Problem with LoadFlowsheet in DWSIM v7.1.2

[Lucas Francisco dos Santos]

Hey all,

I just updated DWSIM from version 7 to 7.1.2, and I am facing an issue with DWSIM.Automation.Automation2.LoadFlowsheet when loading a DWSIM simulation into my Python package. It was working properly right before updating. Does anybody have the same issue? I am pasting the error verbose here:

FileNotFoundException: Não foi possível carregar arquivo ou assembly 'System.Buffers, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' ou uma de suas dependências. O sistema não pode encontrar o arquivo especificado.
   em SkiaSharp.SKManagedStream.CopyTo(SKWStream destination)
   em SkiaSharp.SKManagedStream.ToMemoryStream()
   em SkiaSharp.SKTypeface.FromStream(SKStreamAsset stream, Int32 index)
   em DWSIM.Drawing.SkiaSharp.GraphicsSurface..ctor() na C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.Drawing.SkiaSharp\GraphicsSurface\DesignSurface.vb:linha 87
   em DWSIM.FlowsheetBase.FlowsheetBase..ctor() na C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.FlowsheetBase\FlowsheetBase.vb:linha 42
   em DWSIM.UI.Forms.Flowsheet.InitializeComponent() na C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.UI.Desktop.Forms\Forms\Flowsheet\Flowsheet.eto.cs:linha 161
   em DWSIM.Automation.Automation2.LoadFlowsheet(String filepath) na C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.Automation\Interface.cs:linha 158

Ps1: I checked the path to the simulation, and it is accurate.
Ps2: The references to the DWSIM dlls have been added successfully, i.e I can instanciate a DWSIM.Automation.Automation2.LoadFlowsheet object but I cannot load a simulation.

[Daniel Medeiros]

Try adding a reference to System.Buffers.dll, it should be there in DWSIM's directory.

[Lucas Francisco dos Santos]

I added reference to System.Buffers.dll, but I still got the same issue:

Traceback (most recent call last): File "C:\Users\lfsfr\Desktop\pyDWSIMopt\examples\SMR_LNG\bug_LoadFlowsheet.py", line 33, in <module> flowsheet = interf.LoadFlowsheet(path2sim) System.IO.FileNotFoundException: Não foi possível carregar arquivo ou assembly 'System.Buffers, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' ou uma de suas dependências. O sistema não pode encontrar o arquivo especificado. em SkiaSharp.SKManagedStream.CopyTo(SKWStream destination) em SkiaSharp.SKManagedStream.ToMemoryStream() em SkiaSharp.SKTypeface.FromStream(SKStreamAsset stream, Int32 index) em DWSIM.Drawing.SkiaSharp.GraphicsSurface..ctor() na C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.Drawing.SkiaSharp\GraphicsSurface\DesignSurface.vb:linha 87 em DWSIM.FlowsheetBase.FlowsheetBase..ctor() na C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.FlowsheetBase\FlowsheetBase.vb:linha 42 em DWSIM.UI.Forms.Flowsheet.InitializeComponent() na C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.UI.Desktop.Forms\Forms\Flowsheet\Flowsheet.eto.cs:linha 161 em DWSIM.Automation.Automation2.LoadFlowsheet(String filepath) na C:\Users\Daniel\source\repos\DanWBR\dwsim\DWSIM.Automation\Interface.cs:linha 158

I am running:
- Python 3.9.1,
- DWSIM v7.1.2,
- pythonnet 2.5.2

A minimalistic code to reproduce the error:

import pythoncom
pythoncom.CoInitialize()
import clr

path2dwsim = "C:\\Users\\lfsfr\\AppData\\Local\\DWSIM7\\"

clr.AddReference(path2dwsim + "CapeOpen.dll")
clr.AddReference(path2dwsim + "DWSIM.Automation.dll")
clr.AddReference(path2dwsim + "DWSIM.Interfaces.dll")
clr.AddReference(path2dwsim + "DWSIM.GlobalSettings.dll")
clr.AddReference(path2dwsim + "DWSIM.SharedClasses.dll")
clr.AddReference(path2dwsim + "DWSIM.Thermodynamics.dll")
clr.AddReference(path2dwsim + "DWSIM.UnitOperations.dll")

clr.AddReference(path2dwsim + "DWSIM.Inspector.dll")
clr.AddReference(path2dwsim + "DWSIM.MathOps.dll")
clr.AddReference(path2dwsim + "TcpComm.dll")
clr.AddReference(path2dwsim + "Microsoft.ServiceBus.dll")
clr.AddReference(path2dwsim + "System.Buffers.dll")
clr.AddReference(path2dwsim + "SkiaSharp.dll")

path2sim = "C:\\path\\to\\sim.dwxmz"

from DWSIM.Automation import Automation2
interf = Automation2() # create automation manager

# load simulation
flowsheet = interf.LoadFlowsheet(path2sim)

[Daniel Medeiros]

The current workaround is to put this dll somewhere else and then add a reference to it in your python code before creating the automation instance.

[Lucas Francisco dos Santos]

That worked! Thanks a lot Daniel!

For the record, one may need to register this new System.Buffers.dll in order to add a reference to it in a python code.