How to pass a variable to and from PCDMIS using Python?

What exactly happens when you try your script? I don't actually have PCDMIS but use a similar program...

There is also environment variables, which you could set in python and and use a VBA script to pull into PCDMIS, not sure how impractical that is though:

import os

os.environ["MYVARIABLE"] = "hello"
print(os.environ["MYVARIABLE"])

VBA to read the variable is Environ("MYVARIABLE")

I don't think they environment variable is saved once the python program is closed. If I were to do this I would use a workaround notepad txt file like below.  I really don't want to do this and want to find the simple solution to directly pass variables to and from pcdmis.  Not to mention I can't stand the vba syntax.

LOC1 = 0.100
LOC2 = 0.200

variables_path = r'C:\Users\user\Desktop\variables.txt'

# Write the values to a file
with open(variables_path, "w") as file:
    file.write(f"{LOC1}\n")
    file.write(f"{LOC2}\n")

# Read and print the values from the file
with open(variables_path, "r") as file:
    for line in file:
        print(line.strip())

The environment variable is not lost when the python script ends. It is part of the set of variables the windows OS uses. You just have to make sure the variable is named in a very very specific fashion. There are other ways to read them as well. Like I said I can't test it for your specific application.

I realized you are correct about that. I've found a way to do it that is to my liking at least.

My software has a built-in command: Clipboard.SetText / GetText

I'm sure you can figure out your favorite way to access the clipboard from PC-DMIS.

import subprocess

txt = subprocess.getoutput("powershell.exe -Command Get-Clipboard")
print(txt)

there are many other ways to access the clipboard in python: https://stackoverflow.com/questions/101128/how-do-i-read-text-from-the-windows-clipboard-in-python

Its not as sophisticated as I would like but saves you the trouble of having a million .txt files that your programs require 

I don't normally use python, so if I get some particular wrong, you'll have to excuse me. The reason it doesn't work is because you are treating an object as a string. The dmispart.GetVariableValue function returns an object of type variable. You have to define an object for that, e.g., dmisvar = dmispart.GetVariableValue("SHORTLOT"). Then you use that object's properties to get or set the value.

import win32com.client as w32

dmisapp = w32.Dispatch("PCDLRN.Application")
dmispart = dmisapp.ActivePartProgram
dmisvar = dmispart.GetVariableValue("SHORTLOT")

short_lot_value = dmisvar.StringValue
# OR
dmisvar.StringValue = "LOT-123456"

Dismas121 

Thanks for the reply. I'll give that a shot. in the coming weeks and report back how it is working. Here is the code I'm going to try to pass back a variable to PCDMIS from python.

import win32com.client as w32

# Connect to PCDMIS
dmisapp = w32.Dispatch('PCDLRN.Application')
dmispart = dmisapp.ActivePartProgram
dmisvar = dmispart.GetVariableValue("SHORTLOT")

dmisvar.StringValue = "LOT-123456"

dmispart.SetVariableValue("SHORTLOT", dmisvar.StringValue)

I think the SetVariableValue second argument has to be of an object type Variable. So, you'll have to leave off the ".StringValue" part of your argument and just pass "dmisvar". Setting the StringValue in line 8 is sufficient.