Unity 动态库回调

C dyna.c文件编译 CBDyna.dll

#ifndef __CBD__
#define CBDyna __declspec(dllexport)
#else
#define CBDyna __declspec(dllimport)
#endif // !__CBD__

CBDyna void ExecuteRepeat(int (*callback)(int)) {
	int i = 0;
	for (;;) {
		i++;
		int _out = callback(i);
		if (_out > 10000)
			break;
	}
}

Unity C# 调用

using UnityEngine;
using System.Runtime.InteropServices;
public class TestDll : MonoBehaviour
{
    public delegate int RepeatEvt(int c);
    

    int AskMore(int x)
    {
        int _rst = 2 * x;
        Debug.Log("input " + x + ",output " + _rst);
        return _rst;
    }
    // Start is called before the first frame update
    void Start()
    {
        RepeatEvt _p = AskMore;
        ExecuteRepeat(_p);
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    [DllImport("CBDyna")]//, true, CallingConvention.Cdecl, CharSet.Ansi, "ExecuteRepeat",true,true,true,true)]
    extern static void ExecuteRepeat(RepeatEvt _cb);
}