在c#中从c++函数返回数组和结构

// 定义一个结构
struct MyStruct {
    int value1;
    float value2;
};

// 定义一个返回结构的函数
extern "C" __declspec(dllexport) MyStruct GetStruct() {
    MyStruct myStruct;
    myStruct.value1 = 10;
    myStruct.value2 = 3.14f;
    return myStruct;
}

// 定义一个返回数组的函数
extern "C" __declspec(dllexport) int* GetArray(int size) {
    int* array = new int[size];
    for (int i = 0; i < size; i++) {
        array[i] = i;
    }
    return array;
}

using System;
using System.Runtime.InteropServices;

public class Program {
    // 导入C++函数
    [DllImport("YourCppLibrary.dll")]
    public static extern MyStruct GetStruct();

    [DllImport("YourCppLibrary.dll")]
    public static extern IntPtr GetArray(int size);

    // 定义结构
    [StructLayout(LayoutKind.Sequential)]
    public struct MyStruct {
        public int value1;
        public float value2;
    }

    public static void Main() {
        // 调用C++函数返回结构
        MyStruct myStruct = GetStruct();
        Console.WriteLine("Value1: " + myStruct.value1);
        Console.WriteLine("Value2: " + myStruct.value2);

        // 调用C++函数返回数组
        int size = 5;
        IntPtr arrayPtr = GetArray(size);
        int[] array = new int[size];
        Marshal.Copy(arrayPtr, array, 0, size);
        Console.WriteLine("Array: " + string.Join(", ", array));

        // 释放内存
        Marshal.FreeCoTaskMem(arrayPtr);
    }
}