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I have a C# piece that generates a DLL which I'm trying to invoke from Python. The C# prototype is as follow:

public Main(NationalInstruments.TestStand.Interop.API.SequenceContext sequenceContext){
    public void ShowFullOptions(out bool errorOccurred, out int errorCode, out String errorMsg) {
        [...]
    }
}

I followed this post which explains how to achieve to pass "out" parameters from python, without success since clr.Reference does not exist and throw me the error:

AttributeError: module 'clr' has no attribute 'Reference'

I have pythonnet installed, version 2.3.

My python code:

import clr

dll_path = R"thatDllPath.dll"
clr.AddReference(dll_path)

from Flamenco_Calibration_Interface import Main
import System

my_instance = Main(None)
v1 = clr.Reference[System.Boolean](False)
v2 = clr.Reference[System.Int64](1)
v3 = clr.Reference[System.String]("")

a = my_instance.ShowFullOptions(v1,v2,v3)

I have checked that the DLL path is good and I am able to successfully call the C# method if I overload "ShowFullOptions" with a version without any arguments. The main problem resides in that I have the "out" keyword in the C# method prototype.

How do you properly generate argument in python so they are accepted as "out" within C# ?

Any help much appreciated.

Improve this question
4
  • yes? what is the question? Commented Jun 4, 2020 at 12:03
  • python + net. you can give a try to: ironpython.net Commented Jun 4, 2020 at 12:04
  • A main function has to be compatible with the windows operating system and needs a parameter list Main(string[] args). arg[0] windows will assign the name of the program and the parameters are strings like in a command line. You can also pass data through standard input and standard output. Commented Jun 4, 2020 at 12:19
  • I cannot change the prototype since that C# piece was originally designed to be called from within TestStand (LabView world). Although the main prototype is not as you say I managed to call it using None as unique argument. Commented Jun 4, 2020 at 12:22
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