Example exporting CPP class as DLL and importing in Unity C# as native plugin

There will be times when you want to run your C++ code inside Unity. So you will need to export the code into DLL format and then import it in Unity. This project is showing you an example of exporting a Student class written in C++, and import it in Unity C#.

Open Unity project TestImportCPPClass and press Play button or Ctrl+P. You will see the output is being printed in the console.

unity-output-console

Then take a look at TestImportCPPClass/Assets/TestImportCPPClass.cs to see how it is implemented. You will see quickly that it's just a bunch of function calls to the DLL files.

1. Open Visual Studio 2017 and create a new DLL project.

2. Copy content of file TestExportCPPClass.cpp from TestExportCPPClass/TestExportCPPClass/ directory.

   TestExportCPPClass.cpp

3. Go to Build -> Build solution, make sure the build is set to x64 to get a dll file ready for Unity project with x64 architecture. (Optional: You could also build x86 version too)

   dll-directory

4. Create a new Unity project.

5. Copy dll file from TestExportCPPClass/x64/Debug into Unity's Assets/Plugins/x86_64 directory.

6. Open Unity project and copy the C# script from TestImportCPPClass/Assets/ directory.

   TestImportCPPClass.cs

7. Create an empty GameObject in the scene and attach the script to it.

   unity-hierarchy

8. Press Play button to see the output in the console.

   unity-output-console

https://stackoverflow.com/questions/315051/using-a-class-defined-in-a-c-dll-in-c-sharp-code/315064#315064

https://github.com/wm4n/unity-cpp-lib

https://github.com/Meach/UnitySimpleNativeLibrary