C#调用C/C++动态库

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前言

在项目开发中经常会遇到C/C++的动态链接库，而上位机采用C#的方式进行开发。对于某些应用不适用直接使用非托管的方式调用C/C++中的接口，本文就介绍在C#中采用中间层调用C++动态库，并将其封装成C#的库文件，将符合C#的库文件用于发布使用。

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一、创建C/C++动态库

1.新建工程

2.添加模拟测试驱动

#include "stdafx.h"
#include "board_driver.h"

#define DEFAULT_HANDLE	0x2000

int board_open(unsigned int* handle)
{
	*handle = DEFAULT_HANDLE;
	return 0;
}

int board_close(unsigned int handle)
{
	return handle;
}

int board_calc(int a, int b)
{
	return a + b;
}

2.头文件声明

#ifndef __BOARD_DRIVER_H
#define __BOARD_DRIVER_H

int board_open(unsigned int* handle);
int board_close(unsigned int handle);
int board_calc(int a, int b);

#endif

3.模块定义声明

模块声明需要导出的函数。

LIBRARY	"board_driver"
EXPORTS
	board_open @1
	board_close @2
	board_calc @3

4.编译生成库文件

选择重新生成；

二、创建C#库

1.新建工程

在同一解决方案下新建C#库工程。

2.添加源码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;

namespace CBoardDriver
{
    public class BoardDriver
    {
        [DllImport("board_driver.dll", EntryPoint = "board_open", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
        public static extern int board_open(ref UInt32 handle);

        [DllImport("board_driver.dll", EntryPoint = "board_close", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
        public static extern int board_close(UInt32 handle);

        [DllImport("board_driver.dll", EntryPoint = "board_calc", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl)]
        public static extern int board_calc(int a,int b);

        /// 

        /// 重写接口
        /// 
        /// 
        /// 
        public int BoardOpen(ref UInt32 handle)
        {
            return board_open(ref handle);
        }


        /// 

        /// 重写接口
        /// 
        /// 
        /// 
        public int BoardClose(UInt32 handle)
        {
            return board_close(handle);
        }


        /// 

        /// 重写接口
        /// 
        /// 
        /// 
        public int BoardCalc(int a,int b)
        {
            return board_calc(a, b);
        }
    }
}

3.编译生成库文件

三、应用测试

1.新建WinForm工程

2.引用库

3.应用测试

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

namespace CBoardTest
{
    public partial class Form1 : Form
    {
        /// 

        /// 
        /// 
        BoardDriver boardDriver;

        /// 

        /// 
        /// 
        UInt32 handle;

        public Form1()
        {
            InitializeComponent();
            //
            handle = 0;
            //实例
            boardDriver = new BoardDriver();
        }

        private void button1_Click(object sender, EventArgs e)
        {
           
            boardDriver.BoardOpen(ref handle);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            int status = 0;
            status = boardDriver.BoardClose(handle);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            int result = 0;
            result = boardDriver.BoardCalc(4, 5);
        }
    }
}

4.设置运行

设置测试工程为启动项目；

将C/C++库拷贝到可执行程序路径；

5.测试

在Open中读取到在C/C++库中设置的默认值；

在Calc中实现两数相加；

总结

以上就是本次记录的内容，本文仅仅简单介绍了C#采用中间件调用C/C++库的实现流程；