamo\bin\RSA\Interop.RobotOM.dll") clr.AddReference('interop.RobotOM') from System import Object objects = IN[0] LoadCaseID = IN[1] ILRT = IN[2] LoadPX = IN[3] LoadPY = IN[4] LoadPZ = IN[5] application = RobotApplicationClass() project = application.Project structure = project.Structure labels = structure.Labels loads = structure.Cases CreatedLoads = [] case = structure.Cases.Get(LoadCaseID) simplecase = IRobotSimpleCase(case) rec = IRobotLoadRecordMngr(simplecase.Records) count = rec.Count for i in range(count+1)[::-1]: rec.Delete(i) #for i in range(1,count+1,1): # rec = simplecase.Records.Delete(i) for j in range(len(objects)): for k in range(len(objects[j])): Uniform = [] Uniform.append(rec.New(ILRT)) LoadRecord = rec.Get(Uniform[0]) LoadRecord.SetValue(0,LoadPX) LoadRecord.SetValue(1,LoadPY) LoadRecord.SetValue(2,LoadPZ[j]) LoadRecord.Objects.FromText(objects[j][k]) CreatedLoads.append(LoadRecord.UniqueID) application.Visible = True application.Interactive = True application.Project.ViewMngr.Refresh() #Assign your output to the OUT variable. OUT = CreatedLoads, count

Re: CPython 3, Apply loads to Load cases

stefanyC6JZ7 — Thu, 18 Aug 2022 07:16:52 GMT

Hi @JacquesGaudin,

Thank you for your reply. I have tried the code you suggested, but it is not working completely. The first part of the script runs without a problem, at line 42 the set value does not correspond because of the com_object error, please see picture below.

what could be a solution for this one?

as a test i did turn line 42-46 off. the loop and everything then works.

Thank you in advance.

Best regards,

Stefany

Re: CPython 3, Apply loads to Load cases

1234eddie — Thu, 18 Aug 2022 07:49:29 GMT

@JacquesGaudin

we still having problems with this one. i did a little dig in the api.

i think i know why this happens, but don't know how to solve it.

Setvalue is part of Irobotloadrecord,

And our definition of loadrecord in the script is (if i'm right) part of IRobotLoadRecordMngr

could this be the problem.

Gr Edward

Re: CPython 3, Apply loads to Load cases

JacquesGaudin — Thu, 18 Aug 2022 08:32:28 GMT

@1234eddie @stefanyC6JZ7

You are right, the `SetValue` method is not available because `LoadRecord` is not recognised as a IRobotLoadRecord object but rather a generic COM object.

In general, when this happens, the solution is to just cast the object to the expected type:

LoadRecord = IRobotLoadRecord(rec.Get(Uniform[0])) # This forces the result of the `Get` method to be cast to IRobotLoadRecord # In general: # my_obj = ExpectedType(object_server.Get(i))

This is due to the way PythonNet works and to the fact that there is no such things as interfaces in Python.

IronPython was dealing with the interface types under the hood but PythonNet doesn't do that, leaving some objects with a generic COM object type. To gain access to the methods of the object, it is necessary to cast the object to the correct type.

import clr clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * from System import Environment user = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) sys.path.append(user+r"\Dynamo\Dynamo Core\2.11\packages\Structural Analysis for Dynamo\bin\RSA\Interop.RobotOM.dll") clr.AddReference('interop.RobotOM') from System import Object objects = IN[0] LoadCaseID = IN[1] ILRT = IN[2] LoadPX = IN[3] LoadPY = IN[4] LoadPZ = IN[5] application = RobotApplicationClass() project = application.Project structure = project.Structure labels = structure.Labels loads = structure.Cases CreatedLoads = [] case = structure.Cases.Get(LoadCaseID) simplecase = IRobotSimpleCase(case) rec = IRobotLoadRecordMngr(simplecase.Records) count = rec.Count for i in range(count+1)[::-1]: rec.Delete(i) for j in range(len(objects)): for k in range(len(objects[j])): Uniform = [] Uniform.append(rec.New(ILRT)) LoadRecord = IRobotLoadRecord(rec.Get(Uniform[0])) LoadRecord.SetValue(0,LoadPX) LoadRecord.SetValue(1,LoadPY) LoadRecord.SetValue(2,LoadPZ[j]) LoadRecord.Objects.FromText(objects[j][k]) CreatedLoads.append(LoadRecord.UniqueID) application.Visible = True application.Interactive = True application.Project.ViewMngr.Refresh() #Assign your output to the OUT variable. OUT = CreatedLoads, count

Re: CPython 3, Apply loads to Load cases

stefanyC6JZ7 — Thu, 18 Aug 2022 11:35:13 GMT

Hi @JacquesGaudin,

Thank you for your reply, and for your help. Now the code works better, loads are applied to the load case, see picture below. But, I got an error with lines 48 and 49.

