Import DLL File Into Python

Importing a custom dll built with C# into a python project and access the functions inside the dll with the help of pythonnet or open command prompt and type for installation

# install pythonnet
pip install pythonnet

Project Structure

• DLL file contains the C# solution
• The python solution using C# dll file

Dll File Code

namespace CalcProject
{
    public class calculate
    {
        /// accept two integer parameters a and b
        /// return sum of two numbers
        /// Add(3, 2) and return 5
        public int Add(int a, int b)
        {
            return a + b;
        }
    }
}

Installation

First download, install and configure python. Then use the package manager pip to install on.

• For create dll file of C#, first write C# code then run, after successfully run goto build folder of project file for collect dll file.

Task Requirments & Testing Environment

this project is developed using all new os, software and tools.

• Operating System : Windows10
• Software : Python3.11 and Visual Studio Code

Python Code

import clr


# add reference to the library/dll
clr.AddReference("dlls/CalcProject")


# from namespace name import class name
from CalcProject import calculate


# create object of the class
cls_obj = calculate()


# call the function with class object
# the function from dll that you want to access
result = cls_obj.Add(3, 4)

# output from dll file
print('Output from dll file:', result)   # 7
# normal python output
print(f'Output from python: {3 + 4 = }') # 3 + 4 = 7

Notes

The requirements.txt file, lists of all the python libraries that my "Import DLL File Into Python" depends on and installs those packages from the file:

pip install -r requirements.txt
# or
sudo pip install -r requirements.txt

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

For more or connect with me

                   

License

The MIT License (MIT)

Thank You for Visiting!

“Good code is about making things powerful yet readable”
— Md. Ariful Islam