My goal is to get a list of strings in Python (2.7) from C# function, that returns a List of strings. Please look at the code below.
C# code is using UnmanagedExports package. The function I want to import:
using System;
using System.Collections.Generic;
using RGiesecke.DllExport;
using System.Runtime.InteropServices;
namespace GetInheritanceLib
{
public class Program
{
[DllExport("GetInheritanceSource", CallingConvention = System.Runtime.InteropServices.CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.BStr, SizeParamIndex = 1)]
public static List<string> GetInheritanceSource([MarshalAs(UnmanagedType.LPWStr)] string path)
{
List<string> inheritedFrom = new List<string>(); //some correct result of unknown length;
return inheritedFrom;
}
}
}
I tried to import it in Python:
import os
import ctypes
MyDLL = os.getcwd() + "\ConsoleApp3.dll"
my_dll_loaded = ctypes.cdll.LoadLibrary(MyDLL)
get_inheritance_source = my_dll_loaded.GetInheritanceSource
path = "c:\\dev\\py\\proj"
c_path = ctypes.c_char_p(path)
get_inheritance_source.restype = ctypes.POINTER(ctypes.POINTER(ctypes.c_char_p)) # is it a list of strings?
get_inheritance_source.argtypes = [ctypes.c_char_p] # is it a ctring?
res = get_inheritance_source(c_path) # I expect this is a list of strings, but
The error I get:
File "C:/.../c_sharp.py", line .., in <module>
res = get_inheritance_source(c_path)
WindowsError: [Error -532462766] Windows Error 0xE0434352
I am not sure any of this code is correct. Please help me to bring it all together. Thank you.
PyDotNet helped me to solve this problem.
Python code I use now:
import os
import dotnet
dotnet.add_assemblies(os.getcwd()) # a folder with DLLs
dotnet.load_assembly('ConsoleApp3')
import ConsoleApp3
from ConsoleApp3 import Program
path = "c:\\dev\\py\\proj"
res = Program.GetInheritanceSource(path)
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