用JNA和DLLExport实现Java到C#的结构数组传递

import com.sun.jna.Library;
import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;

public class Main {
    public interface MyDll extends Library {
        MyDll INSTANCE = Native.loadLibrary("mydll", MyDll.class);

        void passStructArray(MyStruct.ByReference array, int size);
    }

    public static class MyStruct extends Structure {
        public static class ByReference extends MyStruct implements Structure.ByReference {
        }

        public int id;
        public String name;

        protected ByReference newInstance() {
            return new ByReference();
        }

        protected List<String> getFieldOrder() {
            return Arrays.asList("id", "name");
        }
    }

    public static void main(String[] args) {
        MyStruct.ByReference array = new MyStruct.ByReference();
        array.id = 1;
        array.name = "John";

        MyDll.INSTANCE.passStructArray(array, 1);
    }
}

using System;
using System.Runtime.InteropServices;

public class MyDll
{
    public struct MyStruct
    {
        public int id;
        [MarshalAs(UnmanagedType.LPStr)]
        public string name;
    }

    [DllExport("passStructArray", CallingConvention = CallingConvention.Cdecl)]
    public static void PassStructArray(IntPtr array, int size)
    {
        MyStruct[] structs = new MyStruct[size];
        int structSize = Marshal.SizeOf(typeof(MyStruct));

        for (int i = 0; i < size; i++)
        {
            IntPtr structPtr = new IntPtr(array.ToInt64() + i * structSize);
            structs[i] = (MyStruct)Marshal.PtrToStructure(structPtr, typeof(MyStruct));
        }

        // Process the struct array
        // ...

        // Modify the struct array if needed
        // ...

        // Copy the modified struct array back to memory
        for (int i = 0; i < size; i++)
        {
            IntPtr structPtr = new IntPtr(array.ToInt64() + i * structSize);
            Marshal.StructureToPtr(structs[i], structPtr, false);
        }
    }
}