C#调用C++非托管代码

C# 调用C++ 非托管代码

将C++代码打包为DLL文件

• 工具
  • Visual Studio 2019

创建C++ DLL 工程

一、定义宏(必须)

//SuperDLLS.h
// 符号视为是被导出的。
#ifdef SUPERDLLS_EXPORTS
#define SUPERDLLS_API __declspec(dllexport)
#else
#define SUPERDLLS_API __declspec(dllimport)
#endif

二、定义要导出的函数

//SuperDLLS.h
EXTERN_C SUPERDLLS_API int Add(int x, int y);

EXTERN_C SUPERDLLS_API float Sub(float x, float y);

EXTERN_C SUPERDLLS_API double Mul(double x, double y);

EXTERN_C SUPERDLLS_API long Division(long x, long y);

三、实现要导出的函数

//SuperDLLS.cpp
int Add(int x, int y)
{
	return x + y;
}

float Sub(float x, float y)
{
	return x - y;
}

double Mul(double x, double y)
{
	return x * y;
}

long Division(long x, long y)
{
	return x / y;
}

四、定义要导出的C++类（不能直接导出使用，需要使用一个类包装器）

创建并定义头文件（SuperDLLS.h）

//SuperDLLS.h
class  SuperDLLS {
public:
	SuperDLLS(void);
	int AddC(int x, int y);
	float SubC(float x, float y);
	double MulC(double x, double y);
	long DivisionC(long x, long y);
};

创建并定义CPP文件（SuperDLLS.cpp）

SuperDLLS::SuperDLLS()
{
	cout << "constructor new SuperDLLS" << endl;
}

int SuperDLLS::AddC(int x, int y)
{
	return x + y;
}

float SuperDLLS::SubC(float x, float y)
{
	return x - y;
}

double SuperDLLS::MulC(double x, double y)
{
	return x * y;
}

long SuperDLLS::DivisionC(long x, long y)
{
	return x / y;
}

五、将需要导出的类包装起来供外部调用

创建并定义头文件（SuperDLLSWrapper.h）

// SuperDLLSWrapper.h
#include "SuperDLLS.h"
namespace SuperDLLSWrapper {
	extern "C" SUPERDLLS_API int __stdcall AddC(int x, int y);
	extern "C" SUPERDLLS_API float __stdcall SubC(float x, float y);
	extern "C" SUPERDLLS_API double __stdcall MulC(double x, double y);
	extern "C" SUPERDLLS_API long __stdcall DivisionC(long x, long y);
}

创建并定义cpp文件（SuperDLLSWrapper.cpp）

#include "pch.h"
#include "SuperDLLSWrapper.h"
namespace SuperDLLSWrapper {
	SuperDLLS* csuperdll = new SuperDLLS();

	int  AddC(int n1, int n2) {
		return csuperdll->AddC(n1, n2);
	}
	float  SubC(float n1, float n2) {
		return csuperdll->SubC(n1, n2);
	}
	double  MulC(double n1, double n2) {
		return csuperdll->MulC(n1, n2);
	}
	long  DivisionC(long n1, long n2) {
		return csuperdll->DivisionC(n1, n2);
	}
}

六、生成时，请根据自己的调用平台的架构打包DLL,否者识别不了（x64请打x64 DLL,x86 请打x86 DLL）

创建C#端测试代码

一、创建一个控制台应用程序，并将上一步生成的DLL 拷贝至当前目录下

• 使用工具
  • Visual Studio Code
• C# 版本
  • .Net Core 3.1

二、创建一个链接类，用于读取DLL中的函数信息

创建并定义SampleClassWrapper.cs类如下

using System;
using System.Runtime.InteropServices;
public static class SampleClassWrapper
{
    [DllImport(@"SUPERDLLS.dll")]
    public static extern int Add(int n1, int n2);

    [DllImport(@"SUPERDLLS.dll")]
    public static extern float Sub(float n1, float n2);

    [DllImport(@"SUPERDLLS.dll")]
    public static extern double Mul(double x, double y);
    [DllImport(@"SUPERDLLS.dll")]
    public static extern long Division(long n1, long n2);

    [DllImport(@"SUPERDLLS.dll")]
    public static extern int AddC(int n1, int n2);
    [DllImport(@"SUPERDLLS.dll")]
    public static extern float SubC(float n1, float n2);

    [DllImport(@"SUPERDLLS.dll")]
    public static extern double MulC(double n1, double n2);

    [DllImport(@"SUPERDLLS.dll")]
    public static extern long DivisionC(long n1, long n2);
}

测试代码如下：

using System;
using System.Reflection;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Runtime.Serialization.Formatters.Binary;

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(SampleClassWrapper.Add(10000, 2));
            Console.WriteLine(SampleClassWrapper.Sub(1.29544f, 2.43358874f));
            Console.WriteLine(SampleClassWrapper.Mul(12.0005, 59.98775));
            Console.WriteLine(SampleClassWrapper.Division(336644, 3355555555));


            Console.WriteLine(SampleClassWrapper.AddC(10000, 2));
            Console.WriteLine(SampleClassWrapper.SubC(1.29544f, 2.43358874f));
            Console.WriteLine(SampleClassWrapper.MulC(12.0005, 59.98775));
            Console.WriteLine(SampleClassWrapper.DivisionC(336644, 3355555555));
        }
    }

输出代码如下：

Demo地址： https://gitee.com/Sun_ME/CSharp_Invoke_Cplusplus_DLL.git

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