You can call functions from your C, C++, or C# plug-insA set of code created outside of Unity that creates functionality in Unity. There are two kinds of plug-ins you can use in Unity: Managed plug-ins (managed .NET assemblies created with tools like Visual Studio) and Native plug-ins (platform-specific native code libraries). More info
See in Glossary in your Unity projects.
Unity uses Emscripten to compile your sources into WebAssembly from C/C++/C# code, so you can write plug-ins in C/C++/C# code and call these functions from your Unity C# scriptsA piece of code that allows you to create your own Components, trigger game events, modify Component properties over time and respond to user input in any way you like. More info
See in Glossary.
To call functions from your JavaScript plug-ins instead, refer to Call JavaScript functions from Unity C# scripts.
To allow your Unity project to call functions from your C/C++/C# plug-in code, you need to import your plug-in into your Unity project.
Place your JavaScript plug-in files in any folder, such as Assets/JSPlugins
.
If you use C++ (.cpp) to implement the plug-in, you must declare the functions with C linkage (extern “C”
) to avoid name mangling issues.
The following code is an example C++ plug-in with simple functions that you can call in your Unity project.
#include <stdio.h>
extern "C" void Hello ()
{
printf("Hello, world!\n");
}
extern "C" int AddNumbers (int x, int y)
{
return x + y;
}
Note: Unity uses the Emscripten version 2.0.19 toolchain.
Use the following Unity C# code in your Unity project to call the C++ functions.
using UnityEngine;
using System.Runtime.InteropServices;
public class NewBehaviourScript : MonoBehaviour {
[DllImport("__Internal")]
private static extern void Hello();
[DllImport("__Internal")]
private static extern int AddNumbers(int x, int y);
void Start() {
Hello();
int result = AddNumbers(5, 7);
Debug.Log(result);
}
}
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thank you for helping to make the Unity documentation better!
Your feedback has been submitted as a ticket for our documentation team to review.
We are not able to reply to every ticket submitted.