Warning: TypeError : No method matches given arguments for FromText: (<class 'int'>) [' File "<string>", line 48, in <module>\n']

Warning: AttributeError : 'IRobotLoadRecord' object has no attribute 'UniqueId' [' File "<string>", line 49, in <module>\n']

Could you help me to solve it?

import clr clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * from System import Environment user = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) #sys.path.append(user+r"\Dynamo\Dynamo Core\2.11\packages\Structural Analysis for Dynamo\bin\RSA\Interop.RobotOM.dll") #clr.AddReference('interop.RobotOM') clr.AddReference(user+r"\Dynamo\Dynamo Core\2.11\packages\Structural Analysis for Dynamo\bin\RSA\Interop.RobotOM.dll") from RobotOM import * from System import Object objects = IN[0] LoadCaseID = IN[1] ILRT = IN[2] LoadPX = IN[3] LoadPY = IN[4] LoadPZ = IN[5] application = RobotApplicationClass() project = application.Project structure = project.Structure labels = structure.Labels loads = structure.Cases CreatedLoads = [] case = structure.Cases.Get(LoadCaseID) simplecase = IRobotSimpleCase(case) rec = IRobotLoadRecordMngr(simplecase.Records) #rec1 = IRobotLoadRecord(simplecase.Records) count = rec.Count for i in range(count+1)[::-1]: rec.Delete(i) #for i in range(1,count+1,1): # rec = simplecase.Records.Delete(i) for j in range(len(objects)): for k in range(len(objects[j])): Uniform = [] Uniform.append(rec.New(ILRT)) LoadRecord = IRobotLoadRecord(rec.Get(Uniform[0])) #LoadRecord.SetValue(LoadPZ[j]) LoadRecord.SetValue(0,LoadPX) LoadRecord.SetValue(1,LoadPY) LoadRecord.SetValue(2,LoadPZ[j]) LoadRecord.Objects.FromText(objects[j][k]) CreatedLoads.append(LoadRecord.UniqueId) #selection_bars = structure.Bars.Get(objects[j][k]) #LoadRecord.Objects.FromText(objects[j][k]) #LoadRecord.Objects = '1' #LoadRecord.Objects.FromText(objects[j][k]) application.Visible = True application.Interactive = True application.Project.ViewMngr.Refresh() #Assign your output to the OUT variable. OUT = objects, selection_bars #OUT = CreatedLoads, count

Thank you in advance for you help.

Best regards,

Stefany

Re: CPython 3, Apply loads to Load cases

JacquesGaudin — Thu, 18 Aug 2022 12:21:17 GMT

The first error is because the `FromText` method expects a string argument, not an integer. Just cast the integer to a string to fix it.

LoadRecord.Objects.FromText(str(objects[j][k]))

The second is because the IRobotLoadRecord interface doesn't provide `UniqueId` as an attribute. To access it you have to use an interface that derives from IRobotLoadRecord but is more specific. For a uniformly distributed load, it is IRobotLoadRecordLinear3D.

for j in range(len(objects)): for k in range(len(objects[j])): Uniform = [] Uniform.append(rec.New(ILRT)) LoadRecord = IRobotLoadRecordLinear3D(rec.Get(Uniform[0])) # A more specific interface must be used LoadRecord.SetValue(0,LoadPX) LoadRecord.SetValue(1,LoadPY) LoadRecord.SetValue(2,LoadPZ[j]) LoadRecord.Objects.FromText(str(objects[j][k])) # Converts integer to str CreatedLoads.append(LoadRecord.UniqueId)

Note you could apply the same loads with this:

for obj_lst in objects: Uniform = [] Uniform.append(rec.New(ILRT)) LoadRecord = IRobotLoadRecordLinear3D(rec.Get(Uniform[0])) LoadRecord.SetValue(0,LoadPX) LoadRecord.SetValue(1,LoadPY) LoadRecord.SetValue(2,LoadPZ[j]) LoadRecord.Objects.FromText(' '.join(str(el) for el in obj_lst) CreatedLoads.append(LoadRecord.UniqueId)

Re: CPython 3, Apply loads to Load cases

stefanyC6JZ7 — Thu, 18 Aug 2022 13:16:25 GMT

Hi @JacquesGaudin,

Thank you very much for your help and patience with us while trying to fix the script. Now it is working, and I am happy to share the results below.

Have a nice day!

Best regards,

Stefany