托管代码中调用c++本地代码

c++本地动态连接库代码

 #pragma once
 #include "stdafx.h"

 #ifdef PERSON_EXPORTS
 #define PERSON_API __declspec(dllexport)
 #else
 #define PERSON_API __declspec(dllimport)
 #endif

 class PERSON_API CPerson
 {
 public:
     CPerson(LPCTSTR pszName, SYSTEMTIME birth);
     unsigned int getAge(void);

 private:
     TCHAR _name[];
     SYSTEMTIME _birth;
 };

 #ifdef __cplusplus
 extern "C"{
 #endif
     extern PERSON_API int nVal;
     PERSON_API int nFunc(void);
 #ifdef __cplusplus
 }
 #endif

Source　　

 // CPerson.cpp: 定义 DLL 应用程序的导出函数。
 //

 #include "stdafx.h"
 #include "CPerson.h"

 CPerson::CPerson(LPCTSTR pszName, SYSTEMTIME birth)
 {
     _birth = birth;
     if (pszName != nullptr)
         lstrcpy(_name, pszName);
 }

 unsigned int CPerson::getAge(void)
 {
     SYSTEMTIME st;
     GetSystemTime(&st);
     UINT age = st.wYear - _birth.wYear;
     if (_birth.wMonth > st.wMonth ||
         (_birth.wMonth == st.wMonth && _birth.wDay > st.wDay))
     {
         --age;
     }

     return age;
 }

 PERSON_API int nVal = ;
 PERSON_API int nFunc(void)
 {
     return ;
 }

c++/cli包装代码

 #pragma once
 #include "CPerson.h"

 using namespace System;

 namespace Adapter
 {
     public ref class Person
     {
     public:
         Person(String ^name, DateTime birth);
         virtual ~Person();

         property unsigned int Age
         {
             unsigned int get();
         }

         static int CallnVal();
         static int CallnFunc();

     private:
         Person(): _person(nullptr) { }
         CPerson *_person;
     };
 }

Source

 #include "stdafx.h"
 #include "Person.h"
 #include <vcclr.h>

 Adapter::Person::Person(String ^ name, DateTime birth)
 {
     SYSTEMTIME st = {  };
     st.wYear = birth.Year;
     st.wMonth = birth.Month;
     st.wDay = birth.Day;

     pin_ptr<const TCHAR> psz = PtrToStringChars(name);

     _person = new CPerson(psz, st);
 }

 Adapter::Person::~Person()
 {
     //System::Diagnostics::Debugger::Log(0, "Debug", "Person destructor.");
     if (_person != nullptr)
     {
         CPerson *ptmp = _person;
         _person = nullptr;
         delete ptmp;
     }
 }

 int Adapter::Person::CallnVal()
 {
     return nVal;
 }

 int Adapter::Person::CallnFunc()
 {
     return nFunc();
 }

 unsigned int Adapter::Person::Age::get()
 {
     return _person->getAge();
 }

经过验证使用Visual Studio 2017包含头文件<vcclr.h>会有报错，可以设置修改平台工具集来编译

通过CSharp调用

 using System;
 using Adapter;

 namespace ConsoleApp
 {
     class Program
     {
         static void Main(string[] args)
         {
             DateTime dt = DateTime.Now;
             dt = dt.AddYears(-);
             Person p1 = new Person("c++", dt);
             Console.WriteLine("调用本地c++ dll中的类: " + p1.Age);
             Console.WriteLine("调用本地c++ dll中的变量： " + Person.CallnVal());
             Console.WriteLine("调用本地c++ dll中的函数: " + Person.CallnFunc());

             Console.ReadLine();
         }
     }
 }

参考资料详情：

　　https://www.codeproject.com/Articles/35041/Mixing-NET-and-native-code

　　https://blog.csdn.net/ganzheyu/article/details/50154705