四月的筆記

 

1.在 DLL這裡做修改

MyDLL.h

#pragma once

#ifdef MYDLL_EXPORTS
#define MYDLL_API __declspec(dllexport)
#else
#define MYDLL_API __declspec(dllimport)
#endif

using namespace std;

class MYDLL_API ADD_Control {
public:

    ADD_Control();
    int Add_test(int i,int j);

    int ADD_ID = 0;

private:
    
    

};

 

拉出一個指標，用指標來接收訊息
直接加入一個CLASS的 new 跟 Delet 來建立跟刪除

MyDLL.cpp

#include "pch.h"
#include <cmath>
#include <iostream>
#include "MyDLL.h"

ADD_Control::ADD_Control()
{
    std::cout << "Hello ADD";
}

int ADD_Control::Add_test(int i, int j)
{
    return i + j;
}

//////////////////////////////////////////////////////

extern "C" MYDLL_API ADD_Control *ADD_Ptr_Csharp = NULL;

extern "C" MYDLL_API ADD_Control * Create_Class();
extern ADD_Control* Create_Class()
{
    return new ADD_Control();
}

extern "C" MYDLL_API ADD_Control * Delete_Class(ADD_Control * ADD_Csharp);
extern ADD_Control* Delete_Class(ADD_Control* ADD_Csharp)
{
    delete ADD_Csharp;
    ADD_Csharp = NULL;
    return ADD_Csharp;
}

extern "C" MYDLL_API int ADD_test1(ADD_Control * ADD_Csharp, int i, int j);
extern int ADD_test1(ADD_Control* ADD_Csharp, int i, int j)
{
    return ADD_Csharp->Add_test(i, j);
}

extern "C" MYDLL_API int ADD_test2(ADD_Control * ADD_Csharp);
extern int ADD_test2(ADD_Control* ADD_Csharp)
{
    ADD_Csharp->ADD_ID = 5;
    return ADD_Csharp->ADD_ID;
}

 

2. 最後一樣用PInvoke去接，但是要用指標去接Class

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;


namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            m_ADD_ptr = Create_Class();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            m_ADD_ptr = Delete_Class(m_ADD_ptr);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            button3.Text = ADD_test1(m_ADD_ptr, 1, 2).ToString();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            button4.Text = ADD_test2(m_ADD_ptr).ToString();
        }
    }
}


namespace WindowsFormsApp1
{
    public partial class Form1 
    {


        private IntPtr m_ADD_ptr;

        [DllImport("MyDLL.dll", EntryPoint = "Create_Class", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr Create_Class();

        [DllImport("MyDLL.dll", EntryPoint = "Delete_Class", CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr Delete_Class(IntPtr ADD_ptr);

        [DllImport("MyDLL.dll", EntryPoint = "ADD_test1", CallingConvention = CallingConvention.Cdecl)]
        private static extern int ADD_test1(IntPtr ADD_ptr, int i, int j);

        [DllImport("MyDLL.dll", EntryPoint = "ADD_test2", CallingConvention = CallingConvention.Cdecl)]
        private static extern int ADD_test2(IntPtr ADD_ptr);


    }
}